EC

ENGINE CONTROL SYSTEM

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B ENGINE

EC A

SECTION

EC

ENGINE CONTROL SYSTEM C

D

CONTENTS

E

QG18DE

POSITIVE CRANKCASE VENTILATION ................ 48 F

Description ............................................................. 48

INDEX FOR DTC ..................................................... 14

Component Inspection ........................................... 48

DTC No. Index ...................................................... 14 Alphabetical Index ................................................. 17

NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEMNATS) ....................................................................... 50

G

PRECAUTIONS ....................................................... 20

Description ............................................................. 50

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-

ON BOARD DIAGNOSTIC (OBD) SYSTEM ........... 51 Introduction ............................................................ 51

H

SIONER" ............................................................... 20

Two Trip Detection Logic ....................................... 51

On Board Diagnostic (OBD) System of Engine and

Emission-related Diagnostic Information ............... 52

A/T ......................................................................... 20

Malfunction Indicator Lamp (MIL) .......................... 64 I

Precaution ............................................................. 20

OBD System Operation Chart ............................... 67

PREPARATION ........................................................ 24 BASIC SERVICE PROCEDURE .............................. 73

Special Service Tools ............................................ 24

Basic Inspection .................................................... 73 J

Commercial Service Tools ..................................... 25

Idle Speed and Ignition Timing Check ................... 78

ENGINE CONTROL SYSTEM ................................. 26

VIN Registration .................................................... 79

System Diagram .................................................... 26 Multiport Fuel Injection (MFI) System ................... 27

Accelerator Pedal Released Position Learning ..... 79 K Throttle Valve Closed Position Learning ................ 80

Electronic Ignition (EI) System .............................. 29

Idle Air Volume Learning ....................................... 80

Fuel Cut Control (at No Load and High Engine

Fuel Pressure Check ............................................. 82

Speed) ................................................................... 30 TROUBLE DIAGNOSIS ........................................... 85 L

AIR CONDITIONING CUT CONTROL .................... 31

Trouble Diagnosis Introduction .............................. 85

Input/output Signal Chart ...................................... 31

DTC Inspection Priority Chart ................................ 91

System Description ............................................... 31

Fail-safe Chart ....................................................... 93 M

AUTOMATIC SPEED CONTROL DEVICE (ASCD)... 32

Symptom Matrix Chart ........................................... 94

System Description ............................................... 32

Engine Control Component Parts Location ........... 98

Component Description ......................................... 33

Vacuum Hose Drawing ........................................ 104

CAN COMMUNICATION ......................................... 34

Circuit Diagram .................................................... 105

System Description ............................................... 34

ECM Harness Connector Terminal Layout .......... 107

EVAPORATIVE EMISSION SYSTEM ...................... 35

ECM Terminals and Reference Value .................. 107

Description ............................................................ 35

CONSULT-II Function (ENGINE) ......................... 115

Component Inspection .......................................... 38

Generic Scan Tool (GST) Function ...................... 127

Removal and Installation ....................................... 39

CONSULT-II Reference Value in Data Monitor .... 129

How to Detect Fuel Vapor Leakage ...................... 39

Major Sensor Reference Graph in Data Monitor

ON BOARD REFUELING VAPOR RECOVERY

Mode .................................................................... 132

(ORVR) ..................................................................... 42 TROUBLE DIAGNOSIS - SPECIFICATION VALUE. 134

System Description ............................................... 42

Description ........................................................... 134

Diagnostic Procedure ............................................ 43

Testing Condition ................................................. 134

Component Inspection .......................................... 46

Inspection Procedure ........................................... 134

Diagnostic Procedure .......................................... 135

Revision: December 2006

EC-1

2006 Sentra

TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ...................................................................... 144
Description ........................................................... 144 Diagnostic Procedure .......................................... 144 POWER SUPPLY AND GROUND CIRCUIT .......... 145 Wiring Diagram .................................................... 145 Diagnostic Procedure .......................................... 146 Component Inspection ......................................... 151 Ground Inspection ............................................... 151 DTC U1000, U1001 CAN COMMUNICATION LINE. 152 Description ........................................................... 152 On Board Diagnosis Logic ................................... 152 DTC Confirmation Procedure .............................. 152 Wiring Diagram .................................................... 153 Diagnostic Procedure .......................................... 154 DTC U1010 CAN COMMUNICATION .................... 155 Description ........................................................... 155 On Board Diagnosis Logic ................................... 155 DTC Confirmation Procedure .............................. 155 Diagnostic Procedure .......................................... 156 DTC P0011 IVT CONTROL .................................... 157 Description ........................................................... 157 CONSULT-IIReference Valuein DataMonitorMode
. 157 On Board Diagnosis Logic ................................... 158 DTC Confirmation Procedure .............................. 158 Diagnostic Procedure .......................................... 159 Component Inspection ......................................... 160 Removal and Installation ..................................... 160 DTC P0031, P0032 A/F SENSOR 1 HEATER ....... 161 Description ........................................................... 161 CONSULT-IIReference Valuein DataMonitorMode
. 161 On Board Diagnosis Logic ................................... 161 DTC Confirmation Procedure .............................. 161 Wiring Diagram .................................................... 162 Diagnostic Procedure .......................................... 163 Component Inspection ......................................... 165 Removal and Installation ..................................... 165 DTC P0037, P0038 HO2S2 HEATER .................... 166 Description ........................................................... 166 CONSULT-IIReference Valuein DataMonitorMode
. 166 On Board Diagnosis Logic ................................... 166 DTC Confirmation Procedure .............................. 167 Wiring Diagram .................................................... 168 Diagnostic Procedure .......................................... 169 Component Inspection ......................................... 171 Removal and Installation ..................................... 171 DTC P0075 IVT CONTROL SOLENOID VALVE ... 172 Description ........................................................... 172 CONSULT-IIReference Valuein DataMonitorMode
. 172 On Board Diagnosis Logic ................................... 172 DTC Confirmation Procedure .............................. 172 Wiring Diagram .................................................... 173 Diagnostic Procedure .......................................... 175 Component Inspection ......................................... 176 Removal and Installation ..................................... 176

DTC P0101 MAF SENSOR ....................................177 Component Description .......................................177 CONSULT-IIReferenceValue inData MonitorMode .177 On Board Diagnosis Logic ...................................177 DTC Confirmation Procedure ...............................178 Overall Function Check ........................................179 Wiring Diagram ....................................................180 Diagnostic Procedure ...........................................181 Component Inspection .........................................184
DTC P0102, P0103 MAF SENSOR ........................186 Component Description .......................................186 CONSULT-IIReferenceValue inData MonitorMode .186 On Board Diagnosis Logic ...................................186 DTC Confirmation Procedure ...............................187 Wiring Diagram ....................................................188 Diagnostic Procedure ...........................................189 Component Inspection .........................................192
DTC P0112, P0113 IAT SENSOR ...........................194 Component Description .......................................194 On Board Diagnosis Logic ...................................194 DTC Confirmation Procedure ...............................194 Wiring Diagram ....................................................195 Diagnostic Procedure ...........................................196 Component Inspection .........................................197
DTC P0117, P0118 ECT SENSOR .........................199 Component Description .......................................199 On Board Diagnosis Logic ...................................199 DTC Confirmation Procedure ...............................200 Wiring Diagram ....................................................201 Diagnostic Procedure ...........................................202 Component Inspection .........................................203 Removal and Installation ......................................204
DTC P0122, P0123 TP SENSOR ...........................205 Component Description .......................................205 CONSULT-IIReferenceValue inData MonitorMode .205 On Board Diagnosis Logic ...................................205 DTC Confirmation Procedure ...............................206 Wiring Diagram ....................................................207 Diagnostic Procedure ...........................................208 Component Inspection ......................................... 211 Removal and Installation ...................................... 211
DTC P0125 ECT SENSOR .....................................212 Component Description .......................................212 On Board Diagnosis Logic ...................................212 DTC Confirmation Procedure ...............................213 Diagnostic Procedure ...........................................213 Component Inspection .........................................214 Removal and Installation ......................................214
DTC P0127 IAT SENSOR .......................................215 Component Description .......................................215 On Board Diagnosis Logic ...................................215 DTC Confirmation Procedure ...............................215 Diagnostic Procedure ...........................................216 Component Inspection .........................................217
DTC P0128 THERMOSTAT FUNCTION ................218 On Board Diagnosis Logic ...................................218

Revision: December 2006

EC-2

2006 Sentra

DTC Confirmation Procedure .............................. 218 Diagnostic Procedure .......................................... 218 Component Inspection ........................................ 219 Removal and Installation ..................................... 219 DTC P0130 A/F SENSOR 1 .................................. 220 Component Description ....................................... 220 CONSULT-II Reference Value in Data Monitor Mode
. 220 On Board Diagnosis Logic .................................. 220 DTC Confirmation Procedure .............................. 220 Overall Function Check ....................................... 221 Wiring Diagram ................................................... 223 Diagnostic Procedure .......................................... 224 Removal and Installation ..................................... 226 DTC P0131 A/F SENSOR 1 .................................. 227 Component Description ....................................... 227 CONSULT-II Reference Value in Data Monitor Mode
. 227 On Board Diagnosis Logic .................................. 227 DTC Confirmation Procedure .............................. 227 Overall Function Check ....................................... 228 Wiring Diagram ................................................... 230 Diagnostic Procedure .......................................... 231 Removal and Installation ..................................... 233 DTC P0132 A/F SENSOR 1 .................................. 234 Component Description ....................................... 234 CONSULT-II Reference Value in Data Monitor Mode
. 234 On Board Diagnosis Logic .................................. 234 DTC Confirmation Procedure .............................. 234 Overall Function Check ....................................... 235 Wiring Diagram ................................................... 237 Diagnostic Procedure .......................................... 238 Removal and Installation ..................................... 240 DTC P0133 A/F SENSOR 1 .................................. 241 Component Description ....................................... 241 CONSULT-II Reference Value in Data Monitor Mode
. 241 On Board Diagnosis Logic .................................. 241 DTC Confirmation Procedure .............................. 242 Overall Function Check ....................................... 242 Wiring Diagram ................................................... 244 Diagnostic Procedure .......................................... 245 Removal and Installation ..................................... 250 DTC P0137 HO2S2 ................................................ 251 Component Description ....................................... 251 CONSULT-II Reference Value in Data Monitor Mode
. 251 On Board Diagnosis Logic .................................. 251 DTC Confirmation Procedure .............................. 252 Overall Function Check ....................................... 252 Wiring Diagram ................................................... 254 Diagnostic Procedure .......................................... 255 Component Inspection ........................................ 257 Removal and Installation ..................................... 258 DTC P0138 HO2S2 ................................................ 259 Component Description ....................................... 259 CONSULT-II Reference Value in Data Monitor Mode
. 259

On Board Diagnosis Logic ................................... 259 DTC Confirmation Procedure .............................. 260 A Overall Function Check ....................................... 261 Wiring Diagram .................................................... 262 Diagnostic Procedure .......................................... 263 EC Component Inspection ......................................... 266 Removal and Installation ..................................... 268 DTC P0139 HO2S2 ................................................ 269 Component Description ....................................... 269 C CONSULT-IIReferenceValuein DataMonitorMode
. 269 On Board Diagnosis Logic ................................... 269 D DTC Confirmation Procedure .............................. 270 Overall Function Check ....................................... 270 Wiring Diagram .................................................... 272 E Diagnostic Procedure .......................................... 273 Component Inspection ......................................... 275 Removal and Installation ..................................... 276 DTCP0171 FUELINJECTIONSYSTEMFUNCTION. 277 F On Board Diagnosis Logic ................................... 277 DTC Confirmation Procedure .............................. 277 Wiring Diagram .................................................... 279 G Diagnostic Procedure .......................................... 281 DTCP0172 FUELINJECTIONSYSTEMFUNCTION. 285 On Board Diagnosis Logic ................................... 285 H DTC Confirmation Procedure .............................. 285 Wiring Diagram .................................................... 287 Diagnostic Procedure .......................................... 289 DTC P0181 FTT SENSOR ..................................... 293 I Component Description ....................................... 293 On Board Diagnosis Logic ................................... 293 DTC Confirmation Procedure .............................. 293 J Wiring Diagram .................................................... 295 Diagnostic Procedure .......................................... 296 Component Inspection ......................................... 297 K Removal and Installation ..................................... 297 DTC P0182, P0183 FTT SENSOR ......................... 298 Component Description ....................................... 298 L On Board Diagnosis Logic ................................... 298 DTC Confirmation Procedure .............................. 298 Wiring Diagram .................................................... 299 Diagnostic Procedure .......................................... 300 M Component Inspection ......................................... 301 Removal and Installation ..................................... 301 DTC P0222, P0223 TP SENSOR ........................... 302 Component Description ....................................... 302 CONSULT-IIReferenceValuein DataMonitorMode
. 302 On Board Diagnosis Logic ................................... 302 DTC Confirmation Procedure .............................. 303 Wiring Diagram .................................................... 304 Diagnostic Procedure .......................................... 305 Component Inspection ......................................... 308 Removal and Installation ..................................... 308 DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MISFIRE .................... 309 On Board Diagnosis Logic ................................... 309 DTC Confirmation Procedure .............................. 310 Diagnostic Procedure .......................................... 310

Revision: December 2006

EC-3

2006 Sentra

DTC P0327, P0328 KS ........................................... 316 Component Description ....................................... 316 On Board Diagnosis Logic ................................... 316 DTC Confirmation Procedure .............................. 316 Wiring Diagram .................................................... 317 Diagnostic Procedure .......................................... 318 Component Inspection ......................................... 319 Removal and Installation ..................................... 320
DTC P0335 CKP SENSOR (POS) ......................... 321 Component Description ....................................... 321 CONSULT-IIReference Valuein DataMonitorMode . 321 On Board Diagnosis Logic ................................... 321 DTC Confirmation Procedure .............................. 322 Wiring Diagram .................................................... 323 Diagnostic Procedure .......................................... 324 Component Inspection ......................................... 326 Removal and Installation ..................................... 327
DTC P0340 CMP SENSOR (PHASE) .................... 328 Component Description ....................................... 328 On Board Diagnosis Logic ................................... 328 DTC Confirmation Procedure .............................. 329 Wiring Diagram .................................................... 330 Diagnostic Procedure .......................................... 331 Component Inspection ......................................... 334 Removal and Installation ..................................... 334
DTC P0420 THREE WAY CATALYST FUNCTION . 335 On Board Diagnosis Logic ................................... 335 DTC Confirmation Procedure .............................. 335 Overall Function Check ....................................... 336 Diagnostic Procedure .......................................... 337
DTC P0441 EVAP CONTROL SYSTEM ................ 340 System Description .............................................. 340 On Board Diagnosis Logic ................................... 340 DTC Confirmation Procedure .............................. 341 Overall Function Check ....................................... 341 Diagnostic Procedure .......................................... 342
DTC P0442 EVAP CONTROL SYSTEM ................ 346 On Board Diagnosis Logic ................................... 346 DTC Confirmation Procedure .............................. 347 Diagnostic Procedure .......................................... 348
DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE .............................. 354
Description ........................................................... 354 CONSULT-IIReference Valuein DataMonitorMode
. 354 On Board Diagnosis Logic ................................... 355 DTC Confirmation Procedure .............................. 355 Wiring Diagram .................................................... 356 Diagnostic Procedure .......................................... 358 Component Inspection ......................................... 361 Removal and Installation ..................................... 361 DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE ..................... 362 Description ........................................................... 362 CONSULT-IIReference Valuein DataMonitorMode
. 362 On Board Diagnosis Logic ................................... 363 DTC Confirmation Procedure .............................. 363

Wiring Diagram ....................................................364 Diagnostic Procedure ...........................................366 Component Inspection .........................................367 Removal and Installation ......................................368 DTC P0447 EVAP CANISTER VENT CONTROL VALVE .....................................................................369 Component Description .......................................369 CONSULT-IIReferenceValue inData MonitorMode
.369 On Board Diagnosis Logic ...................................369 DTC Confirmation Procedure ...............................370 Wiring Diagram ....................................................371 Diagnostic Procedure ...........................................372 Component Inspection .........................................374 DTC P0448 EVAP CANISTER VENT CONTROL VALVE .....................................................................376 Component Description .......................................376 CONSULT-IIReferenceValue inData MonitorMode
.376 On Board Diagnosis Logic ...................................376 DTC Confirmation Procedure ...............................377 Wiring Diagram ....................................................379 Diagnostic Procedure ...........................................380 Component Inspection .........................................382 DTC P0451 EVAPCONTROLSYSTEMPRESSURE SENSOR .................................................................384 Component Description .......................................384 CONSULT-IIReferenceValue inData MonitorMode
.384 On Board Diagnosis Logic ...................................384 DTC Confirmation Procedure ...............................384 Diagnostic Procedure ...........................................385 Component Inspection .........................................386 DTC P0452 EVAPCONTROLSYSTEMPRESSURE SENSOR .................................................................387 Component Description .......................................387 CONSULT-IIReferenceValue inData MonitorMode
.387 On Board Diagnosis Logic ...................................387 DTC Confirmation Procedure ...............................388 Wiring Diagram ....................................................389 Diagnostic Procedure ...........................................390 Component Inspection .........................................392 DTC P0453 EVAPCONTROLSYSTEMPRESSURE SENSOR .................................................................393 Component Description .......................................393 CONSULT-IIReferenceValue inData MonitorMode
.393 On Board Diagnosis Logic ...................................393 DTC Confirmation Procedure ...............................394 Wiring Diagram ....................................................395 Diagnostic Procedure ...........................................396 Component Inspection .........................................399 DTC P0455 EVAP CONTROL SYSTEM ................400 On Board Diagnosis Logic ...................................400 DTC Confirmation Procedure ...............................401 Diagnostic Procedure ...........................................402 DTC P0456 EVAP CONTROL SYSTEM ................407 On Board Diagnosis Logic ...................................407

Revision: December 2006

EC-4

2006 Sentra

DTC Confirmation Procedure .............................. 408 Overall Function Check ....................................... 409 Diagnostic Procedure .......................................... 410 DTC P0460 FUEL LEVEL SENSOR ..................... 416 Component Description ....................................... 416 On Board Diagnostic Logic ................................. 416 DTC Confirmation Procedure .............................. 416 Diagnostic Procedure .......................................... 417 Removal and Installation ..................................... 417 DTC P0461 FUEL LEVEL SENSOR ..................... 418 Component Description ....................................... 418 On Board Diagnostic Logic ................................. 418 Overall Function Check ....................................... 418 Diagnostic Procedure .......................................... 419 Removal and Installation ..................................... 419 DTC P0462, P0463 FUEL LEVEL SENSOR ......... 420 Component Description ....................................... 420 On Board Diagnostic Logic ................................. 420 DTC Confirmation Procedure .............................. 420 Diagnostic Procedure .......................................... 421 Removal and Installation ..................................... 421 DTC P0500 VSS .................................................... 422 Component Description ....................................... 422 On Board Diagnosis Logic .................................. 422 DTC Confirmation Procedure .............................. 422 Overall Function Check ....................................... 422 Diagnostic Procedure .......................................... 423 DTC P0506 ISC SYSTEM ...................................... 424 Description .......................................................... 424 On Board Diagnosis Logic .................................. 424 DTC Confirmation Procedure .............................. 424 Diagnostic Procedure .......................................... 425 DTC P0507 ISC SYSTEM ...................................... 426 Description .......................................................... 426 On Board Diagnosis Logic .................................. 426 DTC Confirmation Procedure .............................. 426 Diagnostic Procedure .......................................... 427 DTC P0550 PSP SENSOR .................................... 428 Component Description ....................................... 428 CONSULT-II Reference Value in Data Monitor Mode
. 428 On Board Diagnosis Logic .................................. 428 DTC Confirmation Procedure .............................. 428 Wiring Diagram ................................................... 429 Diagnostic Procedure .......................................... 430 Component Inspection ........................................ 432 DTC P0603 ECM POWER SUPPLY ...................... 433 Component Description ....................................... 433 On Board Diagnosis Logic .................................. 433 DTC Confirmation Procedure .............................. 433 Wiring Diagram ................................................... 434 Diagnostic Procedure .......................................... 435 DTC P0605 ECM ................................................... 437 Component Description ....................................... 437 On Board Diagnosis Logic .................................. 437 DTC Confirmation Procedure .............................. 437 Diagnostic Procedure .......................................... 438 DTC P0643 SENSOR POWER SUPPLY ............... 440 On Board Diagnosis Logic .................................. 440

DTC Confirmation Procedure .............................. 440 Wiring Diagram .................................................... 441 A Diagnostic Procedure .......................................... 443 DTC P0850 PNP SWITCH ..................................... 445 Component Description ....................................... 445 EC CONSULT-IIReferenceValuein DataMonitorMode
. 445 On Board Diagnosis Logic ................................... 445 DTC Confirmation Procedure .............................. 445 C Overall Function Check ....................................... 446 Wiring Diagram .................................................... 447 Diagnostic Procedure .......................................... 448 D DTC P1148 CLOSED LOOP CONTROL ............... 449 On Board Diagnosis Logic ................................... 449 DTC P1217 ENGINE OVER TEMPERATURE ....... 450 E System Description .............................................. 450 CONSULT-IIReferenceValuein DataMonitorMode
. 451 On Board Diagnosis Logic ................................... 451 F Overall Function Check ....................................... 451 Wiring Diagram .................................................... 454 Diagnostic Procedure .......................................... 455 G Main 12 Causes of Overheating .......................... 461 Component Inspection ......................................... 462 DTC P1225 TP SENSOR ....................................... 464 H Component Description ....................................... 464 On Board Diagnosis Logic ................................... 464 DTC Confirmation Procedure .............................. 464 Diagnostic Procedure .......................................... 465 I Removal and Installation ..................................... 465 DTC P1226 TP SENSOR ....................................... 466 Component Description ....................................... 466 J On Board Diagnosis Logic ................................... 466 DTC Confirmation Procedure .............................. 466 Diagnostic Procedure .......................................... 467 K Removal and Installation ..................................... 467 DTC P1564 ASCD STEERING SWITCH ............... 468 Component Description ....................................... 468 L CONSULT-IIReferenceValuein DataMonitorMode
. 468 On Board Diagnosis Logic ................................... 468 DTC Confirmation Procedure .............................. 468 M Wiring Diagram .................................................... 470 Diagnostic Procedure .......................................... 471 Component Inspection ......................................... 474 DTC P1572 ASCD BRAKE SWITCH ..................... 475 Component Description ....................................... 475 CONSULT-IIReferenceValuein DataMonitorMode
. 475 On Board Diagnosis Logic ................................... 475 DTC Confirmation Procedure .............................. 476 Overall Function Check ....................................... 477 Wiring Diagram .................................................... 478 Diagnostic Procedure .......................................... 480 Component Inspection ......................................... 485 DTC P1574 ASCD VEHICLE SPEED SENSOR .... 487 Component Description ....................................... 487 On Board Diagnosis Logic ................................... 487

Revision: December 2006

EC-5

2006 Sentra

DTC Confirmation Procedure .............................. 487 Diagnostic Procedure .......................................... 488 DTC P1805 BRAKE SWITCH ................................ 489 Description ........................................................... 489 CONSULT-IIReference Valuein DataMonitorMode
. 489 On Board Diagnosis Logic ................................... 489 DTC Confirmation Procedure .............................. 489 Wiring Diagram .................................................... 490 Diagnostic Procedure .......................................... 491 Component Inspection ......................................... 493 DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY .................................................................... 494 Component Description ....................................... 494 CONSULT-IIReference Valuein DataMonitorMode
. 494 On Board Diagnosis Logic ................................... 494 DTC Confirmation Procedure .............................. 494 Wiring Diagram .................................................... 496 Diagnostic Procedure .......................................... 498 Component Inspection ......................................... 499 DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION ............................................................. 500 Description ........................................................... 500 On Board Diagnosis Logic ................................... 500 DTC Confirmation Procedure .............................. 500 Wiring Diagram .................................................... 501 Diagnostic Procedure .......................................... 502 Component Inspection ......................................... 505 Removal and Installation ..................................... 506 DTC P2118 THROTTLE CONTROL MOTOR ........ 507 Component Description ....................................... 507 On Board Diagnosis Logic ................................... 507 DTC Confirmation Procedure .............................. 507 Wiring Diagram .................................................... 508 Diagnostic Procedure .......................................... 509 Component Inspection ......................................... 510 Removal and Installation ..................................... 511 DTC P2119 ELECTRIC THROTTLE CONTROL ACTUATOR ............................................................ 512 Component Description ....................................... 512 On Board Diagnosis Logic ................................... 512 DTC Confirmation Procedure .............................. 512 Diagnostic Procedure .......................................... 513 DTC P2122, P2123 APP SENSOR ........................ 514 Component Description ....................................... 514 CONSULT-IIReference Valuein DataMonitorMode
. 514 On Board Diagnosis Logic ................................... 514 DTC Confirmation Procedure .............................. 515 Wiring Diagram .................................................... 516 Diagnostic Procedure .......................................... 517 Component Inspection ......................................... 520 Removal and Installation ..................................... 520 DTC P2127, P2128 APP SENSOR ........................ 521 Component Description ....................................... 521 CONSULT-IIReference Valuein DataMonitorMode
. 521 On Board Diagnosis Logic ................................... 521

DTC Confirmation Procedure ...............................522 Wiring Diagram ....................................................523 Diagnostic Procedure ...........................................524 Component Inspection .........................................527 Removal and Installation ......................................527 DTC P2135 TP SENSOR .......................................528 Component Description .......................................528 CONSULT-IIReferenceValue inData MonitorMode
.528 On Board Diagnosis Logic ...................................528 DTC Confirmation Procedure ...............................529 Wiring Diagram ....................................................530 Diagnostic Procedure ...........................................531 Component Inspection .........................................534 Removal and Installation ......................................534 DTC P2138 APP SENSOR .....................................535 Component Description .......................................535 CONSULT-IIReferenceValue inData MonitorMode
.535 On Board Diagnosis Logic ...................................535 DTC Confirmation Procedure ...............................536 Wiring Diagram ....................................................537 Diagnostic Procedure ...........................................538 Component Inspection .........................................542 Removal and Installation ......................................542 DTC P2A00 A/F SENSOR 1 ...................................543 Component Description .......................................543 CONSULT-IIReferenceValue inData MonitorMode
.543 On Board Diagnosis Logic ...................................543 Overall Function Check ........................................544 Wiring Diagram ....................................................545 Diagnostic Procedure ...........................................546 Removal and Installation ......................................549 ASCD BRAKE SWITCH .........................................550 Component Description .......................................550 CONSULT-IIReferenceValue inData MonitorMode
.550 Wiring Diagram ....................................................551 Diagnostic Procedure ...........................................553 Component Inspection .........................................558 ASCD INDICATOR .................................................560 Component Description .......................................560 CONSULT-IIReferenceValue inData MonitorMode
.560 Wiring Diagram ....................................................561 Diagnostic Procedure ...........................................562 ELECTRICAL LOAD SIGNAL ...............................563 CONSULT-IIReferenceValue inData MonitorMode
.563 Wiring Diagram ....................................................564 Diagnostic Procedure ...........................................567 FUEL INJECTOR ....................................................573 Component Description .......................................573 CONSULT-IIReferenceValue inData MonitorMode
.573 Wiring Diagram ....................................................574 Diagnostic Procedure ...........................................575

Revision: December 2006

EC-6

2006 Sentra

Component Inspection ........................................ 578 Removal and Installation ..................................... 578 FUEL PUMP .......................................................... 579 System Description ............................................. 579 CONSULT-II Reference Value in Data Monitor Mode
. 579 Wiring Diagram ................................................... 580 Diagnostic Procedure .......................................... 581 Component Inspection ........................................ 583 Removal and Installation ..................................... 583 IGNITION SIGNAL ................................................. 584 Component Description ....................................... 584 Wiring Diagram ................................................... 585 Diagnostic Procedure .......................................... 590 Component Inspection ........................................ 594 Removal and Installation ..................................... 595 REFRIGERANT PRESSURE SENSOR ................ 596 Description .......................................................... 596 Wiring Diagram ................................................... 597 Diagnostic Procedure .......................................... 598 Removal and Installation ..................................... 600 MIL & DATA LINK CONNECTORS ....................... 601 Wiring Diagram ................................................... 601 SERVICE DATA AND SPECIFICATIONS (SDS) ... 603 Fuel Pressure ...................................................... 603 Idle Speed and Ignition Timing ............................ 603 Mass Air Flow Sensor ......................................... 603 Engine Coolant Temperature Sensor .................. 603 Fuel Pump ........................................................... 603 Fuel Injector ........................................................ 603 Throttle Control Motor ......................................... 603 Air Fuel Ratio (A/F) Sensor 1 Heater .................. 603 Heated Oxygen Sensor 2 Heater ........................ 603 Calculated Load Value ........................................ 603 Intake Air Temperature Sensor ........................... 604 Crankshaft Position Sensor (POS) ...................... 604 Camshaft Position Sensor (PHASE) ................... 604 Fuel Tank Temperature Sensor ........................... 604
QR25DE
INDEX FOR DTC ................................................... 605 DTC No. Index .................................................... 605 Alphabetical Index ............................................... 608
PRECAUTIONS ......................................................611 Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" ..............................................................611 On Board Diagnostic (OBD) System of Engine and A/T ........................................................................611 Precaution ............................................................611
PREPARATION ...................................................... 615 Special Service Tools .......................................... 615 Commercial Service Tools ................................... 616
ENGINE CONTROL SYSTEM ............................... 617 System Diagram .................................................. 617 Multiport Fuel Injection (MFI) System ................. 618 Electronic Ignition (EI) System ............................ 620 Fuel Cut Control (at No Load and High Engine

Speed) ................................................................. 621

AIR CONDITIONING CUT CONTROL ................... 622 A

Input/output Signal Chart ..................................... 622

System Description .............................................. 622

AUTOMATIC SPEED CONTROL DEVICE (ASCD). 623 EC System Description .............................................. 623

Component Description ....................................... 624

CAN COMMUNICATION ........................................ 625 System Description .............................................. 625 C

EVAPORATIVE EMISSION SYSTEM .................... 626

Description ........................................................... 626

Component Inspection ......................................... 629 D

Removal and Installation ..................................... 630

How to Detect Fuel Vapor Leakage ..................... 630

ON BOARD REFUELING VAPOR RECOVERY

E

(ORVR) ................................................................... 633

System Description .............................................. 633

Diagnostic Procedure .......................................... 634 Component Inspection ......................................... 636 F

POSITIVE CRANKCASE VENTILATION .............. 639

Description ........................................................... 639

Component Inspection ......................................... 639 G

NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-

NATS) ..................................................................... 641

Description ........................................................... 641 H ON BOARD DIAGNOSTIC (OBD) SYSTEM ......... 642

Introduction .......................................................... 642

Two Trip Detection Logic ..................................... 642 Emission-related Diagnostic Information ............. 643 I

Malfunction Indicator Lamp (MIL) ........................ 655

OBD System Operation Chart ............................. 658 BASIC SERVICE PROCEDURE ............................ 664 J

Basic Inspection .................................................. 664

Idle Speed and Ignition Timing Check ................. 669

VIN Registration .................................................. 670 K

Accelerator Pedal Released Position Learning ... 670

Throttle Valve Closed Position Learning .............. 671

Idle Air Volume Learning ..................................... 671 L Fuel Pressure Check ........................................... 673

TROUBLE DIAGNOSIS ......................................... 677

Trouble Diagnosis Introduction ............................ 677 DTC Inspection Priority Chart .............................. 683 M

Fail-safe Chart ..................................................... 685

Symptom Matrix Chart ......................................... 686

Engine Control Component Parts Location ......... 690

Vacuum Hose Drawing ........................................ 695

Circuit Diagram .................................................... 696

ECM Harness Connector Terminal Layout .......... 698

ECM Terminals and Reference Value .................. 698

CONSULT-II Function (ENGINE) ......................... 705

Generic Scan Tool (GST) Function ...................... 717

CONSULT-IIReferenceValuein DataMonitorMode

. 719

Major Sensor Reference Graph in Data Monitor

Mode .................................................................... 722

TROUBLE DIAGNOSIS - SPECIFICATION VALUE. 725

Description ........................................................... 725

Testing Condition ................................................. 725

Revision: December 2006

EC-7

2006 Sentra

Inspection Procedure ........................................... 725 Diagnostic Procedure .......................................... 726 TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ...................................................................... 735 Description ........................................................... 735 Diagnostic Procedure .......................................... 735 POWER SUPPLY AND GROUND CIRCUIT .......... 736 Wiring Diagram .................................................... 736 Diagnostic Procedure .......................................... 737 Component Inspection ......................................... 742 Ground Inspection ............................................... 742 DTC U1000, U1001 CAN COMMUNICATION LINE. 743 Description ........................................................... 743 On Board Diagnosis Logic ................................... 743 DTC Confirmation Procedure .............................. 743 Wiring Diagram .................................................... 744 Diagnostic Procedure .......................................... 745 DTC U1010 CAN COMMUNICATION .................... 746 Description ........................................................... 746 On Board Diagnosis Logic ................................... 746 DTC Confirmation Procedure .............................. 746 Diagnostic Procedure .......................................... 747 DTC P0011 IVT CONTROL .................................... 748 Description ........................................................... 748 CONSULT-IIReference Valuein DataMonitorMode
. 748 On Board Diagnosis Logic ................................... 749 DTC Confirmation Procedure .............................. 749 Diagnostic Procedure .......................................... 750 Component Inspection ......................................... 751 Removal and Installation ..................................... 751 DTC P0031, P0032 A/F SENSOR 1 HEATER ....... 752 Description ........................................................... 752 CONSULT-IIReference Valuein DataMonitorMode
. 752 On Board Diagnosis Logic ................................... 752 DTC Confirmation Procedure .............................. 752 Wiring Diagram .................................................... 753 Diagnostic Procedure .......................................... 754 Component Inspection ......................................... 756 Removal and Installation ..................................... 756 DTC P0037, P0038 HO2S2 HEATER .................... 757 Description ........................................................... 757 CONSULT-IIReference Valuein DataMonitorMode
. 757 On Board Diagnosis Logic ................................... 757 DTC Confirmation Procedure .............................. 757 Wiring Diagram .................................................... 759 Diagnostic Procedure .......................................... 760 Component Inspection ......................................... 762 Removal and Installation ..................................... 762 DTC P0075 IVT CONTROL SOLENOID VALVE ... 763 Component Description ....................................... 763 CONSULT-IIReference Valuein DataMonitorMode
. 763 On Board Diagnosis Logic ................................... 763 DTC Confirmation Procedure .............................. 763 Wiring Diagram .................................................... 764 Diagnostic Procedure .......................................... 766

Component Inspection .........................................767 Removal and Installation ......................................767 DTC P0101 MAF SENSOR ....................................768 Component Description .......................................768 CONSULT-IIReferenceValue inData MonitorMode
.768 On Board Diagnosis Logic ...................................768 DTC Confirmation Procedure ...............................769 Overall Function Check ........................................770 Wiring Diagram ....................................................771 Diagnostic Procedure ...........................................772 Component Inspection .........................................775 Removal and Installation ......................................776 DTC P0102, P0103 MAF SENSOR ........................777 Component Description .......................................777 CONSULT-IIReferenceValue inData MonitorMode
.777 On Board Diagnosis Logic ...................................777 DTC Confirmation Procedure ...............................778 Wiring Diagram ....................................................779 Diagnostic Procedure ...........................................780 Component Inspection .........................................782 Removal and Installation ......................................784 DTC P0112, P0113 IAT SENSOR ...........................785 Component Description .......................................785 On Board Diagnosis Logic ...................................785 DTC Confirmation Procedure ...............................785 Wiring Diagram ....................................................787 Diagnostic Procedure ...........................................788 Component Inspection .........................................790 Removal and Installation ......................................790 DTC P0117, P0118 ECT SENSOR .........................791 Component Description .......................................791 On Board Diagnosis Logic ...................................791 DTC Confirmation Procedure ...............................792 Wiring Diagram ....................................................793 Diagnostic Procedure ...........................................794 Component Inspection .........................................796 Removal and Installation ......................................796 DTC P0122, P0123 TP SENSOR ...........................797 Component Description .......................................797 CONSULT-IIReferenceValue inData MonitorMode
.797 On Board Diagnosis Logic ...................................797 DTC Confirmation Procedure ...............................798 Wiring Diagram ....................................................799 Diagnostic Procedure ...........................................800 Component Inspection .........................................803 Removal and Installation ......................................803 DTC P0125 ECT SENSOR .....................................804 Description ...........................................................804 On Board Diagnosis Logic ...................................804 DTC Confirmation Procedure ...............................804 Diagnostic Procedure ...........................................805 Component Inspection .........................................806 Removal and Installation ......................................806 DTC P0127 IAT SENSOR .......................................807 Component Description .......................................807 On Board Diagnosis Logic ...................................807

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DTC Confirmation Procedure .............................. 807 Diagnostic Procedure .......................................... 808 Component Inspection ........................................ 809 Removal and Installation ..................................... 809 DTC P0128 THERMOSTAT FUNCTION ............... 810 On Board Diagnosis Logic .................................. 810 DTC Confirmation Procedure .............................. 810 Diagnostic Procedure .......................................... 810 Component Inspection .........................................811 Removal and Installation ......................................811 DTC P0130 A/F SENSOR 1 .................................. 812 Component Description ....................................... 812 CONSULT-II Reference Value in Data Monitor Mode
. 812 On Board Diagnosis Logic .................................. 812 DTC Confirmation Procedure .............................. 812 Overall Function Check ....................................... 813 Wiring Diagram ................................................... 815 Diagnostic Procedure .......................................... 816 Removal and Installation ..................................... 818 DTC P0131 A/F SENSOR 1 .................................. 819 Component Description ....................................... 819 CONSULT-II Reference Value in Data Monitor Mode
. 819 On Board Diagnosis Logic .................................. 819 DTC Confirmation Procedure .............................. 820 Wiring Diagram ................................................... 821 Diagnostic Procedure .......................................... 822 Removal and Installation ..................................... 824 DTC P0132 A/F SENSOR 1 .................................. 825 Component Description ....................................... 825 CONSULT-II Reference Value in Data Monitor Mode
. 825 On Board Diagnosis Logic .................................. 825 DTC Confirmation Procedure .............................. 826 Wiring Diagram ................................................... 827 Diagnostic Procedure .......................................... 828 Removal and Installation ..................................... 830 DTC P0133 A/F SENSOR 1 .................................. 831 Component Description ....................................... 831 CONSULT-II Reference Value in Data Monitor Mode
. 831 On Board Diagnosis Logic .................................. 831 DTC Confirmation Procedure .............................. 832 Wiring Diagram ................................................... 834 Diagnostic Procedure .......................................... 835 Removal and Installation ..................................... 840 DTC P0137 HO2S2 ................................................ 841 Component Description ....................................... 841 CONSULT-II Reference Value in Data Monitor Mode
. 841 On Board Diagnosis Logic .................................. 841 DTC Confirmation Procedure .............................. 842 Overall Function Check ....................................... 842 Wiring Diagram ................................................... 844 Diagnostic Procedure .......................................... 845 Component Inspection ........................................ 847 Removal and Installation ..................................... 848

DTC P0138 HO2S2 ................................................ 849 Component Description ....................................... 849 A CONSULT-IIReferenceValuein DataMonitorMode . 849 On Board Diagnosis Logic ................................... 849 EC DTC Confirmation Procedure .............................. 850 Overall Function Check ....................................... 851 Wiring Diagram .................................................... 852 Diagnostic Procedure .......................................... 853 C Component Inspection ......................................... 856 Removal and Installation ..................................... 858
DTC P0139 HO2S2 ................................................ 859 D Component Description ....................................... 859 CONSULT-IIReferenceValuein DataMonitorMode . 859 E On Board Diagnosis Logic ................................... 859 DTC Confirmation Procedure .............................. 860 Overall Function Check ....................................... 860 Wiring Diagram .................................................... 862 F Diagnostic Procedure .......................................... 863 Component Inspection ......................................... 865 Removal and Installation ..................................... 866 G
DTCP0171 FUELINJECTIONSYSTEMFUNCTION. 867 On Board Diagnosis Logic ................................... 867 DTC Confirmation Procedure .............................. 867 H Wiring Diagram .................................................... 869 Diagnostic Procedure .......................................... 871
DTCP0172 FUELINJECTIONSYSTEMFUNCTION. 875 On Board Diagnosis Logic ................................... 875 I DTC Confirmation Procedure .............................. 875 Wiring Diagram .................................................... 877 Diagnostic Procedure .......................................... 879 J
DTC P0181 FTT SENSOR ..................................... 882 Component Description ....................................... 882 On Board Diagnosis Logic ................................... 882 K DTC Confirmation Procedure .............................. 882 Wiring Diagram .................................................... 884 Diagnostic Procedure .......................................... 885 L Component Inspection ......................................... 886 Removal and Installation ..................................... 886
DTC P0182, P0183 FTT SENSOR ......................... 887 Component Description ....................................... 887 M On Board Diagnosis Logic ................................... 887 DTC Confirmation Procedure .............................. 887 Wiring Diagram .................................................... 888 Diagnostic Procedure .......................................... 889 Component Inspection ......................................... 890 Removal and Installation ..................................... 890
DTC P0222, P0223 TP SENSOR ........................... 891 Component Description ....................................... 891 CONSULT-IIReferenceValuein DataMonitorMode . 891 On Board Diagnosis Logic ................................... 891 DTC Confirmation Procedure .............................. 892 Wiring Diagram .................................................... 893 Diagnostic Procedure .......................................... 894 Component Inspection ......................................... 897 Removal and Installation ..................................... 897
DTC P0300 - P0304 MULTIPLE CYLINDER MIS-

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FIRE, NO. 1 - 4 CYLINDER MISFIRE .................... 898 On Board Diagnosis Logic ................................... 898 DTC Confirmation Procedure .............................. 899 Diagnostic Procedure .......................................... 900
DTC P0327, P0328 KS ........................................... 905 Component Description ....................................... 905 On Board Diagnosis Logic ................................... 905 DTC Confirmation Procedure .............................. 905 Wiring Diagram .................................................... 906 Diagnostic Procedure .......................................... 907 Component Inspection ......................................... 908 Removal and Installation ..................................... 909
DTC P0335 CKP SENSOR (POS) ......................... 910 Component Description ....................................... 910 CONSULT-IIReference Valuein DataMonitorMode . 910 On Board Diagnosis Logic ................................... 910 DTC Confirmation Procedure .............................. 911 Wiring Diagram .................................................... 912 Diagnostic Procedure .......................................... 913 Component Inspection ......................................... 915 Removal and Installation ..................................... 916
DTC P0340 CMP SENSOR (PHASE) .................... 917 Component Description ....................................... 917 On Board Diagnosis Logic ................................... 917 DTC Confirmation Procedure .............................. 918 Wiring Diagram .................................................... 919 Diagnostic Procedure .......................................... 920 Component Inspection ......................................... 923 Removal and Installation ..................................... 923
DTC P0420 THREE WAY CATALYST FUNCTION . 924 On Board Diagnosis Logic ................................... 924 DTC Confirmation Procedure .............................. 924 Overall Function Check ....................................... 925 Diagnostic Procedure .......................................... 926
DTC P0441 EVAP CONTROL SYSTEM ................ 929 System Description .............................................. 929 On Board Diagnosis Logic ................................... 929 DTC Confirmation Procedure .............................. 930 Overall Function Check ....................................... 930 Diagnostic Procedure .......................................... 931
DTC P0442 EVAP CONTROL SYSTEM ................ 935 On Board Diagnosis Logic ................................... 935 DTC Confirmation Procedure .............................. 936 Diagnostic Procedure .......................................... 938
DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE .............................. 944
Description ........................................................... 944 CONSULT-IIReference Valuein DataMonitorMode
. 944 On Board Diagnosis Logic ................................... 945 DTC Confirmation Procedure .............................. 945 Wiring Diagram .................................................... 946 Diagnostic Procedure .......................................... 948 Component Inspection ......................................... 951 Removal and Installation ..................................... 951 DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE ..................... 952 Description ........................................................... 952

CONSULT-IIReferenceValue inData MonitorMode .952
On Board Diagnosis Logic ...................................953 DTC Confirmation Procedure ...............................953 Wiring Diagram ....................................................954 Diagnostic Procedure ...........................................956 Component Inspection .........................................957 Removal and Installation ......................................958 DTC P0447 EVAP CANISTER VENT CONTROL VALVE .....................................................................959 Component Description .......................................959 CONSULT-IIReferenceValue inData MonitorMode
.959 On Board Diagnosis Logic ...................................959 DTC Confirmation Procedure ...............................960 Wiring Diagram ....................................................961 Diagnostic Procedure ...........................................962 Component Inspection .........................................964 DTC P0448 EVAP CANISTER VENT CONTROL VALVE .....................................................................966 Component Description .......................................966 CONSULT-IIReferenceValue inData MonitorMode
.966 On Board Diagnosis Logic ...................................966 DTC Confirmation Procedure ...............................967 Wiring Diagram ....................................................968 Diagnostic Procedure ...........................................969 Component Inspection .........................................971 DTC P0451 EVAPCONTROLSYSTEMPRESSURE SENSOR .................................................................973 Component Description .......................................973 CONSULT-IIReferenceValue inData MonitorMode
.973 On Board Diagnosis Logic ...................................973 DTC Confirmation Procedure ...............................974 Diagnostic Procedure ...........................................974 Component Inspection .........................................975 DTC P0452 EVAPCONTROLSYSTEMPRESSURE SENSOR .................................................................976 Component Description .......................................976 CONSULT-IIReferenceValue inData MonitorMode
.976 On Board Diagnosis Logic ...................................976 DTC Confirmation Procedure ...............................977 Wiring Diagram ....................................................978 Diagnostic Procedure ...........................................979 Component Inspection .........................................982 DTC P0453 EVAPCONTROLSYSTEMPRESSURE SENSOR .................................................................983 Component Description .......................................983 CONSULT-IIReferenceValue inData MonitorMode
.983 On Board Diagnosis Logic ...................................983 DTC Confirmation Procedure ...............................984 Wiring Diagram ....................................................985 Diagnostic Procedure ...........................................986 Component Inspection .........................................990 DTC P0455 EVAP CONTROL SYSTEM ................991 On Board Diagnosis Logic ...................................991

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DTC Confirmation Procedure .............................. 992 Diagnostic Procedure .......................................... 993 DTC P0456 EVAP CONTROL SYSTEM ............... 999 On Board Diagnosis Logic .................................. 999 DTC Confirmation Procedure .............................1. 000 Overall Function Check ......................................1. 001 Diagnostic Procedure ..........................................1002 DTC P0460 FUEL LEVEL SENSOR ....................1. 009 Component Description .......................................1009 On Board Diagnostic Logic ................................1. 009 DTC Confirmation Procedure .............................1. 009 Diagnostic Procedure ..........................................1010 Removal and Installation .....................................1010 DTC P0461 FUEL LEVEL SENSOR .....................1011 Component Description .......................................1011 On Board Diagnostic Logic .................................1011 Overall Function Check .......................................1011 Diagnostic Procedure ..........................................1012 Removal and Installation .....................................1012 DTC P0462, P0463 FUEL LEVEL SENSOR ........1. 013 Component Description .......................................1013 On Board Diagnostic Logic ................................1. 013 DTC Confirmation Procedure .............................1. 013 Diagnostic Procedure ..........................................1014 Removal and Installation .....................................1014 DTC P0500 VSS ...................................................1. 015 Component Description .......................................1015 On Board Diagnosis Logic .................................1. 015 DTC Confirmation Procedure .............................1. 015 Overall Function Check ......................................1. 016 Diagnostic Procedure ..........................................1016 DTC P0506 ISC SYSTEM .....................................1. 017 Description ..........................................................1017 On Board Diagnosis Logic .................................1. 017 DTC Confirmation Procedure .............................1. 017 Diagnostic Procedure ..........................................1018 DTC P0507 ISC SYSTEM .....................................1. 019 Description ..........................................................1019 On Board Diagnosis Logic .................................1. 019 DTC Confirmation Procedure .............................1. 019 Diagnostic Procedure ..........................................1020 DTC P0550 PSP SENSOR ...................................1. 021 Component Description .......................................1021 CONSULT-II Reference Value in Data Monitor Mode
1021 On Board Diagnosis Logic .................................1. 021 DTC Confirmation Procedure .............................1. 021 Wiring Diagram ...................................................1022 Diagnostic Procedure ..........................................1023 Component Inspection .......................................1. 025 Removal and Installation .....................................1025 DTC P0603 ECM POWER SUPPLY .....................1. 026 Component Description .......................................1026 On Board Diagnosis Logic .................................1. 026 DTC Confirmation Procedure .............................1. 026 Wiring Diagram ...................................................1027 Diagnostic Procedure ..........................................1028 DTC P0605 ECM ..................................................1. 030 Component Description .......................................1030

On Board Diagnosis Logic ..................................1. 030

DTC Confirmation Procedure .............................1. 030 A

Diagnostic Procedure .........................................1. 031

DTC P0643 SENSOR POWER SUPPLY ..............1. 033

On Board Diagnosis Logic ..................................1. 033 EC DTC Confirmation Procedure .............................1. 033

Wiring Diagram ...................................................1. 034

Diagnostic Procedure .........................................1. 036 DTC P0850 PNP SWITCH ....................................1. 038 C

Component Description ......................................1. 038

CONSULT-IIReferenceValuein DataMonitorMode

1038 D

On Board Diagnosis Logic ..................................1. 038

DTC Confirmation Procedure .............................1. 038

Overall Function Check ......................................1. 039 E Wiring Diagram ...................................................1. 040

Diagnostic Procedure .........................................1. 041

DTC P1148 CLOSED LOOP CONTROL ..............1. 042 On Board Diagnosis Logic ..................................1. 042 F

DTC P1217 ENGINE OVER TEMPERATURE ......1. 043

System Description .............................................1. 043

CONSULT-IIReferenceValuein DataMonitorMode

G

1044

On Board Diagnosis Logic ..................................1. 044

Overall Function Check ......................................1. 044 H Wiring Diagram ...................................................1. 047

Diagnostic Procedure .........................................1. 048

Main 12 Causes of Overheating .........................1. 054 Component Inspection ........................................1. 055 I

DTC P1225 TP SENSOR ......................................1. 056

Component Description ......................................1. 056 On Board Diagnosis Logic ..................................1. 056 J

DTC Confirmation Procedure .............................1. 056

Diagnostic Procedure .........................................1. 057

Removal and Installation ....................................1. 057 K

DTC P1226 TP SENSOR ......................................1. 058

Component Description ......................................1. 058

On Board Diagnosis Logic ..................................1. 058 L DTC Confirmation Procedure .............................1. 058

Diagnostic Procedure .........................................1. 059

Removal and Installation ....................................1. 059 DTC P1564 ASCD STEERING SWITCH ..............1. 060 M

Component Description ......................................1. 060

CONSULT-IIReferenceValuein DataMonitorMode

1060

On Board Diagnosis Logic ..................................1. 060

DTC Confirmation Procedure .............................1. 061

Wiring Diagram ...................................................1. 062

Diagnostic Procedure .........................................1. 063

Component Inspection ........................................1. 066

DTC P1572 ASCD BRAKE SWITCH ....................1. 067

Component Description ......................................1. 067

CONSULT-IIReferenceValuein DataMonitorMode

1067

On Board Diagnosis Logic ..................................1. 067

DTC Confirmation Procedure .............................1. 068

Wiring Diagram ...................................................1. 069

Diagnostic Procedure .........................................1. 071

Component Inspection ........................................1. 076

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DTC P1574 ASCD VEHICLE SPEED SENSOR ...1. 078 Component Description ......................................1. 078 On Board Diagnosis Logic ..................................1. 078 DTC Confirmation Procedure .............................1. 078 Diagnostic Procedure .........................................1. 079
DTC P1800 VIAS CONTROL SOLENOID VALVE 1. 080 Component Description ......................................1. 080 CONSULT-IIReference Valuein DataMonitorMode 1080 On Board Diagnosis Logic ..................................1. 080 DTC Confirmation Procedure .............................1. 080 Wiring Diagram ...................................................1. 081 Diagnostic Procedure .........................................1. 082 Component Inspection ........................................1. 083 Removal and Installation ....................................1. 084
DTC P1805 BRAKE SWITCH ...............................1. 085 Description ..........................................................1. 085 CONSULT-IIReference Valuein DataMonitorMode 1085 On Board Diagnosis Logic ..................................1. 085 DTC Confirmation Procedure .............................1. 085 Wiring Diagram ...................................................1. 086 Diagnostic Procedure .........................................1. 087 Component Inspection ........................................1. 089
DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY ...................................................................1. 090
Component Description ......................................1. 090 CONSULT-IIReference Valuein DataMonitorMode
1090 On Board Diagnosis Logic ..................................1. 090 DTC Confirmation Procedure .............................1. 090 Wiring Diagram ...................................................1. 092 Diagnostic Procedure .........................................1. 094 Component Inspection ........................................1. 095 DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION ............................................................1. 096 Description ..........................................................1. 096 On Board Diagnosis Logic ..................................1. 096 DTC Confirmation Procedure .............................1. 096 Wiring Diagram ...................................................1. 097 Diagnostic Procedure .........................................1. 098 Component Inspection ........................................1. 101 Removal and Installation ....................................1. 102 DTC P2118 THROTTLE CONTROL MOTOR .......1. 103 Component Description ......................................1. 103 On Board Diagnosis Logic ..................................1. 103 DTC Confirmation Procedure .............................1. 103 Wiring Diagram ...................................................1. 104 Diagnostic Procedure .........................................1. 105 Component Inspection ........................................1. 106 Removal and Installation ....................................1. 107 DTC P2119 ELECTRIC THROTTLE CONTROL ACTUATOR ...........................................................1. 108 Component Description ......................................1. 108 On Board Diagnosis Logic ..................................1. 108 DTC Confirmation Procedure .............................1. 108 Diagnostic Procedure .........................................1. 109 DTC P2122, P2123 APP SENSOR .......................1. 110 Component Description .......................................1110

CONSULT-IIReferenceValue inData MonitorMode 1110
On Board Diagnosis Logic ..................................1. 110 DTC Confirmation Procedure ...............................1111 Wiring Diagram ...................................................1. 112 Diagnostic Procedure ..........................................1. 113 Component Inspection ........................................1. 115 Removal and Installation .....................................1. 116 DTC P2127, P2128 APP SENSOR .......................1. 117 Component Description ......................................1. 117 CONSULT-IIReferenceValue inData MonitorMode
1117 On Board Diagnosis Logic ..................................1. 117 DTC Confirmation Procedure ..............................1. 118 Wiring Diagram ...................................................1. 119 Diagnostic Procedure ..........................................1.120 Component Inspection ........................................1.124 Removal and Installation .....................................1.124 DTC P2135 TP SENSOR ......................................1.125 Component Description ......................................1.125 CONSULT-IIReferenceValue inData MonitorMode
1125 On Board Diagnosis Logic ..................................1.125 DTC Confirmation Procedure ..............................1.126 Wiring Diagram ...................................................1.127 Diagnostic Procedure ..........................................1.128 Component Inspection ........................................1.131 Removal and Installation .....................................1.131 DTC P2138 APP SENSOR ....................................1.132 Component Description ......................................1.132 CONSULT-IIReferenceValue inData MonitorMode
1132 On Board Diagnosis Logic ..................................1.132 DTC Confirmation Procedure ..............................1.133 Wiring Diagram ...................................................1.134 Diagnostic Procedure ..........................................1.135 Component Inspection ........................................1.139 Removal and Installation .....................................1.139 DTC P2A00 A/F SENSOR 1 ..................................1.140 Component Description ......................................1.140 CONSULT-IIReferenceValue inData MonitorMode
1140 On Board Diagnosis Logic ..................................1.140 DTC Confirmation Procedure ..............................1.141 Wiring Diagram ...................................................1.142 Diagnostic Procedure ..........................................1.143 Removal and Installation .....................................1.146 ASCD BRAKE SWITCH ........................................1.147 Component Description ......................................1.147 CONSULT-IIReferenceValue inData MonitorMode
1147 Wiring Diagram ...................................................1.148 Diagnostic Procedure ..........................................1.150 Component Inspection ........................................1.155 ASCD INDICATOR ................................................1.157 Component Description ......................................1.157 CONSULT-IIReferenceValue inData MonitorMode
1157

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Wiring Diagram ...................................................1158 Diagnostic Procedure ..........................................1159 ELECTRICAL LOAD SIGNAL ...............................1160 CONSULT-II Reference Value in Data Monitor Mode
1160 Wiring Diagram ...................................................1161 Diagnostic Procedure ..........................................1166 FUEL INJECTOR ...................................................1172 Component Description .......................................1172 CONSULT-II Reference Value in Data Monitor Mode
1172 Wiring Diagram ...................................................1173 Diagnostic Procedure ..........................................1174 Component Inspection ........................................1177 Removal and Installation .....................................1177 FUEL PUMP ..........................................................1178 Description ..........................................................1178 CONSULT-II Reference Value in Data Monitor Mode
1178 Wiring Diagram ...................................................1179 Diagnostic Procedure ..........................................1180 Component Inspection ........................................1182 Removal and Installation .....................................1183 IGNITION SIGNAL .................................................1184 Component Description .......................................1184 Wiring Diagram ...................................................1185 Diagnostic Procedure ..........................................1190 Component Inspection ........................................1194 Removal and Installation .....................................1196

REFRIGERANT PRESSURE SENSOR ................1. 197 Component Description ......................................1. 197 A Wiring Diagram ...................................................1. 198 Diagnostic Procedure .........................................1. 199 Removal and Installation ....................................1. 201 EC
VIAS ......................................................................1. 202 Description ..........................................................1. 202 CONSULT-IIReferenceValuein DataMonitorMode 1203 C Wiring Diagram ...................................................1. 204 Diagnostic Procedure .........................................1. 206 Component Inspection ........................................1. 208 D Removal and Installation ....................................1. 209
MIL AND DATA LINK CONNECTOR ....................1. 210 Wiring Diagram ...................................................1. 210 E
SERVICE DATA AND SPECIFICATIONS (SDS) ..1. 212 Fuel Pressure .....................................................1. 212 Idle Speed and Ignition Timing ...........................1. 212 Calculated Load Value ........................................1. 212 F Mass Air Flow Sensor .........................................1. 212 Intake Air Temperature Sensor ...........................1. 212 Engine Coolant Temperature Sensor .................1. 212 G Crankshaft Position Sensor (POS) .....................1. 212 Camshaft Position Sensor (PHASE) ..................1. 212 Air Fuel Ratio (A/F) Sensor 1 Heater ..................1. 212 H Heated Oxygen Sensor 2 Heater .......................1. 212 Throttle Control Motor .........................................1. 212 Fuel Injector ........................................................1. 213 Fuel Pump ..........................................................1. 213 I

J

K

L

M

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INDEX FOR DTC

[QG18DE]

INDEX FOR DTC

PFP:00024

DTC No. Index

UBS00JRB

NOTE: G If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-152, "DTC U1000, U1001 CAN COMMUNICATION LINE" .
G If DTC U1010 is displayed with other DTC, first perform the trouble diagnosis for DTC U1010. Refer to EC-155, "DTC U1010 CAN COMMUNICATION" .

DTC*1 CONSULT-II
GST*2 U1000
U1001 U1010

ECM*3
1000*4 1001*4 1010

P0000

0000

P0011 P0031 P0032 P0037 P0038 P0075 P0101 P0102 P0103 P0112 P0113 P0117 P0118 P0122 P0123 P0125 P0127 P0128 P0130 P0131 P0132 P0133 P0137 P0138 P0139 P0171 P0172 P0181 P0182 P0183

0011 0031 0032 0037 0038 0075 0101 0102 0103 0112 0113 0117 0118 0122 0123 0125 0127 0128 0130 0131 0132 0133 0137 0138 0139 0171 0172 0181 0182 0183

Items (CONSULT-II screen terms)
CAN COMM CIRCUIT
CAN COMM CIRCUIT CONTROL UNIT(CAN) NO DTC IS DETECTED. FURTHER TESTING MAY BE REQUIRED. INT/V TIM CONT-B1 A/F SEN1 HTR (B1) A/F SEN1 HTR (B1) HO2S2 HTR (B1) HO2S2 HTR (B1) INT/V TIM V/CIR-B1 MAF SEN/CIRCUIT MAF SEN/CIRCUIT MAF SEN/CIRCUIT IAT SEN/CIRCUIT IAT SEN/CIRCUIT ECT SEN/CIRC ECT SEN/CIRC TP SEN 2/CIRC TP SEN 2/CIRC ECT SENSOR IAT SENSOR THERMSTAT FNCTN A/F SENSOR1 (B1) A/F SENSOR1 (B1) A/F SENSOR1 (B1) A/F SENSOR1 (B1) HO2S2 (B1) HO2S2 (B1) HO2S2 (B1) FUEL SYS-LEAN-B1 FUEL SYS-RICH-B1 FTT SENSOR FTT SEN/CIRCUIT FTT SEN/CIRCUIT

Reference page
EC-152 EC-152 EC-155
--
EC-157 EC-161 EC-161 EC-166 EC-166 EC-172 EC-177 EC-186 EC-186 EC-194 EC-194 EC-199 EC-199 EC-205 EC-205 EC-212 EC-215 EC-218 EC-220 EC-227 EC-234 EC-241 EC-251 EC-259 EC-269 EC-277 EC-285 EC-293 EC-298 EC-298

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DTC*1 CONSULT-II
GST*2 P0222 P0223 P0300 P0301 P0302 P0303 P0304 P0327 P0328 P0335 P0340 P0420 P0441 P0442 P0443 P0444 P0445 P0447 P0448 P0451 P0452 P0453 P0455 P0456 P0460 P0461 P0462 P0463 P0500 P0506 P0507 P0550 P0603 P0605 P0643 P0705 P0710 P0720 P0725 P0731 P0732 P0733

ECM*3
0222 0223 0300 0301 0302 0303 0304 0327 0328 0335 0340 0420 0441 0442 0443 0444 0445 0447 0448 0451 0452 0453 0455 0456 0460 0461 0462 0463 0500 0506 0507 0550 0603 0605 0643 0705 0710 0720 0725 0731 0732 0733

Revision: December 2006

INDEX FOR DTC
Items (CONSULT-II screen terms)
TP SEN 1/CIRC TP SEN 1/CIRC MULTI CYL MISFIRE CYL 1 MISFIRE CYL 2 MISFIRE CYL 3 MISFIRE CYL 4 MISFIRE KNOCK SEN/CIRC-B1 KNOCK SEN/CIRC-B1 CKP SEN/CIRCUIT CMP SEN/CIRC-B1 TW CATALYST SYS-B1 EVAP PURG FLOW/MON EVAP SMALL LEAK PURG VOLUME CONT/V PURG VOLUME CONT/V PURG VOLUME CONT/V VENT CONTROL VALVE VENT CONTROL VALVE EVAP SYS PRES SEN EVAP SYS PRES SEN EVAP SYS PRES SEN EVAP GROSS LEAK EVAP VERY SML LEAK FUEL LEV SEN SLOSH FUEL LEVEL SENSOR FUEL LEVL SEN/CIRC FUEL LEVL SEN/CIRC VEH SPEED SEN/CIRC*5 ISC SYSTEM ISC SYSTEM PW ST P SEN/CIRC ECM BACK UP/CIRC ECM SENSOR POWER/CIRC PNP SW/CIRC ATF TEMP SEN/CIRC VEH SPD SEN/CIR AT*5 ENGINE SPEED SIG A/T 1ST GR FNCTN A/T 2ND GR FNCTN A/T 3RD GR FNCTN
EC-15

[QG18DE]

Reference page

A

EC-302

EC

EC-302

EC-309

EC-309

C

EC-309

EC-309
D
EC-309

EC-316

EC-316

E

EC-321

EC-328

EC-335

F

EC-340

EC-346

G

EC-354

EC-362

EC-362

H

EC-369

EC-376

I

EC-384

EC-387

EC-393

J

EC-400

EC-407
K
EC-416

EC-418

EC-420

L

EC-420

EC-422
M
EC-424

EC-426

EC-428

EC-433

EC-437

EC-440

AT-114

AT-119

AT-125

AT-130

AT-134

AT-139

AT-144

2006 Sentra

INDEX FOR DTC

DTC*1
CONSULT-II GST*2

ECM*3

Items (CONSULT-II screen terms)

P0734

0734

A/T 4TH GR FNCTN

P0740

0740

TCC SOLENOID/CIRC

P0744

0744

A/T TCC S/V FNCTN

P0745

0745

L/PRESS SOL/CIRC

P0750

0750

SFT SOL A/CIRC

P0755

0755

SFT SOL B/CIRC

P0850

0850

P-N POS SW/CIRCUIT

P1148

1148

CLOSED LOOP-B1

P1217

1217

ENG OVER TEMP

P1225

1225

CTP LEARNING

P1226

1226

CTP LEARNING

P1564

1564

ASCD SW

P1572

1572

ASCD BRAKE SW

P1574

1574

ASCD VHL SPD SEN

P1610 - P1615

1610 - 1615

NATS MALFUNCTION

P1705

1705

TP SEN/CIRC A/T

P1760

1760

O/R CLTCH SOL/CIRC

P1805

1805

BRAKE SW/CIRCUIT

P2100

2100

ETC MOT PWR

P2101

2101

ETC FUNCTION/CIRC

P2103

2103

ETC MOT PWR

P2118

2118

ETC MOT

P2119

2119

ETC ACTR

P2122

2122

APP SEN 1/CIRC

P2123

2123

APP SEN 1/CIRC

P2127

2127

APP SEN 2/CIRC

P2128

2128

APP SEN 2/CIRC

P2135

2135

TP SENSOR

P2138

2138

APP SENSOR

P2A00

2A00

A/F SENSOR1 (B1)

*1: 1st trip DTC No. is the same as DTC No. *2: This number is prescribed by SAE J2012. *3: In Diagnostic Test Mode II (Self-diagnostic results), this number is controlled by NISSAN. *4: The troubleshooting for this DTC needs CONSULT-II. *5: When the fail-safe operations for both self-diagnoses occur, the MIL illuminates.

[QG18DE]
Reference page
AT-149 AT-158 AT-162 AT-172 AT-178 AT-182 EC-445 EC-449 EC-450 EC-464 EC-466 EC-468 EC-475 EC-487 BL-96 AT-186 AT-192 EC-489 EC-494 EC-500 EC-494 EC-507 EC-512 EC-514 EC-514 EC-521 EC-521 EC-528 EC-535 EC-543

Revision: December 2006

EC-16

2006 Sentra

INDEX FOR DTC

[QG18DE]

Alphabetical Index

UBS0 0JR C

NOTE:

A

G If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC

U1000, U1001. Refer to EC-743, "DTC U1000, U1001 CAN COMMUNICATION LINE" .

G If DTC U1010 is displayed with other DTC, first perform the trouble diagnosis for DTC U1010. Refer EC

to EC-155, "DTC U1010 CAN COMMUNICATION" .

Items (CONSULT-II screen terms)
A/F SENSOR1 (B1) A/F SENSOR1 (B1) A/F SENSOR1 (B1) A/F SENSOR1 (B1) A/F SENSOR1 (B1) A/F SEN1 HTR (B1) A/F SEN1 HTR (B1) A/T 1ST GR FNCTN A/T 2ND GR FNCTN A/T 3RD GR FNCTN A/T 4TH GR FNCTN A/T TCC S/V FNCTN APP SEN 1/CIRC APP SEN 1/CIRC APP SEN 2/CIRC APP SEN 2/CIRC APP SENSOR ASCD BRAKE SW ASCD SW ASCD VHL SPD SEN ATF TEMP SEN/CIRC BRAKE SW/CIRCUIT CAN COMM CIRCUIT CAN COMM CIRCUIT CKP SEN/CIRCUIT CLOSED LOOP-B1 CMP SEN/CIRC-B1 CONTROL UNIT(CAN) CTP LEARNING CTP LEARNING CYL 1 MISFIRE CYL 2 MISFIRE CYL 3 MISFIRE CYL 4 MISFIRE ECM ECM BACK UP/CIRC ECT SEN/CIRC

CONSULT-II GST*2 P0130 P0131 P0132 P0133 P2A00 P0031 P0032 P0731 P0732 P0733 P0734 P0744 P2122 P2123 P2127 P2128 P2138 P1572 P1564 P1574 P0710 P1805

DTC*1

U1000

U1001

P0335 P1148 P0340 U1010 P1225 P1226 P0301 P0302 P0303 P0304 P0605 P0603 P0117

ECM*3
0130 0131 0132 0133 2A00 0031 0032 0731 0732 0733 0734 0744 2122 2123 2127 2128 2138 1572 1564 1574 0710 1805 1000*4 1001*4 0335 1148 0340 1010 1225 1226 0301 0302 0303 0304 0605 0603 0117

C
Reference page

EC-220

D

EC-227

EC-234
E
EC-241

EC-543

EC-161

F

EC-161

AT-134

AT-139

G

AT-144

AT-149

H

AT-162

EC-514

EC-514

I

EC-521

EC-521

J

EC-535

EC-475

EC-468

K

EC-487

AT-119
L
EC-489

EC-152

EC-152

M

EC-321

EC-449

EC-328

EC-155

EC-464

EC-466

EC-309

EC-309

EC-309

EC-309

EC-437

EC-433

EC-199

Revision: December 2006

EC-17

2006 Sentra

Items (CONSULT-II screen terms)
ECT SEN/CIRC ECT SENSOR ENG OVER TEMP ENGINE SPEED SIG ETC ACTR ETC FUNCTION/CIRC ETC MOT ETC MOT PWR ETC MOT PWR EVAP GROSS LEAK EVAP PURG FLOW/MON EVAP SMALL LEAK EVAP SYS PRES SEN EVAP SYS PRES SEN EVAP SYS PRES SEN EVAP VERY SML LEAK FTT SEN/CIRCUIT FTT SEN/CIRCUIT FTT SENSOR FUEL LEV SEN SLOSH FUEL LEVEL SENSOR FUEL LEVL SEN/CIRC FUEL LEVL SEN/CIRC FUEL SYS-LEAN-B1 FUEL SYS-RICH-B1 HO2S2 (B1) HO2S2 (B1) HO2S2 (B1) HO2S2 HTR (B1) HO2S2 HTR (B1) IAT SEN/CIRCUIT IAT SEN/CIRCUIT IAT SENSOR INT/V TIM CONT-B1 INT/V TIM V/CIR-B1 ISC SYSTEM ISC SYSTEM KNOCK SEN/CIRC-B1 KNOCK SEN/CIRC-B1 L/PRESS SOL/CIRC MAF SEN/CIRCUIT MAF SEN/CIRCUIT
Revision: December 2006

INDEX FOR DTC

DTC*1 CONSULT-II
GST*2 P0118 P0125 P1217 P0725 P2119 P2101 P2118 P2100 P2103 P0455 P0441 P0442 P0451 P0452 P0453 P0456 P0182 P0183 P0181 P0460 P0461 P0462 P0463 P0171 P0172 P0137 P0138 P0139 P0037 P0038 P0112 P0113 P0127 P0011 P0075 P0506 P0507 P0327 P0328 P0745 P0101 P0102

ECM*3
0118 0125 1217 0725 2119 2101 2118 2100 2103 0455 0441 0442 0451 0452 0453 0456 0182 0183 0181 0460 0461 0462 0463 0171 0172 0137 0138 0139 0037 0038 0112 0113 0127 0011 0075 0506 0507 0327 0328 0745 0101 0102

EC-18

[QG18DE]
Reference page
EC-199 EC-212 EC-450 AT-130 EC-512 EC-500 EC-507 EC-494 EC-494 EC-400 EC-340 EC-346 EC-384 EC-387 EC-393 EC-407 EC-298 EC-298 EC-293 EC-416 EC-418 EC-420 EC-420 EC-277 EC-285 EC-251 EC-259 EC-269 EC-166 EC-166 EC-194 EC-194 EC-215 EC-157 EC-172 EC-424 EC-426 EC-316 EC-316 AT-172 EC-177 EC-186
2006 Sentra

INDEX FOR DTC

Items (CONSULT-II screen terms)

CONSULT-II GST*2

DTC*1

ECM*3

MAF SEN/CIRCUIT

P0103

0103

MULTI CYL MISFIRE

P0300

0300

NATS MALFUNCTION

P1610 - P1615

1610 - 1615

NO DTC IS DETECTED. FURTHER TESTING MAY BE REQUIRED.

P0000

0000

O/R CLTCH SOL/CIRC

P1760

1760

P-N POS SW/CIRCUIT

P0850

0850

PNP SW/CIRC

P0705

0705

PURG VOLUME CONT/V

P0443

0443

PURG VOLUME CONT/V

P0444

0444

PURG VOLUME CONT/V

P0445

0445

PW ST P SEN/CIRC

P0550

0550

SENSOR POWER/CIRC

P0643

0643

SFT SOL A/CIRC

P0750

0750

SFT SOL B/CIRC

P0755

0755

TCC SOLENOID/CIRC

P0740

0740

THERMSTAT FNCTN

P0128

0128

TP SEN 1/CIRC

P0222

0222

TP SEN 1/CIRC

P0223

0223

TP SEN 2/CIRC

P0122

0122

TP SEN 2/CIRC

P0123

0123

TP SENSOR

P2135

2135

TP SEN/CIRC A/T

P1705

1705

TW CATALYST SYS-B1

P0420

0420

VEH SPD SEN/CIR AT*5

P0720

0720

VEH SPEED SEN/CIRC*5

P0500

0500

VENT CONTROL VALVE

P0447

0447

VENT CONTROL VALVE

P0448

0448

*1: 1st trip DTC No. is the same as DTC No. *2: This number is prescribed by SAE J2012. *3: In Diagnostic Test Mode II (Self-diagnostic results), this number is controlled by NISSAN. *4: The troubleshooting for this DTC needs CONSULT-II. *5: When the fail-safe operations for both self-diagnoses occur, the MIL illuminates.

[QG18DE]

Reference page

A

EC-186

EC

EC-309

BL-96

C
--

AT-192

D

EC-445

AT-114

EC-354

E

EC-362

EC-362

F

EC-428

EC-440

AT-178

G

AT-182

AT-158

H

EC-218

EC-302

EC-302

I

EC-205

EC-205
J
EC-528

AT-186

EC-335

K

AT-125

EC-422

L

EC-369

EC-376
M

Revision: December 2006

EC-19

2006 Sentra

PRECAUTIONS

[QG18DE]

PRECAUTIONS

PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT

BELT PRE-TENSIONER"

UBS00K2R

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. Information necessary to service the system safely is included in the SRS and SB section of this Service Manual.
WARNING: G To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be performed by an authorized NISSAN/INFINITI dealer.
G Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag Module, see the SRS section.
G Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors.

On Board Diagnostic (OBD) System of Engine and A/T

UBS00JRE

The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the driver of a malfunction causing emission deterioration.
CAUTION: G Be sure to turn the ignition switch OFF and disconnect the battery ground cable before any repair
or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will cause the MIL to light up.
G Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will cause the MIL to light up due to the open circuit. (Be sure the connector is free from water, grease, dirt, bent terminals, etc.)
G Certain systems and components, especially those related to OBD, may use a new style slidelocking type harness connector. For description and how to disconnect, refer to PG-47, "HARNESS CONNECTOR" .
G Be sure to route and secure the harnesses properly after work. The interference of the harness with a bracket, etc. may cause the MIL to light up due to the short circuit.
G Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube may cause the MIL to light up due to the malfunction of the fuel injection system, etc.
G Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM and TCM (Transmission control module) before returning the vehicle to the customer.

Precaution

UBS00JRF

G Always use a 12 volt battery as power source.
G Do not attempt to disconnect battery cables while engine is running.
G Before connecting or disconnecting the ECM harness connector, turn ignition switch OFF and disconnect negative battery cable. Failure to do so may damage the ECM because battery voltage is applied to ECM even if ignition switch is turned off.
G Before removing parts, turn ignition switch OFF and then disconnect negative battery cable.

SEF289H

Revision: December 2006

EC-20

2006 Sentra

PRECAUTIONS
G Do not disassemble ECM. G If battery cable is disconnected, the memory will return to
the initial ECM values. The ECM will now start to self-control at its initial values. Engine operation can vary slightly when the cable is disconnected. However, this is not an indication of a malfunction. Do not replace parts because of a slight variation. G If the battery is disconnected, the following emissionrelated diagnostic information will be lost within 24 hours. ­ Diagnostic trouble codes ­ 1st trip diagnostic trouble codes ­ Freeze frame data ­ 1st trip freeze frame data ­ System readiness test (SRT) codes ­ Test values
G When connecting ECM harness connector, fasten it securely with a lever as far as it will go as shown in the figure.

G When connecting or disconnecting pin connectors into or from ECM, take care not to damage pin terminals (bend or break). Make sure that there are not any bends or breaks on ECM pin terminal, when connecting pin connectors.
G Securely connect ECM harness connectors. A poor connection can cause an extremely high (surge) voltage to develop in coil and condenser, thus resulting in damage to ICs.
G Keep engine control system harness at least 10 cm (4 in) away from adjacent harness, to prevent engine control system malfunctions due to receiving external noise, degraded operation of ICs, etc.
G Keep engine control system parts and harness dry.
G Before replacing ECM, perform "ECM Terminals and Reference Value" inspection and make sure ECM functions properly. Refer to EC-107 .
G Handle mass air flow sensor carefully to avoid damage.
G Do not disassemble mass air flow sensor.
G Do not clean mass air flow sensor with any type of detergent.
G Do not disassemble electric throttle control actuator.
G Even a slight leak in the air intake system can cause serious incidents.
G Do not shock or jar the camshaft position sensor (PHASE), crankshaft position sensor (POS).

Revision: December 2006

EC-21

[QG18DE]
A

EC

C
PBIB1164E
D

E

F

G H

BBIA0138E

I

J

K

L
PBIB0090E
M

MEF040D
2006 Sentra

PRECAUTIONS
G After performing each TROUBLE DIAGNOSIS, perform DTC Confirmation Procedure or Overall Function Check. The DTC should not be displayed in the DTC Confirmation Procedure if the repair is completed. The Overall Function Check should be a good result if the repair is completed.
G When measuring ECM signals with a circuit tester, never allow the two tester probes to contact. Accidental contact of probes will cause a short circuit and damage the ECM power transistor.
G Do not use ECM ground terminals when measuring input/ output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

[QG18DE]
SEF217U

G Do not operate fuel pump when there is no fuel in lines. G Tighten fuel hose clamps to the specified torque.

Revision: December 2006

EC-22

SEF348N PBIB1218E
2006 Sentra

PRECAUTIONS
G Do not depress accelerator pedal when starting. G Immediately after starting, do not rev up engine unneces-
sarily. G Do not rev up engine just prior to shutdown.
G When installing C.B. ham radio or a mobile phone, be sure to observe the following as it may adversely affect electronic control systems depending on installation location.
­ Keep the antenna as far as possible from the electronic control units.
­ Keep the antenna feeder line more than 20 cm (8 in) away from the harness of electronic controls. Do not let them run parallel for a long distance.
­ Adjust the antenna and feeder line so that the standingwave radio can be kept smaller.
­ Be sure to ground the radio to vehicle body.

[QG18DE]
A EC
C
SEF709Y
D E F G
SEF708Y
H I J K L M

Revision: December 2006

EC-23

2006 Sentra

PREPARATION

[QG18DE]

PREPARATION

PFP:00002

Special Service Tools

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Tool number (Kent-Moore No.) Tool name

Description

UBS00K2S

EG17650301 (J-33984-A) Radiator cap tester adapter

Adapting radiator cap tester to radiator cap and radiator filler neck a: 28 (1.10) dia. b: 31.4 (1.236) dia. c: 41.3 (1.626) dia. Unit: mm (in)

KV10114400 (J-38365) Heated oxygen sensor wrench

S-NT564

Loosening or tightening heated oxygen sensor 2 a: 22 mm (0.87 in)

KV109E0010 (J-46209) Break-out box

NT636
Measuring the ECM signals with a circuit tester

KV109E0080 (J-45819) Y-cable adapter

S-NT825

Measuring the ECM signals with a circuit tester

(J-44321) Fuel pressure gauge kit

S-NT826

Checking fuel pressure

(J-44626) Air fuel ratio (A/F) sensor wrench

LEC642

Loosening or tightening air fuel ratio (A/F) sensor 1

LEM054

Revision: December 2006

EC-24

2006 Sentra

Commercial Service Tools
Tool name Leak detector i.e.: (J-41416)
EVAP service port adapter i.e.: (J-41413-OBD)
Fuel filler cap adapter i.e.: (MLR-8382)
Oxygen sensor thread cleaner i.e.: (J-43897-18) (J-43897-12)
Anti-seize lubricant i.e: (PermatexTM 133AR or equivalent meeting MIL specification MIL-A-907)
Fuel tube removal tool

PREPARATION

[QG18DE]

Description Locating the EVAP leak

UBS00K2T
A
EC

C

NT703

Applying positive pressure through EVAP ser-

vice port

D

E

NT704

Checking fuel tank vacuum relief valve open-

F

ing pressure

G

NT815 AEM488 NT779

H

Reconditioning the exhaust system threads

before installing a new oxygen sensor or A/F

sensor. Use with anti-seize lubricant shown

below.

I

a: J-43897-18 18 mm with 1.5 mm pitch

dia., for Zirconia Oxygen Sensor or A/F

sensor

J

b: J-43897-12 12 mm with 1.25 mm pitch

dia., for Titania Oxygen Sensor

Lubricating oxygen sensor thread cleaning

tool when reconditioning exhaust system

K

threads.

L

For disconnecting fuel tube quick connectors

M

a: 7.9 mm (5/16 in)

LEC643

Revision: December 2006

EC-25

2006 Sentra

ENGINE CONTROL SYSTEM
ENGINE CONTROL SYSTEM System Diagram

[QG18DE]
PFP:23710
UBS00JRJ

Revision: December 2006

EC-26

PBIB3081E
2006 Sentra

ENGINE CONTROL SYSTEM

[QG18DE]

Multiport Fuel Injection (MFI) System
INPUT/OUTPUT SIGNAL CHART

UBS00JRK
A

Sensor Crankshaft position sensor (POS)

Input Signal to ECM Engine speed*3

ECM function

Actuator
EC

Camshaft position sensor (PHASE)

Piston position

Mass air flow sensor

Amount of intake air

C

Engine coolant temperature sensor

Engine coolant temperature

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

D

Park/neutral position (PNP) switch

Gear position

Fuel injec-

Knock sensor

Engine knocking condition

tion & mixture ratio

Fuel injector

E

Power steering pressure sensor

Power steering operation

control

Air fuel ratio (A/F) sensor 1

Density of oxygen in exhaust gas

Heated oxygen sensor 2*1

Density of oxygen in exhaust gas

F

Vehicle speed sensor*2

Vehicle speed

Air conditioner switch

Air conditioner operation

G

Electrical load

Electrical load signal

Battery

Battery voltage*3

H

*1: This sensor is not used to control the engine system under normal conditions.

*2: This signal is sent to the ECM through CAN communication line.

*3: ECM determines the start signal status by the signal of engine speed and battery voltage.

I
SYSTEM DESCRIPTION

The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of

time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the ECM memory. The program value is preset by engine operating conditions. These conditions are determined

J

by input signals (for engine speed and intake air) from both the crankshaft position sensor and the mass air

flow sensor.

K
VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION

In addition, the amount of fuel injected is compensated to improve engine performance under various operat-

ing conditions as listed below.

L

<Fuel increase>

G During warm-up

G When starting the engine

M

G During acceleration

G Hot-engine operation

G When selector lever is changed from N to D (A/T models)

G High-load, high-speed operation

<Fuel decrease>

G During deceleration

G During high engine speed operation

Revision: December 2006

EC-27

2006 Sentra

ENGINE CONTROL SYSTEM
MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)

[QG18DE]

PBIB3020E
The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission control. The three way catalyst (manifold) can then better reduce CO, HC and NOx emissions. This system uses air fuel ratio (A/F) sensor 1 in the exhaust manifold to monitor whether the engine operation is rich or lean. The ECM adjusts the injection pulse width according to the sensor voltage signal. For more information about air fuel ratio (A/F) sensor 1, refer to EC-220, "DTC P0130 A/F SENSOR 1" . This maintains the mixture ratio within the range of stoichiometric (ideal air-fuel mixture). This stage is referred to as the closed loop control condition. Heated oxygen sensor 2 is located downstream of the three way catalyst (manifold). Even if the switching characteristics of air fuel ratio (A/F) sensor 1 shift, the air-fuel ratio is controlled to stoichiometric by the signal from heated oxygen sensor 2.
Open Loop Control
The open loop system condition refers to when the ECM detects any of the following conditions. Feedback control stops in order to maintain stabilized fuel combustion.
G Deceleration and acceleration
G High-load, high-speed operation
G Malfunction of air fuel ratio (A/F) sensor 1 or its circuit
G Insufficient activation of air fuel ratio (A/F) sensor 1 at low engine coolant temperature
G High engine coolant temperature
G During warm-up
G After shifting from N to D (A/T models)
G When starting the engine
MIXTURE RATIO SELF-LEARNING CONTROL
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from air fuel ratio (A/F) sensor 1. This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to the theoretical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as originally designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic changes during operation (i.e., fuel injector clogging) directly affect mixture ratio. Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is then computed in terms of "injection pulse duration" to automatically compensate for the difference between the two ratios. "Fuel trim" refers to the feedback compensation value compared against the basic injection duration. Fuel trim includes short term fuel trim and long term fuel trim. "Short term fuel trim" is the short-term fuel compensation used to maintain the mixture ratio at its theoretical value. The signal from air fuel ratio (A/F) sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the theoretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and an increase in fuel volume if it is lean. "Long term fuel trim" is overall fuel compensation carried out long-term to compensate for continual deviation of the short term fuel trim from the central value. Such deviation will occur due to individual engine differences, wear over time and changes in the usage environment.

Revision: December 2006

EC-28

2006 Sentra

FUEL INJECTION TIMING

ENGINE CONTROL SYSTEM

[QG18DE]
A

EC

C

Two types of systems are used.

SEF337W

D

Sequential Multiport Fuel Injection System Fuel is injected into each cylinder during each engine cycle according to the firing order. This system is used E
when the engine is running.

Simultaneous Multiport Fuel Injection System

F

Fuel is injected simultaneously into all four cylinders twice each engine cycle. In other words, pulse signals of

the same width are simultaneously transmitted from the ECM.

The four fuel injectors will then receive the signals two times for each engine cycle.

This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.

G

FUEL SHUT-OFF Fuel to each cylinder is cut off during deceleration, operation of the engine at excessively high speeds or oper- H ation of the vehicle at excessively high speeds.

Electronic Ignition (EI) System
INPUT/OUTPUT SIGNAL CHART

UBS00JRL
I

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)

Engine speed*2

J

Camshaft position sensor (PHASE)

Piston position

Mass air flow sensor

Amount of intake air

K

Engine coolant temperature sensor

Engine coolant temperature

Throttle position sensor

Throttle position

Ignition

Accelerator pedal position sensor

Accelerator pedal position

timing con- Power transistor trol

L

Knock sensor

Engine knocking

Park/neutral position (PNP) switch

Gear position

M

Vehicle speed sensor*1

Vehicle speed

Battery

Battery voltage*2

*1: This signal is sent to the ECM through CAN communication line. *2: ECM determines the start signal status by the signal of engine speed and battery voltage.

SYSTEM DESCRIPTION
Firing order: 1 - 3 - 4 - 2 The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the engine. The ignition timing data is stored in the ECM. The ECM receives information such as the injection pulse width and camshaft position sensor signal. Computing this information, ignition signals are transmitted to the power transistor. During the following conditions, the ignition timing is revised by the ECM according to the other data stored in the ECM.
G At starting
G During warm-up
G At idle

Revision: December 2006

EC-29

2006 Sentra

ENGINE CONTROL SYSTEM

[QG18DE]

G At low battery voltage
G During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition. The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition.

Fuel Cut Control (at No Load and High Engine Speed)
INPUT/OUTPUT SIGNAL CHART

UBS00JRM

Sensor

Input Signal to ECM

ECM function

Actuator

Park/neutral position (PNP) switch

Neutral position

Accelerator pedal position sensor

Accelerator pedal position

Engine coolant temperature sensor
Crankshaft position sensor (POS) Camshaft position sensor (PHASE)

Engine coolant temperature Engine speed

Fuel cut control

Fuel injector

Vehicle speed sensor*

Vehicle speed

*: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION
If the engine speed is above 2,500 rpm under no load (for example, the shift position is neutral and engine speed is over 2,500 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies based on engine speed. Fuel cut will be operated until the engine speed reaches 2,000 rpm, then fuel cut will be cancelled.
NOTE: This function is different from deceleration control listed under "Multiport Fuel Injection (MFI) System", EC-27 .

Revision: December 2006

EC-30

2006 Sentra

AIR CONDITIONING CUT CONTROL

AIR CONDITIONING CUT CONTROL Input/output Signal Chart

Sensor

Input Signal to ECM

ECM function

Air conditioner switch

Air conditioner ON signal

Park/neutral position (PNP) switch

Neutral position

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Crankshaft position sensor (POS) Camshaft position sensor (PHASE)
Engine coolant temperature sensor

Engine speed*2 Engine coolant temperature

Air conditioner cut control

Refrigerant pressure sensor

Refrigerant pressure

Power steering pressure sensor

Power steering operation

Vehicle speed sensor*1

Vehicle speed

Battery

Battery voltage*2

*1: This signal is sent to the ECM through CAN communication line. *2: ECM determines the start signal status by the signal of engine speed and battery voltage.

System Description

This system improves engine operation when the air conditioner is used. Under the following conditions, the air conditioner is turned off. G When the accelerator pedal is fully depressed. G When cranking the engine. G At high engine speeds. G When the engine coolant temperature becomes excessively high. G When operating power steering during low engine speed or low vehicle speed. G When engine speed is excessively low. G When refrigerant pressure is excessively low or high.

[QG18DE]
PFP:23710
A
UBS0 0JR N
Actuator
EC

C

Air conditioner relay

D

E

F

G
UBS00JRO
H

I

J

K

L

M

Revision: December 2006

EC-31

2006 Sentra

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

[QG18DE]

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

PFP:18930

System Description
INPUT/OUTPUT SIGNAL CHART

UBS00JRP

Sensor

Input signal to ECM

ECM function

Actuator

ASCD brake switch

Brake pedal operation

Stop lamp switch

Brake pedal operation

ASCD clutch switch (M/T models) Clutch pedal operation

ASCD steering switch
Park/Neutral position (PNP) switch

ASCD steering switch operation ASCD vehicle speed control Gear position

Electric throttle control actuator

Combination meter*

Vehicle speed

TCM*

Powertrain revolution

*: This signal is sent to the ECM through CAN communication line.

BASIC ASCD SYSTEM
Refer to Owner's Manual for ASCD operating instructions. Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed without depressing accelerator pedal. Driver can set vehicle speed in advance between approximately 40 km/ h (25 MPH) and 144 km/h (89 MPH). ECM controls throttle angle of electric throttle control actuator to regulate engine speed. Operation status of ASCD is indicated by CRUISE indicator and SET indicator in combination meter. If any malfunction occurs in ASCD system, it automatically deactivates control.
NOTE: Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws.

SET OPERATION
Press MAIN switch. (The CRUISE indicator in combination meter illuminates.) When vehicle speed reaches a desired speed between approximately 40 km/h (25 MPH) and 144 km/h (89 MPH), press SET/COAST switch. (Then SET indicator in combination meter illuminates.)

ACCEL OPERATION
If the RESUME/ACCELERATE switch is pressed during cruise control driving, increase the vehicle speed until the switch is released or vehicle speed reaches maximum speed controlled by the system. And then ASCD will keep the new set speed.

CANCEL OPERATION When any of following conditions exist, cruise operation will be canceled.
G CANCEL switch is pressed G More than 2 switches at ASCD steering switch are pressed at the same time (Set speed will be cleared)
G Brake pedal is depressed G Clutch pedal is depressed or gear position is changed to the neutral position (M/T models) G Selector lever is changed to N, P, R position (A/T models)
G Vehicle speed decreased to 13 km/h (8 MPH) lower than the set speed When the ECM detects any of the following conditions, the ECM will cancel the cruise operation and inform the driver by blinking indicator lamp.
G Engine coolant temperature is slightly higher than the normal operating temperature, CRUISE lamp may blink slowly. When the engine coolant temperature decreases to the normal operating temperature, CRUISE lamp will stop blinking and the cruise operation will be able to work by pressing SET/COAST switch or RESUME/ ACCELERATE switch.
G Malfunction for some self-diagnoses regarding ASCD control: SET lamp will blink quickly.

COAST OPERATION
When the SET/COAST switch is pressed during cruise control driving, decrease vehicle set speed until the switch is released. And then ASCD will keep the new set speed.

Revision: December 2006

EC-32

2006 Sentra

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

[QG18DE]

RESUME OPERATION When the RESUME/ACCELERATE switch is pressed after cancel operation other than pressing MAIN switch A is performed, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition must meet following conditions.

G Brake pedal is released.

EC

G Clutch pedal is released (M/T models)

G A/T selector lever is in other than P and N positions (A/T models)

G Vehicle speed is greater than 40 km/h (25 MPH) and less than 144 km/h (89 MPH)

C

Component Description
ASCD STEERING SWITCH
Refer to EC-468 .

UBS00JRQ
D

ASCD BRAKE SWITCH

Refer to EC-475 and EC-550 .

E

ASCD CLUTCH SWITCH

Refer to EC-475 and EC-550 .

F

STOP LAMP SWITCH

Refer to EC-475 , EC-489 and EC-550 .

ELECTRIC THROTTLE CONTROL ACTUATOR

G

Refer to EC-500 , EC-507 and EC-512 .

ASCD INDICATOR

H

Refer to EC-560 .

I

J

K

L

M

Revision: December 2006

EC-33

2006 Sentra

CAN COMMUNICATION

[QG18DE]

CAN COMMUNICATION

PFP:23710

System Description

UBS00JRR

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only. Refer to LAN-14 , about CAN communication for detail.

Revision: December 2006

EC-34

2006 Sentra

EVAPORATIVE EMISSION SYSTEM
EVAPORATIVE EMISSION SYSTEM Description
SYSTEM DESCRIPTION

[QG18DE]
PFP:14950
A
UBS00JRS
EC

C

D

E

F

G

PBIB2508E

The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel

system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.

H

The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the

vapor is stored there when the engine is not operating or when refueling to the fuel tank.

The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the I

engine operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is

proportionally regulated as the air flow increases.

EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating.

J

K

L

M

Revision: December 2006

EC-35

2006 Sentra

EVAPORATIVE EMISSION SYSTEM
EVAPORATIVE EMISSION LINE DRAWING

[QG18DE]

Revision: December 2006

EC-36

BBIA0524E
2006 Sentra

EVAPORATIVE EMISSION SYSTEM

[QG18DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-37

BBIA0294E
2006 Sentra

EVAPORATIVE EMISSION SYSTEM
Component Inspection
EVAP CANISTER Check EVAP canister as follows: 1. Block port B . 2. Blow air into port A and check that it flows freely out of port C . 3. Release blocked port B . 4. Apply vacuum pressure to port B and check that vacuum pres-
sure exists at the ports A and C . 5. Block port A and B . 6. Apply pressure to port C and check that there is no leakage.
FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FULLER CAP) 1. Wipe clean valve housing.

[QG18DE]
UBS00JRT
PBIB1212E

2. Check valve opening pressure and vacuum.

Pressure: Vacuum:

15.3 - 20.0 kPa (0.156 - 0.204 kg/cm2 , 2.22 - 2.90 psi)
-6.0 to -3.4 kPa (-0.061 to -0.035 kg/cm2 , -0.87 to -0.48 psi)

3. If out of specification, replace fuel filler cap as an assembly.
CAUTION: Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may come on.

EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE Refer toEC-367

FUEL TANK TEMPERATURE SENSOR Refer to EC-297 .

EVAP CANISTER VENT CONTROL VALVE Refer to EC-374 .

EVAP CONTROL SYSTEM PRESSURE SENSOR Refer to EC-386 .

SEF445Y SEF943S

Revision: December 2006

EC-38

2006 Sentra

EVAPORATIVE EMISSION SYSTEM
EVAP SERVICE PORT Positive pressure is delivered to the EVAP system through the EVAP service port. If fuel vapor leakage in the EVAP system occurs, use a leak detector to locate the leak.
Removal and Installation
EVAP CANISTER Tighten EVAP canister as shown in the figure.
EVAP CANISTER VENT CONTROL VALVE 1. Turn EVAP canister vent control valve counterclockwise. 2. Remove the EVAP canister vent control valve. Do not reuse the O-ring, replace it with a new one.

[QG18DE]
A EC
C D
BBIA0517E UBS0 0JR U
E
F G H I J K
PBIB1214E
L M

How to Detect Fuel Vapor Leakage
CAUTION: G Never use compressed air or a high pressure pump. G Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pressure in EVAP system. NOTE: G Do not start engine. G Improper installation of EVAP service port adapter to the EVAP service port may cause a leak.

PBIB3082E UBS00JRV

Revision: December 2006

EC-39

2006 Sentra

EVAPORATIVE EMISSION SYSTEM
WITH CONSULT-II 1. Attach the EVAP service port adapter securely to the EVAP service port. 2. Also attach the pressure pump and hose to the EVAP service port adapter. 3. Turn ignition switch ON. 4. Select the "EVAP SYSTEM CLOSE" of "WORK SUPPORT
MODE" with CONSULT-II. 5. Touch "START". A bar graph (Pressure indicating display) will
appear on the screen.
6. Apply positive pressure to the EVAP system until the pressure indicator reaches the middle of the bar graph.
7. Remove EVAP service port adapter and hose with pressure pump.
8. Locate the leak using a leak detector. Refer to EC-36, "EVAPORATIVE EMISSION LINE DRAWING" .

[QG18DE]
PEF838U PEF917U

WITHOUT CONSULT-II 1. Attach the EVAP service port adapter securely to the EVAP ser-
vice port.
2. Also attach the pressure pump with pressure gauge to the EVAP service port adapter.

Revision: December 2006

EC-40

SEF200U SEF462UC
2006 Sentra

EVAPORATIVE EMISSION SYSTEM
3. Apply battery voltage to between the terminals of both EVAP canister vent control valve to make a closed EVAP system.
4. To locate the leak, deliver positive pressure to the EVAP system until pressure gauge points reach 1.38 to 2.76 kPa (0.014 to 0.028 kg/cm2 , 0.2 to 0.4 psi).
5. Remove EVAP service port adapter and hose with pressure pump.
6. Locate the leak using a leak detector. Refer to EC-36, "EVAPORATIVE EMISSION LINE DRAWING" .

[QG18DE]
A EC
C
BBIA0157E
D E F G H I J K L M

Revision: December 2006

EC-41

2006 Sentra

ON BOARD REFUELING VAPOR RECOVERY (ORVR)
ON BOARD REFUELING VAPOR RECOVERY (ORVR) System Description

[QG18DE]
PFP:00032
UBS00JRW

PBIB1268E
From the beginning of refueling, the fuel tank pressure goes up. When the pressure reaches the setting value of the refueling control valve (RCV) opening pressure, the RCV is opened. After RCV opens, the air and vapor inside the fuel tank go through refueling EVAP vapor cut valve, RCV and EVAP/ORVR line to the EVAP canister. The vapor is absorbed by the EVAP canister and the air is released to the atmosphere. When the refueling has reached the full level of the fuel tank, the refueling EVAP vapor cut valve is closed and refueling is stopped because of auto shut-off. The vapor which was absorbed by the EVAP canister is purged during driving. The RCV is always closed during driving and the evaporative emission control system is operated the same as conventional system.
WARNING: When conducting inspections below, be sure to observe the following:
G Put a "CAUTION: INFLAMMABLE" sign in workshop.
G Do not smoke while servicing fuel system. Keep open flames and sparks away from work area.
G Be sure to furnish the workshop with a CO2 fire extinguisher.
CAUTION: G Before removing fuel line parts, carry out the following procedures:
­ Put drained fuel in an explosion-proof container and put lid on securely.
­ Release fuel pressure from fuel line. Refer to EC-82, "FUEL PRESSURE RELEASE" .
­ Disconnect battery ground cable.
G Always replace O-ring when the fuel gauge retainer is removed.
G Do not kink or twist hose and tube when they are installed.
G Do not tighten hose and clamps excessively to avoid damaging hoses.
G After installation, run engine and check for fuel leaks at connection.
G Do not attempt to top off the fuel tank after the fuel pump nozzle shuts off automatically. Continued refueling may cause fuel overflow, resulting in fuel spray and possibly a fire.

Revision: December 2006

EC-42

2006 Sentra

ON BOARD REFUELING VAPOR RECOVERY (ORVR)
Diagnostic Procedure
SYMPTOM: FUEL ODOR FROM EVAP CANISTER IS STRONG.
1. CHECK EVAP CANISTER

[QG18DE]
UBS00JRX
A

1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor EC attached.

2. Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor

attached.

C

The weight should be less than 1.9 kg (4.2 lb).

OK or NG

OK >> GO TO 2.

D

NG >> GO TO 3.

2. CHECK IF EVAP CANISTER SATURATED WITH WATER

E

Does water drain from the EVAP canister?

Yes or No

Yes >> GO TO 3.

F

No >> GO TO 5.

G

H

3. REPLACE EVAP CANISTER

PBIB1213E
I

Replace EVAP canister with a new one.

J >> GO TO 4.

4. DETECT MALFUNCTIONING PART

K

Check the EVAP hose between EVAP canister and vehicle frame for clogging or poor connection.

>> Repair or replace EVAP hose.

L

5. CHECK REFUELING CONTROL VALVE
M Refer to EC-47, "REFUELING CONTROL VALVE" .
OK or NG
OK >> GO TO 6. NG >> Replace refueling control valve.

6. CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to EC-46, "REFUELING EVAP VAPOR CUT VALVE" .
OK or NG OK >> INSPECTION END NG >> Replace refueling EVAP vapor cut valve with fuel tank.

Revision: December 2006

EC-43

2006 Sentra

ON BOARD REFUELING VAPOR RECOVERY (ORVR)
[QG18DE]
SYMPTOM: CANNOT REFUEL/FUEL ODOR FROM THE FUEL FILLER OPENING IS STRONG WHILE REFUELING.
1. CHECK EVAP CANISTER
1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
2. Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached. The weight should be less than 1.9 kg (4.2 lb).
OK or NG OK >> GO TO 2. NG >> GO TO 3.
2. CHECK IF EVAP CANISTER SATURATED WITH WATER
Does water drain from the EVAP canister? Yes or No
Yes >> GO TO 3. No >> GO TO 5.

3. REPLACE EVAP CANISTER
Replace EVAP canister with a new one.

PBIB1213E

>> GO TO 4.
4. DETECT MALFUNCTIONING PART
Check the EVAP hose between EVAP canister and vehicle frame for clogging or poor connection.

>> Repair or replace EVAP hose.
5. CHECK VENT HOSES AND VENT TUBES
Check hoses and tubes between EVAP canister and refueling EVAP vapor cut valve for clogging, kink, looseness and improper connection. OK or NG
OK >> GO TO 6. NG >> Repair or replace hoses and tubes.
6. CHECK FILLER NECK TUBE
Check signal line and recirculation line for clogging, dents and cracks. OK or NG
OK >> GO TO 7. NG >> Replace filler neck tube.

Revision: December 2006

EC-44

2006 Sentra

ON BOARD REFUELING VAPOR RECOVERY (ORVR)
7. CHECK REFUELING CONTROL VALVE
Refer to EC-47, "REFUELING CONTROL VALVE" . OK or NG
OK >> GO TO 8. NG >> Replace refueling control valve.
8. CHECK REFUELING EVAP VAPOR CUT VALVE
Refer to EC-47, "REFUELING CONTROL VALVE" . OK or NG
OK >> GO TO 9. NG >> Replace refueling EVAP vapor cut valve with fuel tank.
9. CHECK FUEL FILLER TUBE
Check filler neck tube and hose connected to the fuel tank for clogging, dents and cracks. OK or NG
OK >> GO TO 10. NG >> Replace fuel filler tube.
10. CHECK ONE-WAY FUEL VALVE-I
Check one-way valve for clogging. OK or NG
OK >> GO TO 11. NG >> Repair or replace one-way fuel valve with fuel tank.
11. CHECK ONE-WAY FUEL VALVE-II
1. Make sure that fuel is drained from the tank. 2. Remove fuel filler tube and hose. 3. Check one-way fuel valve for operation as follows.
When a stick is inserted, the valve should open, when removing stick it should close. Do not drop any material into the tank. OK or NG OK >> INSPECTION END NG >> Replace fuel filler tube or replace one-way fuel valve
with fuel tank.

[QG18DE]
A EC
C D E F G H I J K L M
SEF665U

Revision: December 2006

EC-45

2006 Sentra

ON BOARD REFUELING VAPOR RECOVERY (ORVR)
[QG18DE]

Component Inspection
REFUELING EVAP VAPOR CUT VALVE

UBS00JRY

With CONSULT-II

1. Remove fuel tank. Refer to FL-7, "FUEL TANK" .

2. Drain fuel from the tank as follows:

a. Remove fuel feed hose located on the fuel level sensor unit retainer.

b. Connect a spare fuel hose, one side to fuel level sensor unit retainer where the hose was removed and the other side to a fuel container.

c. Drain fuel using "FUEL PUMP RELAY" in "ACTIVE TEST" mode with CONSULT-II.

3. Check refueling EVAP vapor cut valve for being stuck to close as follows. Blow air into the refueling EVAP vapor cut valve (from the hose end B), and check that the air flows freely into the tank.

4. Check refueling EVAP vapor cut valve for being stuck to open as follows.

a. Connect vacuum pump to hose ends A and B using suitable 3-way connector.

b. Remove fuel level sensor unit retainer with fuel level sensor unit. Always replace O-ring with new one.

c. Put fuel tank upside down.

d. Apply vacuum pressure to both hose ends A and B [-13.3 kPa (-100 mmHg, -3.94 inHg)] with fuel level sensor unit retainer remaining open and check that the pressure is applicable.

BBIA0295E
Without CONSULT-II 1. Remove fuel tank. Refer to FL-7, "FUEL TANK" . 2. Drain fuel from the tank as follows: a. Remove fuel level sensor unit retainer. b. Drain fuel from the tank using a handy pump into a fuel container. 3. Check refueling EVAP vapor cut valve for being stuck to close as follows.
Blow air into the refueling EVAP vapor cut valve (from hose end B), and check that the air flows freely into the tank. 4. Check EVAP vapor cut valve for being stuck to open as follows. a. Connect vacuum pump to hose ends A and B using a suitable 3-way connector. b. Remove fuel level sensor unit retainer with fuel level sensor unit. Always replace O-ring with new one. c. Put fuel tank upside down.

Revision: December 2006

EC-46

2006 Sentra

ON BOARD REFUELING VAPOR RECOVERY (ORVR)
[QG18DE]

d. Apply vacuum pressure to both hose ends A and B [-13.3 kPa (-100 mmHg, -3.94 inHg)] with fuel level

sensor unit retainer remaining open and check that the pressure is applicable.

A

EC

C

D

E

F

REFUELING CONTROL VALVE

BBIA0295E

G

1. Remove fuel filler cap.

2. Check air continuity between hose ends A and B.

H

Blow air into the hose end B. Air should flow freely into the fuel tank.

3. Blow air into hose end A and check there is no leakage.

4. Apply pressure to both hose ends A and B [20 kPa (150 mmHg, 5.91 inHg)] using a pressure pump and a I suitable 3-way connector. Check that there is no leakage.

J

K

L

M

BBIA0295E

Revision: December 2006

EC-47

2006 Sentra

POSITIVE CRANKCASE VENTILATION
POSITIVE CRANKCASE VENTILATION Description
SYSTEM DESCRIPTION

[QG18DE]
PFP:11810
UBS00JRZ

PBIB0492E
This system returns blow-by gas to the intake collector. The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake manifold. During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the PCV valve. Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of ventilating air. The ventilating air is then drawn from the air inlet tubes into the crankcase. In this process the air passes through the hose connecting air inlet tubes to rocker cover. Under full-throttle condition, the manifold vacuum is insufficient to draw the blow-by flow through the valve. The flow goes through the hose connection in the reverse direction. On vehicles with an excessively high blow-by, the valve does not meet the requirement. This is because some of the flow will go through the hose connection to the air inlet tubes under all conditions.

Component Inspection
PCV (POSITIVE CRANKCASE VENTILATION) VALVE
With engine running at idle, remove PCV valve from rocker cover. A properly working valve makes a hissing noise as air passes through it. A strong vacuum should be felt immediately when a finger is placed over valve inlet.

PBIB1588E UBS00JS0

Revision: December 2006

EC-48

PBIB1589E
2006 Sentra

POSITIVE CRANKCASE VENTILATION
PCV VALVE VENTILATION HOSE 1. Check hoses and hose connections for leaks. 2. Disconnect all hoses and clean with compressed air. If any hose
cannot be freed of obstructions, replace.

[QG18DE]
A EC
C D
S-ET277
E F G H I J K L M

Revision: December 2006

EC-49

2006 Sentra

NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)
[QG18DE]

NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)

PFP:25386

Description

UBS00JS1

G If the security indicator lights up with the ignition switch in the ON position or "NATS MALFUNCTION" is displayed on "SELF-DIAG RESULTS" screen, perform self-diagnostic results mode with CONSULT-II using NATS program card. Refer to BL-96, "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM -- NATS)" .

G Confirm no self-diagnostic results of NVIS (NATS) is displayed before touching "ERASE" in "SELF-DIAG RESULTS" mode with CONSULT-II.

G When replacing ECM, initialization of NVIS (NATS) system

and registration of all NVIS (NATS) ignition key IDs must be

SEF543X

carried out with CONSULT-II using NATS program card.

Therefore, be sure to receive all keys from vehicle owner. Regarding the procedures of NVIS

(NATS) initialization and all NVIS (NATS) ignition key ID registration, refer to CONSULT-II operation

manual, IVIS/NVIS.

Revision: December 2006

EC-50

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM Introduction

PFP:00028
A
UBS00JS2

The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actua-

tors. The ECM also records various emission-related diagnostic information including:

EC

Emission-related diagnostic information

Diagnostic service

Diagnostic Trouble Code (DTC) Freeze Frame data

Service $03 of SAE J1979

Service $02 of SAE J1979

C

System Readiness Test (SRT) code

Service $01 of SAE J1979

1st Trip Diagnostic Trouble Code (1st Trip DTC) 1st Trip Freeze Frame data

Service $07 of SAE J1979

D

Test values and Test limits Calibration ID

Service $06 of SAE J1979

Service $09 of SAE J1979

E

The above information can be checked using procedures listed in the table below.

DTC

1st trip DTC

Freeze Frame data

1st trip Freeze Frame data

×: Applicable --: Not applicable
F

SRT status

SRT code

Test value

CONSULT-II

×

×

×

×

×

×

--

G

GST

×

×

×

--

×

×

×

ECM

×

×*

--

--

×

--

--

*: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.

H

The malfunction indicator lamp (MIL) on the instrument panel lights up when the same malfunction is detected

in two consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to EC-93 .) I

Two Trip Detection Logic

UBS00JS3

When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in the

ECM memory. The MIL will not light up at this stage. <1st trip>

J

If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in

the ECM memory, and the MIL lights up. The MIL lights up at the same time when the DTC is stored. <2nd

trip> The "trip" in the "Two Trip Detection Logic" means a driving mode in which self-diagnosis is performed K during vehicle operation. Specific on board diagnostic items will cause the ECM to light up or blink the MIL,

and store DTC and Freeze Frame data, even in the 1st trip, as shown below.

×: Applicable --: Not applicable

L

MIL

DTC

1st trip DTC

Items

1st trip

Blinking

Lighting up

2nd trip

Blinking

Lighting up

1st trip 2nd trip 1st trip displaying displaying displaying

2nd trip display-
ing

M

Misfire (Possible three way cata-

lyst damage) -- DTC: P0300 -

×

--

--

--

--

--

×

--

P0304 is being detected

Misfire (Possible three way cata-

lyst damage) -- DTC: P0300 -

--

--

×

--

--

×

--

--

P0304 is being detected

One trip detection diagnoses (Refer to EC-52 .)

--

×

--

--

×

--

--

--

Except above

--

--

--

×

--

×

×

--

When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when there is malfunction on engine control system. Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means of operating fail-safe function.

Revision: December 2006

EC-51

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

The fail-safe function also operates when above diagnoses except MIL circuit are detected, and demands the driver to repair the malfunction.

Engine operating condition in fail-safe mode

Engine speed will not rise more than 2,500 rpm due to the fuel cut

Emission-related Diagnostic Information
EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS

UBS00JS4
×: Applicable --: Not applicable

Items (CONSULT-II screen terms)
CAN COMM CIRCUIT CAN COMM CIRCUIT

DTC*1

CONSULT-II GST*2

ECM*3

U1000

1000*6

U1001

1001*6

CONTROL UNIT(CAN)

U1010

1010

NO DTC IS DETECTED. FURTHER TESTING MAY BE REQUIRED. INT/V TIM CONT-B1 A/F SEN1 HTR (B1) A/F SEN1 HTR (B1) HO2S2 HTR (B1) HO2S2 HTR (B1) INT/V TIM V/CIR-B1 MAF SEN/CIRCUIT MAF SEN/CIRCUIT MAF SEN/CIRCUIT IAT SEN/CIRCUIT IAT SEN/CIRCUIT ECT SEN/CIRC ECT SEN/CIRC TP SEN 2/CIRC TP SEN 2/CIRC ECT SENSOR IAT SENSOR THERMSTAT FNCTN A/F SENSOR1 (B1) A/F SENSOR1 (B1) A/F SENSOR1 (B1) A/F SENSOR1 (B1) HO2S2 (B1) HO2S2 (B1) HO2S2 (B1) FUEL SYS-LEAN-B1 FUEL SYS-RICH-B1 FTT SENSOR FTT SEN/CIRCUIT FTT SEN/CIRCUIT TP SEN 1/CIRC

P0000
P0011 P0031 P0032 P0037 P0038 P0075 P0101 P0102 P0103 P0112 P0113 P0117 P0118 P0122 P0123 P0125 P0127 P0128 P0130 P0131 P0132 P0133 P0137 P0138 P0139 P0171 P0172 P0181 P0182 P0183 P0222

0000
0011 0031 0032 0037 0038 0075 0101 0102 0103 0112 0113 0117 0118 0122 0123 0125 0127 0128 0130 0131 0132 0133 0137 0138 0139 0171 0172 0181 0182 0183 0222

SRT code

Test value/ Test limit (GST only)

--

--

--

--

--

--

--

--

--

--

--

×

--

×

--

×

--

×

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

×

--

×

--

×

×

×

×

×

--

×

×

×

--

--

--

--

--

--

--

--

--

--

--

--

Trip
1 2 1 (A/T) 2 (M/T)
--
2 2 2 2 2 2 2 1 1 2 2 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1

MIL lighting Reference

up

page

×
-- × (A/T) -- (M/T)

EC-152 EC-152 EC-155

Flashing*7

EC-65

×

EC-157

×

EC-161

×

EC-161

×

EC-166

×

EC-166

×

EC-172

×

EC-177

×

EC-186

×

EC-186

×

EC-194

×

EC-194

×

EC-199

×

EC-199

×

EC-205

×

EC-205

×

EC-212

×

EC-215

×

EC-218

×

EC-220

×

EC-227

×

EC-234

×

EC-241

×

EC-251

×

EC-259

×

EC-269

×

EC-277

×

EC-285

×

EC-293

×

EC-298

×

EC-298

×

EC-302

Revision: December 2006

EC-52

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Items (CONSULT-II screen terms)
TP SEN 1/CIRC MULTI CYL MISFIRE CYL 1 MISFIRE CYL 2 MISFIRE CYL 3 MISFIRE CYL 4 MISFIRE KNOCK SEN/CIRC-B1 KNOCK SEN/CIRC-B1 CKP SEN/CIRCUIT CMP SEN/CIRC-B1 TW CATALYST SYS-B1 EVAP PURG FLOW/MON EVAP SMALL LEAK PURG VOLUME CONT/V PURG VOLUME CONT/V PURG VOLUME CONT/V VENT CONTROL VALVE VENT CONTROL VALVE EVAP SYS PRES SEN EVAP SYS PRES SEN EVAP SYS PRES SEN EVAP GROSS LEAK EVAP VERY SML LEAK FUEL LEV SEN SLOSH FUEL LEVEL SENSOR FUEL LEVL SEN/CIRC FUEL LEVL SEN/CIRC VEH SPEED SEN/CIRC*5 ISC SYSTEM ISC SYSTEM PW STP SEN/CIRC ECM BACK UP/CIRC ECM SENSOR POWER/CIRC PNP SW/CIRC ATF TEMP SEN/CIRC VEH SPD SEN/CIR AT*5 ENGINE SPEED SIG A/T 1ST GR FNCTN A/T 2ND GR FNCTN A/T 3RD GR FNCTN A/T 4TH GR FNCTN

DTC*1

CONSULT-II GST*2

ECM*3

P0223

0223

P0300

0300

P0301

0301

P0302

0302

P0303

0303

P0304

0304

P0327

0327

P0328

0328

P0335

0335

P0340

0340

P0420 P0441

0420 0441

P0442 P0443

0442 0443

P0444

0444

P0445

0445

P0447

0447

P0448

0448

P0451

0451

P0452

0452

P0453

0453

P0455

0455

P0456

0456

P0460

0460

P0461

0461

P0462

0462

P0463

0463

P0500

0500

P0506

0506

P0507

0507

P0550 P0603

0550 0603

P0605 P0643

0605 0643

P0705

0705

P0710

0710

P0720

0720

P0725

0725

P0731

0731

P0732

0732

P0733

0733

P0734

0734

SRT code
-- -- -- -- -- -- -- -- -- -- × × × -- -- -- -- -- -- -- -- -- ×*4 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

Test value/ Test limit (GST only)
-- -- -- -- -- -- -- -- -- -- × × × -- -- -- -- -- -- -- -- -- × -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

Revision: December 2006

EC-53

Trip
1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1 or 2 1 2 2 2 2 2 2 2 2

[QG18DE]

MIL lighting Reference A

up

page

× × × × × × -- -- × × × × × × × × × × × × × × × × × × × × × × -- × × or -- × × × × × × × × ×

EC-302 EC
EC-309

EC-309

EC-309

C

EC-309

EC-309

D

EC-316

EC-316

EC-321

E

EC-328

EC-335
F
EC-340

EC-346

EC-354

G

EC-362

EC-362
H
EC-369

EC-376

EC-384

I

EC-387

EC-393

EC-400

J

EC-407

EC-416

K

EC-418

EC-420

EC-420

L

EC-422

EC-424

M

EC-426

EC-428

EC-433

EC-437

EC-440

AT-114

AT-119

AT-125

AT-130

AT-134

AT-139

AT-144

AT-149

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

Items (CONSULT-II screen terms)

DTC*1

CONSULT-II GST*2

ECM*3

SRT code

Test value/ Test limit (GST only)

Trip

MIL lighting Reference

up

page

TCC SOLENOID/CIRC

P0740

0740

--

--

2

A/T TCC S/V FNCTN

P0744

0744

--

--

2

L/PRESS SOL/CIRC

P0745

0745

--

--

2

SFT SOL A/CIRC

P0750

0750

--

--

1

SFT SOL B/CIRC

P0755

0755

--

--

1

P-N POS SW/CIRCUIT

P0850

0850

--

--

2

CLOSED LOOP-B1

P1148

1148

--

--

1

ENG OVER TEMP

P1217

1217

--

--

1

×

AT-158

×

AT-162

×

AT-172

×

AT-178

×

AT-182

×

EC-445

×

EC-449

×

EC-450

CTP LEARNING

P1225

1225

--

--

2

--

EC-464

CTP LEARNING

P1226

1226

--

--

2

--

EC-466

ASCD SW ASCD BRAKE SW

P1564

1564

--

--

1

P1572

1572

--

--

1

--

EC-468

--

EC-475

ASCD VHL SPD SEN

P1574

1574

--

--

1

NATS MALFUNCTION

P1610 P1615

1610 - 1615

--

--

2

TPV SEN/CIRC A/T

P1705

1705

--

--

1

O/R CLTCH SOL/CIRC

P1760

1760

--

--

2

--

EC-487

--

BL-96

×

AT-186

×

AT-192

BRAKE SW/CIRCUIT

P1805

1805

--

--

2

--

EC-489

ETC MOT PWR

P2100

2100

--

--

1

×

EC-494

ETC FUNCTION/CIRC

P2101

2101

--

--

1

×

EC-500

ETC MOT PWR

P2103

2103

--

--

1

×

EC-494

ETC MOT

P2118

2118

--

--

1

×

EC-507

ETC ACTR

P2119

2119

--

--

1

×

EC-512

APP SEN 1/CIRC

P2122

2122

--

--

1

×

EC-514

APP SEN 1/CIRC

P2123

2123

--

--

1

×

EC-514

APP SEN 2/CIRC

P2127

2127

--

--

1

×

EC-521

APP SEN 2/CIRC

P2128

2128

--

--

1

×

EC-521

TP SENSOR

P2135

2135

--

--

1

×

EC-528

APP SENSOR

P2138

2138

--

--

1

×

EC-535

A/F SENSOR1 (B1)

P2A00

2A00

--

×

2

×

EC-543

*1: 1st trip DTC No. is the same as DTC No. *2: This number is prescribed by SAE J2012. *3: In Diagnostic Test Made II (Self-diagnostic results), this number is controlled by NISSAN. *4: SRT code will not be set if the self-diagnostic result is NG. *5: When the fail-safe operations for both self-diagnoses occur at the same time, the MIL illuminates. *6: The troubleshooting for this DTC needs CONSULT-II. *7: When the ECM is in the mode of displaying SRT status, MIL may flash. For the details, refer to EC-58, "How to Display SRT Status" .

DTC AND 1ST TRIP DTC
The 1st trip DTC (whose number is the same as the DTC number) is displayed for the latest self-diagnostic result obtained. If the ECM memory was cleared previously, and the 1st trip DTC did not reoccur, the 1st trip DTC will not be displayed. If a malfunction is detected during the 1st trip, the 1st trip DTC is stored in the ECM memory. The MIL will not light up (two trip detection logic). If the same malfunction is not detected in the 2nd trip (meeting the required driving pattern), the 1st trip DTC is cleared from the ECM memory. If the same malfunction is detected in the 2nd trip, both the 1st trip DTC and DTC are stored in the ECM memory and the MIL lights up. In other words, the DTC is stored in the ECM memory and the MIL lights up when the same malfunction occurs in two consec-

Revision: December 2006

EC-54

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

utive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and 2nd

trips, only the 1st trip DTC will continue to be stored. For malfunctions that blink or light up the MIL during the A

1st trip, the DTC and 1st trip DTC are stored in the ECM memory.

Procedures for clearing the DTC and the 1st trip DTC from the ECM memory are described in EC-63, "HOW

TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" . For malfunctions in which 1st trip DTCs are displayed, refer to EC-52, "EMISSION-RELATED DIAGNOSTIC

EC

INFORMATION ITEMS" . These items are required by legal regulations to continuously monitor the system/

component. In addition, the items monitored non-continuously are also displayed on CONSULT-II.

1st trip DTC is specified in Service $07 of SAE J1979. 1st trip DTC detection occurs without lighting up the MIL C

and therefore does not warn the driver of a malfunction. However, 1st trip DTC detection will not prevent the

vehicle from being tested, for example during Inspection/Maintenance (I/M) tests.

When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame data as specified in Work Flow procedure Step II, refer to EC-86, "WORK FLOW" . Then perform DTC Confir-

D

mation Procedure or Overall Function Check to try to duplicate the malfunction. If the malfunction is dupli-

cated, the item requires repair.

E
How to Read DTC and 1st Trip DTC

DTC and 1st trip DTC can be read by the following methods.

WITH CONSULT-II

F

WITH GST

CONSULT-II or GST (Generic Scan Tool) Examples: P0340, P0850, P1148, etc.

These DTCs are prescribed by SAE J2012.

(CONSULT-II also displays the malfunctioning component or system.)

G

NO TOOLS

The number of blinks of the MIL in the Diagnostic Test Mode II (Self-Diagnostic Results) indicates the DTC.

Example: 0340, 0850, 1148, etc.

H

These DTCs are controlled by NISSAN.

G 1st trip DTC No. is the same as DTC No.

G Output of a DTC indicates a malfunction. However, GST or the Diagnostic Test Mode II do not indi- I

cate whether the malfunction is still occurring or has occurred in the past and has returned to nor-

mal. CONSULT-II can identify malfunction status as shown below. Therefore, using CONSULT-II (if

available) is recommended.

J

A sample of CONSULT-II display for DTC and 1st trip DTC is shown below. DTC or 1st trip DTC of a malfunc-

tion is displayed in SELF-DIAGNOSTIC RESULTS mode of CONSULT-II. Time data indicates how many times

the vehicle was driven after the last detection of a DTC.

If the DTC is being detected currently, the time data will be 0.

K

If a 1st trip DTC is stored in the ECM, the time data will be [1t].

L

M

PBIB0911E
FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA
The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant temperature, short term fuel trim, long term fuel trim, engine speed, vehicle speed, base fuel schedule and intake air temperature at the moment a malfunction is detected. Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data. The data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT-II or GST. The 1st trip freeze frame data can only be displayed on the CONSULT-II screen, not on the GST. For details, see EC-55, "FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA" . Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once

Revision: December 2006

EC-55

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the following priorities to update the data.

Priority

Items

1

Freeze frame data

Misfire -- DTC: P0300 - P0304 Fuel Injection System Function -- DTC: P0171, P0172

2

Except the above items (Includes A/T related items)

3

1st trip freeze frame data

For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was stored in the 2nd trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated from the EGR malfunction to the misfire. The 1st trip freeze frame data is updated each time a different malfunction is detected. There is no priority for 1st trip freeze frame data. However, once freeze frame data is stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or 1st trip freeze frame data can be stored in the ECM). If freeze frame data is stored in the ECM memory and freeze frame data with the same priority occurs later, the first (original) freeze frame data remains unchanged in the ECM memory. Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM memory is erased. Procedures for clearing the ECM memory are described in EC-52, "EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS" .

SYSTEM READINESS TEST (SRT) CODE
System Readiness Test (SRT) code is specified in Service $01 of SAE J1979. As part of an enhanced emissions test for Inspection & Maintenance (I/M), certain states require the status of SRT be used to indicate whether the ECM has completed self-diagnosis of major emission systems and components. Completion must be verified in order for the emissions inspection to proceed. If a vehicle is rejected for a State emissions inspection due to one or more SRT items indicating "INCMP", use the information in this Service Manual to set the SRT to "CMPLT". In most cases the ECM will automatically complete its self-diagnosis cycle during normal usage, and the SRT status will indicate "CMPLT" for each application system. Once set as "CMPLT", the SRT status remains "CMPLT" until the self-diagnosis memory is erased. Occasionally, certain portions of the self-diagnostic test may not be completed as a result of the customer's normal driving pattern; the SRT will indicate "INCMP" for these items.
NOTE: The SRT will also indicate "INCMP" if the self-diagnosis memory is erased for any reason or if the ECM memory power supply is interrupted for several hours. If, during the state emissions inspection, the SRT indicates "CMPLT" for all test items, the inspector will continue with the emissions test. However, if the SRT indicates "INCMP" for one or more of the SRT items the vehicle is returned to the customer untested.
NOTE: If MIL is ON during the state emissions inspection, the vehicle is also returned to the customer untested even though the SRT indicates "CMPLT" for all test items. Therefore, it is important to check SRT ("CMPLT") and DTC (No DTCs) before the inspection.

SRT Item The table below shows required self-diagnostic items to set the SRT to "CMPLT".

SRT item (CONSULT-II indication)

Performance Priority*

Required self-diagnostic items to set the SRT to "CMPLT"

Corresponding DTC No.

CATALYST

2

Three way catalyst function

P0420

EVAP SYSTEM

1

EVAP control system

P0442

2

EVAP control system

P0456

2

EVAP control system purge flow monitoring

P0441

HO2S

2

Air fuel ratio (A/F) sensor 1

P0133

Heated oxygen sensor 2

P0137

Heated oxygen sensor 2

P0138

Heated oxygen sensor 2

P0139

Revision: December 2006

EC-56

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

*: If completion of several SRTs is required, perform driving patterns (DTC confirmation procedure), one by one based on the priority for

models with CONSULT-II.

A

SRT Set Timing

SRT is set as "CMPLT" after self-diagnosis has been performed one or more times. Completion of SRT is done regardless of whether the result is OK or NG. The set timing is different between OK and NG results and EC is shown in the table below.

Self-diagnosis result

All OK

Case 1

Case 2

NG exists

Case 3

Diagnosis
P0400 P0402 P1402 SRT of EGR P0400 P0402 P1402 SRT of EGR P0400 P0402

P1402

(1st trip) DTC
SRT of EGR
OK: Self-diagnosis is carried out and the result is OK. NG: Self-diagnosis is carried out and the result is NG. --: Self-diagnosis is not carried out.

Example
C
Ignition cycle
 ON  OFF  ON  OFF  ON  OFF  ON 

OK (1) OK (1)

-- (1) -- (1)

OK (2) -- (1)

-- (2)
D
OK (2)

OK (1)

OK (2)

-- (2)

-- (2)

"CMPLT"

"CMPLT"

"CMPLT"

"CMPLT"

E

OK (1)

-- (1)

-- (1)

-- (1)

-- (0) OK (1)

-- (0) OK (2)

OK (1) -- (2)

-- (1)

-- (2)

F

"INCMP"

"INCMP"

"CMPLT"

"CMPLT"

OK

OK

--

--

--

--

--

G

--

NG

NG

--

NG

(Consecutive

H

NG)

1st trip DTC "INCMP"

-- "INCMP"

1st trip DTC

DTC (= MIL "ON")

I

"INCMP"

"CMPLT"

J

When all SRT related self-diagnoses showed OK results in a single cycle (Ignition OFF-ON-OFF), the SRT will

indicate "CMPLT".  Case 1 above

K

When all SRT related self-diagnoses showed OK results through several different cycles, the SRT will indicate

"CMPLT" at the time the respective self-diagnoses have at least one OK result.  Case 2 above

If one or more SRT related self-diagnoses showed NG results in 2 consecutive cycles, the SRT will also indicate "CMPLT".  Case 3 above

L

The table above shows that the minimum number of cycles for setting SRT as "INCMP" is one (1) for each

self-diagnosis (Case 1 & 2) or two (2) for one of self-diagnoses (Case 3). However, in preparation for the state

emissions inspection, it is unnecessary for each self-diagnosis to be executed twice (Case 3) for the following M

reasons:

G The SRT will indicate "CMPLT" at the time the respective self-diagnoses have one (1) OK result.

G The emissions inspection requires "CMPLT" of the SRT only with OK self-diagnosis results.

G When, during SRT driving pattern, 1st trip DTC (NG) is detected prior to "CMPLT" of SRT, the self-diagnosis memory must be erased from ECM after repair.

G If the 1st trip DTC is erased, all the SRT will indicate "INCMP".

NOTE: SRT can be set as "CMPLT" together with the DTC(s). Therefore, DTC check must always be carried out prior to the state emission inspection even though the SRT indicates "CMPLT".

SRT Service Procedure
If a vehicle has failed the state emissions inspection due to one or more SRT items indicating "INCMP", review the flowchart diagnostic sequence on the next page.

Revision: December 2006

EC-57

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

*1 EC-55

*2 EC-58

How to Display SRT Status
WITH CONSULT-II Selecting "SRT STATUS" in "DTC CONFIRMATION" mode with CONSULT-II. For items whose SRT codes are set, a "CMPLT" is displayed on the CONSULT-II screen; for items whose SRT codes are not set, "INCMP" is displayed. A sample of CONSULT-II display for SRT code is shown in the figure. "INCMP" means the self-diagnosis is incomplete and SRT is not set. "CMPLT" means the self-diagnosis is complete and SRT is set.

*3 EC-59

Revision: December 2006

EC-58

PBIB2320E
SEF935Z
2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM
NOTE: Though displayed on the CONSULT-II screen, "HO2S HTR" is not SRT item.
WITH GST Selecting Service $01 with GST (Generic Scan Tool).
NO TOOLS A SRT code itself can not be displayed while only SRT status can be. 1. Turn ignition switch ON and wait 20 seconds. 2. SRT status is indicated as shown below.
G When all SRT codes are set, MIL lights up continuously. G When any SRT codes are not set, MIL will flash periodically for 10 seconds.

[QG18DE]
A EC
C D

E

F

G

H

I

PBIB2317E

How to Set SRT Code

J

To set all SRT codes, self-diagnosis for the items indicated above must be performed one or more times. Each

diagnosis may require a long period of actual driving under various conditions.

WITH CONSULT-II

K

Perform corresponding DTC Confirmation Procedure one by one based on "Performance Priority" in the table

on EC-56, "SRT Item" .

WITHOUT CONSULT-II

L

The most efficient driving pattern in which SRT codes can be properly set is explained on the next page. The

driving pattern should be performed one or more times to set all SRT codes.

M

Revision: December 2006

EC-59

2006 Sentra

Driving Pattern

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

Revision: December 2006

EC-60

PBIB2906E
2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

G The time required for each diagnosis varies with road surface conditions, weather, altitude, individual driv-

ing habits, etc.

A

Zone A refers to the range where the time, required for the diagnosis under normal conditions*, is the

shortest.

Zone B refers to the range where the diagnosis can still be performed if the diagnosis is not completed within zone A.

EC

*: Normal conditions refer to the following:

G Sea level

C

G Flat road

G Ambient air temperature: 20 - 30°C (68 - 86°F)

G Diagnosis is performed as quickly as possible under normal conditions.

D

Under different conditions [For example: ambient air temperature other than 20 - 30°C (68 - 86°F)], diag-

nosis may also be performed.

Pattern 1:

E

G The engine is started at the engine coolant temperature of -10 to 35°C (14 to 95°F)

(where the voltage between the ECM terminal 73 and ground is 3.0 - 4.3V).

G The engine must be operated at idle speed until the engine coolant temperature is greater than F 70°C (158°F) (where the voltage between the ECM terminal 73 and ground is lower than 1.4V).

G The engine is started at the fuel tank temperature of warmer than 0°C (32°F) (where the voltage

between the ECM terminal 107 and ground is less than 4.1V).

G

Pattern 2:

G When steady-state driving is performed again even after it is interrupted, each diagnosis can be con-

ducted. In this case, the time required for diagnosis may be extended.

H

Pattern 3:

G The driving pattern outlined in *2 must be repeated at least 3 times.

Pattern 4:

I

G Tests are performed after the engine has been operated for at least 17 minutes.

G The accelerator pedal must be held very steady during steady-state driving.

G If the accelerator pedal is moved, the test must be conducted all over again.

J

*1: Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH), then release the accelerator pedal

and keep it released for more than 10 seconds. Depress the accelerator pedal until vehicle speed is 90 km/h

(56 MPH) again.

K

*2: Operate the vehicle in the following driving pattern.

1. Decelerate vehicle to 0 km/h (0 MPH) and let engine idle.

2. Repeat driving pattern shown below at least 10 times.

L

­ During acceleration, hold the accelerator pedal as steady as possible. M

SEF414S

Suggested Transmission Gear Position for A/T Models Set the selector lever in the D position with the overdrive switch turned ON. Suggested upshift speeds for M/T models Shown below are suggested vehicle speeds for shifting into a higher gear. These suggestions relate to fuel economy and vehicle performance. Actual upshift speeds will vary according to road conditions, the weather and individual driving habits.

For normal acceleration in low altitude areas [less than 1,219 m (4,000 ft)]:

For quick acceleration in low altitude areas and high attitude areas [over 1,219m (4,000 ft)]:

Gear change

ACCEL shift point km/h (MPH)

km/h (MPH)

1st to 2nd

24 (15)

24 (15)

Revision: December 2006

EC-61

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

2nd to 3rd 3rd to 4th 4th to 5th

For normal acceleration in low altitude areas [less than 1,219 m (4,000 ft)]: 40 (25) 65 (40) 75 (45)

For quick acceleration in low altitude areas and high attitude areas [over 1,219m (4,000 ft)]: 40 (25) 65 (40) 75 (45)

Suggested Maximum Speed in Each Gear Downshift to a lower gear if the engine is not running smoothly, or if you need to accelerate. Do not exceed the maximum suggested speed (shown below) in any gear. For level road driving, use the highest gear suggested for that speed. Always observe posted speed limits and drive according to the road conditions to ensure safe operation. Do not over-rev the engine when shifting to a lower gear as it may cause engine damage or loss of vehicle control.

Gear 1st 2nd 3rd 4th 5th

km/h (MPH) 50 (30) 90 (55) 130 (80) -- --

TEST VALUE AND TEST LIMIT (GST ONLY -- NOT APPLICABLE TO CONSULT-II)
The following is the information specified in Service $06 of SAE J1979. The test value is a parameter used to determine whether a system/circuit diagnostic test is "OK" or "NG" while being monitored by the ECM during self-diagnosis. The test limit is a reference value which is specified as the maximum or minimum value and is compared with the test value being monitored. These data (test value and test limit) are specified by Test ID (TID) and Component ID (CID) and can be displayed on the GST screen.

Item CATALYST
EVAP SYSTEM
HO2S
HO2S HEATER

Self-diagnostic test item

Test value (GST display)

DTC

TID

CID

Three way catalyst function

P0420

01H

01H

P0420

02H

81H

EVAP control system (Small leak)

P0442

05H

03H

EVAP control system purge flow monitoring P0441

06H

83H

EVAP control system (Very small leak)

P0456

07H

03H

P0131

41H

8EH

P0132

42H

0EH

P2A00

43H

0EH

Air fuel ratio (A/F) sensor 1

P2A00

44H

8EH

P0133

45H

8EH

P0130

46H

0EH

P0130

47H

8EH

P0133

48H

8EH

P0139

19H

86H

Heated oxygen sensor 2

P0137

1AH

86H

P0138

1BH

06H

P0138

1CH

06H

A/F sensor 1 heater

P0032

57H

10H

P0031

58H

90H

P0038

2DH

0AH

Heated oxygen sensor 2 heater

P0037

2EH

8AH

Test limit
Max. Min. Max. Min. Max. Min. Max. Max. Min. Min. Max. Min. Min. Min. Min. Max. Max. Max. Min. Max. Min.

Conversion
1/128 1
1/128 mm2 20 mV
1/128 mm2 5mV 5mV 0.002 0.002 0.002 5mV 5mV 0.002
10mV/500 ms 10 mV 10 mV 10mV 5 mV 5 mV 20 mV 20 mV

Revision: December 2006

EC-62

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION

How to Erase DTC

A

With CONSULT-II

The emission related diagnostic information in the ECM can be erased by selecting "ERASE" in the "SELF-

DIAG RESULTS" mode with CONSULT-II.

EC

If DTCs are displayed for both ECM and TCM (Transmission control module), they need to be erased individu-

ally from the ECM and TCM (Transmission control module).

NOTE:

C

If the DTC is not for A/T related items (see EC-14, "INDEX FOR DTC" ), skip steps 2 through 4.

1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10

seconds and then turn it ON (engine stopped) again.

D

2. Turn CONSULT-II ON and touch "A/T".

3. Touch "SELF-DIAG RESULTS".

4. Touch "ERASE". [The DTC in the TCM (Transmission control module) will be erased.] Then touch "BACK" E twice.

5. Touch "ENGINE".

6. Touch "SELF-DIAG RESULTS".

F

7. Touch "ERASE". (The DTC in the ECM will be erased.)

G

H

I

J

K

L

M

SCIA5671E
With GST The emission related diagnostic information in the ECM can be erased by selecting Service $04 with GST.
NOTE: If the DTC is not for A/T related items (see EC-14, "INDEX FOR DTC" , skip step 2.
1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10 seconds and then turn it ON (engine stopped) again.

Revision: December 2006

EC-63

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

2. Perform AT-41, "HOW TO ERASE DTC (WITH GST)" . (The DTC in the TCM will be erased.) 3. Select "Service $04" with GST (Generic Scan Tool).

No Tools NOTE: If the DTC is not for A/T related items (see EC-14, "INDEX FOR DTC" ), skip step 2. 1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once.
Wait at least 10 seconds and then turn it ON (engine stopped) again. 2. Perform AT-41, "HOW TO ERASE DTC (NO TOOLS)" . (The DTC in the TCM will be erased.) 3. Change the diagnostic test mode from Mode II to Mode I by depressing the accelerator pedal. Refer to
EC-65, "HOW TO SWITCH DIAGNOSTIC TEST MODE" . G If the battery is disconnected, the emission-related diagnostic information will be lost within 24
hours. G The following data are cleared when the ECM memory is erased. ­ Diagnostic trouble codes ­ 1st trip diagnostic trouble codes ­ Freeze frame data ­ 1st trip freeze frame data ­ System readiness test (SRT) codes ­ Test values Actual work procedures are explained using a DTC as an example. Be careful so that not only the DTC, but all of the data listed above, are cleared from the ECM memory during work procedures.

Malfunction Indicator Lamp (MIL)
DESCRIPTION
The MIL is located on the instrument panel.
1. The MIL will light up when the ignition switch is turned ON without the engine running. This is a bulb check. If the MIL does not light up, refer to DI-27, "WARNING LAMPS" , or see EC-601, "MIL & DATA LINK CONNECTORS" .
2. When the engine is started, the MIL should go off. If the MIL remains on, the on board diagnostic system has detected an engine system malfunction.

UBS00JS5

SEF217U

Revision: December 2006

EC-64

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

ON BOARD DIAGNOSTIC SYSTEM FUNCTION

The on board diagnostic system has the following 3 functions.

A

Diagnostic Test Mode
Mode I

KEY and ENG. Status
Ignition switch in ON position

Function BULB CHECK

Explanation of Function

This function checks the MIL bulb for damage (blown,

EC

open circuit, etc.).

If the MIL does not come on, check MIL circuit.

C

Engine stopped
D

Engine running

MALFUNCTION WARNING

Mode II

Ignition switch in SELF-DIAGNOSTIC

ON position

RESULTS

Engine stopped

This is a usual driving condition. When a malfunction is detected twice in two consecutive driving cycles (two trip

E

detection logic), the MIL will light up to inform the driver

that a malfunction has been detected.

The following malfunctions will light up or blink the MIL in

F

the 1st trip.

G Misfire (Possible three way catalyst damage)

G One trip detection diagnoses
G
This function allows DTCs and 1st trip DTCs to be read.

H

I

When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when there is J

malfunction on engine control system.

Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as

NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means K of operating fail-safe function.

The fail-safe function also operates when above diagnoses except MIL circuit are detected, and demands the

driver to repair the malfunction.
Engine operating condition in fail-safe mode

L
Engine speed will not rise more than 2,500 rpm due to the fuel cut

MIL Flashing Without DTC
M When any SRT codes are not set, MIL may flash without DTC. For the details, refer to EC-58, "How to Display SRT Status" .
HOW TO SWITCH DIAGNOSTIC TEST MODE NOTE: G It is better to count the time accurately with a clock. G It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit
has a malfunction. G Always ECM returns to Diagnostic Test Mode I after ignition switch is turned OFF.
How to Set Diagnostic Test Mode II (Self-diagnostic Results) 1. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds. 2. Repeat the following procedure quickly five times within 5 seconds. a. Fully depress the accelerator pedal. b. Fully release the accelerator pedal. 3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the MIL starts
blinking.

Revision: December 2006

EC-65

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

NOTE: Do not release the accelerator pedal for 10 seconds if MIL may start blinking on the halfway of this 10 seconds. This blinking is displaying SRT status and is continued for another 10 seconds. For the details, refer to EC-58 .
4. Fully release the accelerator pedal. ECM has entered to Diagnostic Test Mode II (Self-diagnostic results).
NOTE: Wait until the same DTC (or 1st trip DTC) appears to confirm all DTCs certainly.

PBIB0092E
How to Erase Diagnostic Test Mode II (Self-diagnostic Results) 1. Set ECM in Diagnostic Test Mode II (Self-diagnostic results). Refer to EC-65, "How to Set Diagnostic Test
Mode II (Self-diagnostic Results)" . 2. Fully depress the accelerator pedal and keep it for more than 10 seconds.
The emission-related diagnostic information has been erased from the backup memory in the ECM. 3. Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.

DIAGNOSTIC TEST MODE I -- BULB CHECK
In this mode, the MIL on the instrument panel should stay ON. If it remains OFF, check the bulb. Refer to DI27, "WARNING LAMPS" .

DIAGNOSTIC TEST MODE I -- MALFUNCTION WARNING

MIL

Condition

ON

When the malfunction is detected.

OFF

No malfunction

These DTC numbers are clarified in Diagnostic Test Mode II (SELF-DIAGNOSTIC RESULTS)

DIAGNOSTIC TEST MODE II -- SELF-DIAGNOSTIC RESULTS
In this mode, the DTC and 1st trip DTC are indicated by the number of blinks of the MIL as shown below. The DTC and 1st trip DTC are displayed at the same time. If the MIL does not illuminate in diagnostic test mode I (Malfunction warning), all displayed items are 1st trip DTCs. If only one code is displayed when the MIL illuminates in diagnostic test mode II (SELF-DIAGNOSTIC RESULTS), it is a DTC; if two or more codes are displayed, they may be either DTCs or 1st trip DTCs. DTC No. is same as that of 1st trip DTC. These unidentified codes can be identified by using the CONSULT-II or GST. A DTC will be used as an example for how to read a code.

Revision: December 2006

EC-66

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]
A

EC

C

D

E

F

G

H

I

PBIB3005E

J

A particular trouble code can be identified by the number of four-digit numeral flashes. The "zero" is indicated

by the number of ten flashes. The "A" is indicated by the number of eleven flash. The length of time the

1,000th-digit numeral flashes on and off is 1.2 seconds consisting of an ON (0.6-second) - OFF (0.6-second) cycle.

K

The 100th-digit numeral and lower digit numerals consist of a 0.3-second ON and 0.3-second OFF cycle.

A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later

numeral appears on the display 1.3 seconds after the former numeral has disappeared.

L

A change from one trouble code to another occurs at an interval of 1.8-second OFF.

In this way, all the detected malfunctions are classified by their DTC numbers. The DTC 0000 refers to no mal-

function. (See EC-14, "INDEX FOR DTC" )

M

How to Erase Diagnostic Test Mode II (Self-diagnostic Results)

The DTC can be erased from the back-up memory in the ECM by depressing accelerator pedal. Refer to EC66, "How to Erase Diagnostic Test Mode II (Self-diagnostic Results)" .

G If the battery is disconnected, the DTC will be lost from the backup memory within 24 hours. G Be careful not to erase the stored memory before starting trouble diagnoses.

OBD System Operation Chart
RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS

UBS00JS6

G When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are stored in the ECM memory.

G When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are stored in the ECM memory, and the MIL will come on. For details, refer to EC-51, "Two Trip Detection Logic" .

G The MIL will go off after the vehicle is driven 3 times with no malfunction. The drive is counted only when the recorded driving pattern is met (as stored in the ECM). If another malfunction occurs while counting, the counter will reset.

Revision: December 2006

EC-67

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

G The DTC and the freeze frame data will be stored until the vehicle is driven 40 times (driving pattern A) without the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and Fuel Injection System, the DTC and freeze frame data will be stored until the vehicle is driven 80 times (driving pattern C) without the same malfunction recurring. The "TIME" in "SELF-DIAGNOSTIC RESULTS" mode of CONSULT-II will count the number of times the vehicle is driven.
G The 1st trip DTC is not displayed when the self-diagnosis results in OK for the 2nd trip.

SUMMARY CHART

Items

Fuel Injection System

Misfire

Other

MIL (goes off)

3 (pattern B)

3 (pattern B)

3 (pattern B)

DTC, Freeze Frame Data (no display)

80 (pattern C)

80 (pattern C)

40 (pattern A)

1st Trip DTC (clear)

1 (pattern C), *1

1 (pattern C), *1

1 (pattern B)

1st Trip Freeze Frame Data (clear)

*1, *2

*1, *2

1 (pattern B)

For details about patterns B and C under "Fuel Injection System" and "Misfire", see EC-70 . For details about patterns A and B under "Other", see EC-72 . *1: Clear timing is at the moment OK is detected. *2: Clear timing is when the same malfunction is detected in the 2nd trip.

Revision: December 2006

EC-68

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

RELATIONSHIP BETWEEN MIL, DTC, 1ST TRIP DTC AND DRIVING PATTERNS FOR "MISFIRE

<EXHAUST QUALITY DETERIORATION>", "FUEL INJECTION SYSTEM"

A

EC

C

D

E

F

G

H

I

J

K

L

M

*1: When the same malfunction is detected in two consecutive trips, MIL will light up.

*2: MIL will go off after vehicle is driven 3 times (pattern B) without any malfunctions.

*4: The DTC and the freeze frame data *5: When a malfunction is detected for

will not be displayed any longer after

the first time, the 1st trip DTC and

vehicle is driven 80 times (pattern C)

the 1st trip freeze frame data will be

without the same malfunction. (The

stored in ECM.

DTC and the freeze frame data still

remain in ECM.)

*7: When the same malfunction is detected in the 2nd trip, the 1st trip freeze frame data will be cleared.

*8: 1st trip DTC will be cleared when vehicle is driven once (pattern C) without the same malfunction after DTC is stored in ECM.

SEF392S
*3: When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data will be stored in ECM.
*6: The 1st trip DTC and the 1st trip freeze frame data will be cleared at the moment OK is detected.

Revision: December 2006

EC-69

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

EXPLANATION FOR DRIVING PATTERNS FOR "MISFIRE <EXHAUST QUALITY DETERIORATION>", "FUEL INJECTION SYSTEM" <Driving Pattern B> Driving pattern B means the vehicle operation as follows: All components and systems should be monitored at least once by the OBD system. G The B counter will be cleared when the malfunction is detected once regardless of the driving pattern.
G The B counter will be counted up when driving pattern B is satisfied without any malfunction. G The MIL will go off when the B counter reaches 3. (*2 in "OBD SYSTEM OPERATION CHART")

<Driving Pattern C>
Driving pattern C means the vehicle operation as follows: The following conditions should be satisfied at the same time: Engine speed: (Engine speed in the freeze frame data) ±375 rpm Calculated load value: (Calculated load value in the freeze frame data) x (1±0.1) [%] Engine coolant temperature (T) condition:
G When the freeze frame data shows lower than 70°C (158°F), "T" should be lower than 70°C (158°F).
G When the freeze frame data shows higher than or equal to 70°C (158°F), "T" should be higher than or equal to 70°C (158°F).
Example: If the stored freeze frame data is as follows: Engine speed: 850 rpm, Calculated load value: 30%, Engine coolant temperature: 80°C (176°F) To be satisfied with driving pattern C, the vehicle should run under the following conditions: Engine speed: 475 - 1,225 rpm, Calculated load value: 27 - 33%, Engine coolant temperature: more than 70°C (158°F)
G The C counter will be cleared when the malfunction is detected regardless of vehicle conditions above.
G The C counter will be counted up when vehicle conditions above is satisfied without the same malfunction.
G The DTC will not be displayed after C counter reaches 80.
G The 1st trip DTC will be cleared when C counter is counted once without the same malfunction after DTC is stored in ECM.

Revision: December 2006

EC-70

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

RELATIONSHIP BETWEEN MIL, DTC, 1ST TRIP DTC AND DRIVING PATTERNS EXCEPT FOR

"MISFIRE <EXHAUST QUALITY DETERIORATION>", "FUEL INJECTION SYSTEM"

A

EC

C

D

E

F

G

H

I

J

K

L

M

*1: When the same malfunction is detected in two consecutive trips, MIL will light up.

*2: MIL will go off after vehicle is driven 3 times (pattern B) without any malfunctions.

*4: The DTC and the freeze frame data *5: When a malfunction is detected for

will not be displayed any longer after

the first time, the 1st trip DTC and

vehicle is driven 40 times (pattern A)

the 1st trip freeze frame data will be

without the same malfunction.

stored in ECM.

(The DTC and the freeze frame data

still remain in ECM.)

*7: When the same malfunction is detected in the 2nd trip, the 1st trip freeze frame data will be cleared.

SEF393SD
*3: When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data will be stored in ECM.
*6: 1st trip DTC will be cleared after vehicle is driven once (pattern B) without the same malfunction.

Revision: December 2006

EC-71

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QG18DE]

EXPLANATION FOR DRIVING PATTERNS EXCEPT FOR "MISFIRE <EXHAUST QUALITY DETERIORATION>", "FUEL INJECTION SYSTEM"
<Driving Pattern A>

AEC574
G The A counter will be cleared when the malfunction is detected regardless of (1) - (4). G The A counter will be counted up when (1) - (4) are satisfied without the same malfunction. G The DTC will not be displayed after the A counter reaches 40.
<Driving Pattern B> Driving pattern B means the vehicle operation as follows: All components and systems should be monitored at least once by the OBD system. G The B counter will be cleared when the malfunction is detected once regardless of the driving pattern. G The B counter will be counted up when driving pattern B is satisfied without any malfunctions. G The MIL will go off when the B counter reaches 3 (*2 in "OBD SYSTEM OPERATION CHART").

Revision: December 2006

EC-72

2006 Sentra

BASIC SERVICE PROCEDURE

[QG18DE]

BASIC SERVICE PROCEDURE
Basic Inspection
1. INSPECTION START

PFP:00018
A
UBS00JS7

EC 1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for
scheduled maintenance.

2. Open engine hood and check the following: C
­ Harness connectors for improper connections

­ Wiring harness for improper connections, pinches and cut

­ Vacuum hoses for splits, kinks and improper connections

D

­ Hoses and ducts for leaks

­ Air cleaner clogging

­ Gasket

E

3. Confirm that electrical or mechanical loads are not applied.

­ Headlamp switch is OFF. ­ Air conditioner switch is OFF.

SEF983U

F

­ Rear window defogger switch is OFF.

­ Steering wheel is in the straight-ahead position, etc.

G

4. Start engine and warm it up until engine coolant temperature

indicator points the middle of gauge.

Ensure engine stays below 1,000 rpm. H

I

5. Run engine at about 2,000 rpm for about 2 minutes under no load.
6. Make sure that no DTC is displayed with CONSULT-II or GST. OK or NG
OK >> GO TO 3. NG >> GO TO 2.
2. REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding Diagnostic Procedure.
>> GO TO 3.

J
SEF976U
K
L
M
SEF977U

Revision: December 2006

EC-73

2006 Sentra

BASIC SERVICE PROCEDURE
3. CHECK TARGET IDLE SPEED
With CONSULT-II 1. Run engine at about 2,000 rpm for about 2 minutes under no load. 2. Rev engine (2,000 to 3,000 rpm) two or three times under no
load, then run engine at idle speed for about 1 minute.

[QG18DE]

3. Read idle speed in "DATA MONITOR" mode with CONSULT-II. Refer to EC-119 .
M/T: 650 ± 50 rpm A/T: 800 ± 50 rpm (in P or N position)

PBIA8513J

SEF058Y
Without CONSULT-II 1. Run engine at about 2,000 rpm for about 2 minutes under no load. 2. Rev engine (2,000 to 3,000 rpm) two or three times under no load, then run engine at idle speed for about
1 minute. 3. Check idle speed. Refer to EC-78 .
M/T: 650 ± 50 rpm A/T: 800 ± 50 rpm (in P or N position) OK or NG OK >> GO TO 10. NG >> GO TO 4.
4. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Stop engine. 2. Perform EC-79, "Accelerator Pedal Released Position Learning" .
>> GO TO 5.
5. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform EC-80, "Throttle Valve Closed Position Learning" .
>> GO TO 6.

Revision: December 2006

EC-74

2006 Sentra

BASIC SERVICE PROCEDURE
6. PERFORM IDLE AIR VOLUME LEARNING
Refer to EC-80, "Idle Air Volume Learning" . Is Idle Air Volume Learning carried out successfully? Yes or No
Yes >> GO TO 7. No >> 1. Follow the instruction of Idle Air Volume Learning.
2. GO TO 4.
7. CHECK TARGET IDLE SPEED AGAIN
With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Read idle speed in "DATA MONITOR" mode with CONSULT-II. Refer to EC-78 .
M/T: 650 ± 50 rpm A/T: 800 ± 50 rpm (in P or N position)
Without CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Check idle speed. Refer to EC-78 .
M/T: 650 ± 50 rpm A/T: 800 ± 50 rpm (in P or N position) OK or NG OK >> GO TO 10. NG >> GO TO 8.
8. DETECT MALFUNCTIONING PART

[QG18DE]
A EC
C D E F G H I

Check the following.

J

G Check camshaft position sensor (PHASE) and circuit. Refer to EC-328 .

G Check crankshaft position sensor (POS) and circuit. Refer to EC-321 .

OK or NG

K

OK >> GO TO 9.

NG >> 1. Repair or replace.

2. GO TO 4.

L

9. CHECK ECM FUNCTION
M 1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but
this is a rare case.)
2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to BL-96, "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM -- NATS)" .

>> GO TO 4.

Revision: December 2006

EC-75

2006 Sentra

BASIC SERVICE PROCEDURE
10. CHECK IGNITION TIMING
1. Run engine at idle. 2. Check ignition timing with a timing light. Refer to EC-78 .
M/T: 7 ± 5° BTDC A/T: 18 ± 5° BTDC (in P or N position) OK or NG OK >> GO TO 19. NG >> GO TO 11.

11. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Stop engine. 2. Perform EC-79, "Accelerator Pedal Released Position Learning" .
>> GO TO 12.
12. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
PerformEC-80, "Throttle Valve Closed Position Learning" .
>> GO TO 13.
13. PERFORM IDLE AIR VOLUME LEARNING
Refer to EC-80, "Idle Air Volume Learning" . Is Idle Air Volume Learning carried out successfully? Yes or No
Yes >> GO TO 14. No >> 1. Follow the instruction of Idle Air Volume Learning.
2. GO TO 4.
14. CHECK TARGET IDLE SPEED AGAIN
With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Read idle speed in "DATA MONITOR" mode with CONSULT-II. Refer toEC-78 .
M/T: 650 ± 50 rpm A/T: 800 ± 50 rpm (in P or N position)
Without CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Check idle speed. Refer to EC-78 .
M/T: 650 ± 50 rpm A/T: 800 ± 50 rpm (in P or N position) OK or NG OK >> GO TO 15. NG >> GO TO 17.

Revision: December 2006

EC-76

[QG18DE]
BBIA0211E
2006 Sentra

BASIC SERVICE PROCEDURE
15. CHECK IGNITION TIMING AGAIN
1. Run engine at idle. 2. Check ignition timing with a timing light. Refer to EC-78 .
M/T: 7 ± 5° BTDC A/T: 18 ± 5° BTDC (in P or N position) OK or NG OK >> GO TO 19 NG >> GO TO 16.

[QG18DE]
A EC
C D

16. CHECK TIMING CHAIN INSTALLATION

BBIA0211E
E

Check timing chain installation. Refer to EM-42, "TIMING CHAIN" .

F

OK or NG

OK >> GO TO 17.

NG >> 1. Repair the timing chain installation.

G

2. GO TO 4.

17. DETECT MALFUNCTIONING PART H

Check the following.

G Check camshaft position sensor (PHASE) and circuit. Refer to EC-328 .

G Check crankshaft position sensor (POS) and circuit. Refer to EC-321 .

I

OK or NG

OK >> GO TO 18.

NG >> 1. Repair or replace.

J

2. GO TO 4.

18. CHECK ECM FUNCTION

K

1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but

this is a rare case.)

L

2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to

BL-96, "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM -- NATS)" .

M >> GO TO 4.

19. INSPECTION END

Did you replace ECM, referring this Basic Inspection procedure? Yes or No
Yes >> 1. Perform EC-79, "VIN Registration" . 2. INSPECTION END
No >> INSPECTION END

Revision: December 2006

EC-77

2006 Sentra

BASIC SERVICE PROCEDURE
Idle Speed and Ignition Timing Check
IDLE SPEED With CONSULT-II
Check idle speed in "DATA MONITOR" mode with CONSULT-II.

[QG18DE]
UBS00JS8

With GST Check idle speed in "Service $01" with GST.
IGNITION TIMING Any of following two methods may be used.
Method A 1. Slide the harness protector of ignition coil No.1 to clear the
wires. 2. Attach timing light to the ignition coil No.1 wires as shown in the
figure. 3. Check ignition timing.

SEF058Y BBIA0134E

Method B 1. Remove ignition coil No.1.

Revision: December 2006

EC-78

BBIA0211E
BBIA0135E
2006 Sentra

BASIC SERVICE PROCEDURE

[QG18DE]

2. Connect ignition coil No.1 and spark plug No.1 with suitable high-tension wire as shown, and attach timing

light clamp to this wire.

A

EC

C

3. Check ignition timing.

D
SEF166Y
E

F

G

VIN Registration
DESCRIPTION

BBIA0211E

H

UBS00JSA

VIN Registration is an operation to registering VIN in ECM. It must be performed each time ECM is replaced. I

NOTE: Accurate VIN which is registered in ECM may be required for Inspection & Maintenance (I/M).

OPERATION PROCEDURE

J

With CONSULT-II

1. Check the VIN of the vehicle and note it. Refer to GI-46, "IDENTIFICATION INFORMATION" . K
2. Turn ignition switch ON and engine stopped.

3. Select "VIN REGISTRATION" in "WORK SUPPORT" mode.

4. Follow the instruction of CONSULT-II display.

L

M

PBIB2242E

Accelerator Pedal Released Position Learning
DESCRIPTION

UBS00JSB

Accelerator Pedal Released Position Learning is an operation to learn the fully released position of the accelerator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each time harness connector of accelerator pedal position sensor or ECM is disconnected.

OPERATION PROCEDURE 1. Make sure that accelerator pedal is fully released. 2. Turn ignition switch ON and wait at least 2 seconds. 3. Turn ignition switch OFF and wait at least 10 seconds. 4. Turn ignition switch ON and wait at least 2 seconds.

Revision: December 2006

EC-79

2006 Sentra

BASIC SERVICE PROCEDURE

[QG18DE]

5. Turn ignition switch OFF and wait at least 10 seconds.

Throttle Valve Closed Position Learning
DESCRIPTION

UBS00JSC

Throttle Valve Closed Position Learning is an operation to learn the fully closed position of the throttle valve by monitoring the throttle position sensor output signal. It must be performed each time harness connector of electric throttle control actuator or ECM is disconnected.

OPERATION PROCEDURE 1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds. Make sure that throttle valve moves during above 10 seconds by confirming the operating sound.

Idle Air Volume Learning
DESCRIPTION

UBS00JSD

Idle Air Volume Learning is an operation to learn the idle air volume that keeps each engine within the specific range. It must be performed under any of the following conditions:

G Each time electric throttle control actuator or ECM is replaced.

G Idle speed or ignition timing is out of specification.

PREPARATION Before performing Idle Air Volume Learning, make sure that all of the following conditions are satisfied. Learning will be cancelled if any of the following conditions are missed for even a moment.
G Battery voltage: More than 12.9V (At idle) G Engine coolant temperature: 70 - 95°C (158 - 203°F) G PNP switch: ON G Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger) On vehicles equipped with daytime light systems, if the parking brake is applied before the engine is started the headlamp will not be illuminated. G Steering wheel: Neutral (Straight-ahead position)
G Vehicle speed: Stopped G Transmission: Warmed-up ­ A/T models
· With CONSULT-II: Drive vehicle until "FLUID TEMP SE" in "DATA MONITOR" mode of "A/T" system indicates less than 0.9V.
· Without CONSULT-II: Drive vehicle for 10 minutes.
­ M/T models · Drive vehicle for 10 minutes.

OPERATION PROCEDURE With CONSULT-II
1. Perform EC-79, "Accelerator Pedal Released Position Learning" . 2. Perform EC-80, "Throttle Valve Closed Position Learning" . 3. Start engine and warm it up to normal operating temperature. 4. Check that all items listed under the topic PREPARATION (previously mentioned) are in good order.

Revision: December 2006

EC-80

2006 Sentra

BASIC SERVICE PROCEDURE
5. Select "IDLE AIR VOL LEARN" in "WORK SUPPORT" mode.

[QG18DE]
A

EC

6. Touch "START" and wait 20 seconds.

C
SEF452Y
D
E

F

G

SEF454Y

7. Make sure that "CMPLT" is displayed on CONSULT-II screen. If

H

"CMPLT" is not displayed, Idle Air Volume Learning will not be

carried out successfully. In this case, find the cause of the inci-

dent by referring to the Diagnostic Procedure below.

I

8. Rev up the engine two or three times and make sure that idle

speed and ignition timing are within the specifications. Refer to

EC-78 .

J

ITEM

SPECIFICATION

Idle speed Ignition timing

M/T: 650 ± 50 rpm A/T: 800 ± 50 rpm (in P or N position)
M/T: 7 ± 5° BTDC A/T: 18 ± 5° BTDC (in P or N position)

Without CONSULT-II

K
MBIB0238E
L

NOTE:

G It is better to count the time accurately with a clock.

M

G It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit has a malfunction.

1. Perform EC-79, "Accelerator Pedal Released Position Learning" .

2. Perform EC-80, "Throttle Valve Closed Position Learning" .

3. Start engine and warm it up to normal operating temperature.

4. Check that all items listed under the topic PREPARATION (previously mentioned) are in good order.

5. Turn ignition switch OFF and wait at least 10 seconds.

6. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.

7. Repeat the following procedure quickly five times within 5 seconds.

a. Fully depress the accelerator pedal.

b. Fully release the accelerator pedal.

8. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL stops blinking and turned ON.

9. Fully release the accelerator pedal within 3 seconds after the MIL turned ON.

Revision: December 2006

EC-81

2006 Sentra

BASIC SERVICE PROCEDURE
10. Start engine and let it idle. 11. Wait 20 seconds.

[QG18DE]

SEC897C
12. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications. Refer to EC-78 .

ITEM

SPECIFICATION

Idle speed

M/T: 650 ± 50 rpm A/T: 800 ± 50 rpm (in P or N position)

Ignition timing

M/T: 7 ± 5° BTDC A/T: 18 ± 5° BTDC (in P or N position)

13. If idle speed and ignition timing are not within the specification, Idle Air Volume Learning will not be carried out successfully. In this case, find the cause of the incident by referring to the Diagnostic Procedure below.

DIAGNOSTIC PROCEDURE If idle air volume learning cannot be performed successfully, proceed as follows: 1. Check that throttle valve is fully closed. 2. Check PCV valve operation. 3. Check that downstream of throttle valve is free from air leakage. 4. When the above three items check out OK, engine component parts and their installation condi-
tion are questionable. Check and eliminate the cause of the incident. It is useful to perform EC-134, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" . 5. If any of the following conditions occur after the engine has started, eliminate the cause of the incident and perform Idle air volume learning all over again: ­ Engine stalls. ­ Erroneous idle.

Fuel Pressure Check
FUEL PRESSURE RELEASE With CONSULT-II
1. Turn ignition switch ON.
2. Perform "FUEL PRESSURE RELEASE" in "WORK SUPPORT" mode with CONSULT-II.
3. Start engine.
4. After engine stalls, crank it two or three times to release all fuel pressure.
5. Turn ignition switch OFF.

UBS00JSE

SEF214Y

Revision: December 2006

EC-82

2006 Sentra

BASIC SERVICE PROCEDURE
Without CONSULT-II 1. Remove fuse for fuel pump. 2. Start engine. 3. After engine stalls, crank it two or three times to release all fuel
pressure. 4. Turn ignition switch OFF and reconnect fuel pump fuse. 5. Reinstall fuel pump fuse after servicing fuel system.

[QG18DE]
A EC
C

D
LEC298

FUEL PRESSURE CHECK

Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.

E

NOTE:

Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel pres-

sure cannot be completely released because B15 models do not have fuel return system. F

Method A

CAUTION:

G Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.

G

G Be careful not to scratch or get the fuel hose connection area dirty when servicing, so that the

quick connector o-ring maintains sealability.

G When reconnecting fuel line, always use new clamps.

H

G Make sure that clamp screws do not contact adjacent parts.

G Use a torque driver to tighten clamps.

G Use Fuel Pressure Gauge Kit J-44321 to check fuel pres-

I

sure.

1. Release fuel pressure to zero.

2. Disconnect fuel hose from fuel feed tube (engine side) using fuel

J

tube quick connect removal tool.

K
BBIA0141E

3. Release quick connector and disconnect fuel hose from fuel

L

feed tube (underbody side). Remove fuel hose assembly.

CAUTION:

Do not install hose clamps over flared portions of fuel feed

M

tubes or damage to fuel feed tubes may result.

4. Install fuel pressure gauge from kit J-44321 between fuel tubes using hose and clamps from kit.

5. Turn ignition switch ON and check for fuel leakage.

6. Start engine and read the indication on fuel pressure gauge.

At idle speed: Approximately 350 kPa (3.57 kg/cm2 , 51 psi)

BBIA0137E

If results are unsatisfactory, check for fuel leakage in fuel line between fuel tank and injector. If OK, replace fuel level sensor unit and fuel pump assembly. Refer to FL-3, "Removal and Installation" .

Method B
CAUTION: G Be careful not to scratch or get the fuel hose connection area dirty when servicing, so that the
quick connector o-ring maintains sealability.
G Use Fuel Pressure Gauge Kit J-44321 and Fuel Pressure Adapter J-44321-6 to check fuel pressure.

Revision: December 2006

EC-83

2006 Sentra

BASIC SERVICE PROCEDURE

[QG18DE]

1. Release fuel pressure to zero. Refer to EC-82, "FUEL PRESSURE RELEASE" . 2. Remove fuel hose using Quick Connector Release J-45488. Refer to EM-21, "FUEL INJECTOR AND
FUEL TUBE" . G Do not twist or kink fuel hose because it is plastic hose. G Do not remove fuel hose from quick connector. G Keep fuel hose connections clean. 3. Install Fuel Pressure Adapter J-44321-6 and Fuel Pressure Gauge (from kit J-44321). G Do not distort or bend fuel rail tube when installing fuel pressure gauge adapter. G When reconnecting fuel hose, check the original fuel hose for damage and abnormality.

4. Turn ignition switch ON (reactivate fuel pump), and check for fuel leakage. 5. Start engine and check for fuel leakage. 6. Read the indication of fuel pressure gauge.
G During fuel pressure check, check for fuel leakage from fuel connection every 3 minutes.

At idling: Approximately 350 kPa (3.57 kg/cm2 , 51 psi)
7. If result is unsatisfactory, go to next step. 8. Check the following.
G Fuel hoses and fuel tubes for clogging G Fuel filter for clogging G Fuel pump G Fuel pressure regulator for clogging If OK, replace fuel pressure regulator. If NG, repair or replace. 9. Before disconnecting Fuel Pressure Gauge and Fuel Pressure Adapter J-44321-6, release fuel pressure to zero. Refer to EC-82, "FUEL PRESSURE RELEASE" .

Revision: December 2006

EC-84

2006 Sentra

TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS Trouble Diagnosis Introduction
INTRODUCTION The engine has an ECM to control major systems such as fuel control, ignition control, idle air control system, etc. The ECM accepts input signals from sensors and instantly drives actuators. It is essential that both input and output signals are proper and stable. At the same time, it is important that there are no malfunctions such as vacuum leaks, fouled spark plugs, or other malfunctions with the engine.
It is much more difficult to diagnose an incident that occurs intermittently rather than continuously. Most intermittent incidents are caused by poor electric connections or improper wiring. In this case, careful checking of suspected circuits may help prevent the replacement of good parts.
A visual check only may not find the cause of the incidents. A road test with CONSULT-II (or GST) or a circuit tester connected should be performed. Follow the Work Flow on EC-86 . Before undertaking actual checks, take a few minutes to talk with a customer who approaches with a driveability complaint. The customer can supply good information about such incidents, especially intermittent ones. Find out what symptoms are present and under what conditions they occur. A Diagnostic Worksheet like the example on EC-89 should be used. Start your diagnosis by looking for conventional malfunctions first. This will help troubleshoot driveability malfunctions on an electronically controlled engine vehicle.

[QG18DE]
PFP:00004
A
UBS00JSF
EC

C

D

MEF036D

E

F

G
H
SEF233G
I

J

K

L
SEF234G
M

Revision: December 2006

EC-85

2006 Sentra

WORK FLOW Overall Sequence

TROUBLE DIAGNOSIS

[QG18DE]

Revision: December 2006

EC-86

PBIB2267E
2006 Sentra

TROUBLE DIAGNOSIS
Detailed Flow
1. GET INFORMATION FOR SYMPTOM

[QG18DE]
A

Get the detailed information from the customer about the symptom (the condition and the environment when

the incident/malfunction occurred) using the EC-89, "DIAGNOSTIC WORKSHEET" .

EC

>> GO TO 2. C
2. CHECK DTC*1

1. Check DTC*1 .

D

2. Perform the following procedure if DTC*1 is displayed.

­ Record DTC*1 and freeze frame data*2 . (Print them out with CONSULT-II or GST.) E
­ Erase DTC*1 . (Refer to EC-63, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" .)

­ Study the relationship between the cause detected by DTC*1 and the symptom described by the cus- F tomer. (Symptom Matrix Chart is useful. Refer to EC-94 .)

3. Check related service bulletins for information.

Is any symptom described and any DTC detected?

G

Symptom is described, DTC*1 is displayed>>GO TO 3.

Symptom is described, DTC*1 is not displayed>>GO TO 4.

Symptom is not described, DTC*1 is displayed>>GO TO 5.

H

3. CONFIRM THE SYMPTOM

I

Try to confirm the symptom described by the customer (except MIL ON).

DIAGNOSIS WORK SHEET is useful to verify the incident.

Connect CONSULT-II to the vehicle in DATA MONITOR (AUTO TRIG) mode and check real time diagnosis results.

J

Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 5.

K

4. CONFIRM THE SYMPTOM

L

Try to confirm the symptom described by the customer.

DIAGNOSIS WORK SHEET is useful to verify the incident.

Connect CONSULT-II to the vehicle in DATA MONITOR (AUTO TRIG) mode and check real time diagnosis results.

M

Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 6.

Revision: December 2006

EC-87

2006 Sentra

TROUBLE DIAGNOSIS
5. PERFORM DTC CONFIRMATION PROCEDURE

[QG18DE]

Perform DTC Confirmation Procedure for the displayed DTC*1 , and then make sure that DTC*1 is detected again. At this time, always connect CONSULT-II to the vehicle, and check diagnostic results in real time on "DATA MONITOR (AUTO TRIG)". If two or more DTCs*1 are detected, refer to EC-91, "DTC Inspection Priority Chart" and determine trouble diagnosis order.
NOTE: G Freeze frame data*2 is useful if the DTC*1 is not detected.
G Perform Overall Function Check if DTC Confirmation Procedure is not included on Service Manual. This simplified check procedure is an effective alternative though DTC*1 cannot be detected during this check. If the result of Overall Function Check is NG, it is the same as the detection of DTC*1 by DTC Confirmation Procedure.
Is DTC*1 detected?
Yes >> GO TO 10. No >> Check according to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
6. PERFORM BASIC INSPECTION

Perform EC-73, "Basic Inspection" .

With CONSULT-II>>GO TO 7. Without CONSULT-II>>GO TO 9.
7. PERFORM DATA MONITOR (SPEC) MODE
With CONSULT-II Make sure that "MAS A/F SE-B1", "B/FUEL SCHDL", and "A/F ALPHA-B1" are within the SP value using CONSULT-II "DATA MONITOR (SPEC)" mode. Refer to EC-135, "Diagnostic Procedure" . Are they within the SP value?
Yes >> GO TO 9. No >> GO TO 8.

8. DETECT MALFUNCTIONING PART BY TROUBLE DIAGNOSIS - SPECIFICATION VALUE

SEF601Z

Detect malfunctioning part according toEC-134, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" . Is malfunctioning part detected?
Yes >> GO TO 11. No >> GO TO 9.
9. DETECT MALFUNCTIONING SYSTEM BY SYMPTOM MATRIX CHART

Detect malfunctioning system according toEC-94, "Symptom Matrix Chart" based on the confirmed symptom in step 4, and determine the trouble diagnosis order based on possible causes and symptom.

>> GO TO 10.

Revision: December 2006

EC-88

2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]

10. DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE A

Inspect according to Diagnostic Procedure of the system.

NOTE: The Diagnostic Procedure in EC section described based on open circuit inspection. A short circuit inspection EC is also required for the circuit check in the Diagnostic Procedure. For details, refer to Circuit Inspection in GI26, "How to Perform Efficient Diagnosis for an Electrical Incident" .

Is malfunctioning part detected?

C

Yes >> GO TO 11.

No >> Monitor input data from related sensors or check voltage of related ECM terminals using CON-

SULT-II. Refer to EC-129, "CONSULT-II Reference Value in Data Monitor" , EC-107, "ECM Termi- D nals and Reference Value" .

11. REPAIR OR REPLACE THE MALFUNCTIONING PART E 1. Repair or replace the malfunctioning part.

2. Reconnect parts or connectors disconnected during Diagnostic Procedure again after repair and replace-

ment.

F

3. Check DTC. If DTC is displayed, erase it, refer to EC-63, "HOW TO ERASE EMISSION-RELATED DIAG-

NOSTIC INFORMATION" .

G >> GO TO 12.

12. FINAL CHECK

H

When DTC was detected in step 2, perform DTC Confirmation Procedure or Overall Function Check again,
and then make sure that the malfunction have been repaired securely. When symptom was described from the customer, refer to confirmed symptom in step 3 or 4, and make sure I
that the symptom is not detected.

OK or NG

NG (DTC*1 is detected)>>GO TO 10.

J

NG (Symptom remains)>>GO TO 6. OK >> 1. Before returning the vehicle to the customer, make sure to erase unnecessary DTC*1 in ECM

and TCM (Transmission Control Module). (Refer to EC-63, "HOW TO ERASE EMISSION- K

RELATED DIAGNOSTIC INFORMATION" and EC-63, "How to Erase DTC" .)

2. If the completion of SRT is needed, drive vehicle under the specific driving pattern. Refer to EC-

60, "Driving Pattern" .

L

3. INSPECTION END

*1: Include 1st trip DTC.

*2: Include 1st trip freeze frame data.

M

DIAGNOSTIC WORKSHEET Description

There are many operating conditions that lead to the malfunction of engine components. A good grasp of such conditions can make troubleshooting faster and more accurate. In general, each customer feels differently about an incident. It is important to fully understand the symptoms or conditions for a customer complaint. Utilize a diagnostic worksheet like the one on the next page in order to organize all the information for troubleshooting. Some conditions may cause the MIL to come on steady or blink and DTC to be detected. Examples:

G Vehicle ran out of fuel, which caused the engine to misfire.
G Fuel filler cap was left off or incorrectly screwed on, allowing fuel to evaporate into the atmosphere.

SEF907L

Revision: December 2006

EC-89

2006 Sentra

Worksheet Sample

TROUBLE DIAGNOSIS

[QG18DE]

MTBL0017

Revision: December 2006

EC-90

2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]

DTC Inspection Priority Chart

UBS00JSG

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority A

chart.

NOTE: G If DTC U1000 and/or U1001 is displayed with other DTC, first perform the trouble diagnosis for EC
DTC U1000 and U1001. Refer to EC-152, "DTC U1000, U1001 CAN COMMUNICATION LINE" .

G If DTC U1010 is displayed with other DTC, first perform the trouble diagnosis for DTC U1010. Refer

to EC-155, "DTC U1010 CAN COMMUNICATION".

C

Priority

Detected items (DTC)

1

G U1000 U1001 CAN communication line

D

G U1010 CAN communication

G P0101 P0102 P0103 Mass air flow sensor

G P0112 P0113 P0127 Intake air temperature sensor

E

G P0117 P0118 P0125 Engine coolant temperature sensor

G P0122 P0123 P0222 P0223 P1225 P1226 P2135 Throttle position sensor

G P0128 Thermostat function

F

G P0181 P0182 P0183 Fuel tank temperature sensor

G P0327 P0328 Knock sensor

G P0335 Crankshaft position sensor (POS)

G

G P0340 Camshaft position sensor (PHASE)

G P0460 P0461 P0462 P0463 Fuel level sensor

G P0500 Vehicle speed sensor

H

G P0605 ECM

G P0643 Sensor power supply

G P0850 Park/Neutral position (PNP) switch

I

G P1610-P1615 NATS

G P1705 Park/Neutral position (PNP) switch

G P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor

J

K

L

M

Revision: December 2006

EC-91

2006 Sentra

Priority 2
3

TROUBLE DIAGNOSIS

[QG18DE]

Detected items (DTC)
G P0031 P0032 A/F sensor 1 heater G P0037 P0038 Heated oxygen sensor 2 heater G P0130 P0131 P0132 P0133 P2A00 A/F sensor 1 G P0137 P0138 P0139 Heated oxygen sensor 2 G P0441 EVAP control system purge flow monitoring G P0443 P0444 P0445 EVAP canister purge volume control solenoid valve G P0447 P0448 EVAP canister vent control valve G P0451 P0452 P0453 EVAP control system pressure sensor G P0550 power steering pressure sensor G P0603 ECM power supply G P0705-P0725, P0740-P0755, P1705, P1706, P1760 A/T related sensors and solenoid valves and switches G P1217 Engine over temperature (OVERHEAT) G P1805 Brake switch G P2100 P2103 P2118 Electric throttle control actuator G P2101 Electric throttle control function
G P0011 Intake valve timing control G P0075 Intake valve timing control solenoid valve G P0171 P0172 Fuel injection system function G P0300 - P0304 Misfire G P0420 Three way catalyst function G P0442 P0456 EVAP control system (SMALL LEAK, VERY SMALL LEAK) G P0455 EVAP control system (GROSS LEAK) G P0731-P0734 A/T function G P1148 Closed loop control G P1564 ASCD steering switch G P1572 ASCD brake switch G P1574 ASCD vehicle speed sensor G P2119 Electric throttle control actuator

Revision: December 2006

EC-92

2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]

Fail-safe Chart
When the DTC listed below is detected, the ECM enters fail-safe mode and the MIL lights up.

UBS00JSH
A

DTC No. Detected items

Engine operating condition in fail-safe mode

P0102

Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.

EC

P0103

P0117 P0118

Engine coolant tempera- Engine coolant temperature will be determined by ECM based on the time after turning

ture sensor circuit

ignition switch ON or START.

C

CONSULT-II displays the engine coolant temperature decided by ECM.

Condition
Just as ignition switch is turned ON or START

Engine coolant temperature decided (CONSULTII display)
D
40°C (104°F)

More than approx. 4 minutes after ignition ON or START

80°C (176°F)

E

Except as shown above

40 - 80°C (104 - 176°F) (Depends on the time)

F
When the fail-safe system for engine coolant temperature sensor is activated, the cool-

ing fan operates while engine is running.

P0122 P0123 P0222 P0223 P2135
P0643

Throttle position sensor Sensor power supply

The ECM controls the electric throttle control actuator in regulating the throttle opening

in order for the idle position to be within +10 degrees.

G

The ECM regulates the opening speed of the throttle valve to be slower than the nor-

mal condition.

So, the acceleration will be poor.

H

ECM stops the electric throttle control actuator control, throttle valve is maintained at a

fixed opening (approx. 5 degrees) by the return spring.

P2100 P2103

Throttle control relay

ECM stops the electric throttle control actuator control, throttle valve is maintained at a

I

fixed opening (approx. 5 degrees) by the return spring.

P2101

Electric throttle control func- ECM stops the electric throttle control actuator control, throttle valve is maintained at a

tion

fixed opening (approx. 5 degrees) by the return spring.

J

P2118

Throttle control motor

ECM stops the electric throttle control actuator control, throttle valve is maintained at a

fixed opening (approx. 5 degrees) by the return spring.

P2119

Electric throttle control actu- (When electric throttle control actuator does not function properly due to the return

ator

spring malfunction:)

K

ECM controls the electric throttle actuator by regulating the throttle opening around the idle position. The engine speed will not rise more than 2,000 rpm.

(When throttle valve opening angle in fail-safe mode is not in specified range:)

L

ECM controls the electric throttle control actuator by regulating the throttle opening to

20 degrees or less.

(When ECM detects the throttle valve is stuck open:)

M

While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops,

the engine stalls.

The engine can restart in N or P position (A/T), Neutral position (M/T) and engine

speed will not exceed 1,000 rpm or more.

P2122 P2123 P2127 P2128 P2138

Accelerator pedal position sensor

The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. So, the acceleration will be poor.

G When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when there is malfunction on engine control system. Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means of operating fail-safe function. The fail-safe function also operates when above diagnoses except MIL circuit are detected, and demands the driver to repair the malfunction.

Engine operating condition in fail-safe mode

Engine speed will not rise more than 2,500 rpm due to the fuel cut

Revision: December 2006

EC-93

2006 Sentra

TROUBLE DIAGNOSIS

Symptom Matrix Chart
SYSTEM -- BASIC ENGINE CONTROL SYSTEM

SYMPTOM

[QG18DE]
UBS00JSI

HARD/NO START/RESTART (EXCP. HA) ENGINE STALL HESITATION/SURGING/FLAT SPOT SPARK KNOCK/DETONATION LACK OF POWER/POOR ACCELERATION HIGH IDLE/LOW IDLE ROUGH IDLE/HUNTING IDLING VIBRATION SLOW/NO RETURN TO IDLE OVERHEATS/WATER TEMPERATURE HIGH EXCESSIVE FUEL CONSUMPTION EXCESSIVE OIL CONSUMPTION BATTERY DEAD (UNDER CHARGE)

Reference page

Warranty symptom code

Fuel Fuel pump circuit

Fuel pressure regulator system

Fuel injector circuit

Evaporative emission system

Air

Positive crankcase ventilation sys-

tem

Incorrect idle speed adjustment

Electric throttle control actuator

Ignition Incorrect ignition timing adjustment Ignition circuit
Main power supply and ground circuit Mass air flow sensor circuit
Engine coolant temperature sensor circuit

Throttle position sensor circuit

Accelerator pedal position sensor circuit

A/F sensor 1 circuit
Knock sensor circuit Crankshaft position sensor (POS) circuit Camshaft position sensor (PHASE) circuit

AA AB AC AD AE AF AG AH AJ AK AL AM HA

11232

22

3

2 EC-579

334444444

4

EC-82

11232

22

2

EC-573

334444444

4

EC-35

334444444

41

EC-48

33

1111

1

112332222

2

33111 11222 22333
11222

11 22 33
22

1 2 23
2

11222322312

12

22222

2

3212

2

1232

22

2

22

3

22

22

EC-73

EC-494,

2

EC-500 , EC-507 ,

EC-512

EC-78

EC-584

2 EC-145

EC-177, EC-186

EC-199, EC-212

EC-205, EC-302 , EC-464 , EC-466 , EC-528

EC-440, EC-514 , EC-521 , EC-535

EC-220, EC-227 , EC-234 , EC-241 , EC-543

EC-316

EC-321

EC-328

Revision: December 2006

EC-94

2006 Sentra

TROUBLE DIAGNOSIS
SYMPTOM

[QG18DE]
A

HARD/NO START/RESTART (EXCP. HA) ENGINE STALL HESITATION/SURGING/FLAT SPOT SPARK KNOCK/DETONATION LACK OF POWER/POOR ACCELERATION HIGH IDLE/LOW IDLE ROUGH IDLE/HUNTING IDLING VIBRATION SLOW/NO RETURN TO IDLE OVERHEATS/WATER TEMPERATURE HIGH EXCESSIVE FUEL CONSUMPTION EXCESSIVE OIL CONSUMPTION BATTERY DEAD (UNDER CHARGE)

EC

Reference

C

page

D

E

Warranty symptom code Vehicle speed signal circuit

AA AB AC AD AE AF AG AH AJ AK AL AM HA

23

3

3

EC-422

F

Power steering pressure sensor circuit

3333

EC-428

ECM

22333333333

EC-433,

G

EC-437

Intake valve timing control solenoid valve circuit

33

3

3

3

PNP switch circuit

3

33333

3

EC-157
H
EC-445

Refrigerant pressure sensor circuit

2

3333

4

EC-596

Electrical load signal circuit Air conditioner circuit

3333

EC-563

I

223333333

3

2 MTC-33

1 - 6: The numbers refer to the order of inspection.

(continued on next page)

J

SYSTEM -- ENGINE MECHANICAL & OTHER

SYMPTOM

K

L

M
Reference page

HARD/NO START/RESTART (EXCP. HA) ENGINE STALL HESITATION/SURGING/FLAT SPOT SPARK KNOCK/DETONATION LACK OF POWER/POOR ACCELERATION HIGH IDLE/LOW IDLE ROUGH IDLE/HUNTING IDLING VIBRATION SLOW/NO RETURN TO IDLE OVERHEATS/WATER TEMPERATURE HIGH EXCESSIVE FUEL CONSUMPTION EXCESSIVE OIL CONSUMPTION BATTERY DEAD (UNDER CHARGE)

Warranty symptom code

Fuel

Fuel tank

Fuel piping

Vapor lock

Valve deposit

Poor fuel (Heavy weight gasoline, Low octane)

Revision: December 2006

AA AB AC AD AE AF AG AH AJ AK AL AM HA

5

555

55

FL-7

5

EM-21

5

--

--

5

555

55

5

--

EC-95

2006 Sentra

TROUBLE DIAGNOSIS
SYMPTOM

[QG18DE]

HARD/NO START/RESTART (EXCP. HA) ENGINE STALL HESITATION/SURGING/FLAT SPOT SPARK KNOCK/DETONATION LACK OF POWER/POOR ACCELERATION HIGH IDLE/LOW IDLE ROUGH IDLE/HUNTING IDLING VIBRATION SLOW/NO RETURN TO IDLE OVERHEATS/WATER TEMPERATURE HIGH EXCESSIVE FUEL CONSUMPTION EXCESSIVE OIL CONSUMPTION BATTERY DEAD (UNDER CHARGE)

Reference page

Warranty symptom code

AA AB AC AD AE AF AG AH AJ AK AL AM HA

Air

Air duct

--

Air cleaner

--

Air leakage from air duct

(Mass air flow sensor --electric throttle control actuator)

55

5

55

5

Electric throttle control actuator

5

5

5

5

-- EM-15

Air leakage from intake manifold/ Collector/Gasket

EM-15

Cranking Battery Generator circuit

111

1

11

SC-4 1
SC-19

Starter circuit

3

Signal plate/Flywheel/Drive plate 6

1

SC-7

EM-92

PNP switch

4

MT-12 or AT-114

Engine

Cylinder head Cylinder head gasket

55555

55

5

4

3

EM-55

Cylinder block

Piston

4

Piston ring Connecting rod

66666

66

6

EM-69

Bearing

Crankshaft

Valve mechanism

Timing chain Camshaft Intake valve timing control

55555

55

EM-42

EM-28

5

EC-172

Intake valve Exhaust valve

3

EM-55

Exhaust

Exhaust manifold/Tube/Muffler/ Gasket
Three way catalyst

55555

55

5

EX-3, EM15

Lubrication

Oil pan/Oil strainer/Oil pump/Oil filter/Oil gallery

5

5

5

5

5

55

52

EM-18, LU8 , LU-7 , LU-4

Oil level (Low)/Filthy oil

MA-20

Revision: December 2006

EC-96

2006 Sentra

TROUBLE DIAGNOSIS
SYMPTOM

[QG18DE]
A

HARD/NO START/RESTART (EXCP. HA) ENGINE STALL HESITATION/SURGING/FLAT SPOT SPARK KNOCK/DETONATION LACK OF POWER/POOR ACCELERATION HIGH IDLE/LOW IDLE ROUGH IDLE/HUNTING IDLING VIBRATION SLOW/NO RETURN TO IDLE OVERHEATS/WATER TEMPERATURE HIGH EXCESSIVE FUEL CONSUMPTION EXCESSIVE OIL CONSUMPTION BATTERY DEAD (UNDER CHARGE)

EC

Reference

C

page

D

E

Warranty symptom code

AA AB AC AD AE AF AG AH AJ AK AL AM HA

Cooling Radiator/Hose/Radiator filler cap

CO-14

F

Thermostat

5

CO-12

Water pump Water gallery

55555

55

25

CO-10

G

EM-15,

CO-14

Cooling fan
Coolant level (low)/Contaminated coolant

5

CO-19

H

MA-16

NVIS (NISSAN Vehicle Immobilizer System -- NATS)

1

1

BL-96

I

1 - 6: The numbers refer to the order of inspection.
J

K

L

M

Revision: December 2006

EC-97

2006 Sentra

TROUBLE DIAGNOSIS Engine Control Component Parts Location

[QG18DE]
UBS00JSJ

Revision: December 2006

EC-98

BBIA0297E
2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-99

BBIA0522E
2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]

Revision: December 2006

EC-100

BBIA0143E
2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-101

BBIA0523E
2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]

Revision: December 2006

EC-102

BBIA0145E
2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]
A

EC

C

D

E

F
PBIB1211E
G
H

I

BBIA0193E

J

K

L

M

Revision: December 2006

EC-103

2006 Sentra

Vacuum Hose Drawing

TROUBLE DIAGNOSIS

[QG18DE]
UBS00NPE

Refer to EC-26, "System Diagram" for Vacuum Control System.

Revision: December 2006

EC-104

BBIA0524E
2006 Sentra

Circuit Diagram

TROUBLE DIAGNOSIS

[QG18DE]
UBS00JSL
A EC
C D E F G H I J K L M

Revision: December 2006

EC-105

BBWA2130E
2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]

Revision: December 2006

EC-106

BBWA2131E
2006 Sentra

TROUBLE DIAGNOSIS ECM Harness Connector Terminal Layout

[QG18DE]
UBS00JSM
A

EC

C

ECM Terminals and Reference Value
PREPARATION 1. ECM is located in the right side of the cowl top (behind the strut
tower).
2. Remove ECM harness protector.

MBIB0045E

D

UBS00JSN
E

F

G

3. When disconnecting ECM harness connector, loosen it with levers as far as they will go as show at right.
4. Connect a bread-out box (SST) and Y-cable adapter (SST) between the ECM and ECM harness connector.
G Use extreme care not to touch 2 pins at one time.
G Data is for comparison and may not be exact.

H
BBIA0191E
I
J
K

BBIA0138E

L

ECM INSPECTION TABLE

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

M

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

1

B

ECM ground

CONDITION
[Engine is running] G Idle speed

DATA (DC Voltage) Body ground

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

Revision: December 2006

EC-107

PBIB1584E
2006 Sentra

TROUBLE DIAGNOSIS

TERMINAL NO.
3

WIRE COLOR

ITEM

R/W

Throttle control motor power supply

CONDITION [Ignition switch: ON]

4

P

Throttle control motor (Close)

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully released

5

L

Throttle control motor (Open)

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully depressed

11 G/Y

[Engine is running] G Warm-up condition G Idle speed

Intake valve timing control solenoid valve

[Engine is running] G Warm-up condition G Engine speed: 2,000 rpm

[QG18DE]
DATA (DC Voltage)
BATTERY VOLTAGE (11 - 14V) 0 - 14V

0 - 14V

PBIB0534E

PBIB0533E
BATTERY VOLTAGE (11 - 14V)
7 - 10V

12 P 13 Y

Power steering pressure sensor
Crankshaft position sensor (POS)

[Engine is running] G Steering wheel: Being turned [Engine is running] G Steering wheel: Not being turned
[Engine is running] G Warm-up condition G Idle speed NOTE: The pulse cycle changes depending on rpm at idle.

0.5 - 4.0V 0.4 - 0.8V Approximately 3.0V
Approximately 3.0V

PBIB1790E PBIB0527E

[Engine is running] G Engine speed: 2,000 rpm

PBIB0528E

Revision: December 2006

EC-108

2006 Sentra

TROUBLE DIAGNOSIS

TERMINAL NO.

WIRE COLOR

ITEM

14 W/R

Camshaft position sensor (PHASE)

CONDITION
[Engine is running] G Warm-up condition G Idle speed
NOTE: The pulse cycle changes depending on rpm at idle.

[QG18DE]

DATA (DC Voltage)

A

1.0 - 4.0V
EC

1.0 - 4.0V

C
PBIB0525E
D

15 W

Knock sensor

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

22 G/B 23 R/B 41 L/B 42 Y/B

Fuel injector No. 3 Fuel injector No. 1 Fuel injector No. 4 Fuel injector No. 2

[Engine is running]

E

G Engine speed: 2,000 rpm.

F
PBIB0526E

[Engine is running] G Idle speed
[Engine is running] G Warm-up condition G Idle speed

Approximately 2.5V
G
Approximately 3.1V

Approximately 2.6V

2 - 3V

H

2 - 3V

[Engine is running]

BATTERY VOLTAGE

I

(11 - 14V)

G Warm-up condition

G Idle speed
NOTE: The pulse cycle changes depending on rpm at idle.

J
K
PBIB0529E

BATTERY VOLTAGE

(11 - 14V)

L

[Engine is running]

G Warm-up condition

G Engine speed: 2,000 rpm

M

25 W/B

Heated oxygen sensor 2 heater

32 L

EVAP control system pressure sensor

Revision: December 2006

[Engine is running] G Engine speed: Below 3,600 rpm after the
following conditions are met. ­ Engine: After warming up ­ Keeping the engine speed between 3,500
and 4,000 rpm for 1 minute and at idle for 1 minute under on load
[Ignition switch: ON] G Engine stopped. [Engine is running] G Engine speed: Above 3,600 rpm.

0 - 1.0V

PBIB0530E

BATTERY VOLTAGE (11 - 14V)

[Ignition switch: ON]

Approximately 1.8 - 4.8V

EC-109

2006 Sentra

TROUBLE DIAGNOSIS

TERMINAL NO.

WIRE COLOR

ITEM

34 Y/G

Intake air temperature sensor

CONDITION [Engine is running]

[Engine is running] G Idle speed G Accelerator pedal: Not depressed even
slightly, after engine starting.

[QG18DE]
DATA (DC Voltage)
Approximately 0 - 4.8V Output voltage varies with intake air temperature. BATTERY VOLTAGE (11 - 14V)

45

GY/L

EVAP canister purge volume control solenoid valve

Approximately 10V

PBIB0050E

[Engine is running]
G Engine speed: About 2,000 rpm (More than 100 seconds after starting engine)

47 B 48 R/W 49 R/Y
50 W
51 L/R

Sensor power supply (Throttle position sensor) Sensor power supply (EVAP control system pressure sensor) Sensor power supply (Refrigerant pressure sensor)
Throttle position sensor 1
Mass air flow sensor

[Ignition switch: ON]
[Ignition switch: ON]
[Ignition switch: ON]
[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully depressed [Engine is running] G Warm-up condition G Idle speed [Engine is running] G Warm-up condition G Engine speed: 2,500 rpm.

Approximately 5V

PBIB0520E

Approximately 5V

Approximately 5V

More than 0.36V

Less than 4.75V 0.9 - 1.2V 1.4 - 1.8V

Revision: December 2006

EC-110

2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]

TERMINAL NO.

WIRE COLOR

ITEM

61 L/W

Ignition signal No. 3

62 BR

Ignition signal No. 1

80 GY/R Ignition signal No. 4

81 PU

Ignition signal No. 2

CONDITION

DATA (DC Voltage)

A

[Engine is running]
G Warm-up condition
G Idle speed
NOTE: The pulse cycle changes depending on rpm at idle.

0 - 0.1V

0 - 0.2V

EC
C
PBIB0521E
D

[Engine is running]
E
G Warm-up condition G Engine speed: 2,000 rpm.

F
PBIB0522E

66 R

Sensor ground (Throttle position sensor)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

G

67 B/W

Sensor ground

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

H

68 G/R

Sensor power supply (Power steering pressure sensor)

[Ignition switch: ON]

Approximately 5V

I

[Ignition switch: ON]

G Engine stopped

J

Less than 4.75V

G Shift lever: D (A/T), 1st (M/T)

G Accelerator pedal: Fully released

69 G

Throttle position sensor 2

[Ignition switch: ON]

K

G Engine stopped G Shift lever: D (A/T), 1st (M/T)

More than 0.36V

G Accelerator pedal: Fully depressed

L

[Engine is running]

70 L

Refrigerant pressure sensor G Warm-up condition

1.0 - 4.0V

M

G Both A/C switch and blower switch: ON

(Compressor operates.)

73

BR/W

Engine coolant temperature sensor

[Engine is running]

Approximately 0 - 4.8V Output voltage varies with engine coolant temperature.

74 R/L

Heated oxygen sensor 2

[Engine is running]
G Revving engine from idle up to 3,000 rpm quickly after the following conditions are met.
­ Engine: After warming up
­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load.

0 - Approximately 1.0V

78 B

Sensor ground (Heated oxygen sensor)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

Revision: December 2006

EC-111

2006 Sentra

TROUBLE DIAGNOSIS

TERMINAL NO.

WIRE COLOR

ITEM

82 B/Y

Sensor ground (Accelerator pedal position sensor 1)

83 G

Sensor ground (Accelerator pedal position sensor 2)

84 PU

Electrical load signal (Headlamp signal)

85 LG 86 Y

DATA link connector CAN communication line

89

LG/B

Cooling fan relay-2 (High)

90 R 91 R/G

Sensor power supply (Accelerator pedal position sensor 1)
Sensor power supply (Accelerator pedal position sensor 2)

93 L/W

Electrical load signal (Rear window defogger signal)

94 L

CAN communication line

96 Y/G

Electrical load signal (Heater fan signal)

97 LG/R Cooling fan relay-1 (Low)

98 R/B

Accelerator pedal position sensor 2

CONDITION
[Engine is running] G Warm-up condition G Idle speed [Engine is running] G Warm-up condition G Idle speed [Lighting switch: ON] G Lighting switch: 2nd position [Lighting switch: ON] G Lighting switch: OFF [Ignition switch: ON] G CONSULT-II or GST: Disconnected. [Ignition switch: ON] [Engine is running] G Cooling fan: Not operating [Engine is running] G Cooling fan: High speed operating
[Ignition switch: ON]
[Ignition switch: ON]
[Ignition switch: ON] G Rear window defogger switch: ON [Ignition switch: ON] G Rear window defogger switch: OFF [Ignition switch: ON] [Engine is running] G Heater fan switch: ON [Engine is running] G Heater fan switch: OFF [Ignition switch: ON] G Cooling fan: Not operating [Ignition switch: ON] G Cooling fan: Operating [Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully depressed

[QG18DE]
DATA (DC Voltage)
Approximately 0V
Approximately 0V
BATTERY VOLTAGE (11 - 14V) Approximately 0V BATTERY VOLTAGE (11 - 14V) Approximately 2.3V BATTERY VOLTAGE (11 - 14V) 0 - 1.0V
Approximately 5V
Approximately 5V BATTERY VOLTAGE (11 - 14V) Approximately 0V Approximately 2.8V Approximately 0V
Approximately 5V BATTERY VOLTAGE (11 - 14V) 0 - 1.0V
0.28 - 0.48V
More than 2.0V

Revision: December 2006

EC-112

2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

A

[Ignition switch: ON]

G ASCD steering switch: OFF

Approximately 4V

EC

99 W/R

ASCD steering switch

[Ignition switch: ON] G MAIN switch: Pressed [Ignition switch: ON] G CANCEL switch: Pressed

Approximately 0V
C
Approximately 1V

[Ignition switch: ON]

Approximately 3V

D

G RESUME/ACCELERATE switch: Pressed

[Ignition switch: ON]

Approximately 2V

G SET/COAST switch: Pressed

E

101 R/G

Stop lamp switch

[Ignition switch: OFF] G Brake pedal: Fully released [Ignition switch: OFF]

Approximately 0V

BATTERY VOLTAGE

F

G Brake pedal: Slightly depressed

(11 - 14V)

[Ignition switch: ON] G Gear position: P or N

Approximately 0V

G

102 G/OR PNP switch

A/T models

[Ignition switch: ON]

BATTERY VOLTAGE

(11 - 14V)

H

G Except the above gear position

M/T models

Approximately 5V

104 P

Throttle control motor relay

[Ignition switch: OFF] [Ignition switch: ON]

BATTERY VOLTAGE

I

(11 - 14V)

0 - 1.0V

106 W 107 OR 108 P/L

[Ignition switch: ON]

J

G Engine stopped

0.65 - 0.87V

Accelerator pedal position G Accelerator pedal: Fully released

sensor 1

[Ignition switch: ON]

K

G Engine stopped

More than 4.3V

G Accelerator pedal: Fully depressed

Fuel tank temperature sensor

[Engine is running]

L
Approximately 0 - 4.8V Output voltage varies with fuel tank temperature.

[Ignition switch: ON]

M

ASCD brake switch

G Brake pedal: Slightly depressed (A/T) G Clutch pedal and/or brake pedal: Slightly
depressed (M/T)
[Ignition switch: ON]

Approximately 0V

G Brake pedal: Fully released (A/T)
G Clutch pedal and brake pedal: Fully released (M/T)

BATTERY VOLTAGE (11 - 14V)

109 B/R

Ignition switch

[Ignition switch: OFF] [Ignition switch: ON]

0V
BATTERY VOLTAGE (11 - 14V)

Revision: December 2006

EC-113

2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]

TERMINAL NO.

WIRE COLOR

ITEM

111 W/G

ECM relay (Self shut-off)

113 B/P

Fuel pump relay

115 B 116 B
117 L/Y
119 R/G 120 R/G
121 W/L

ECM ground
EVAP canister vent control valve
Power supply for ECM
Power supply for ECM (Back-up)

CONDITION

DATA (DC Voltage)

[Engine is running] [Ignition switch: OFF]
G For a few seconds after turning ignition switch OFF

0 - 1.0V

[Ignition switch: OFF]
G More than a few seconds after turning ignition switch OFF

BATTERY VOLTAGE (11 - 14V)

[Ignition switch: ON] G For 1 second after turning ignition switch
ON
[Engine is running]

0 - 1.0V

[Ignition switch: ON]
G More than 1 second after turning ignition switch ON.

BATTERY VOLTAGE (11 - 14V)

[Engine is running] G Idle speed

Body ground

[Ignition switch: ON]

BATTERY VOLTAGE (11 - 14V)

[Ignition switch: ON]

BATTERY VOLTAGE (11 - 14V)

[Ignition switch: OFF]

BATTERY VOLTAGE (11 - 14V)

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Revision: December 2006

EC-114

2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]

CONSULT-II Function (ENGINE)
Diagnostic test mode

Function

UBS00JSO
A

Work support Self-diagnostic results

This mode enables a technician to adjust some devices faster and more accurately by following the

indications on the CONSULT-II unit.

EC

Self-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame data

can be read and erased quickly.*

Data monitor Data monitor (SPEC)

Input/Output data in the ECM can be read.

C

Input/Output of the specification for Basic fuel schedule, AFM, A/F feedback control value and the other data monitor items can be read.

CAN diagnostic support monitor

The results of transmit/receive diagnosis of CAN communication can be read.

D

Active test Function test

Diagnostic Test Mode in which CONSULT-II drives some actuators apart from the ECMs and also

shifts some parameters in a specified range.

E

This mode is used to inform customers when their vehicle condition requires periodic maintenance.

DTC & SRT confirmation

The status of system monitoring tests and the self-diagnosis status/result can be confirmed.

ECM part number

ECM part number can be read.

F

*: The following emission-related diagnostic information is cleared when the ECM memory is erased.

1. Diagnostic trouble codes

2. 1st trip diagnostic trouble codes

G

3. Freeze frame data

4. 1st trip freeze frame data

H

5. System readiness test (SRT) codes

6. Test values

I

J

K

L

M

Revision: December 2006

EC-115

2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]

ENGINE CONTROL COMPONENT PARTS/CONTROL SYSTEMS APPLICATION

DIAGNOSTIC TEST MODE

Item

WORK SUPPORT

SELF-DIAGNOSTIC RESULTS

DTC*1

FREEZE FRAME DATA*2

DATA MONITOR

DATA MONITOR (SPEC)

ACTIVE TEST

DTC & SRT CONFIRMATION

SRT STATUS

DTC WORK SUPPORT

Crankshaft position sensor (POS)

×

×

×

×

Camshaft position sensor (PHASE)

×

×

×

×

Mass air flow sensor

×

×

×

Engine coolant temperature sensor

×

×

×

×

×

A/F sensor 1 Heated oxygen sensor 2

×

×

×

×

×

×

×

×

×

Vehicle speed sensor

×

×

×

×

Accelerator pedal position sensor

×

Throttle position sensor

×

×

×

×

×

ENGINE CONTROL COMPONENT PARTS INPUT

Fuel tank temperature sensor

×

×

×

×

EVAP control system pressure sensor

×

×

×

Intake air temperature sensor

×

×

×

×

Knock sensor Refrigerant pressure sensor

×

×

×

Closed throttle position switch (accelerator pedal position sensor signal)

×

×

Air conditioner switch

×

×

Park/neutral position (PNP) switch

×

×

×

Stop lamp switch

×

×

×

Power steering pressure sensor

×

×

×

Battery voltage Load signal

×

×

×

×

Fuel level sensor

×

×

×

ASCD steering switch

×

×

×

ASCD brake switch

×

×

×

ASCD clutch switch

×

×

×

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TROUBLE DIAGNOSIS

[QG18DE]

Item Fuel injector

WORK SUPPORT

DIAGNOSTIC TEST MODE

SELF-DIAGNOSTIC

A
DTC & SRT

RESULTS

DTC*1

FREEZE FRAME DATA*2

DATA MONITOR

DATA MONITOR (SPEC)

ACTIVE TEST

CONFIRMATION

SRT STATUS

DTC WORK SUPPORT

EC

×

×

×

C

Power transistor (Ignition timing)

×

×

×

ENGINE CONTROL COMPONENT PARTS OUTPUT

Throttle control motor relay

×

×

×

D

Throttle control motor

×

EVAP canister purge volume control solenoid valve

×

×

×

×

×

E

Air conditioner relay

×

×

Fuel pump relay

×

×

×

×

F

Cooling fan relay

×

×

×

×

A/F sensor 1 heater Heated oxygen sensor 2 heater

×

×

×

×*3

×

×

×

×*3

G

EVAP canister vent control valve

×

×

×

×

×

Intake valve timing control solenoid valve

×

×

×

×

H

Calculated load value

×

×

×

X: Applicable

I

*1: This item includes 1st trip DTCs.

*2: This mode includes 1st trip freeze frame data or freeze frame data. The items appear on CONSULT-II screen in freeze frame data

mode only if a 1st trip DTC or DTC is detected. For details, refer to EC-55 .

*3: Always "CMPLT" is displayed.

J

INSPECTION PROCEDURE

1. Turn ignition switch OFF.

K

2. Connect CONSULT-II and CONSULT-II CONVERTER to data

link connector, which is located under LH dash panel near the

fuse box cover. L
3. Turn ignition switch ON.

M

LAT136
4. Touch "START" (NISSAN BASED VHCL).

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EC-117

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TROUBLE DIAGNOSIS
5. Touch "ENGINE". If "ENGINE" is not indicated, go to GI-38, "CONSULT-II Data Link Connector (DLC) Circuit" .

[QG18DE]

6. Perform each diagnostic test mode according to each service procedure.
For further information, see the CONSULT-II Operation Manual.

BCIA0030E

BCIA0031E

WORK SUPPORT MODE Work Item

WORK ITEM

CONDITION

USAGE

FUEL PRESSURE RELEASE

G FUEL PUMP WILL STOP BY TOUCHING "START" DUR- When releasing fuel pressure

ING IDLING.

from fuel line

CRANK A FEW TIMES AFTER ENGINE STALLS.

IDLE AIR VOL LEARN

G THE IDLE AIR VOLUME THAT KEEPS THE ENGINE WITHIN THE SPECIFIED RANGE IS MEMORIZED IN ECM.

When learning the idle air volume

SELF-LEARNING CONT

G THE COEFFICIENT OF SELF-LEARNING CONTROL When clearing the coefficient of MIXTURE RATIO RETURNS TO THE ORIGINAL COEF- self-learning control value FICIENT.

EVAP SYSTEM CLOSE

CLOSE THE EVAP CANISTER VENT CONTROL VALVE IN ORDER TO MAKE EVAP SYSTEM CLOSE UNDER THE FOLLOWING CONDITIONS.
G IGN SW ON
G ENGINE NOT RUNNING
G AMBIENT TEMPERATURE IS ABOVE 0°C (32°F).
G NO VACUUM AND NO HIGH PRESSURE IN EVAP SYSTEM
G FUEL TANK TEMP. IS MORE THAN 0°C (32°F).
G WITHIN 10 MINUTES AFTER STARTING "EVAP SYSTEM CLOSE"
G WHEN TRYING TO EXECUTE "EVAP SYSTEM CLOSE" UNDER THE CONDITION EXCEPT ABOVE, CONSULTII WILL DISCONTINUE IT AND DISPLAY APPROPRIATE INSTRUCTION.
NOTE: WHEN STARTING ENGINE, CONSULT-II MAY DISPLAY "BATTERY VOLTAGE IS LOW. CHARGE BATTERY", EVEN IN USING CHARGED BATTERY.

When detecting EVAP vapor leak point of EVAP system

VIN REGISTRATION

G IN THIS MODE, VIN IS REGISTERED IN ECM

When registering VIN in ECM

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TROUBLE DIAGNOSIS

[QG18DE]

WORK ITEM TARGET IDLE RPM ADJ* TARGET IGN TIM ADJ*

G IDLE CONDITION G IDLE CONDITION

CONDITION

*: This function is not necessary in the usual service procedure.

USAGE
A
When setting target idle speed
When adjusting target ignition timing
EC

SELF-DIAG RESULTS MODE

Self Diagnostic Item

C

Regarding items of "DTC and 1st trip DTC", refer to EC-52, "Emission-related Diagnostic Information" .

Freeze Frame Data and 1st Trip Freeze Frame Data

D

Freeze frame data item*

Description

DIAG TROUBLE CODE [PXXXX]

G The engine control component part/control system has a trouble code, it is displayed as "PXXXX". (Refer

E

to EC-14, "INDEX FOR DTC" .)

G "Fuel injection system status" at the moment a malfunction is detected is displayed.

F

G One mode in the following is displayed.

FUEL SYS-B1

"Mode2": Open loop due to detected system malfunction "Mode3": Open loop due to driving conditions (power enrichment, deceleration enleanment)

"Mode4": Closed loop - using oxygen sensor(s) as feedback for fuel control

G

"Mode5": Open loop - has not yet satisfied condition to go to closed loop

CAL/LD VALUE [%] G The calculated load value at the moment a malfunction is detected is displayed.

COOLANT TEMP [°C] or [°F]

G The engine coolant temperature at the moment a malfunction is detected is displayed.

H

G "Long-term fuel trim" at the moment a malfunction is detected is displayed.

L-FUEL TRM-B1 [%] G The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule

I

than short-term fuel trim.

G "Short-term fuel trim" at the moment a malfunction is detected is displayed.

S-FUEL TRM-B1 [%] G The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel

J

schedule.

ENGINE SPEED [rpm]

G The engine speed at the moment a malfunction is detected is displayed.

K

VEHICL SPEED [km/ h] or [mph]

G The vehicle speed at the moment a malfunction is detected is displayed.

B/FUEL SCHDL [msec]

G The base fuel schedule at the moment a malfunction is detected is displayed.

L

INT/A TEMP SE [°C] or [°F]

G The intake air temperature at the moment a malfunction is detected is displayed.

M

*: The items are the same as those of 1st trip freeze frame data.

DATA MONITOR MODE Monitored Item

×: Applicable

Monitored item [Unit]

ECM INPUT SIGNALS

MAIN SIGNALS

Description

Remarks

G Accuracy becomes poor if engine speed

G Indicates the engine speed computed

drops below the idle rpm.

ENG SPEED [rpm]

×

×

from the signals of the crankshaft position sensor (POS) and camshaft position G If the signal is interrupted while the

sensor (PHASE).

engine is running, an abnormal value

may be indicated.

MAS A/F SE-B1 [V]

×

×

G The signal voltage of the mass air flow sensor is displayed.

G When the engine is stopped, a certain value is indicated.

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TROUBLE DIAGNOSIS

[QG18DE]

Monitored item [Unit]
B/FUEL SCHDL [msec]
A/F ALPHA-B1 [%]
COOLAN TEMP/S [°C] or [°F]
A/F SEN1 (B1) [V] HO2S2 (B1) [V]
HO2S2 MNTR (B1) [RICH/LEAN]
VHCL SPEED SE [km/h] or [mph] BATTERY VOLT [V] ACCEL SEN 1 [V] ACCEL SEN 2 [V] THRTL SEN 1 [V] THRTL SEN 2 [V] FUEL T/TMP SE [°C] or [°F] VEHICLE SPEED [km/h] or [MPH] INT/A TEMP SE [°C] or [°F] EVAP SYS PRES [V] FUEL LEVEL SE [V] START SIGNAL [ON/ OFF] CLSD THL POS [ON/ OFF]

ECM INPUT SIGNALS
×
× ×
×
× × × × × × × × × × × × ×

MAIN SIGNALS
× × × ×
× × × ×
×
× ×

Description

Remarks

G "Base fuel schedule" indicates the fuel injection pulse width programmed into ECM, prior to any learned on board correction.

G The mean value of the air-fuel ratio feedback correction factor per cycle is indicated.

G When the engine is stopped, a certain value is indicated.
G This data also includes the data for the air-fuel ratio learning control.

G The engine coolant temperature (determined by the signal voltage of the engine coolant temperature sensor) is displayed.

G When the engine coolant temperature sensor is open or short-circulated, ECM enters fail-safe mode. The engine coolant temperature determined by the ECM is displayed.

G The A/F signal computed from the input signal of the A/F sensor 1 is displayed.

G The signal voltage of the heated oxygen sensor 2 is displayed.

G Display of heated oxygen sensor 2 signal: RICH... means the amount of oxygen after three way catalyst is relatively small. LEAN... means the amount of oxygen after three way catalyst is relatively large.

G When the engine is stopped, a certain value is indicated.

G The vehicle speed computed from the vehicle speed signal sent from combination meter is displayed.

G The power supply voltage of ECM is displayed.

G The accelerator pedal position sensor signal voltage is displayed.

G ACCEL SEN 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.

G The throttle position sensor signal voltage is displayed.

G THRTL SEN 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.

G The fuel temperature (determined by the signal voltage of the fuel tank temperature sensor) is displayed.

G Indicates the vehicle speed computed from the revolution sensor signal.

G The intake air temperature (determined by the signal voltage of the intake air temperature sensor) is indicated.

G The signal voltage of EVAP control system pressure sensor is displayed.

G The signal voltage of the fuel level sensor is displayed.

G Indicates [ON/OFF] condition from the starter signal.

G After starting the engine, [OFF] is displayed regardless of the starter signal.

G Indicates idle position [ON/OFF] computed by ECM according to the accelerator pedal position sensor signal.

Revision: December 2006

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TROUBLE DIAGNOSIS

[QG18DE]

Monitored item [Unit]

ECM INPUT SIGNALS

MAIN SIGNALS

Description

A
Remarks

AIR COND SIG [ON/ OFF]

×

G Indicates [ON/OFF] condition of the air

×

conditioner switch as determined by the

air conditioner signal.

EC

P/N POSI SW [ON/OFF]

×

×

G Indicates [ON/OFF] condition from the park/neutral position (PNP) switch signal.

C

G [ON/OFF] condition of the power steering

PW/ST SIGNAL [ON/ OFF]

×

×

pressure sensor as determined by the power steering pressure sensor signal is

D

indicated.

G Indicates [ON/OFF] condition from the

electrical load signal.

E

LOAD SIGNAL [ON/ OFF]

×

ON... Rear window defogger switch is

×

ON and/or lighting switch is in 2nd posi-

tion.

OFF... Both rear window defogger switch

F

and lighting switch are OFF.

IGNITION SW [ON/OFF]

×

G Indicates [ON/OFF] condition from ignition switch.

G

HEATER FAN SW [ON/OFF]

×

G Indicates [ON/OFF] condition from the heater fan switch signal.

BRAKE SW [ON/OFF]

×

G Indicates [ON/OFF] condition from the stop lamp switch signal.

H

INJ PULSE-B1 [msec]

×

G Indicates the actual fuel injection pulse width compensated by ECM according to the input signals.

G When the engine is stopped, a certain computed value is indicated.

I

IGN TIMING [BTDC] CAL/LD VALUE [%] MASS AIRFLOW [g·m/s]
PURG VOL C/V [%]

×

G Indicates the ignition timing computed by G When the engine is stopped, a certain

ECM according to the input signals.

value is indicated.

J

G "Calculated load value" indicates the

value of the current airflow divided by

peak airflow.

G Indicates the mass airflow computed by

K

ECM according to the signal voltage of

the mass air flow sensor.

G Indicates the EVAP canister purge vol-

L

ume control solenoid valve control value

computed by the ECM according to the

input signals.
M
G The opening becomes larger as the

value increases.

INT/V TIM (B1) [°CA]

G Indicates [°CA] of intake camshaft advanced angle.

INT/V SOL (B1) [%]

G The control value of the intake valve timing control solenoid valve (determined by ECM according to the input signal) is indicated.
G The advance angle becomes larger as the value increases.

AIR COND RLY [ON/ OFF]

G The air conditioner relay control condition

×

(determined by ECM according to the

input signals) is indicated.

FUEL PUMP RLY [ON/OFF]

G Indicates the fuel pump relay control con-

×

dition determined by ECM according to

the input signals.

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TROUBLE DIAGNOSIS

Monitored item [Unit]

ECM INPUT SIGNALS

VENT CONT/V [ON/ OFF]

THRTL RELAY [ON/ OFF]

COOLING FAN [HI/LOW/OFF]

HO2S2 HTR (B1) [ON/OFF]

IDL A/V LEARN [YET/ CMPLT]
TRVL AFTER MIL [km] or [mile]
A/F S1 HTR (B1) [%]

AC PRESS SEN [V]

×

VHCL SPEED SE [km/h] or [mph]
SET VHCL SPD [km/h] or [mph] MAIN SW [ON/OFF] CANCEL SW [ON/OFF] RESUME/ACC SW [ON/OFF]
SET SW [ON/OFF]
BRAKE SW1 [ON/OFF]
BRAKE SW2 [ON/OFF]

MAIN SIGNALS
×

Description
G The control condition of the EVAP canister vent control valve (determined by ECM according to the input signals) is indicated. ON... Closed OFF... Open
G Indicates the throttle control motor relay control condition determined by the ECM according to the input signals.
G Indicates the condition of the cooling fan (determined by ECM according to the input signals). HI... High speed operation LOW... Low speed operation OFF... Stop
G Indicates [ON/OFF] condition of heated oxygen sensor 2 heater determined by ECM according to the input signals.
G Display the condition of idle air volume learning YET... Idle air volume learning has not been performed yet. CMPLT... Idle air volume learning has already been performed successfully.
G Distance traveled while MIL is activated.
G Indicates A/F sensor 1 heater control value computed by ECM according to the input signals.
G The current flow to the heater becomes larger as the value increases.
G The signal voltage from the refrigerant pressure sensor is displayed.
G The vehicle speed computed from the vehicle speed signal sent from TCM is displayed.
G The preset vehicle speed is displayed.
G Indicates [ON/OFF] condition from MAIN switch signal.
G Indicates [ON/OFF] condition from CANCEL switch signal.
G Indicates [ON/OFF] condition from RESUME/ACCELERATE switch signal.
G Indicates [ON/OFF] condition from SET/ COAST switch signal.
G Indicates [ON/OFF] condition from ASCD brake switch signal, and ASCD clutch switch signal (M/T models).
G Indicates [ON/OFF] condition of stop lamp switch signal.

Revision: December 2006

EC-122

[QG18DE]
Remarks
2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]

Monitored item [Unit]

ECM INPUT SIGNALS

MAIN SIGNALS

Description

A
Remarks

G Indicates the vehicle cruise condition.

EC

NON... Vehicle speed is maintained at

VHCL SPD CUT

the ASCD set speed.

[NON/CUT]

CUT...Vehicle speed increased to exces-

sively high compared with the ASCD set

C

speed, and ASCD operation is cut off.

G Indicates the vehicle cruise condition.

NON... Vehicle speed is maintained at

D

LO SPEED CUT [NON/CUT]

the ASCD set speed. CUT...Vehicle speed decreased to excessively low compared with the

ASCD set speed, and ASCD operation is

E

cut off.

AT OD MONITOR [ON/OFF]

G Indicates [ON/OFF] condition of A/T O/D according to the input signal from the TCM.

G For M/T models always "OFF" is displayed.

F

AT OD CANCEL [ON/OFF]
CRUISE LAMP [ON/OFF]
SET LAMP [ON/OFF]

G Indicates [ON/OFF] condition of A/T O/D G For M/T models always "OFF" is dis-

cancel signal sent from the TCM.

played.

G

G Indicates [ON/OFF] condition of CRUISE

lamp determined by the ECM according

to the input signals.

G Indicates [ON/OFF] condition of SET

H

lamp determined by the ECM according

to the input signals.

Voltage [V]

I

Frequency [msec], [Hz] or [%] DUTY-HI DUTY-LOW PLS WIDTH-HI PLS WIDTH-LOW

G Only "#" is displayed if item is unable to

be measured.

G Voltage, frequency, duty cycle or pulse G Figures with "#"s are temporary ones.

J

width measured by the probe.

They are the same figures as an actual

piece of data which was just previously

measured.
K

DATA MONITOR (SPEC) MODE

Monitored Item

L

Monitored item [Unit]

ECM INPUT SIGNALS

MAIN SIGNALS

Description

Remarks

M

ENG SPEED [rpm]

×

G Indicates the engine speed computed from the signal of the crankshaft position sensor (POS) and camshaft position sensor (PHASE).

MAS A/F SE-B1 [V]

×

×

G The signal voltage of the mass air flow sensor specification is displayed.

G When engine is running specification range is indicated.

B/FUEL SCHDL [msec]

G "Base fuel schedule" indicates the fuel injection pulse width programmed into ECM, prior to any learned on board correction.

G When engine is running specification range is indicated.

A/F ALPHA-B1 [%]

G When engine is running specification

G The mean value of the air-fuel ratio feed- range is indicated.

×

back correction factor per cycle is indi-

cated.

G This data also includes the data for the

air-fuel ratio learning control.

NOTE: Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.

Revision: December 2006

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TROUBLE DIAGNOSIS

[QG18DE]

ACTIVE TEST MODE Test Item

TEST ITEM

CONDITION

JUDGEMENT

CHECK ITEM (REMEDY)

FUEL INJECTION

G Engine: Return to the original trouble condition
G Change the amount of fuel injection using CONSULT-II.

If trouble symptom disappears, see CHECK ITEM.

G Harness and connectors G Fuel injector G A/F sensor 1

IGNITION TIMING

G Engine: Return to the original trouble condition
G Timing light: Set
G Retard the ignition timing using CONSULT-II.

If trouble symptom disappears, see CHECK ITEM.

G Perform Idle Air Volume Learning.

POWER BALANCE

G Engine: After warming up, idle the engine.
G A/C switch OFF
G Shift lever: P or N (A/T), Neutral (M/T)
G Cut off each fuel injector signal one at a time using CONSULT-II.

Engine runs rough or dies.

G Harness and connectors G Compression G Fuel injector G Power transistor G Spark plug G Ignition coil

COOLING FAN*
ENG COOLANT TEMP
FUEL PUMP RELAY

G Ignition switch: ON G Turn the cooling fan "HI", "LOW"
and "OFF" with CONSULT-II.
G Engine: Return to the original trouble condition
G Change the engine coolant temperature using CONSULT-II.
G Ignition switch: ON (Engine stopped)
G Turn the fuel pump relay "ON" and "OFF" using CONSULT-II and listen to operating sound.

Cooling fan moves and stops.
If trouble symptom disappears, see CHECK ITEM.

G Harness and connectors G Cooling fan relay G Cooling fan motor
G Harness and connectors G Engine coolant temperature sen-
sor G Fuel injector

Fuel pump relay makes the operat- G Harness and connectors

ing sound.

G Fuel pump relay

PURG VOL CONT/V

G Engine: After warming up, run engine at 1,500 rpm.
G Change the EVAP canister purge volume control solenoid valve opening percent using CONSULT-II.

Engine speed changes according to the opening percent.

G Harness and connectors G Solenoid valve

FUEL/T TEMP SEN
VENT CONTROL/V

G Change the fuel tank temperature using CONSULT-II.

G Ignition switch: ON (Engine stopped)
G Turn solenoid valve "ON" and "OFF" with the CONSULT-II and listen to operating sound.

Solenoid valve makes an operating G Harness and connectors

sound.

G Solenoid valve

V/T ASSIGN ANGLE

G Engine: Return to the original trouble condition
G Change intake valve timing using CONSULT-II.

If trouble symptom disappears, see CHECK ITEM.

G Harness and connectors
G Intake valve timing control solenoid valve

*: Leaving cooling fan OFF with CONSULT-II while engine is running may cause the engine to overheat.

DTC & SRT CONFIRMATION MODE SRT STATUS Mode For details, refer to EC-56, "SYSTEM READINESS TEST (SRT) CODE" .

SRT WORK SUPPORT Mode This mode enables a technician to drive a vehicle to set the SRT while monitoring the SRT status.

Revision: December 2006

EC-124

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TROUBLE DIAGNOSIS

DTC WORK SUPPORT Mode

Test mode

Test item

Corresponding DTC No.

EVAPORATIVE SYSTEM

EVP SML LEAK P0442/P1442*
EVP V/S LEAK P0456/P1456* PURG VOL CN/V P1444

P0442 P0455 P0456 P0443

PURG FLOW P0441

P0441

A/F SEN1

A/F SEN1 (B1) P1278/P1279 A/F SEN1 (B1) P1276

P0133 P0130

HO2S2 (B1) P1146

P0138

HO2S

HO2S2 (B1) P1147

P0137

HO2S2 (B1) P0139

P0139

*: DTC P1442 and P1456 does not apply to B15 models but appears in DTC Work Support Mode screens.

[QG18DE]

Reference page

A

EC-346

EC
EC-407

EC-354

EC-340

C

EC-241

EC-220

D

EC-259

EC-251

EC-269

E

F

G

H

I

J

K

L

M

Revision: December 2006

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TROUBLE DIAGNOSIS

[QG18DE]

REAL TIME DIAGNOSIS IN DATA MONITOR MODE (RECORDING VEHICLE DATA)

Description

CONSULT-II has two kinds of triggers and they can be selected by touching "SETTING" in "DATA MONITOR" mode.

1. "AUTO TRIG" (Automatic trigger):

G The malfunction will be identified on the CONSULT-II screen in real time. In other words, DTC/1st trip DTC and malfunction item will be displayed if the malfunction is detected by ECM. At the moment a malfunction is detected by ECM, "MONITOR" in "DATA MONITOR" screen is changed to "Recording Data ... xx%" as shown at right, and the data after the malfunction detection is recorded. Then when the percentage reached 100%, "REAL-TIME DIAG" screen is displayed. If "STOP" is touched on the screen during "Recording Data ... xx%", "REAL-TIME DIAG" screen is also displayed. The recording time after the malfunction detection and the recording speed can be changed by "TRIGGER POINT" and "Recording Speed". Refer to CONSULT-II OPERATION MANUAL.

PBIB1593E

2. "MANU TRIG" (Manual trigger):

G DTC/1st trip DTC and malfunction item will not be displayed automatically on CONSULT-II screen even though a malfunction is detected by ECM. DATA MONITOR can be performed continuously even though a malfunction is detected.

SEF707X
Operation 1. "AUTO TRIG"
G While trying to detect the DTC/1st trip DTC by performing the DTC Confirmation Procedure, be sure to select to "DATA MONITOR (AUTO TRIG)" mode. You can confirm the malfunction at the moment it is detected.
G While narrowing down the possible causes, CONSULT-II should be set in "DATA MONITOR (AUTO TRIG)" mode, especially in case the incident is intermittent. When you are inspecting the circuit by gently shaking (or twisting) the suspicious connectors, components and harness in the DTC Confirmation Procedure, the moment a malfunction is found the DTC/1st trip DTC will be displayed. (Refer to "Incident Simulation Tests" in GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident" .)
2. "MANU TRIG"
G If the malfunction is displayed as soon as "DATA MONITOR" is selected, reset CONSULT-II to "MANU TRIG". By selecting "MANU TRIG" you can monitor and store the data. The data can be utilized for further diagnosis, such as a comparison with the value for the normal operating condition.

Revision: December 2006

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TROUBLE DIAGNOSIS

[QG18DE]
A

EC

C

D

E

F

G

Generic Scan Tool (GST) Function
DESCRIPTION
Generic Scan Tool (OBDII scan tool) complying with SAE J1978 has 8 different functions explained below. ISO9141 is used as the protocol. The name "GST" or "Generic Scan Tool" is used in this service manual.

H
PBIB0197E
I
UBS00JSP
J
K
L

FUNCTION
Diagnostic service Service $01 READINESS TESTS
Service $02 (FREEZE DATA)
Service $03 DTCs

SEF139P

M

Function
This diagnostic service gains access to current emission-related data values, including analog inputs and outputs, digital inputs and outputs, and system status information.
This diagnostic service gains access to emission-related data value which were stored by ECM during the freeze frame. For details, refer to EC-55, "FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA" .
This diagnostic service gains access to emission-related power train trouble codes which were stored by ECM.

Revision: December 2006

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TROUBLE DIAGNOSIS

[QG18DE]

Diagnostic service Service $04 CLEAR DIAG INFO
Service $06 (ON BOARD TESTS) Service $07 (ON BOARD TESTS)

Service $08

--

Service $09 (CALIBRATION ID)

Function
This diagnostic service can clear all emission-related diagnostic information. This includes: G Clear number of diagnostic trouble codes (Service $01) G Clear diagnostic trouble codes (Service $03) G Clear trouble code for freeze frame data (Service $01) G Clear freeze frame data (Service $02) G Reset status of system monitoring test (Service $01) G Clear on board monitoring test results (Service $06 and $07)
This diagnostic service accesses the results of on board diagnostic monitoring tests of specific components/systems that are not continuously monitored.
This diagnostic service enables the off board test drive to obtain test results for emissionrelated powertrain components/systems that are continuously monitored during normal driving conditions.
This diagnostic service can close EVAP system in ignition switch ON position (Engine stopped). When this diagnostic service is performed, EVAP canister vent control valve can be closed. In the following conditions, this diagnostic service cannot function. G Low ambient temperature G Low battery voltage G Engine running G Ignition switch OFF G Low fuel temperature G Too much pressure is applied to EVAP system
This diagnostic service enables the off-board test device to request specific vehicle information such as Vehicle Identification Number (VIN) and Calibration IDs.

INSPECTION PROCEDURE 1. Turn ignition switch OFF. 2. Connect GST to data link connector, which is located under LH
dash panel near the fuse box cover.
3. Turn ignition switch ON.

4. Enter the program according to instruction on the screen or in the operation manual.
(*: Regarding GST screens in this section, sample screens are shown.)

Revision: December 2006

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LAT136
SEF398S
2006 Sentra

TROUBLE DIAGNOSIS
5. Perform each diagnostic service according to each service procedure.
For further information, see the GST Operation Manual of the tool maker.

[QG18DE]
A EC

C

CONSULT-II Reference Value in Data Monitor

SEF416S
D
UBS00JSQ

Remarks:

G Specification data are reference values.

G Specification data are output/input values which are detected or supplied by the ECM at the connector.

E

* Specification data may not be directly related to their components signals/values/operations.

(i.e., Adjust ignition timing with a timing light before monitoring IGN TIMING. Specification data might be displayed even when ignition

timing is not adjusted to specification. This IGN TIMING monitors the data calculated by the ECM according to the input signals from the

camshaft position sensor and other ignition timing related sensors.)

MONITOR ITEM

CONDITION

SPECIFICATION

F

ENG SPEED MAS A/F SE-B1

G Run engine and compare CONSULT-II value with the tachometer indica- Almost the same speed as the

tion.

tachometer indication.

G

See EC-134, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .

B/FUEL SCHDL

See EC-134, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .

A/F ALPHA-B1

See EC-134, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .

H

COOLAN TEMP/S G Engine: After warming up

More than 70°C (158°F)

A/F SEN1 (B1)

G Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5V

I

G Revving engine from idle to 3,000 rpm quickly after the following conditions are met.

HO2S2 (B1)

­ Engine: After warming up

0 - 0.3V  0.6 - 1.0V

J

­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load

G Revving engine from idle to 3,000 rpm quickly after the following condi-

K

tions are met.

HO2S2 MNTR (B1) ­ Engine: After warming up

LEAN  RICH

­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and

L

at idle for 1 minute under no load

VHCL SPEED SE

G Turn drive wheels and compare CONSULT-II value with the speedometer Almost the same speed as the

indication.

speedometer indication.

M

BATTERY VOLT

G Ignition switch: ON (Engine stopped)

11 - 14V

ACCEL SEN 1

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released
Accelerator pedal: Fully depressed

0.65 - 0.87V More than 4.3V

ACCEL SEN 2*

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released
Accelerator pedal: Fully depressed

0.56 - 0.96V More than 4.0V

THRTL SEN 1 THRTL SEN 2*

G Ignition switch: ON (Engine stopped)
G Shift lever: D (A/T), 1st (M/T)

Accelerator pedal: Fully released
Accelerator pedal: Fully depressed

More than 0.36V Less than 4.75V

EVAP SYS PRES

G Ignition switch: ON

1.8 - 4.8V

START SIGNAL

G Ignition switch: ON  START  ON

OFF  ON  OFF

CLSD THL POS

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released
Accelerator pedal: Slightly depressed

ON OFF

Revision: December 2006

EC-129

2006 Sentra

MONITOR ITEM AIR COND SIG P/N POSI SW PW/ST SIGNAL LOAD SIGNAL IGNITION SW HEATER FAN SW BRAKE SW INJ PULSE-B1
IGN TIMING
CAL/LD VALUE
MASS AIRFLOW
PURG VOL C/V
INT/V SOL (B1) AIR COND RLY FUEL PUMP RLY VENT CONT/V

TROUBLE DIAGNOSIS

[QG18DE]

CONDITION

G Engine: After warming up, idle the engine

A/C switch: OFF
A/C switch: ON (Compressor operates)

G Ignition switch: ON

Shift lever: P or N (A/T), Neutral (M/T)
Except above

G Engine: After warming up, idle the engine

Steering wheel: Not being turned
The steering wheel: Being is turned

G Ignition switch: ON

Rear window defogger switch and/or lighting switch is in 2nd
Rear window defogger switch is OFF and lighting switch is OFF

G Ignition switch: ON  OFF  ON

G Engine: After warming up, idle the engine

Heater fan is operating Heater fan is not operating

G Ignition switch: ON

Brake pedal: Fully released Brake pedal: Slightly depressed

G Engine: After warming up G Air conditioner switch: OFF G Shift lever: P or N (A/T), Neutral (M/T) G No load

Idle 2,000 rpm

G Engine: After warming up G Air conditioner switch: OFF G Shift lever: P or N (A/T), Neutral (M/T) G No load

Idle 2,000 rpm

G Engine: After warming up G Air conditioner switch: OFF G Shift lever: P or N (A/T), Neutral (M/T) G No load

Idle 2,500 rpm

G Engine: After warming up G Air conditioner switch: OFF G Shift lever: P or N (A/T), Neutral (M/T) G No load

Idle 2,500 rpm

G Engine: After warming up G Air conditioner switch: OFF G Shift lever: P or N (A/T), Neutral (M/T) G No load

Idle (Accelerator pedal is not depressed even slightly, after engine starting.)
2,000 rpm

G Engine: After warming up G Shift lever: P or N (A/T), Neutral (M/T) G Air conditioner switch: OFF G No load

Idle 2,000 rpm

G Air conditioner switch: OFF  ON

G Ignition switch is turned to ON (Operates for 1 seconds) G Engine running and cranking G When engine is stopped (Stops in 1 seconds)

G Except as shown above

G Ignition switch: ON

SPECIFICATION OFF ON ON OFF OFF ON ON OFF ON  OFF  ON ON OFF OFF ON 2.4 - 3.2 msec
1.9 - 3.2 msec
A/T 18°+5° BTDC M/T 7°±5° BTDC More than 25° BTDC 20.0 - 35.5%
12.0 - 30.0%
1.4 - 4.0 g·m/s
5.0 - 10.0 g·m/s
0%
-- 0% - 2%
Approx. 0% - 80%
OFF  ON
ON
OFF OFF

Revision: December 2006

EC-130

2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]

MONITOR ITEM THRTL RELAY

G Ignition switch: ON

CONDITION

SPECIFICATION
A
ON

INT/V TIM (B1)

G Engine: After warming up G Shift lever: P or N (A/T), Neutral (M/T) G Air conditioner switch: OFF G No load

Idle 2,000 rpm

­5° - 5°CA
EC
Approx. 0° - 30°CA

Engine coolant temperature: 94°C (201°F) or less

OFF

C

G After warming up engine, idle the

Engine coolant temperature:

COOLING FAN

engine. G Air conditioner switch: OFF

Between 95°C (203°F) and 104°C (219°F)

LOW

D

Engine coolant temperature: 105°C (221°F) or more

HIGH

E

G Engine speed: Above 3,600 rpm

OFF

G Engine speed: Below 3,600 rpm after the following conditions are met.

HO2S2 HTR (B1)

­ Engine: After warming up

ON

F

­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and

at idle for 1 minute under no load.

TRVL AFTER MIL G Ignition switch: ON

Vehicle has traveled after MIL

0 - 65,535 km

G

has turned ON

(0 - 40,723 mile)

A/F S1 HTR (B1)

G Engine: After warming up, idle the engine

0 - 100%

AC PRESS SEN

G Engine: Idle

1.0 - 4.0V

H

G Both A/C switch and blower fan switch: ON (Compressor operates)

VHCL SPEED SE

G Turn drive wheels and compare CONSULT-II value with the speedometer Almost the same speed as the

indication.

speedometer indication.

I

SET VHCL SPD

G Engine: Running

ASCD: Operating

The preset vehicle speed is displayed.

MAIN switch: Pressed

ON

J

MAIN SW

G Ignition switch: ON

MAIN switch: Released

OFF

CANCEL switch: Pressed

ON

CANCEL SW

G Ignition switch: ON

K

CANCEL switch: Released

OFF

RESUME/ACCELERATE switch: Pressed

ON

RESUME/ACC SW G Ignition switch: ON

L

RESUME/ACCELERATE switch: Released

OFF

SET SW

G Ignition switch: ON

SET/COAST switch: Pressed

ON

M

SET/COAST switch: Released OFF

BRAKE SW1

G Ignition switch: ON

Clutch pedal (M/T) and brake pedal: Fully released
Clutch pedal (M/T) and/or brake pedal: Depressed

ON OFF

BRAKE SW2

G Ignition switch: ON

Brake pedal: Fully released

OFF

Brake pedal: Slightly Depressed ON

CRUISE LAMP

G Ignition switch: ON

MAIN switch: Pressed at the 1st time  at the 2nd time

ON  OFF

SET LAMP

G MAIN switch: ON
G When vehicle speed is between 40 km/h (25 MPH) and 144 km/h (89 MPH)

ASCD: Operating ASCD: Not operating

ON OFF

*: Accelerator pedal position sensor 2 signal and throttle position sensor 2 signal are converted by ECM internally. Thus, they differ from ECM terminals voltage signal.

Revision: December 2006

EC-131

2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]

Major Sensor Reference Graph in Data Monitor Mode

UBS00JSR

The following are the major sensor reference graphs in "DATA MONITOR" mode.

CLSD THL POS, ACCEL SEN 1, THRTL SEN 1
Below is the data for "CLSD THL POS", "ACCEL SEN 1" and "THRTL SEN 1" when depressing the accelerator pedal with the ignition switch ON and with selector lever in D position (A/T models) or 1st position (M/T models). The signal of "ACCEL SEN 1" and "THRTL SEN 1" should rise gradually without any intermittent drop or rise after "CLSD THL POS" is changed from ON to OFF.

PBIB0198E
ENG SPEED, MAS A/F SE-B1, THRTL SEN 1, HO2S2 (B1), INJ PULSE-B1 Below is the data for "ENG SPEED", "MAS A/F SE-B1", "THRTL SEN 1", "HO2S2 (B1)" and "INJ PULSE-B1" when revving engine quickly up to 4,800 rpm under no load after warming up engine sufficiently. Each value is for reference, the exact value may vary.

PBIB2445E

Revision: December 2006

EC-132

2006 Sentra

TROUBLE DIAGNOSIS

[QG18DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-133

PBIB2099E
2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

[QG18DE]

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

PFP:00031

Description

UBS00JSS

The specification (SP) value indicates the tolerance of the value that is displayed in "DATA MONITOR (SPEC)" mode of CONSULT-II during normal operation of the Engine Control System. When the value in "DATA MONITOR (SPEC)" mode is within the SP value, the Engine Control System is confirmed OK. When the value in "DATA MONITOR (SPEC)" mode is NOT within the SP value, the Engine Control System may have one or more malfunctions. The SP value is used to detect malfunctions that may affect the Engine Control System, but will not light the MIL. The SP value will be displayed for the following three items:
G B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board correction)
G A/F ALPHA-B1 (The mean value of air-fuel ratio feedback correction factor per cycle)
G MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)

Testing Condition

UBS00JST

G Vehicle driven distance: More than 5,000 km (3,107 miles) G Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm2 , 14.25 - 15.12 psi) G Atmospheric temperature: 20 - 30°C (68 - 86°F) G Engine coolant temperature: 75 - 95°C (167 - 203°F) G Engine speed: Idle G Transmission: Warmed-up ­ A/T models: After the engine is warmed up to normal operating temperature, drive vehicle until "FLUID
TEMP SE" (A/T fluid temperature sensor signal) indicates more than 60°C (140°F). ­ M/T models: After the engine is warmed up to normal operating temperature, drive vehicle for 5 minutes. G Electrical load: Not applied ­ Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight
ahead.

Inspection Procedure

UBS00JSU

NOTE: Perform "DATA MONITOR (SPEC)" mode in maximum scale display. 1. Perform EC-73, "Basic Inspection" . 2. Confirm that the testing conditions indicated above are met. 3. Select "B/FUEL SCHDL", "A/F ALPHA-B1" and "MAS A/F SE-
B1" in "DATA MONITOR (SPEC)" mode with CONSULT-II. 4. Make sure that monitor items are within the SP value. 5. If NG, go toEC-135, "Diagnostic Procedure" .

SEF601Z

Revision: December 2006

EC-134

2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE
Diagnostic Procedure
OVERALL SEQUENCE

[QG18DE]
UBS00JSV
A EC
C D E F G H I J K L M

Revision: December 2006

EC-135

PBIB2318E
2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

[QG18DE]

Revision: December 2006

EC-136

PBIB2509E
2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE
DETAILED PROCEDURE
1. CHECK "A/F ALPHA-B1"
1. Start engine. 2. Confirm that the testing conditions are met. Refer to EC-134, "Testing Condition" . 3. Select "A/F ALPHA-B1" in "DATA MONITOR (SPEC)" mode,
and make sure that the indication is within the SP value. NOTE: Check "A/F ALPHA-B1" for approximately 1 minute because they may fluctuate. It is NG if the indication is out of the SP value even a little. OK or NG OK >> GO TO 17. NG (Less than the SP value)>>GO TO 2. NG (More than the SP value)>>GO TO 3.
2. CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within the SP value. OK or NG
OK >> GO TO 4. NG (More than the SP value)>>GO TO 19.

[QG18DE]
A EC
C D E
PBIB2369E
F G H

3. CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within the SP value. OK or NG
OK >> GO TO 6. NG (More than the SP value)>>GO TO 6. NG (Less than the SP value)>>GO TO 25.

I
PBIB2332E
J
K
L
M

4. CHECK "A/F ALPHA-B1"

PBIB2332E

1. Stop the engine. 2. Disconnect PCV hose, and then plug it. 3. Start engine. 4. Select "A/F ALPHA-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within
the SP value. OK or NG
OK >> GO TO 5. NG >> GO TO 6.

Revision: December 2006

EC-137

2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE
5. CHANGE ENGINE OIL

[QG18DE]

1. Stop the engine.
2. Change engine oil.
NOTE: This symptom may occur when a large amount of gasoline is mixed with engine oil because of driving conditions (such as when engine oil temperature does not rise enough since a journey distance is too short during winter). The symptom will not be detected after changing engine oil or changing driving condition.

>> INSPECTION END
6. CHECK FUEL PRESSURE
Check fuel pressure. (Refer to EC-82, "Fuel Pressure Check" .) OK or NG
OK >> GO TO 9. NG (Fuel pressure is too high)>>Replace fuel pressure regulator, refer to EM-21 . GO TO 8. NG (Fuel pressure is too low)>>GO TO 7.
7. DETECT MALFUNCTIONING PART
1. Check the following. ­ Clogged and bent fuel hose and fuel tube ­ Clogged fuel filter ­ Fuel pump and its circuit (Refer to EC-579 .) 2. If NG, repair or replace the malfunctioning part. (Refer to EC-82 .)
If OK, replace fuel pressure regulator.

>> GO TO 8.
8. CHECK "A/F ALPHA-B1"
1. Start engine. 2. Select "A/F ALPHA-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within
the SP value. OK or NG
OK >> INSPECTION END NG >> GO TO 9.
9. PERFORM POWER BALANCE TEST
1. Perform "POWER BALANCE" in "ACTIVE TEST" mode. 2. Make sure that the each cylinder produces a momentary engine
speed drop. OK or NG
OK >> GO TO 12. NG >> GO TO 10.

PBIB0133E

Revision: December 2006

EC-138

2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE
10. DETECT MALFUNCTIONING PART
1. Check the following. ­ Ignition coil and its circuit (Refer to EC-584 .) ­ Fuel injector and its circuit (Refer to EC-573 .) ­ Intake air leakage ­ Low compression pressure (Refer to EM-55 .) 2. If NG, repair or replace the malfunctioning part.
If OK, replace fuel injector. (It may be caused by leakage from fuel injector or clogging.)

[QG18DE]
A EC
C

D >> GO TO 11.

11. CHECK "A/F ALPHA-B1" E 1. Start engine.

2. Select "A/F ALPHA-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within

the SP value.

F

OK or NG

OK >> INSPECTION END

NG >> GO TO 12.

G

12. CHECK A/F SENSOR 1 FUNCTION

Perform all DTC Confirmation Procedure related with A/F sensor 1.

H

G For DTC P0130, refer to EC-220, "DTC Confirmation Procedure" .

G For DTC P0131, refer to EC-227, "DTC Confirmation Procedure" .

I

G For DTC P0132, refer to EC-234, "DTC Confirmation Procedure" .

G For DTC P0133, refer to EC-242, "DTC Confirmation Procedure" .

G For DTC P2A00, refer to EC-544, "Overall Function Check" .

J

OK or NG

OK >> GO TO 15.

NG >> GO TO 13.

K

13. CHECK A/F SENSOR 1 CIRCUIT

Perform Diagnostic Procedure according to corresponding DTC.

L

>> GO TO 14. M
14. CHECK "A/F ALPHA-B1"
1. Start engine. 2. Select "A/F ALPHA-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within
the SP value. OK or NG
OK >> INSPECTION END NG >> GO TO 15.
15. DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR
1. Stop the engine. 2. Disconnect ECM harness connector. Check pin terminal and connector for damage, and then reconnect it.

>> GO TO 16.

Revision: December 2006

EC-139

2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE
16. CHECK "A/F ALPHA-B1"

[QG18DE]

1. Start engine. 2. Select "A/F ALPHA-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within
the SP value. OK or NG
OK >> INSPECTION END NG >> Detect malfunctioning part according to EC-94, "Symptom Matrix Chart" .
17. CHECK "B/FUEL SCHDL"

Select "B/FUEL SCHDL" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within the SP value.
OK or NG
OK >> INSPECTION END NG (More than the SP value)>>GO TO 18. NG (Less than the SP value)>>GO TO 25.

18. DETECT MALFUNCTIONING PART
1. Check for the cause of large engine friction. Refer to the following. ­ Engine oil level is too high ­ Engine oil viscosity ­ Belt tension of power steering, alternator, A/C compressor, etc. is excessive ­ Noise from engine ­ Noise from transmission, etc. 2. Check for the cause of insufficient combustion. Refer to the following. ­ Valve clearance malfunction ­ Intake valve timing control function malfunction ­ Camshaft sprocket installation malfunction, etc.
>> Repair or replace malfunctioning part, and then GO TO 30.
19. CHECK INTAKE SYSTEM
Check for the cause of uneven air flow through mass air flow sensor. Refer to the following. G Crushed air ducts G Malfunctioning seal of air cleaner element G Uneven dirt of air cleaner element G Improper specification of intake air system OK or NG
OK >> GO TO 21. NG >> Repair or replace malfunctioning part, and then GO TO 20.

PBIB2332E

Revision: December 2006

EC-140

2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

[QG18DE]

20. CHECK "A/F ALPHA-B1" AND "B/FUEL SCHDL" A

Select "A/F ALPHA-B1" and "B/FUEL SCHDL" in "DATA MONITOR (SPEC)" mode, and make sure that the each indication is within the SP value.

OK or NG

EC

OK >> INSPECTION END NG ("B/FUEL SCHDL" is more, "A/F ALPHA-B1" is less than the SP value)>>GO TO 21.

21. DISCONNECT AND RECONNECT MASS AIR FLOW SENSOR HARNESS CONNECTOR

C

1. Stop the engine. 2. Disconnect mass air flow sensor harness connector. Check pin terminal and connector for damage and D
then reconnect it again.

E >> GO TO 22.

22. CHECK "A/F ALPHA-B1"
F
1. Start engine.

2. Select "A/F ALPHA-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within

the SP value.

G

OK or NG

OK >> 1. Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to EC-177 .

2. GO TO 29.

H

NG >> GO TO 23.

23. CHECK "MAS A/F SE-B1"

I

Select "MAS A/F SE-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within the SP value.
J OK or NG

OK >> GO TO 24.

NG (More than the SP value)>>Replace mass air flow sensor, and

then GO TO 29.

K

L

24. REPLACE ECM

PBIB2370E
M

1. Replace ECM. 2. Perform initialization of NVIS(NATS) system and registration of all NVIS(NATS) ignition key IDs. Refer to
BL-96, "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM -- NATS)" . 3. Perform EC-79, "VIN Registration" . 4. Perform EC-79, "Accelerator Pedal Released Position Learning" . 5. Perform EC-80, "Throttle Valve Closed Position Learning" . 6. Perform EC-80, "Idle Air Volume Learning" .

>> GO TO 29.

Revision: December 2006

EC-141

2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE
25. CHECK INTAKE SYSTEM

[QG18DE]

Check for the cause of uneven air flow through mass air flow sensor. Refer to the following. G Crushed air ducts G Malfunctioning seal of air cleaner element G Uneven dirt of air cleaner element G Improper specification of intake air system OK or NG
OK >> GO TO 27. NG >> Repair or replace malfunctioning part, and then GO TO 26.
26. CHECK "B/FUEL SCHDL"

Select "B/FUEL SCHDL" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within the SP value. OK or NG
OK >> INSPECTION END NG (Less than the SP value)>>GO TO 27.
27. CHECK "MAS A/F SE-B1"

Select "MAS A/F SE-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within the SP value.
OK or NG
OK >> GO TO 28. NG (Less than the SP value)>>Replace mass air flow sensor, and
then GO TO 30.

28. CHECK INTAKE SYSTEM

PBIB2370E

Check for the cause of air leak after the mass air flow sensor. Refer to the following. G Disconnection, looseness, and cracks in air duct G Looseness of oil filler cap G Disconnection of oil level gauge G Open stuck, breakage, hose disconnection, or cracks of PCV valve G Disconnection or cracks of EVAP purge hose, open stuck of EVAP canister purge volume control solenoid
valve G Malfunctioning seal of rocker cover gasket G Disconnection, looseness, or cracks of hoses, such as vacuum hose, connecting to intake air system
parts G Malfunctioning seal of intake air system, etc.

>> GO TO 30.
29. CHECK "A/F ALPHA-B1" AND "B/FUEL SCHDL"

Select "A/F ALPHA-B1" and "B/FUEL SCHDL" in "DATA MONITOR (SPEC)" mode, and make sure that the each indication is within the SP value.
OK or NG
OK >> INSPECTION END NG >> Detect malfunctioning part according to EC-94, "Symptom Matrix Chart" .

Revision: December 2006

EC-142

2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

[QG18DE]

30. CHECK "B/FUEL SCHDL" A

Select "B/FUEL SCHDL" in "DATA MONITOR (SPEC)" mode, and then make sure that the indication is within the SP value.

OK or NG

EC

OK >> INSPECTION END NG >> Detect malfunctioning part according to EC-94, "Symptom Matrix Chart" .

C

D

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-143

2006 Sentra

TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT
[QG18DE]

TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT

PFP:00006

Description

UBS00JSW

Intermittent incidents may occur. In many cases, the malfunction resolves itself (the part or circuit function returns to normal without intervention). It is important to realize that the symptoms described in the customer's complaint often do not recur on (1st trip) DTC visits. Realize also that the most frequent cause of intermittent incidents occurrences is poor electrical connections. Because of this, the conditions under which the incident occurred may not be clear. Therefore, circuit checks made as part of the standard diagnostic procedure may not indicate the specific malfunctioning area. Common intermittent incidents Report Situations

STEP in Work Flow

Situation

2

The CONSULT-II is used. The SELF-DIAG RESULTS screen shows time data other than 0 or [1t].

3 or 4

The symptom described by the customer does not recur.

5

(1st trip) DTC does not appear during the DTC Confirmation Procedure.

10

The Diagnostic Procedure for PXXXX does not indicate the malfunctioning area.

Diagnostic Procedure

UBS00JSX

1. INSPECTION START
Erase (1st trip) DTCs. Refer to EC-63, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" .

>> GO TO 2.
2. CHECK GROUND TERMINALS
Check ground terminals for corroding or loose connection. Refer to EC-151, "Ground Inspection" . OK or NG
OK >> GO TO 3. NG >> Repair or replace.
3. SEARCH FOR ELECTRICAL INCIDENT
Perform GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident" , "INCIDENT SIMULATION TESTS". OK or NG
OK >> GO TO 4. NG >> Repair or replace.
4. CHECK CONNECTOR TERMINALS
Refer to GI-23, "How to Check Terminal" , "HOW TO PROBE CONNECTORS", "How to Check Enlarged Contact Spring of Terminal". OK or NG
OK >> INSPECTION END NG >> Repair or replace connector.

Revision: December 2006

EC-144

2006 Sentra

POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT Wiring Diagram

[QG18DE]
PFP:24110
A
UBS00JSY
EC C D E
F G H I J K L M

Revision: December 2006

EC-145

BBWA2317E
2006 Sentra

POWER SUPPLY AND GROUND CIRCUIT

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

1B

ECM ground

109 B/R

Ignition switch

CONDITION
[Engine is running] G Idle speed [Ignition switch: OFF] [Ignition switch: ON]

111 W/G
115 B 116 B 119 R/G 120 R/G

ECM relay (Self shutoff)

[Engine is running] [Ignition switch: OFF] G For a few seconds after turning ignition switch
OFF
[Ignition switch: OFF] G More than a few seconds after turning ignition
switch OFF

ECM ground

[Engine is running] G Idle speed

Power supply for ECM

[Ignition switch: ON]

DATA (DC Voltage)
Body ground 0V BATTERY VOLTAGE (11 - 14V)
0 - 1.0V
BATTERY VOLTAGE (11 - 14V)
Body ground BATTERY VOLTAGE (11 - 14V)

Diagnostic Procedure
1. INSPECTION START

UBS00KJU

Start engine. Is engine running? Yes or No
Yes >> GO TO 11. No >> GO TO 2.
2. CHECK ECM POWER SUPPLY CIRCUIT-I

1. Turn ignition switch OFF and then ON. 2. Check voltage between ECM terminal 109 and ground with
CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 4. NG >> GO TO 3.

MBIB0015E

Revision: December 2006

EC-146

2006 Sentra

POWER SUPPLY AND GROUND CIRCUIT
3. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E10, F48 G Harness connectors M19, E108 G Fuse block (J/B) connector M1 G 10A fuse G Harness for open or short between ECM and fuse

[QG18DE]
A EC
C

>> Repair open circuit or short to ground or short to power in harness or connectors.

D

4. CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

E

2. Loosen and retighten two ground screws on the body. Refer to EC-151 .

F

G

OK or NG OK >> GO TO 5. NG >> Repair or replace ground connections.
5. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminals 1, 115, 116, and ground.
Refer to Wiring Diagram.
Continuity should exist. 4. Also check harness for short to power. OK or NG
OK >> GO TO 7. NG >> GO TO 6.
6. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors F26, M58 G Harness for open or short between ECM and ground
>> Repair open circuit or short to power in harness or connectors.

H
BBIA0515E
I J K L M

Revision: December 2006

EC-147

2006 Sentra

POWER SUPPLY AND GROUND CIRCUIT
7. CHECK ECM POWER SUPPLY CIRCUIT-II
1. Disconnect ECM relay.

[QG18DE]

2. Check voltage between ECM relay terminals 1, 6 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 9. NG >> GO TO 8.

BBIA0100E

8. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E10, F48 G Fuse and fusible link box connectors E22, E24 G 10A fuse G 15A fuse G Harness for open or short between ECM relay and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK ECM RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 111 and ECM relay terminal 2.
Continuity should exist. 2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 10. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
10. CHECK ECM RELAY
Refer to EC-151, "Component Inspection" . OK or NG
OK >> Go to EC-584, "IGNITION SIGNAL" . NG >> Replace ECM relay.

SEF420X

Revision: December 2006

EC-148

2006 Sentra

POWER SUPPLY AND GROUND CIRCUIT
11. CHECK ECM POWER SUPPLY CIRCUIT-III
1. Stop engine. 2. Turn ignition switch ON and then OFF. 3. Check voltage between ECM terminals 119, 120 and ground
with CONSULT-II or tester. Voltage: After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop to approximately 0V.
OK or NG OK >> GO TO 16. NG (Battery voltage does not exist.)>>GO TO 12. NG (Battery voltage exists for more than a few seconds.)>>GO TO 14.
12. CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Disconnect ECM harness connector. 2. Disconnect ECM relay.
3. Check voltage between ECM relay terminal 3 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 13. NG >> GO TO 12.
13. DETECT MALFUNCTIONING PART
Check the harness for open or short between ECM relay and harness connector F48.
>> Repair harness or connectors.

[QG18DE]
A EC
C D E
PBIB1630E
F G H I
BBIA0100E
J K L M
SEF860T

Revision: December 2006

EC-149

2006 Sentra

POWER SUPPLY AND GROUND CIRCUIT
14. CHECK ECM POWER SUPPLY CIRCUIT-V

[QG18DE]

1. Check harness continuity between ECM terminals 119, 120 and ECM relay terminal 5. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 15. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
15. CHECK ECM RELAY

Refer to EC-151, "Component Inspection" . OK or NG
OK >> GO TO 16. NG >> Replace ECM relay.
16. CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

OK or NG OK >> GO TO 17. NG >> Repair or replace ground connections.
17. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminals 1, 115, 116, and ground.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to power. OK or NG
OK >> GO TO 19. NG >> GO TO 18.
18. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors F26, M58 G Harness for open or short between ECM and ground

>> Repair open circuit or short to power in harness or connectors.

Revision: December 2006

EC-150

BBIA0515E
2006 Sentra

POWER SUPPLY AND GROUND CIRCUIT
19. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

[QG18DE]
A

>> INSPECTION END

EC

Component Inspection
ECM RELAY 1. Apply 12V direct current between ECM relay terminals 1 and 2.
2. Check continuity between relay terminals 3 and 5, 6 and 7.

UBS00NPF
C

Condition

Continuity

D

12V direct current supply between terminals 1 and 2

Yes

OFF

No

E

3. If NG, replace ECM relay.

F
PBIB0077E

Ground Inspection

UBS00JT0

Ground connections are very important to the proper operation of electrical and electronic circuits. Ground G

connections are often exposed to moisture, dirt and other corrosive elements. The corrosion (rust) can

become an unwanted resistance. This unwanted resistance can change the way a circuit works.

Electronically controlled circuits are very sensitive to proper grounding. A loose or corroded ground can drasti- H

cally affect an electronically controlled circuit. A poor or corroded ground can easily affect the circuit. Even

when the ground connection looks clean, there can be a thin film of rust on the surface.

When inspecting a ground connection follow these rules:PG-13, "Ground Distribution"

I

G Remove the ground bolt or screw.

G Inspect all mating surfaces for tarnish, dirt, rust, etc.

G Clean as required to assure good contact.

J

G Reinstall bolt or screw securely.

G Inspect for "add-on" accessories which may be interfering with the ground circuit. G If several wires are crimped into one ground eyelet terminal, check for proper crimps. Make sure all of the K

wires are clean, securely fastened and providing a good ground path. If multiple wires are cased in one

eyelet make sure no ground wires have excess wire insulation.

For detailed ground distribution information, refer to PG-13, "Ground Distribution" .

L

M

Revision: December 2006

EC-151

PBIB1870E
2006 Sentra

DTC U1000, U1001 CAN COMMUNICATION LINE

[QG18DE]

DTC U1000, U1001 CAN COMMUNICATION LINE

PFP:23710

Description

UBS00B3P

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

On Board Diagnosis Logic

UBS00B3Q

DTC No.

Trouble diagnosis name

DTC detecting condition

U1000*1 1000*1
U1001*2 1001*2

CAN communication line

G ECM cannot communicate to other control units.
G ECM cannot communicate for more than the specified time.

*1: This self-diagnosis has the one trip detection logic. *2: The MIL will not light up for this diagnosis.

DTC Confirmation Procedure

1. Turn ignition switch ON and wait at least 3 seconds. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. If 1st trip DTC is detected, go to EC-154, "Diagnostic Procedure" .

Possible cause G Harness or connectors
(CAN communication line is open or shorted)
UBS00B3R

Revision: December 2006

EC-152

2006 Sentra

DTC U1000, U1001 CAN COMMUNICATION LINE Wiring Diagram

[QG18DE]
UBS00B3S
A EC
C D E F G H I J K L M

Revision: December 2006

EC-153

BBWA0274E
2006 Sentra

DTC U1000, U1001 CAN COMMUNICATION LINE
Diagnostic Procedure
Go to LAN-14, "CAN COMMUNICATION"

[QG18DE]
UBS00B3T

Revision: December 2006

EC-154

2006 Sentra

DTC U1010 CAN COMMUNICATION

[QG18DE]

DTC U1010 CAN COMMUNICATION Description

PFP:23710
A
UBS00N9A

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec- EC

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.

Each control unit transmits/receives data but selectively reads required data only.

C

On Board Diagnosis Logic

UBS00N9B

This self-diagnosis has the one trip detection logic. (A/T models)

D

The MIL will not light up for this diagnosis. (M/T models)

DTC No.
U1010 1010

Trouble diagnosis name CAN communication bus

DTC detecting condition
Initializing CAN communication bus is malfunctioning.

DTC Confirmation Procedure
WITH CONSULT-II 1. Turn ignition switch ON.
2. Select "DATA MONITOR" mode with CONSULT-II.
3. If DTC is detected, go to EC-156, "Diagnostic Procedure" .

G ECM

Possible cause

E

UBS00N9C

F

G

H

I

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

J

K

L

M

Revision: December 2006

EC-155

2006 Sentra

DTC U1010 CAN COMMUNICATION
Diagnostic Procedure
1. INSPECTION START

[QG18DE]
UBS00N9D

With CONSULT-II 1. Turn ignition switch ON. 2. Select "SELF-DIAG RESULTS" mode with CONSULT-II. 3. Touch "ERASE". 4. Perform DTC Confirmation Procedure.
See EC-155, "DTC Confirmation Procedure" . 5. Is the DTC U1010 displayed again?
With GST 1. Turn ignition switch ON. 2. Select "Service $04" with GST. 3. Perform DTC Confirmation Procedure.
See EC-155, "DTC Confirmation Procedure" . 4. Is the DTC U1010 displayed again? Yes or No
Yes >> GO TO 2. No >> INSPECTION END
2. REPLACE ECM

1. Replace ECM. 2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to
BL-96, "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM -- NATS)" . 3. Perform EC-79, "VIN Registration" . 4. Perform EC-79, "Accelerator Pedal Released Position Learning" . 5. Perform EC-80, "Throttle Valve Closed Position Learning" . 6. Perform EC-80, "Idle Air Volume Learning" .

>> INSPECTION END

Revision: December 2006

EC-156

2006 Sentra

DTC P0011 IVT CONTROL

[QG18DE]

DTC P0011 IVT CONTROL
Description
SYSTEM DESCRIPTION

PFP:23796
A
UBS00B3U

Sensor Crankshaft position sensor (POS) Camshaft position sensor (PHASE) Engine coolant temperature sensor

Input Signal to ECM Engine speed Engine coolant temperature

ECM Function

Actuator

EC

Intake valve

Intake valve timing control

timing control solenoid valve

C

Vehicle speed sensor*

Vehicle speed

*: This signal is sent to the ECM through CAN communication line.

D

E

F

G

H

I

MBIB0121E

J

This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake

valve.

The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing control solenoid K

valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to

increase engine torque in low/mid speed range and output in high-speed range.

CONSULT-II Reference Value in Data Monitor Mode

L
UBS00B3V

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

M

INT/V TIM (B1)

G Engine: After warming up G Shift lever: P or N (A/T), Neutral
(M/T) G Air conditioner switch: OFF G No load

Idle 2,000 rpm

-5° - 5°CA Approx. 0° - 30°CA

INT/V SOL (B1)

G Engine: After warming up G Shift lever: P or N (A/T), Neutral
(M/T) G Air conditioner switch: OFF G No load

Idle 2,000 rpm

0% - 2% Approx. 0% - 80%

Revision: December 2006

EC-157

2006 Sentra

DTC P0011 IVT CONTROL On Board Diagnosis Logic

[QG18DE]
UBS00B3W

DTC No.
P0011 0011

Trouble diagnosis name
Intake valve timing control performance

Detecting condition
There is a gap between angle of target and phase-control angle degree.

Possible cause
G Crankshaft position sensor (POS) G Camshaft position sensor (PHASE) G Intake valve control solenoid valve G Accumulation of debris to the signal pick-up
portion of the camshaft G Timing chain installation G Foreign matter caught in the oil groove for
intake valve timing control

FAIL-SAFE MODE When the malfunction is detected, the ECM enters fail-safe mode.

Detected items

Engine operating condition in fail-safe mode

Intake valve timing control

The signal is not energized to the solenoid valve and the valve control does not function

DTC Confirmation Procedure

UBS00B3X

CAUTION: Always drive at a safe speed.
NOTE: G If DTC P0011 is displayed with DTC P0075, first perform trouble diagnosis for DTC P0075. Refer to
EC-172, "DTC P0075 IVT CONTROL SOLENOID VALVE" .
G If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is between 10V and 16V at idle.

WITH CONSULT-II 1. Turn ignition switch ON and select "DATA MONITOR" mode with
CONSULT-II.
2. Start engine and warm it up to the normal operating temperature.
3. Maintain the following conditions for at least 6 consecutive seconds. Hold the accelerator pedal as steady as possible.

ENG SPEED

1,200 - 2,000 rpm

COOLAN TEMP/S

60 - 120 °C (140 - 248 °F)

B/FUEL SCHDL

More than 3.38 msec

Selector lever

AT models: P or N position MT models: Neutral position

4. Stop vehicle with engine running and let engine idle for 10 seconds.
5. If 1st trip DTC is detected, go to EC-159, "Diagnostic Procedure" . If 1st trip DTC is not detected, go to next step.
6. Maintain the following conditions for at least 10 consecutive seconds.

PBIB0164E

ENG SPEED

1,700 - 3,175 rpm (A constant rotation is maintained.)

COOLAN TEMP/S

70 - 105 °C (176 - 194 °F)

Selector lever

1st or 2nd position

Driving location uphill

Driving vehicle uphill (Increased engine load will help maintain the driving conditions required for this test.)

7. If 1st trip DTC is detected, go to EC-159, "Diagnostic Procedure" .

Revision: December 2006

EC-158

2006 Sentra

DTC P0011 IVT CONTROL
WITH GST Follow the procedure "WITH CONSULT-II" above.
Diagnostic Procedure
1. CHECK OIL PRESSURE WARNING LAMP
1. Start engine. 2. Check oil pressure warning lamp and confirm it is not illumi-
nated. OK or NG
OK >> GO TO 2. NG >> Go to DI-27 .
2. CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE
Refer to EC-160, "Component Inspection" . OK or NG
OK >> GO TO 3. NG >> Replace intake valve timing control solenoid valve.
3. CHECK CRANKSHAFT POSITION SENSOR (POS)
Refer to EC-326, "Component Inspection" . OK or NG
OK >> GO TO 4. NG >> Replace crankshaft position sensor (POS).
4. CHECK CAMSHAFT POSITION SENSOR (PHASE)
Refer to EC-334, "Component Inspection" . OK or NG
OK >> GO TO 5. NG >> Replace camshaft position sensor (PHASE).
5. CHECK CAMSHAFT (INTAKE)
Check the following. G Accumulation of debris to the signal plate of camshaft rear end G Chipping signal plate of camshaft rear end OK or NG
OK >> GO TO 8. NG >> Remove debris and clean the signal plate of camshaft
rear end or replace camshaft.

Revision: December 2006

EC-159

[QG18DE]
A
UBS00B3Y
EC

C

D

E

PBIA8559J

F

G H

I

J

K

L

M

PBIB0565E
2006 Sentra

DTC P0011 IVT CONTROL
6. CHECK TIMING CHAIN INSTALLATION

[QG18DE]

Check service records for any recent repairs that may cause timing chain misaligned. Are there any service records that may cause timing chain misaligned?
Yes or No Yes >> Check timing chain installation. Refer to EM-48 . No >> GO TO 7.
7. CHECK LUBRICATION CIRCUIT

Refer to EM-37, "INSPECTION OF CAMSHAFT SPROCKET (INT) OIL GROOVE" . OK or NG
OK >> GO TO 8. NG >> Clean lubrication line.
8. CHECK INTERMITTENT INCIDENT

Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . For wiring diagram refer to EC-323, "Wiring Diagram" for CKP sensor (POS) and EC-330, "Wiring Diagram" for CMP sensor (PHASE).

>> INSPECTION END
Component Inspection
INTAKE VALVE TIMING CONTROL SOLENOID VALVE 1. Disconnect intake valve timing control solenoid valve harness connector.
2. Check resistance between intake valve timing control solenoid valve as follows.

Terminal 1 and 2 1 or 2 and ground

Resistance
Approximately 8 at 20°C (68°F)
 (Continuity should not exist.)

If NG, replace intake valve timing control solenoid valve. If OK, go to next step.
3. Remove intake valve timing control solenoid valve.

4. Provide 12V DC between intake valve timing control solenoid valve terminals and then interrupt it. Make sure that the plunger moves as shown in the figure.
CAUTION: Do not apply 12V DC continuously for 5 seconds or more. Doing so may result in damage to the coil in intake valve timing control solenoid valve. If NG, replace intake valve timing control solenoid valve.
NOTE: Always replace O-ring when intake valve timing control solenoid valve is removed.
Removal and Installation
INTAKE VALVE TIMING CONTROL SOLENOID VALVE
Refer to EM-42, "TIMING CHAIN" .

UBS00KJZ
PBIB0193E
PBIB2275E UBS00KK0

Revision: December 2006

EC-160

2006 Sentra

DTC P0031, P0032 A/F SENSOR 1 HEATER

[QG18DE]

DTC P0031, P0032 A/F SENSOR 1 HEATER
Description
SYSTEM DESCRIPTION

PFP:22693
A
UBS00BA2

Sensor

Input Signal to ECM

ECM function

Actuator

EC

Camshaft position sensor (PHASE) Crankshaft position sensor (POS)
Mass air flow sensor

Engine speed Amount of intake air

Air fuel ratio (A/F) sensor 1 heater control

Air fuel ratio (A/F) sensor 1 heater

C

The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to the engine operating

condition to keep the temperature of A/F sensor 1 element at the specified range.

D

CONSULT-II Reference Value in Data Monitor Mode

UBS00BA3

Specification data are reference values.

E

MONITOR ITEM

CONDITION

SPECIFICATION

A/F S1 HTR (B1)

G Engine: After warming up, idle the engine

On Board Diagnosis Logic

0 - 100%

F
UBS00BA4

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

G

P0031 0031

Air fuel ratio (A/F) sensor 1 heater control circuit low

The current amperage in the air fuel ratio (A/F) sensor 1 heater circuit is out of the normal range. (An excessively low voltage signal is sent to ECM through the air fuel ratio (A/F) sensor 1 heater.)

G Harness or connectors (The heated A/F sensor 1 heater circuit is open or shorted.)
G A/F sensor 1 heater

H

P0032 0032

Air fuel ratio (A/F) sensor 1 heater control circuit high

The current amperage in the air fuel ratio (A/F) sensor 1 heater circuit is out of the normal range. (An excessively high voltage signal is sent to ECM through the air fuel ratio (A/F) sensor 1 heater.)

G Harness or connectors (The heated A/F sensor 1 heater circuit is shorted.)
G A/F sensor 1 heater

I

DTC Confirmation Procedure

UBS00BA5

J

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

K

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at

idle.

L

WITH CONSULT-II

1. Turn ignition switch ON and select "DATA MONITOR" mode with

CONSULT-II.

M

2. Start engine and run it for at least 10 seconds at idle speed.

3. If 1st trip DTC is detected, go to EC-163, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-161

2006 Sentra

DTC P0031, P0032 A/F SENSOR 1 HEATER Wiring Diagram

[QG18DE]
UBS00BA6

Revision: December 2006

EC-162

BBWA1435E
2006 Sentra

DTC P0031, P0032 A/F SENSOR 1 HEATER

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)
C

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

[Engine is running] G Warm-up condition G Idle speed

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

D

E

PBIB1584E

Approximately 3.1V

Approximately 2.6V

F

2 - 3V

2 - 3V

G

UBS00BA7

H

1. Turn ignition switch OFF.

2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

I

J

K

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

L
BBIA0515E
M

Revision: December 2006

EC-163

2006 Sentra

DTC P0031, P0032 A/F SENSOR 1 HEATER
2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect air fuel ratio (A/F) sensor 1 harness connector. 2. Turn ignition switch ON.

[QG18DE]

3. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 4. NG >> GO TO 3.

BBIA0140E

3. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M19, E108 G Harness connectors E10, F48 G Fuse block (J/B) connector M1 G 15A fuse G Harness for open or short between A/F sensor 1 and fuse

PBIB1683E

>> Repair or replace harness or connectors.
4. CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 2 and A/F sensor 1 terminal 4. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK A/F SENSOR 1 HEATER
Refer to EC-165, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> GO TO 7.

Revision: December 2006

EC-164

2006 Sentra

DTC P0031, P0032 A/F SENSOR 1 HEATER
6. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . OK or NG
OK >> GO TO 7. NG >> Repair or replace.
7. REPLACE AIR FUEL RATIO (A/F) SENOSOR 1

[QG18DE]
A EC
C

Replace air fuel ratio (A/F) sensor 1.

CAUTION: G Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a

D

hard surface such as a concrete floor; use a new one.

G Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread

Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

E

>> INSPECTION END
Component Inspection
AIR FUEL RATIO (A/F) SENSOR 1 HEATER Check resistance between terminals 3 and 4.
Resistance: 2.3 - 4.3 at 25°C (77°F)
Check continuity between terminals 3 and 1, 2, 5, 6, terminals 4 and 1, 2, 5, 6.
Continuity should not exist.
If NG, replace the A/F sensor 1. CAUTION: G Discard any A/F sensor which has been dropped from a
height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one. G Before installing new A/F sensor, clean exhaust system threads using Heated Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

F
UBS00BA8
G H
I J
K

L

Removal and Installation
AIR FUEL RATIO SENSOR HEATER
Refer to EM-15, "Removal and Installation" .

M
PBIB1684E UBS00BA9

Revision: December 2006

EC-165

2006 Sentra

DTC P0037, P0038 HO2S2 HEATER

[QG18DE]

DTC P0037, P0038 HO2S2 HEATER

PFP:226A0

Description
SYSTEM DESCRIPTION

UBS00B3Z

Sensor

Input Signal to ECM

ECM Function

Actuator

Camshaft position sensor (PHASE) Crankshaft position sensor (POS) Engine coolant temperature sensor

Engine speed Engine coolant temperature

Heated oxygen sensor 2 heater control

Heated oxygen sensor 2 heater

Mass air flow sensor

Amount of intake air

The ECM performs ON/OFF control of the heated oxygen sensor 2 heater corresponding to the engine speed, amount of intake air and engine coolant temperature.

OPERATION

Engine speed rpm

Heated oxygen sensor 2 heater

Above 3,600
Below 3,600 rpm after the following conditions are met. G Engine: After warming up G Keeping the engine speed between 3,500 and 4,000 rpm for 1
minute and at idle for 1 minute under no load

OFF ON

CONSULT-II Reference Value in Data Monitor Mode

UBS00B40

Specification data are reference values.

MONITOR ITEM HO2S2 HTR (B1)

CONDITION
G Engine speed: Below 3,600 rpm after the following conditions are met. ­ Engine: After warming up ­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute
and at idle for 1 minute under no load.

SPECIFICATION ON

G Engine speed: Above 3,600 rpm

OFF

On Board Diagnosis Logic

UBS00B41

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0037 0037

Heated oxygen sensor 2 heater control circuit low

The current amperage in the heated oxygen sensor 2 heater circuit is out of the normal range. (An excessively low voltage signal is sent to ECM through the heated oxygen sensor 2 heater.)

G Harness or connectors (The heated oxygen sensor 2 heater circuit is open or shorted.)
G Heater oxygen sensor 2 heater

P0038 0038

Heated oxygen sensor 2 heater control circuit high

The current amperage in the heated oxygen sensor 2 heater circuit is out of the normal range. (An excessively high voltage signal is sent to ECM through the heated oxygen sensor 2 heater.)

G Harness or connectors (The heated oxygen sensor 2 heater circuit is shorted.)
G Heater oxygen sensor 2 heater

Revision: December 2006

EC-166

2006 Sentra

DTC P0037, P0038 HO2S2 HEATER

[QG18DE]

DTC Confirmation Procedure

UBS00B42

NOTE:

A

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

EC

Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at

idle.

WITH CONSULT-II

C

1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.

2. Start engine and warm it up to the normal operating temperature.

3. Turn ignition switch OFF and wait at least 10 seconds.

D

4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. E
5. Let engine idle for 1 minute.

6. If 1st trip DTC is detected, go to EC-169, "Diagnostic Procedure" . F

WITH GST Follow the procedure "WITH CONSULT-II" above.

G
SEF174Y
H
I

J

K

L

M

Revision: December 2006

EC-167

2006 Sentra

Wiring Diagram

DTC P0037, P0038 HO2S2 HEATER

[QG18DE]
UBS00B43

Revision: December 2006

EC-168

BBWA1423E
2006 Sentra

DTC P0037, P0038 HO2S2 HEATER

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

[Engine is running]

C

G Engine speed: Below 3,600 rpm after the

following conditions are met.

­ Engine: After warming up

0 - 1.0V

D

­ Keeping the engine speed between 3,500

25 W/B

Heated oxygen sensor 2 heater

and 4,000 rpm for 1 minute and at idle for 1 minute under on load

E
[Ignition switch: ON]

G Engine stopped.

BATTERY VOLTAGE

[Engine is running]

(11 - 14V)

F

G Engine speed: Above 3,600 rpm.

[Engine is running]

G Revving engine from idle up to 3,000 rpm

G

quickly after the following conditions are

met.

74 R/L

Heated oxygen sensor 2

0 - Approximately 1.0V

­ Engine: After warming up

­ Keeping the engine speed between 3,500

H

and 4,000 rpm for 1 minute and at idle for 1

minute under no load.

78 B

Sensor ground (Heated oxygen sensor)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

I
J
UBS00B44

K 1. Turn ignition switch OFF.

2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

L

M

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

BBIA0515E

Revision: December 2006

EC-169

2006 Sentra

DTC P0037, P0038 HO2S2 HEATER
2. CHECK HO2S2 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor 2 harness connector. 2. Turn ignition switch ON.

[QG18DE]

3. Check voltage between HO2S2 terminal 3 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 4. NG >> GO TO 3.

BBIA0175E

3. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E10, F48 G Harness connectors E108, M19 G Fuse block (J/B) connector M1 G 15A fuse G Harness for open or short between heated oxygen sensor 2 and fuse

PBIB2633E

>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 25 and HO2S2 terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK HEATED OXYGEN SENSOR 2 HEATER
Refer to EC-171, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> Replace heated oxygen sensor 2.

Revision: December 2006

EC-170

2006 Sentra

DTC P0037, P0038 HO2S2 HEATER

6. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
HEATED OXYGEN SENSOR 2 HEATER 1. Check resistance between HO2S2 terminals as follows.

Terminal No.

Resistance

2 and 3

8 -10  at 25°C (77°F)

1 and 2, 3, 4 4 and 1, 2, 3

  (Continuity should not exist)

2. If NG, replace heated oxygen sensor 2.
CAUTION: G Discard any heated oxygen sensor which has been dropped
from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
G Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-4389718 or J-43897-12 and approved anti-seize lubricant.

Removal and Installation
HEATED OXYGEN SENSOR 2
Refer to EX-3, "EXHAUST SYSTEM" .

[QG18DE]
A
EC
UBS00B45
C
D
E
F
G
H
I
PBIB3083E
J
UBS00B46
K
L
M

Revision: December 2006

EC-171

2006 Sentra

DTC P0075 IVT CONTROL SOLENOID VALVE
DTC P0075 IVT CONTROL SOLENOID VALVE
Description
COMPONENT DESCRIPTION Intake valve timing control solenoid valve is activated by ON/OFF pulse duty (ratio) signals from the ECM. The intake valve timing control solenoid valve changes the oil amount and direction of flow through intake valve timing control unit or stops oil flow. The longer pulse width advances valve angle. The shorter pulse width retards valve angle. When ON and OFF pulse widths become equal, the solenoid valve stops oil pressure flow to fix the intake valve angle at the control position.

[QG18DE]
PFP:23796
UBS00BAM

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

CONDITION

INT/V SOL (B1)

G Engine: After warming up G Shift lever: P or N (A/T), Neutral (M/T) G Air conditioner switch: OFF G No load

Idle 2,000 rpm

On Board Diagnosis Logic

PBIB1842E UBS00BAN
SPECIFICATION 0% - 2% Approx. 0% - 80%
UBS00BAO

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0075 0075

Intake valve timing control solenoid valve circuit

An improper voltage is sent to the ECM through intake valve timing control solenoid valve.

G Harness or connectors (Solenoid valve circuit is open or shorted.)
G Intake valve timing control solenoid valve

DTC Confirmation Procedure

UBS00BAP

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for 5 seconds. 4. If 1st trip DTC is detected, go to EC-175, "Diagnostic Procedure"
.

WITH GST Following the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-172

2006 Sentra

DTC P0075 IVT CONTROL SOLENOID VALVE Wiring Diagram

[QG18DE]
UBS00BAQ
A EC
C D E F G H I J K L M

Revision: December 2006

EC-173

BBWA1436E
2006 Sentra

DTC P0075 IVT CONTROL SOLENOID VALVE

[QG18DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION
[Engine is running] G Warm-up condition G Idle speed

DATA (DC Voltage)
BATTERY VOLTAGE (11 - 14V)

11 G/Y

Intake valve timing control solenoid valve

[Engine is running] G Warm-up condition G Engine speed: 2,000 rpm

7 - 10V

111 W/G
119 R/G 120 R/G

ECM relay (Self shut-off) Power supply for ECM

PBIB1790E

[Engine is running] [Ignition switch: OFF]
G For a few seconds after turning ignition switch OFF

0 - 1.0V

[Ignition switch: OFF]
G More than a few seconds after turning ignition switch OFF

BATTERY VOLTAGE (11 - 14V)

[Ignition switch: ON]

BATTERY VOLTAGE (11 - 14V)

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Revision: December 2006

EC-174

2006 Sentra

DTC P0075 IVT CONTROL SOLENOID VALVE
Diagnostic Procedure
1. CHECK IVT CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect intake valve timing (IVT) control solenoid valve har-
ness connector. 3. Turn ignition switch ON.

[QG18DE]
UBS00BAR
A
EC
C

D

4. Check voltage between intake valve timing control solenoid valve terminal 2 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 3. NG >> GO TO 2.

E
BBIA0148E
F G H

2. DETECT MALFUNCTIONING PART

PBIB0192E
I

Check harness for open or short between intake valve timing control solenoid valve and ECM relay.

J

>> Repair or replace harness or connectors.

3. CHECK IVT CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

K

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

L

3. Check harness continuity between ECM terminal 11 and intake valve timing control solenoid valve terminal 1. Refer to Wiring Diagram. M Continuity should exist.

4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

4. CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE

Refer to EC-176, "Component Inspection" .
OK or NG OK >> GO TO 5. NG >> Replace intake valve timing control solenoid valve.

Revision: December 2006

EC-175

2006 Sentra

DTC P0075 IVT CONTROL SOLENOID VALVE

5. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
INTAKE VALVE TIMING CONTROL SOLENOID VALVE 1. Disconnect intake valve timing control solenoid valve harness connector.
2. Check resistance between intake valve timing control solenoid valve as follows.

Terminal 1 and 2 1 or 2 and ground

Resistance
Approximately 8 at 20°C (68°F)
 (Continuity should not exist.)

If NG, replace intake valve timing control solenoid valve. If OK, go to next step.
3. Remove intake valve timing control solenoid valve.

4. Provide 12V DC between intake valve timing control solenoid valve terminals and then interrupt it. Make sure that the plunger moves as shown in the figure.
CAUTION: Do not apply 12V DC continuously for 5 seconds or more. Doing so may result in damage to the coil in intake valve timing control solenoid valve. If NG, replace intake valve timing control solenoid valve.
NOTE: Always replace O-ring when intake valve timing control solenoid valve is removed.
Removal and Installation
INTAKE VALVE TIMING CONTROL SOLENOID VALVE
Refer to EM-42, "TIMING CHAIN" .

[QG18DE]
UBS00BAS
PBIB0193E
PBIB2275E UBS00BAT

Revision: December 2006

EC-176

2006 Sentra

DTC P0101 MAF SENSOR
DTC P0101 MAF SENSOR
Component Description
The mass air flow sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. The mass air flow sensor controls the temperature of the hot wire to a certain amount. The heat generated by the hot wire is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the electric current supplied to hot wire is changed to maintain the temperature of the hot wire as air flow increases. The ECM detects the air flow by means of this current change.

[QG18DE]
PFP:22680
A
UBS00B47
EC
C
D

CONSULT-II Reference Value in Data Monitor Mode

PBIB1604E
E
UBS00B48

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

F

MAS A/F SE-B1

See EC-134, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .

CAL/LD VALUE MASS AIRFLOW

G Engine: After warming up G Air conditioner switch: OFF G Shift lever: P or N (A/T), Neutral (M/T) G No load

Idle 2,500 rpm

G Engine: After warming up G Air conditioner switch: OFF G Shift lever: P or N (A/T), Neutral (M/T) G No load

Idle 2,500 rpm

20.0 - 35.5%
G
12.0 - 30.0%
H
1.4 - 4.0 g·m/s

5.0 - 10.0 g·m/s

I

On Board Diagnosis Logic
DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

UBS00B49
J

G Harness or connectors

(The sensor circuit is open or

K

shorted.)

A)

A high voltage from the sensor is sent to ECM G Mass air flow sensor under light load driving condition.

G EVAP control system pressure

L

sensor

P0101 0101

Mass air flow sensor circuit range/performance

G Intake air temperature sensor

G Harness or connectors

M

(The sensor circuit is open or

shorted.)

B)

A low voltage from the sensor is sent to ECM under heavy load driving condition.

G Intake air leaks G Mass air flow sensor

G EVAP control system pressure sensor

G Intake air temperature sensor

Revision: December 2006

EC-177

2006 Sentra

DTC P0101 MAF SENSOR

[QG18DE]

DTC Confirmation Procedure

UBS00B4A

Perform PROCEDURE FOR MALFUNCTION A first. If the 1st trip DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.

PROCEDURE FOR MALFUNCTION A
NOTE: If engine will not start or stops soon, wait at least 10 seconds with engine stopped (Ignition switch ON) instead of running engine at idle speed.

With CONSULT-II

1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and warm it up to normal operating temperature. 4. Run engine for at least 10 seconds at idle speed. 5. If 1st trip DTC is detected, go to EC-181, "Diagnostic Procedure"
.

With GST
Follow the procedure "With CONSULT-II" above.
PROCEDURE FOR MALFUNCTION B CAUTION: Always driver vehicle at a safe speed.
With CONSULT-II
1. Turn ignition switch ON. 2. Start engine and warm it up to normal operating temperature.
If engine cannot be started, go to EC-181, "Diagnostic Procedure" . 3. Select "DATA MONITOR" mode with CONSULT-II. 4. Check the voltage of "MAS A/F SE-B1" with "DATA MONITOR". 5. Increases engine speed to about 4,000 rpm. 6. Monitor the linear voltage rise in response to engine speed
increases. If NG, go to EC-181, "Diagnostic Procedure" . If OK, go to following step.

SEF174Y

Revision: December 2006

EC-178

SEF243Y
2006 Sentra

DTC P0101 MAF SENSOR

[QG18DE]

7. Maintain the following conditions for at least 10 consecutive sec-

onds.

A

ENG SPEED

More than 2,000 rpm

THRTL SEN 1

More than 3.0V

EC

THRTL SEN 2

More than 3.0V

Selector lever

Suitable position

Driving location

Driving vehicle uphill (Increased engine load) will help maintain the driving conditions required for this test.

8. If 1st trip DTC is detected, go to EC-181, "Diagnostic Procedure" .

C
PBIB0199E
D

Overall Function Check

UBS00B4B

E

Use this procedure to check the overall function of the mass air flow sensor circuit. During this check, a DTC

might not be confirmed.

PROCEDURE FOR MALFUNCTION B

F

With GST

1. Turn ignition switch ON.

2. Start engine and warm it up to normal operating temperature.

G

3. Select "Service $01" with GST.

4. Check the mass air flow sensor signal with "Service $01".

H

5. Check for linear mass air flow rise in response to increases to

about 4,000 rpm in engine speed.

6. If NG, go to EC-181, "Diagnostic Procedure" .

I

SEF534P

J

K

L

M

Revision: December 2006

EC-179

2006 Sentra

Wiring Diagram

DTC P0101 MAF SENSOR

[QG18DE]
UBS00B4C

Revision: December 2006

EC-180

BBWA1424E
2006 Sentra

DTC P0101 MAF SENSOR

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

[Engine is running]

C

G Warm-up condition

0.9 - 1.2V

G Idle speed

51 L/R

Mass air flow sensor

[Engine is running]

D

G Warm-up condition

1.4 - 1.8V

G Engine speed: 2,500 rpm.

[Engine is running]

E

67 B/W

Sensor ground

G Warm-up condition

Approximately 0V

G Idle speed
F
[Engine is running]

[Ignition switch: OFF] G For a few seconds after turning ignition

0 - 1.0V

111 W/G

ECM relay (Self shut-off)

switch OFF

G

[Ignition switch: OFF]

BATTERY VOLTAGE

G More than a few seconds passed after turn- (11 - 14V) ing ignition switch OFF

H

119 R/G 120 R/G

Power supply for ECM

Diagnostic Procedure
1. INSPECTION START

[Ignition switch: ON]

Which malfunction (A or B) is duplicated?

A or B

A

>> GO TO 3.

B

>> GO TO 2.

BATTERY VOLTAGE (11 - 14V)

I
UBS00B4D

J

K

2. CHECK INTAKE AIR LEAK L Check the following for connections.

G Air duct

G Vacuum hoses

M

G Intake air passage between air duct and collector

OK or NG

OK >> GO TO 3. NG >> Reconnect the parts.

Revision: December 2006

EC-181

2006 Sentra

DTC P0101 MAF SENSOR
3. RETIGHTEN GROUND SCREWS

[QG18DE]

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

OK or NG OK >> GO TO 4. NG >> Repair or replace ground connections.
4. CHECK MAF SENSOR POWER SUPPLY CIRCUIT
1. Disconnect mass air flow (MAF) sensor harness connector. 2. Turn ignition switch ON.

BBIA0515E

3. Check voltage between MAF sensor terminals 2 and ground with CONSULT-II or tester.

Voltage

: Battery voltage.

OK or NG
OK >> GO TO 6. NG >> GO TO 5.

BBIA0516E

5. DETECT MALFUNCTIONING PART
Check the following. G Harness for open or short between ECM relay and mass air flow sensor G Harness for open or short between mass air flow sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB2580E

Revision: December 2006

EC-182

2006 Sentra

DTC P0101 MAF SENSOR

[QG18DE]

6. CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT A

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Disconnect TCM harness connector.

EC

4. Check harness continuity between MAF sensor terminal 3 and ECM terminal 67, TCM terminal 42.
Refer to Wiring Diagram. C
Continuity should exist.

5. Also check harness for short to ground and short to power.

OK or NG

D

OK >> GO TO 8. NG >> GO TO 7.

7. DETECT MALFUNCTIONING PART

E

Check the following.

G Harness for open or short between mass air flow sensor and ECM

F

G Harness for open or short between mass air flow sensor and TCM

G >> Repair open circuit or short to ground or short to power in harness or connectors.

8. CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

H

1. Check harness continuity between MAF sensor terminal 4 and ECM terminal 51.

Refer to Wiring Diagram.

Continuity should exist.

I

2. Also check harness for short to ground and short to power.

OK or NG

J

OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

9. CHECK INTAKE AIR TEMPERATURE SENSOR

K

Refer to EC-197, "Component Inspection" .

OK or NG

L

OK >> GO TO 10. NG >> Replace intake air temperature sensor.
M
10. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to EC-386, "Component Inspection" . OK or NG
OK >> GO TO 11. NG >> Replace EVAP control system pressure sensor.
11. CHECK MASS AIR FLOW SENSOR

Refer to EC-184, "Component Inspection" .
OK or NG OK >> GO TO 12. NG >> Replace mass air flow sensor.

Revision: December 2006

EC-183

2006 Sentra

DTC P0101 MAF SENSOR

12. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
MASS AIR FLOW SENSOR With CONSULT-II
1. Reconnect all harness connectors disconnected. 2. Start engine and warm it up to normal operating temperature. 3. Connect CONSULT-II and select "DATA MONITOR" mode. 4. Select "MAS A/F SE-B1" and check indication under the follow-
ing conditions.

Condition

MAS A/F SE-B1 (V)

Ignition switch ON (Engine stopped.)

Approx 0.4

Idle (Engine is warmed-up to normal operating temperature.)

0.9 - 1.2

2,500 rpm (Engine is warmed-up to normal operating temperature.)

1.4 - 1.8

Idle to about 4,000 rpm

0.9 - 1.2 to 2.4*

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
5. If the voltage is out of specification, proceed the following. a. Check for the cause of uneven air flow through mass air flow sensor. Refer to following.
G Crushed air ducts G Malfunctioning seal of air cleaner element G Uneven dirt of air cleaner element G Improper specification of intake air system parts b. If NG, repair or replace malfunctioning part and perform step 2 to 4 again. If OK, go to next step. 6. Turn ignition switch OFF. 7. Disconnect mass air flow sensor harness connector and reconnect it again. 8. Perform step 2 to 4 again. 9. If NG, clean or replace mass air flow sensor.

Without CONSULT-II 1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature. 3. Check voltage between ECM terminal 51 (Mass air flow sensor
signal) and ground.

Condition

Voltage V

Ignition switch ON (Engine stopped.)

Approx 0.4

Idle (Engine is warmed-up to normal operating temperature.)

0.9 - 1.2

2,500 rpm (Engine is warmed-up to normal operating temperature.)

1.4 - 1.8

Idle to about 4,000 rpm

0.9 - 1.2 to 2.4*

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
4. If the voltage is out of specification, proceed the following.

Revision: December 2006

EC-184

[QG18DE]
UBS00B4E PBIB2371E
PBIB1106E
2006 Sentra

DTC P0101 MAF SENSOR
a. Check for the cause of uneven air flow through mass air flow sensor. Refer to following. G Crushed air ducts G Malfunctioning seal of air cleaner element G Uneven dirt of air cleaner element G Improper specification of intake air system parts
b. If NG, repair or replace malfunctioning part and perform step 2 to 3 again. If OK, go to next step.
5. Turn ignition switch OFF. 6. Disconnect mass air flow sensor harness connector and reconnect it again. 7. Perform step 2 and 3 again. 8. If NG, clean or replace mass air flow sensor.

[QG18DE]
A EC
C D E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-185

2006 Sentra

DTC P0102, P0103 MAF SENSOR
DTC P0102, P0103 MAF SENSOR
Component Description
The mass air flow sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. The mass air flow sensor controls the temperature of the hot wire to a certain amount. The heat generated by the hot wire is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the electric current supplied to hot wire is changed to maintain the temperature of the hot wire as air flow increases. The ECM detects the air flow by means of this current change.

[QG18DE]
PFP:22680
UBS00B4F

CONSULT-II Reference Value in Data Monitor Mode

PBIB1604E UBS00B4G

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

MAS A/F SE-B1

See EC-134, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .

CAL/LD VALUE

G Engine: After warming up G Air conditioner switch: OFF G Shift lever: P or N (A/T), Neutral (M/T) G No load

Idle 2,500 rpm

20.0 - 35.5% 12.0 - 30.0%

MASS AIRFLOW

G Engine: After warming up G Air conditioner switch: OFF G Shift lever: P or N (A/T), Neutral (M/T) G No load

Idle 2,500 rpm

1.4 - 4.0 g·m/s 5.0 - 10.0 g·m/s

On Board Diagnosis Logic

UBS00B4H

These self-diagnoses have the one trip detection logic.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0102 0102
P0103 0103

Mass air flow sensor An excessively low voltage from the sensor is

circuit low input

sent to ECM.

Mass air flow sensor An excessively high voltage from the sensor is

circuit high input

sent to ECM.

G Harness or connectors (The sensor circuit is open or shorted.)
G Intake air leaks G Mass air flow sensor
G Harness or connectors (The sensor circuit is open or shorted.)
G Mass air flow sensor

FAIL-SAFE MODE When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

Detected items

Engine operating condition in fail-safe mode

Mass air flow sensor circuit

Engine speed will not rise more than 2,400 rpm due to the fuel cut.

Revision: December 2006

EC-186

2006 Sentra

DTC P0102, P0103 MAF SENSOR

[QG18DE]

DTC Confirmation Procedure

UBS00B4I

NOTE:

A

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

EC
PROCEDURE FOR DTC P0102

With CONSULT-II

1. Turn ignition switch ON.

C

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Start engine and wait at least 5 seconds.

4. If DTC is detected, go to EC-189, "Diagnostic Procedure" .

D

E

With GST Follow the procedure "With CONSULT-II" above. PROCEDURE FOR DTC P0103
With CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Wait at least 5 seconds. 4. If DTC is detected, go to EC-189, "Diagnostic Procedure" .
If DTC is not detected, go to next step. 5. Start engine and wait at least 5 seconds. 6. If DTC is detected, go to EC-189, "Diagnostic Procedure" .
With GST Follow the procedure "With CONSULT-II" above.

SEF058Y

F

G

H

I

J

K
SEF058Y
L

M

Revision: December 2006

EC-187

2006 Sentra

Wiring Diagram

DTC P0102, P0103 MAF SENSOR

[QG18DE]
UBS00B4J

Revision: December 2006

EC-188

BBWA1424E
2006 Sentra

DTC P0102, P0103 MAF SENSOR

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

[Engine is running]

C

G Warm-up condition

0.9 - 1.2V

G Idle speed

51 L/R

Mass air flow sensor

[Engine is running]

D

G Warm-up condition

1.4 - 1.8V

G Engine speed: 2,500 rpm.

[Engine is running]

E

67 B/W

Sensor ground

G Warm-up condition

Approximately 0V

G Idle speed
F
[Engine is running]

[Ignition switch: OFF] G For a few seconds after turning ignition

0 - 1.0V

111 W/G

ECM relay (Self shut-off)

switch OFF

G

[Ignition switch: OFF]

BATTERY VOLTAGE

G More than a few seconds passed after turn- (11 - 14V) ing ignition switch OFF

H

119 R/G 120 R/G

Power supply for ECM

Diagnostic Procedure
1. INSPECTION START

[Ignition switch: ON]

Which malfunction (P0102 or P0103) is duplicated? P0102 or P0103
P0102 >> GO TO 2. P0103 >> GO TO 3.

BATTERY VOLTAGE (11 - 14V)

I
UBS00B4K

J

K

2. CHECK INTAKE SYSTEM L Check the following for connections.

G Air duct

G Vacuum hoses

M

G Intake air passage between air duct to manifold

OK or NG

OK >> GO TO 3. NG >> Reconnect the parts.

Revision: December 2006

EC-189

2006 Sentra

DTC P0102, P0103 MAF SENSOR
3. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151 .

[QG18DE]

OK or NG OK >> GO TO 4. NG >> Repair or replace ground connections.
4. CHECK MAF SENSOR POWER SUPPLY CIRCUIT
1. Disconnect mass air flow (MAF) sensor harness connector. 2. Turn ignition switch ON.

BBIA0515E

3. Check voltage between MAF terminals 2 and ground with CONSULT-II or tester.

Voltage

: Battery voltage.

OK or NG
OK >> GO TO 6. NG >> GO TO 5.

5. DETECT MALFUNCTIONING PART
Check the following. G Harness for open or short between ECM relay and mass air flow sensor G Harness for open or short between mass air flow sensor and ECM
>> Repair harness or connectors.

Revision: December 2006

EC-190

BBIA0516E PBIB2580E
2006 Sentra

DTC P0102, P0103 MAF SENSOR

[QG18DE]

6. CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT A

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Disconnect TCM harness connector.

EC

4. Check harness continuity between MAF sensor terminal 3 and ECM terminal 67, TCM terminal 42.
Refer to Wiring Diagram. C
Continuity should exist.

5. Also check harness for short to ground and short to power.

OK or NG

D

OK >> GO TO 8. NG >> GO TO 7.

7. DETECT MALFUNCTIONING PART

E

Check the following.

G Harness for open or short between mass air flow sensor and ECM

F

G Harness for open or short between mass air flow sensor and TCM

G >> Repair open circuit or short to ground or short to power in harness or connectors.

8. CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR POEN AND SHORT

H

1. Check harness continuity between MAF sensor terminal 4 and ECM terminal 51.

Refer to Wiring Diagram.

Continuity should exist.

I

2. Also check harness for short to ground and short to power.

OK or NG

J

OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

9. CHECK MASS AIR FLOW SENSOR

K

Refer to EC-192, "Component Inspection" .

OK or NG

L

OK >> GO TO 10. NG >> Replace mass air flow sensor.
M
10. CHECK INTERMITTENT INCIDENT

Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-191

2006 Sentra

DTC P0102, P0103 MAF SENSOR

Component Inspection
MASS AIR FLOW SENSOR With CONSULT-II
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Connect CONSULT-II and select "DATA MONITOR" mode.
4. Select "MAS A/F SE-B1" and check indication under the following conditions.

Condition

MAS A/F SE-B1 (V)

Ignition switch ON (Engine stopped.)

Approx 0.4

Idle (Engine is warmed-up to normal operating temperature.)

0.9 - 1.2

2,500 rpm (Engine is warmed-up to normal operating temperature.)

1.4 - 1.8

Idle to about 4,000 rpm

0.9 - 1.2 to 2.4*

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
5. If the voltage is out of specification, proceed the following. a. Check for the cause of uneven air flow through mass air flow sensor. Refer to following.
G Crushed air ducts G Malfunctioning seal of air cleaner element G Uneven dirt of air cleaner element G Improper specification of intake air system parts b. If NG, repair or replace malfunctioning part and perform step 2 to 4 again. If OK, go to next step. 6. Turn ignition switch OFF. 7. Disconnect mass air flow sensor harness connector and reconnect it again. 8. Perform step 2 to 4 again. 9. If NG, clean or replace mass air flow sensor.

Without CONSULT-II 1. Reconnect all harness connectors disconnected. 2. Start engine and warm it up to normal operating temperature.
3. Check voltage between ECM terminal 51 (Mass air flow sensor signal) and ground.

Condition

Voltage V

Ignition switch ON (Engine stopped.)

Approx 0.4

Idle (Engine is warmed-up to normal operating temperature.)

0.9 - 1.2

2,500 rpm (Engine is warmed-up to normal operating temperature.)

1.4 - 1.8

Idle to about 4,000 rpm

0.9 - 1.2 to 2.4*

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.

4. If the voltage is out of specification, proceed the following.

a. Check for the cause of uneven air flow through mass air flow sensor. Refer to following. G Crushed air ducts G Malfunctioning seal of air cleaner element G Uneven dirt of air cleaner element G Improper specification of intake air system parts

Revision: December 2006

EC-192

[QG18DE]
UBS00B4L PBIB2371E
PBIB1106E
2006 Sentra

DTC P0102, P0103 MAF SENSOR
b. If NG, repair or replace malfunctioning part and perform step 2 to 3 again. If OK, go to next step.
5. Turn ignition switch OFF. 6. Disconnect mass air flow sensor harness connector and reconnect it again. 7. Perform step 2 and 3 again. 8. If NG, clean or replace mass air flow sensor.

[QG18DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-193

2006 Sentra

DTC P0112, P0113 IAT SENSOR
DTC P0112, P0113 IAT SENSOR Component Description
The intake air temperature sensor is built-into mass air flow sensor. The sensor detects intake air temperature and transmits a signal to the ECM. The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rise.

[QG18DE]
PFP:22630
UBS00B4M

PBIB1604E

<Reference data>

Intake air temperature °C (°F)

Voltage* V

Resistance k

25 (77)

3.3

1.800 - 2.200

80 (176)

1.2

0.283 - 0.359

*: These data are reference values and are measured between ECM terminal 34 (Intake air temperature sensor) and ground.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis Logic

SEF012P UBS00B4N

DTC No.
P0112 0112
P0113 0113

Trouble diagnosis name

DTC detecting condition

Intake air temperature An excessively low voltage from the sensor is sensor circuit low input sent to ECM.

Intake air temperature An excessively high voltage from the sensor sensor circuit high input is sent to ECM.

Possible cause
G Harness or connectors (The sensor circuit is open or shorted.)
G Intake air temperature sensor

DTC Confirmation Procedure

UBS00B4O

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II
1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Wait at least 5 seconds. 4. If 1st trip DTC is detected, go to EC-196, "Diagnostic Procedure"
.

WITH GST Follow the procedure "WITH CONSULT-II" above.

Revision: December 2006

EC-194

SEF058Y
2006 Sentra

Wiring Diagram

DTC P0112, P0113 IAT SENSOR

[QG18DE]
UBS00B4P
A EC
C D E F G H I J K L M

Revision: December 2006

EC-195

BBWA1425E
2006 Sentra

DTC P0112, P0113 IAT SENSOR
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

[QG18DE]
UBS00B4Q

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY
1. Disconnect mass air flow sensor (intake air temperature sensor is built-into) sensor harness connector.
2. Turn ignition switch ON.
3. Check voltage between mass air flow sensor terminal 5 and ground with CONSULT-II or tester. Voltage: Approximately 5V
OK or NG OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

BBIA0515E BBIA0150E PBIB2581E

Revision: December 2006

EC-196

2006 Sentra

DTC P0112, P0113 IAT SENSOR

[QG18DE]

3. CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT A

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Disconnect TCM harness connector.

EC

4. Check harness continuity between mass air flow sensor terminal 6 and ECM terminal 67, TCM terminal

42.

Refer to wiring diagram.

C

Continuity should exist.

5. Also check harness for short to ground and short to power.

D

OK or NG

OK >> GO TO 5.

NG >> GO TO 4.

E

4. DETECT MALFUNCTIONING PART

Check the following.

F

G Harness for open or short between TCM and intake air temperature sensor

G Harness for open or short between ECM and intake air temperature sensor G

>> Repair open circuit or short to ground or short to power in harness or connectors.

5. CHECK INTAKE AIR TEMPERATURE SENSOR

H

Refer to EC-197, "Component Inspection" .

OK or NG

I

OK >> GO TO 6.

NG >> Replace mass air flow sensor with intake air temperature sensor.

6. CHECK INTERMITTENT INCIDENT

J

Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . K

>> INSPECTION END
Component Inspection
INTAKE AIR TEMPERATURE SENSOR 1. Check resistance between intake air temperature sensor termi-
nals 5 and 6 under the following conditions.

Intake air temperature °C (°F)

Resistance k

25 (77)

1.800 - 2.200

2. If NG, replace mass air flow sensor (with intake air temperature sensor).

UBS00B4R

L

M

PBIB1604E

Revision: December 2006

EC-197

2006 Sentra

DTC P0112, P0113 IAT SENSOR

[QG18DE]

SEF012P

Revision: December 2006

EC-198

2006 Sentra

DTC P0117, P0118 ECT SENSOR
DTC P0117, P0118 ECT SENSOR Component Description
The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

[QG18DE]
PFP:22630
A
UBS00B4S
EC
C

D

<Reference data>

SEF594K
E

Engine coolant temperature °C (°F)

Voltage* V

Resistance k

F

-10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.1 - 2.9

G

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

*: These data are reference values and are measured between ECM terminal 73 (Engine coolant temperature sensor) and ground.

H
SEF012P

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may damage the

I

ECM's transistor. Use ground other than ECM, such as body ground.

On Board Diagnosis Logic
These self-diagnoses have the one trip detection logic.

UBS00B4T

J

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

K

P0117 0117

Engine coolant temperature sensor circuit low input

An excessively low voltage from the sensor is sent to ECM.

G Harness or connectors

L

Engine coolant

(The sensor circuit is open or shorted.)

P0118

temperature sen- An excessively high voltage from the sensor is G Engine coolant temperature sensor

0118

sor circuit high input

sent to ECM.

M

Revision: December 2006

EC-199

2006 Sentra

DTC P0117, P0118 ECT SENSOR

[QG18DE]

FAIL-SAFE MODE When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

Detected items

Engine operating condition in fail-safe mode

Engine coolant temperature will be determined by ECM based on the time after turning ignition switch ON or START. CONSULT-II displays the engine coolant temperature decided by ECM.

Condition

Engine coolant temperature decided (CONSULT-II display)

Engine coolant temperature sensor circuit

Just as ignition switch is turned ON or START
More than approx. 4 minutes after ignition ON or START

40°C (104°F) 80°C (176°F)

Except as shown above

40 - 80°C (104 - 176°F) (Depends on the time)

When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates while the engine is running.

DTC Confirmation Procedure

UBS00B4U

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Wait at least 5 seconds. 4. If DTC is detected, go to EC-202, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-200

2006 Sentra

Wiring Diagram

DTC P0117, P0118 ECT SENSOR

[QG18DE]
UBS00B4V
A EC
C D E F G H I J K L M

Revision: December 2006

EC-201

BBWA1426E
2006 Sentra

DTC P0117, P0118 ECT SENSOR
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

[QG18DE]
UBS00B4W

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. CHECK ECT SENSOR POWER SUPPLY CIRCUIT
1. Disconnect engine coolant temperature (ECT) sensor harness connector.
2. Turn ignition switch ON.
3. Check voltage between ECT terminal 1 and ground with CONSULT-II or tester. Voltage: Approximately 5V
OK or NG OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

BBIA0515E BBIA0151E PBIB0080E

Revision: December 2006

EC-202

2006 Sentra

DTC P0117, P0118 ECT SENSOR

[QG18DE]

3. CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORRT A

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Disconnect TCM harness connector.

EC

4. Check harness continuity between ECT sensor terminal 2 and ECM terminal 67, TCM terminal 42.
Refer to wiring diagram. C
Continuity should exist.

5. Also check harness for short to ground and short to power.

OK or NG

D

OK >> GO TO 5. NG >> GO TO 4.

4. DETECT MALFUNCTIONING PART

E

Check the following.

G Harness for open or short between ECT sensor and ECM

F

G Harness for open or short between ECT sensor and TCM

G >> Repair open circuit or short to ground or short to power in harness or connectors.

5. CHECK ENGINE COOLANT TEMPERATURE SENSOR

H

Refer to EC-203, "Component Inspection" .

OK or NG

OK >> GO TO 6.

I

NG >> Replace ECT sensor.

6. CHECK INTERMITTENT INCIDENT

J

Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Component Inspection
ENGINE COOLANT TEMPERATURE SENSOR 1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.

K
UBS00B4X
L
M

PBIB2005E

Revision: December 2006

EC-203

2006 Sentra

DTC P0117, P0118 ECT SENSOR

<Reference data>

Engine coolant temperature °C (°F)
20 (68)

Voltage* V 3.5

Resistance k 2.1 - 2.9

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

*: These data are reference values and are measured between ECM terminal 73 (Engine coolant temperature sensor) and ground.
2. If NG, replace engine coolant temperature sensor.

Removal and Installation
ENGINE COOLANT TEMPERATURE SENSOR
Refer to EM-15, "OUTER COMPONENT PARTS" .

[QG18DE]
SEF012P UBS00B4Y

Revision: December 2006

EC-204

2006 Sentra

DTC P0122, P0123 TP SENSOR

[QG18DE]

DTC P0122, P0123 TP SENSOR Component Description

PFP:16119
A
UBS00B4Z

Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement. The throttle position sensor has the two sensors. These sensors are a kind of potentiometers which transform the throttle valve position into output voltage, and emit the voltage signal to the ECM. In addition, these sensors detect the opening and closing speed of the throttle valve and feed the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.
CONSULT-II Reference Value in Data Monitor Mode

EC
C
D
PBIB0145E
E
UBS00B50

Specification data are reference values.
MONITOR ITEM

CONDITION

F
SPECIFICATION

G Ignition switch: ON

Accelerator pedal: Fully released More than 0.36V

THRTL SEN 1

(Engine stopped)

THRTL SEN 2*

G Shift lever: D (A/T), 1st (M/T) Accelerator pedal: Fully depressed Less than 4.75V

G

*: Throttle position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.

On Board Diagnosis Logic

H
UBS00B51

These self-diagnoses have the one trip detection logic.

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

I

P0122 0122
P0123 0123

Throttle position sensor 2 An excessively low voltage from the TP sensor 2 G Harness or connectors

circuit low input

is sent to ECM.

(The TP sensor 2 circuit is open or

shorted.)

J

(The APP sensor 2 circuit is shorted.)

Throttle position sensor 2 An excessively high voltage from the TP sensor 2 G Electric throttle control actuator

circuit high input

is sent to ECM.

(TP sensor 2)
K
G Accelerator pedal position sensor

(APP sensor 2)

FAIL-SAFE MODE

L

When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

Engine operation condition in fail-safe mode

M

The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. So, the acceleration will be poor.

Revision: December 2006

EC-205

2006 Sentra

DTC P0122, P0123 TP SENSOR

[QG18DE]

DTC Confirmation Procedure

UBS00B52

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for 1 second. 4. If DTC is detected, go toEC-208, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-206

2006 Sentra

Wiring Diagram

DTC P0122, P0123 TP SENSOR

[QG18DE]
UBS00B53
A EC
C D E F G H I J K L M

Revision: December 2006

EC-207

BBWA2139E
2006 Sentra

DTC P0122, P0123 TP SENSOR

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

47 B

Sensor power supply (Throttle position sensor)

[Ignition switch: ON]

Approximately 5V

50 W 66 R 69 G 91 R/G

Throttle position sensor 1
Sensor ground (Throttle position sensor)
Throttle position sensor 2
Sensor power supply (Accelerator pedal position sensor 2)

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully depressed [Engine is running] G Warm-up condition G Idle speed [Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully depressed
[Ignition switch: ON]

More than 0.36V Less than 4.75V Approximately 0V Less than 4.75V More than 0.36V Approximately 5V

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS00B54

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151 .

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-208

BBIA0515E
2006 Sentra

DTC P0122, P0123 TP SENSOR
2. CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-I
1. Disconnect electric throttle control actuator harness connector. 2. Turn ignition switch ON.

[QG18DE]
A EC

C

3. Check voltage between electric throttle control actuator terminal 1 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 7. NG >> GO TO 3.

D
BBIA0152E
E
F
G

3. CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-II

PBIB0082E

H

1. Turn ignition switch OFF.

I

2. Disconnect ECM harness connector.

3. Check harness continuity between electric throttle control actuator terminal 1 and ECM terminal 47.

Refer to Wiring Diagram.

J

Continuity should exist.

OK or NG

K

OK >> GO TO 4.

NG >> Repair open circuit.

4. CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-III

L

Check harness for short to power and short to ground, between the following terminals. M

ECM terminal

Sensor terminal

Reference Wiring Diagram

47

Electric throttle control actuator terminal 1

EC-207

91

APP sensor terminal 1

EC-514

OK or NG
OK >> GO TO 5. NG >> Repair short to ground or short to power in harness or connectors.

5. CHECK APP SENSOR

Refer to EC-520, "Component Inspection"
OK or NG OK >> GO TO 11. NG >> GO TO 6.

Revision: December 2006

EC-209

2006 Sentra

DTC P0122, P0123 TP SENSOR
6. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. 2. Perform EC-79, "Accelerator Pedal Released Position Learning" . 3. Perform EC-80, "Throttle Valve Closed Position Learning" . 4. Perform EC-80, "Idle Air Volume Learning" .

[QG18DE]

>> INSPECTION END
7. CHECK THROTTLE POSITION SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 66 and electric throttle control actuator terminal 5.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 8. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK THROTTLE POSITION SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 69 and electric throttle control actuator terminal 2. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK THROTTLE POSITION SENSOR
Refer to EC-211, "Component Inspection" . OK or NG
OK >> GO TO 11. NG >> GO TO 10.
10. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. 2. Perform EC-80, "Throttle Valve Closed Position Learning" . 3. Perform EC-80, "Idle Air Volume Learning" .

>> INSPECTION END
11. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-210

2006 Sentra

DTC P0122, P0123 TP SENSOR

Component Inspection
THROTTLE POSITION SENSOR 1. Reconnect all harness connectors disconnected.
2. Perform EC-80, "Throttle Valve Closed Position Learning" .
3. Turn ignition switch ON.
4. Set selector lever to D position (A/T models) or 1st position (M/T models).
5. Check voltage between ECM terminals 50 (TP sensor 1 signal), 69 (TP sensor 2 signal) and ground under the following conditions.

Terminal

Accelerator pedal

Voltage

50 (Throttle position sensor 1)

Fully released Fully depressed

More than 0.36V Less than 4.75V

69 (Throttle position sensor 2)

Fully released Fully depressed

Less than 4.75V More than 0.36V

6. If NG, replace electric throttle control actuator and go to the next step.
7. Perform EC-80, "Throttle Valve Closed Position Learning" .
8. Perform EC-80, "Idle Air Volume Learning" .

Removal and Installation
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EM-15, "Removal and Installation" .

[QG18DE]
UBS00B55
A

EC

C

D

E

PBIB1060E

F

G
UBS00B56
H

I

J

K

L

M

Revision: December 2006

EC-211

2006 Sentra

DTC P0125 ECT SENSOR
DTC P0125 ECT SENSOR
Component Description
NOTE: If DTC P0125 is displayed with P0117, P0118, first perform trouble diagnosis for EC-199, "DTC P0117, P0118 ECT SENSOR" . The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

[QG18DE]
PFP:22630
UBS00B57

SEF594K

<Reference data>

Engine coolant temperature °C (°F)

Voltage* V

Resistance k

-10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.1 - 2.9

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

*: These data are reference values and are measured between ECM terminal 73 (Engine coolant temperature sensor) and ground.

SEF012P

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may damage the ECM's transistor. Use ground other than ECM, such as body ground.

On Board Diagnosis Logic

UBS00B58

DTC No.
P0125 0125

Trouble diagnosis name
Insufficient engine coolant temperature for closed loop fuel control

DTC detecting condition
G Voltage sent to ECM from the sensor is not practical, even when some time has passed after starting the engine.
G Engine coolant temperature is insufficient for closed loop fuel control.

Possible cause
G Harness or connectors (High resistance in the circuit)
G Engine coolant temperature sensor G Thermostat

Revision: December 2006

EC-212

2006 Sentra

DTC P0125 ECT SENSOR

[QG18DE]

DTC Confirmation Procedure
CAUTION: Be careful not to overheat engine.

UBS00B59
A

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

EC

least 10 seconds before conducting the next test.

WITH CONSULT-II
1. Turn ignition switch ON.
2. Select "DATA MONITOR" mode with CONSULT-II.
3. Check that "COOLAN TEMP/S" is above 10°C (50°F). If it is above 10°C (50°F), the test result will be OK. If it is below 10°C (50°F), go to following step.
4. Start engine and run it for 65 minutes at idle speed. If "COOLAN TEMP/S" increases to more than 10°C (50°F) within 65 minutes, stop engine because the test result will be OK.
5. If 1st trip DTC is detected, go to EC-213, "Diagnostic Procedure" .

C D E
F
SEF174Y

WITH GST

G

Follow the procedure "WITH CONSULT-II" above.

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS00B5A

H

1. Turn ignition switch OFF.

2. Loosen and retighten two ground screws on the body. Refer to EC-151 .

I

J

K

L

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. CHECK ENGINE COOLANT TEMPERATURE SENSOR

BBIA0515E
M

Refer to EC-214, "Component Inspection" . OK or NG
OK >> GO TO 3. NG >> Replace engine coolant temperature sensor.
3. CHECK THERMOSTAT OPERATION

When the engine is cooled [lower than 75°C (167°F)], grasp lower radiator hose and confirm the engine coolant does not flow.
OK or NG
OK >> GO TO 4. NG >> Repair or replace thermostat. Refer to CO-12, "THERMOSTAT AND THERMOSTAT HOUSING" .

Revision: December 2006

EC-213

2006 Sentra

DTC P0125 ECT SENSOR
4. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Component Inspection
ENGINE COOLANT TEMPERATURE SENSOR Check resistance between engine coolant temperature sensor terminals 1 and 2 as shown in the figure.

[QG18DE]
UBS00B5B

<Reference data>

Temperature °C (°F) 20 (68) 50 (122) 90 (194)

Resistance k 2.1 - 2.9 0.68 - 1.0
0.236 - 0.260

If NG, replace engine coolant temperature sensor.

Removal and Installation
ENGINE COOLANT TEMPERATURE SENSOR
Refer to EM-15, "OUTER COMPONENT PARTS" .

PBIB2005E
SEF012P UBS00B5C

Revision: December 2006

EC-214

2006 Sentra

DTC P0127 IAT SENSOR
DTC P0127 IAT SENSOR Component Description
The intake air temperature sensor is built into mass air flow sensor. The sensor detects intake air temperature and transmits a signal to the ECM. The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rise.

[QG18DE]
PFP:22630
A
UBS00B5D
EC
C

D

<Reference data>

PBIB1604E
E

Intake air temperature °C (°F)

Voltage* V

Resistance k

25 (77)

3.3

1.800 - 2.200

80 (176)

1.2

0.283 - 0.359

*: These data are reference values and are measured between ECM terminal 34 (Intake air temperature sensor) and ground.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis Logic

F
G
H
SEF012P
I
UBS00B5E

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

J

P0127 0127

Intake air temperature too high

Rationally incorrect voltage from the sensor is sent to ECM, compared with the voltage signal from engine coolant temperature sensor.

G Harness or connectors (The sensor circuit is open or shorted)
G Intake air temperature sensor

K

DTC Confirmation Procedure

UBS00B5F

NOTE:

L

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

CAUTION:

M

Always drive vehicle at a safe speed.

TESTING CONDITION:

This test may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road

test is expected to be easier, it is unnecessary to lift the vehicle.

Revision: December 2006

EC-215

2006 Sentra

DTC P0127 IAT SENSOR
WITH CONSULT-II 1. Wait until engine coolant temperature is less than 90°C (194°F) a. Turn ignition switch ON. b. Select "DATA MONITOR" mode with CONSULT-II. c. Check the engine coolant temperature. d. If the engine coolant temperature is not less than 90°C (194°F),
turn ignition switch OFF and cool down engine. G Perform the following steps before engine coolant tempera-
ture is above 90°C (194°F). 2. Turn ignition switch ON. 3. Select "DATA MONITOR" mode with CONSULT-II. 4. Start engine. 5. Hold vehicle speed at more than 70 km/h (43 MPH) for 100 con-
secutive seconds. 6. If 1st trip DTC is detected, go to EC-216, "Diagnostic Procedure" .
WITH GST Follow the procedure "WITH CONSULT-II" above.
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151 .

[QG18DE]
SEF189Y UBS00B5G

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. CHECK INTAKE AIR TEMPERATURE SENSOR
Refer to EC-217, "Component Inspection" . OK or NG
OK >> GO TO 3. NG >> Replace mass air flow sensor (with intake air temperature sensor).
3. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END

Revision: December 2006

EC-216

BBIA0515E
2006 Sentra

DTC P0127 IAT SENSOR
Component Inspection
INTAKE AIR TEMPERATURE SENSOR 1. Check resistance between intake air temperature sensor termi-
nals 5 and 6 under the following conditions.

Intake air temperature °C (°F)

Resistance k

25 (77)

1.800 - 2.200

2. If NG, replace mass air flow sensor (with intake air temperature sensor).

[QG18DE]
UBS00B5H
A EC
C D
PBIB1604E
E
F G H
SEF012P
I J K L M

Revision: December 2006

EC-217

2006 Sentra

DTC P0128 THERMOSTAT FUNCTION

[QG18DE]

DTC P0128 THERMOSTAT FUNCTION

PFP:21200

On Board Diagnosis Logic

UBS00B5I

Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long enough. This is due to a leak in the seal or the thermostat stuck open.

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0128 0128

Thermostat function

The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.

G Thermostat G Leakage from sealing portion of thermo-
stat G Engine coolant temperature sensor

DTC Confirmation Procedure

UBS00B5J

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION:
G For best results, perform at ambient temperature of ­10°C (14°F) or higher.
G For best results, perform at engine coolant temperature of ­10°C (14°F) to 68°C (154°F).

WITH CONSULT-II
1. Replace thermostat with new one. Refer to CO-12, "THERMOSTAT AND THERMOSTAT HOUSING" . Use only a genuine NISSAN thermostat as a replacement. If an incorrect thermostat is used, the MIL may come on.
2. Turn ignition switch ON.
3. Select "COOLAN TEMP/S" in "DATA MONITOR" mode with CONSULT-II.
4. Check that the "COOLAN TEMP/S" is above 68°C (154°F). If it is below 68°C (154°F), go to following step. If it is above 68°C (154°F), cool down the engine to less than 60°C (140°F), then retry from step 1.
5. Drive vehicle for 10 consecutive minutes under the following conditions.

VHCL SPEED SE

80 - 120 km/h (50 - 75 MPH)

If 1st trip DTC is detected, go to EC-218, "Diagnostic Procedure" .
WITH GST 1. Follow the procedure "WITH CONSULT-II" above.
Diagnostic Procedure
1. CHECK ENGINE COOLANT TEMPERATURE SENSOR

UBS00B5K

Refer to EC-219, "Component Inspection" . OK or NG
OK >> INSPECTION END NG >> Replace engine coolant temperature sensor.

Revision: December 2006

EC-218

2006 Sentra

DTC P0128 THERMOSTAT FUNCTION
Component Inspection
ENGINE COOLANT TEMPERATURE SENSOR Check resistance between engine coolant temperature sensor terminals 1 and 2 as shown in the figure.

<Reference data>

Temperature °C (°F) 20 (68) 50 (122) 90 (194)

Resistance k 2.1 - 2.9 0.68 - 1.0
0.236 - 0.260

If NG, replace engine coolant temperature sensor.

Removal and Installation
ENGINE COOLANT TEMPERATURE SENSOR
Refer to CO-12, "THERMOSTAT AND THERMOSTAT HOUSING" .

[QG18DE]
UBS00B5L
A
EC
C
D
PBIB2005E
E
F
G
H
SEF012P UBS00B5M
I
J
K
L
M

Revision: December 2006

EC-219

2006 Sentra

DTC P0130 A/F SENSOR 1
DTC P0130 A/F SENSOR 1
Component Description
The A/F sensor 1 is a planar dual-cell limit current sensor. The sensor element of the A/F sensor 1 is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element. The sensor is capable of precise measurement = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide range (0.7 <
< air). The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygenpump cell so that the composition of the exhaust gas in the diffusion gap remains constant at = 1. Therefore, the A/F sensor 1 is able to indicate air-fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800°C (1,292 - 1,472°F).

[QG18DE]
PFP:22693
UBS00BE5
SEF579Z

CONSULT-II Reference Value in Data Monitor Mode

SEF580Z UBS00BE6

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

A/F SEN1 (B1)

G Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5V

On Board Diagnosis Logic

UBS00BE7

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the air fuel ratio (A/ F) sensor 1 signal fluctuates according to fuel feedback control.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P0130 0130

Air fuel ratio (A/F) G The A/F signal computed by ECM from the A/F

sensor 1 circuit

sensor 1 signal is constantly approx. 1.5V.

G Harness or connectors (The sensor circuit is open or shorted.)
G Air fuel ratio (A/F) sensor 1

DTC Confirmation Procedure

UBS00BE8

CAUTION: Always drive vehicle at a safe speed.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

WITH CONSULT-II
1. Start engine and warm it up to normal operating temperature. 2. Select "A/F SEN1 (B1)" of "DATA MONITOR" mode with CONSULT-II.
3. Check "A/F SEN1 (B1)" indication. If the indication is constantly approx. 1.5V and does not fluctuates, go to EC-224, "Diagnostic Procedure" . If the indication fluctuates around 1.5V, go to next step.

Revision: December 2006

EC-220

2006 Sentra

DTC P0130 A/F SENSOR 1

4. Select "A/F SEN1 (B1) P1276" of "A/F SEN1" in "DTC WORK SUPPORT" mode.
5. Touch "START". 6. When the following conditions are met, "TESTING" will be dis-
played on the CONSULT-II screen.

ENG SPEED
Vehicle speed B/FUEL SCHDL Selector lever

1,750 - 2,000 rpm (A/T) 1,750 - 2,900 rpm (M/T) More than 65 km/h (40 MPH) 1.0 - 8.0 msec G D position with "OD" OFF (A/T) G 4th position (M/T)

If "TESTING" is not displayed after 20 seconds, retry from step 2.

7. Following the instructions of CONSULT-II screen, set D position with "OD" OFF (A/T) or 3rd position (M/T) and release accelerator pedal fully.

[QG18DE]
A
EC
C
D
SEF576Z
E
F

G

8. Make sure that "TESTING" changes to "COMPLETED". If "TESTING" changed to "OUT OF CONDITION", retry from step 6.
9. Make sure that OK is displayed after touching "SELF-DIAG RESULT". If NG is displayed, go to EC-224, "Diagnostic Procedure" .

H
SEF577Z
I
J
K

L
SEF578Z

Overall Function Check

UBS00BE9

Use this procedure to check the overall function of the A/F sensor 1 circuit. During this check, a 1st trip DTC M

might not be confirmed.

WITH GST

1. Start engine and warm it up to normal operating temperature.
2. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in D position with "OD" OFF (A/T) or 3rd position (M/T).
NOTE: Keep the accelerator pedal as steady as possible during the cruising.
3. Set D position with "OD" OFF (A/T) or 4th position (M/T), then release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30 MPH).
NOTE: Never apply brake during releasing the accelerator pedal.
4. Repeat steps 2 to 3 five times.
5. Stop the vehicle and turn ignition switch OFF.
6. Wait at least 10 seconds and restart engine.

Revision: December 2006

EC-221

2006 Sentra

DTC P0130 A/F SENSOR 1
7. Repeat steps 2 to 3 five times. 8. Stop the vehicle and connect GST to the vehicle. 9. Make sure that no DTC is displayed.
If the DTC is displayed, go to EC-224, "Diagnostic Procedure" .

[QG18DE]

Revision: December 2006

EC-222

2006 Sentra

Wiring Diagram

DTC P0130 A/F SENSOR 1

[QG18DE]
UBS00BEA
A EC
C D E F G H I J K L M

Revision: December 2006

EC-223

BBWA1454E
2006 Sentra

DTC P0130 A/F SENSOR 1

[QG18DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

[Engine is running] G Warm-up condition G Idle speed

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

Approximately 3.1V Approximately 2.6V 2 - 3V 2 - 3V

PBIB1584E

UBS00BEB

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

BBIA0515E

Revision: December 2006

EC-224

2006 Sentra

DTC P0130 A/F SENSOR 1
2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect air fuel ratio (A/F) sensor 1 harness connector. 2. Turn ignition switch ON.
3. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 4. NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M19, E108 G Harness connectors E10, F48 G Fuse block (J/B) connector M1 G 15A fuse G Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors.

[QG18DE]
A EC
C D
BBIA0140E
E F G H
PBIB1683E
I J K L M

Revision: December 2006

EC-225

2006 Sentra

DTC P0130 A/F SENSOR 1

4. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF. 2. Check harness continuity between the following terminals. Refer to Wiring Diagram.

A/F sensor 1 terminal 1 2 5 6

ECM terminal 16 75 35 56

[QG18DE]

Continuity should exist.
3. Check harness continuity between ECM terminals 16, 35, 56, 75 or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to Wiring Diagram.
Continuity should not exist.
4. Also check harness for short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . OK or NG
OK >> GO TO 6. NG >> Repair or replace.
6. REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1. CAUTION: G Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one. G Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> INSPECTION END
Removal and Installation
AIR FUEL RATIO SENSOR 1 Refer to EM-15, "Removal and Installation" .

UBS00BEC

Revision: December 2006

EC-226

2006 Sentra

DTC P0131 A/F SENSOR 1
DTC P0131 A/F SENSOR 1
Component Description
The A/F sensor 1 is a planar dual-cell limit current sensor. The sensor element of the A/F sensor 1 is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element. The sensor is capable of precise measurement = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide range (0.7 <
< air). The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygenpump cell so that the composition of the exhaust gas in the diffusion gap remains constant at = 1. Therefore, the A/F sensor 1 is able to indicate air-fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800°C (1,292 - 1,472°F).

[QG18DE]
PFP:22693
A
UBS00BD9
EC
C
D
SEF579Z
E
F
G

H

CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.

SEF580Z

UBS00BDA

I

MONITOR ITEM

CONDITION

SPECIFICATION

A/F SEN1 (B1)

G Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5V

J

On Board Diagnosis Logic

UBS00BDB

K

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the air fuel ratio (A/ F) sensor 1 signal is not inordinately low.

DTC No.

Trouble diagnosis name

DTC detecting condition

L
Possible Cause

P0131 0131

G Harness or connectors

Air fuel ratio (A/F) sen- G The A/F signal computed by ECM from the

(The sensor circuit is open or shorted.) M

sor 1 circuit low voltage A/F sensor 1 signal is constantly approx. 0V.

G Air fuel ratio (A/F) sensor 1

DTC Confirmation Procedure

UBS00 BD C

CAUTION: Always drive vehicle at a safe speed.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10.5V at idle.

WITH CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Select "A/F SEN1 (B1)" in "DATA MONITOR" mode with CONSULT-II.

Revision: December 2006

EC-227

2006 Sentra

DTC P0131 A/F SENSOR 1
3. Check "A/F SEN1 (B1)" indication. If the indication is constantly approx. 0V, go to EC-231, "Diagnostic Procedure" . If the indication is not constantly approx. 0V, go to next step.
4. Select "A/F SEN1 (B1) P1278/P1279" of "A/F SEN1" in "DTC WORK SUPPORT" mode.
5. Touch "START".

6. When the following conditions are met, "TESTING" will be displayed on the CONSULT-II screen.

ENG SPEED Vehicle speed B/FUEL SCHDL Selector lever

1,000 - 3,200 rpm More than 40 km/h (25 MPH) 1.5 - 9.0 msec G D position with "OD" OFF (A/T) G 4th position (M/T)

If "TESTING" is not displayed after 20 seconds, retry from step 2.

7. Following the instructions of CONSULT-II screen, set D position with "OD" OFF (A/T) or 3rd position (M/T) and release accelerator pedal fully.

[QG18DE]
SEF581Z PBIB0756E

8. Make sure that "TESTING" changes to "COMPLETED". If "TESTING" changed to "OUT OF CONDITION", retry from step 6.
9. Touch "BACK" and "MODE", then select "SELF-DIAG RESULT" mode. If P0131 is displayed, go to EC-231, "Diagnostic Procedure" . If another DTC is displayed, go to the corresponding "Diagnostic Procedure".

PBIB0757E

PBIB0758E

Overall Function Check

UBS00BDD

Use this procedure to check the overall function of the A/F sensor 1 circuit. During this check, a 1st trip DTC might not be confirmed.

WITH GST

1. Start engine and warm it up to normal operating temperature.
2. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in D position with "OD" OFF (A/T) or 3rd position (M/T).

Revision: December 2006

EC-228

2006 Sentra

DTC P0131 A/F SENSOR 1

[QG18DE]

NOTE:

Keep the accelerator pedal as steady as possible during the cruising.

A

3. Set D position with "OD" OFF (A/T) or 4th position (M/T), then release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30 MPH).

NOTE:

EC

Never apply brake during releasing the accelerator pedal.

4. Repeat steps 2 to 3 five times.

5. Stop the vehicle and turn ignition switch OFF.

C

6. Wait at least 10 seconds and restart engine.

7. Repeat steps 2 to 3 five times.

8. Stop the vehicle and connect GST to the vehicle.

D

9. Make sure that no DTC is displayed. If the DTC is displayed, go to EC-231, "Diagnostic Procedure" . E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-229

2006 Sentra

Wiring Diagram

DTC P0131 A/F SENSOR 1

[QG18DE]
UBS00BDE

Revision: December 2006

EC-230

BBWA1454E
2006 Sentra

DTC P0131 A/F SENSOR 1

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)
C

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

[Engine is running] G Warm-up condition G Idle speed

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

D

E

PBIB1584E

Approximately 3.1V

Approximately 2.6V

F

2 - 3V

2 - 3V

G

UBS00BDF

H

1. Turn ignition switch OFF.

2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

I

J

K

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

L
BBIA0515E
M

Revision: December 2006

EC-231

2006 Sentra

DTC P0131 A/F SENSOR 1
2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect air fuel ratio (A/F) sensor 1 harness connector. 2. Turn ignition switch ON.

[QG18DE]

3. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 4. NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M19, E108 G Harness connectors E10, F48 G Fuse block (J/B) connector M1 G 15A fuse G Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors.

BBIA0140E PBIB1683E

Revision: December 2006

EC-232

2006 Sentra

DTC P0131 A/F SENSOR 1

4. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF. 2. Check harness continuity between the following terminals. Refer to Wiring Diagram.

A/F sensor 1 terminal 1 2 5 6

ECM terminal 16 75 35 56

Continuity should exist.

[QG18DE]
A EC
C D

3. Check harness continuity between ECM terminals 16, 35, 56, 75 or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to Wiring Diagram.

E

Continuity should not exist.

4. Also check harness for short to power.

F

OK or NG

OK >> GO TO 5.

NG >> Repair open circuit or short to ground or short to power in harness or connectors.

G

5. CHECK INTERMITTENT INCIDENT

H Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

OK or NG

OK >> GO TO 6.

I

NG >> Repair or replace.

6. REPLACE AIR FUEL RATIO (A/F) SENSOR 1 J

Replace air fuel ratio (A/F) sensor 1.

CAUTION: G Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a K
hard surface such as a concrete floor; use a new one.

G Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread

Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

L

>> INSPECTION END
Removal and Installation
AIR FUEL RATIO SENSOR 1 Refer to EM-15, "Removal and Installation" .

M
UBS00BDG

Revision: December 2006

EC-233

2006 Sentra

DTC P0132 A/F SENSOR 1
DTC P0132 A/F SENSOR 1
Component Description
The A/F sensor 1 is a planar dual-cell limit current sensor. The sensor element of the A/F sensor 1 is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element. The sensor is capable of precise measurement = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide range (0.7 <
< air). The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygenpump cell so that the composition of the exhaust gas in the diffusion gap remains constant at = 1. Therefore, the A/F sensor 1 is able to indicate air-fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800°C (1,292 - 1,472°F).

[QG18DE]
PFP:22693
UBS00BDH
SEF579Z

CONSULT-II Reference Value in Data Monitor Mode

SEF580Z UBS00BDI

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

A/F SEN1 (B1)

G Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5V

On Board Diagnosis Logic

UBS00BDJ

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the air fuel ratio (A/ F) sensor 1 signal is not inordinately high.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P0132 0132

Air fuel ratio (A/F) sensor 1 circuit high voltage

G The A/F signal computed by ECM from the A/F sensor 1 signal is constantly approx. 4.5V.

G Harness or connectors (The sensor circuit is open or shorted.)
G Air fuel ratio (A/F) sensor 1

DTC Confirmation Procedure

UBS00BDK

CAUTION: Always drive vehicle at a safe speed.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

WITH CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Select "A/F SEN1 (B1)" in "DATA MONITOR" mode with CONSULT-II.

Revision: December 2006

EC-234

2006 Sentra

DTC P0132 A/F SENSOR 1
3. Check "A/F SEN1 (B1)" indication. If the indication is constantly approx. 4.5V, go to EC-238, "Diagnostic Procedure" . If the indication is not constantly approx. 4.5V, go to next step.
4. Select "A/F SEN1 (B1) P1278/P1279" of "A/F SEN1" in "DTC WORK SUPPORT" mode.
5. Touch "START".

6. When the following conditions are met, "TESTING" will be displayed on the CONSULT-II screen.

ENG SPEED Vehicle speed B/FUEL SCHDL Selector lever

1,000 - 3,200 rpm More than 40 km/h (25 MPH) 1.5 - 9.0 msec G D position with "OD" OFF (A/T) G 4th position (M/T)

If "TESTING" is not displayed after 20 seconds, retry from step 2.

7. Following the instructions of CONSULT-II screen, set D position with "OD" OFF (A/T) or 3rd position (M/T) and release accelerator pedal fully.

[QG18DE]
A
EC
C
SEF581Z
D
E
F
G
PBIB0756E
H
I

J

8. Make sure that "TESTING" changes to "COMPLETED". If "TESTING" changed to "OUT OF CONDITION", retry from step 6.
9. Touch "BACK" and "MODE", then select "SELF-DIAG RESULT" mode. If P0132 is displayed, go to EC-238, "Diagnostic Procedure" . If another DTC is displayed, go to the corresponding Diagnostic Procedure.

K
PBIB0757E
L
M

PBIB0758E

Overall Function Check

UBS00BDL

Use this procedure to check the overall function of the A/F sensor 1 circuit. During this check, a 1st trip DTC might not be confirmed.

WITH GST

1. Start engine and warm it up to normal operating temperature.
2. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in D position with "OD" OFF (A/T) or 3rd position (M/T).

Revision: December 2006

EC-235

2006 Sentra

DTC P0132 A/F SENSOR 1

[QG18DE]

NOTE: Keep the accelerator pedal as steady as possible during the cruising.
3. Set D position with "OD" OFF (A/T) or 4th position (M/T), then release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30 MPH). NOTE: Never apply brake during releasing the accelerator pedal.
4. Repeat steps 2 to 3 five times.
5. Stop the vehicle and turn ignition switch OFF. 6. Wait at least 10 seconds and restart engine.
7. Repeat steps 2 to 3 five times. 8. Stop the vehicle and connect GST to the vehicle. 9. Make sure that no DTC is displayed.
If the DTC is displayed, go to EC-238, "Diagnostic Procedure" .

Revision: December 2006

EC-236

2006 Sentra

Wiring Diagram

DTC P0132 A/F SENSOR 1

[QG18DE]
UBS00BDM
A EC
C D E F G H I J K L M

Revision: December 2006

EC-237

BBWA1454E
2006 Sentra

DTC P0132 A/F SENSOR 1

[QG18DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

[Engine is running] G Warm-up condition G Idle speed

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

Approximately 3.1V Approximately 2.6V 2 - 3V 2 - 3V

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

PBIB1584E UBS00BDN

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

BBIA0515E

Revision: December 2006

EC-238

2006 Sentra

DTC P0132 A/F SENSOR 1
2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect air fuel ratio (A/F) sensor 1 harness connector. 2. Turn ignition switch ON.
3. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 4. NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M19, E108 G Harness connectors E10, F48 G Fuse block (J/B) connector M1 G 15A fuse G Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors.

[QG18DE]
A EC
C D
BBIA0140E
E F G H
PBIB1683E
I J K L M

Revision: December 2006

EC-239

2006 Sentra

DTC P0132 A/F SENSOR 1

4. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF. 2. Check harness continuity between the following terminals. Refer to Wiring Diagram.

A/F sensor 1 terminal 1 2 5 6

ECM terminal 16 75 35 56

[QG18DE]

Continuity should exist.
3. Check harness continuity between ECM terminals 16, 35, 56, 75 or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to Wiring Diagram.
Continuity should not exist.
4. Also check harness for short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . OK or NG
OK >> GO TO 6. NG >> Repair or replace.
6. REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1. CAUTION: G Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one. G Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> INSPECTION END
Removal and Installation
AIR FUEL RATIO SENSOR 1 Refer to EM-15, "Removal and Installation" .

UBS00BDO

Revision: December 2006

EC-240

2006 Sentra

DTC P0133 A/F SENSOR 1
DTC P0133 A/F SENSOR 1
Component Description
The A/F sensor 1 is a planar dual-cell limit current sensor. The sensor element of the A/F sensor 1 is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element. The sensor is capable of precise measurement = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide range (0.7 <
< air). The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygenpump cell so that the composition of the exhaust gas in the diffusion gap remains constant at = 1. Therefore, the A/F sensor 1 is able to indicate air/fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800°C (1,292 - 1,472°F).

[QG18DE]
PFP:22693
A
UBS00BED
EC
C
D
SEF579Z
E
F
G

H

CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.

SEF580Z

UBS00BEE

I

MONITOR ITEM

CONDITION

SPECIFICATION

A/F SEN1 (B1)

G Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5V

J

On Board Diagnosis Logic

UBS00BEF

K

To judge the malfunction of air fuel ratio (A/F) sensor 1, this diagnosis measures response time of the A/F sig-

nal computed by ECM from the air fuel ratio (A/F) sensor 1 signal. The time is compensated by engine operat-

ing (speed and load), fuel feedback control constant, and the air fuel ratio (A/F) sensor 1 temperature index. L Judgment is based on whether the compensated time (the A/F signal cycling time index) is inordinately long or

not.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

M

P0133 0133

Air fuel ratio (A/F) sensor 1 circuit slow response

G The response of the A/F signal computed by ECM from A/F sensor 1 signal takes more than the specified time.

G Harness or connectors (The sensor circuit is open or shorted.)
G Air fuel ratio (A/F) sensor 1 G Air fuel ratio (A/F) sensor heater 1 G Fuel pressure G Fuel injector G Intake air leaks G Exhaust gas leaks G PCV G Mass air flow sensor

Revision: December 2006

EC-241

2006 Sentra

DTC P0133 A/F SENSOR 1

[QG18DE]

DTC Confirmation Procedure

UBS00BEG

CAUTION: Always drive vehicle at a safe speed.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

WITH CONSULT-II

1. Perform EC-80, "Idle Air Volume Learning" . Make sure that "CMPLT" is displayed on CONSULT-II screen. If "INCMP" is displayed, follow the instruction for Idle Air Volume Learning.
2. Select "A/F SEN1 (B1) P1278/P1279" of "A/F SEN1" in "DTC WORK SUPPORT" mode.
3. Touch "START".
4. When the following conditions are met, "TESTING" will be displayed on the CONSULT-II screen.

ENG SPEED
Vehicle speed B/FUEL SCHDL Selector lever

1,750 - 2,000 rpm (A/T) 1,750 - 2,900 rpm (M/T) More than 65 km/h (40 MPH) 1.0 - 8.0 msec G D position with "OD" OFF (A/T) G 4th position (M/T)

If "TESTING" is not displayed after 20 seconds, retry from step 2.

PBIB0756E

5. Following the instructions of CONSULT-II screen, set D position with "OD" OFF (A/T) or 3rd position (M/T) and release accelerator pedal fully.

6. Make sure that "TESTING" changes to "COMPLETED". If "TESTING" changed to "OUT OF CONDITION", retry from step 6.
7. Make sure that OK is displayed after touching "SELF-DIAG RESULT". If NG is displayed, go to EC-245, "Diagnostic Procedure" .

PBIB0757E

PBIB0758E

Overall Function Check

UBS00BEP

Use this procedure to check the overall function of the A/F sensor 1 circuit. During this check, a 1st trip DTC might not be confirmed.

WITH GST

1. Perform EC-80, "Idle Air Volume Learning" . Make sure the result is OK. If NG, follow the instruction for Idle Air Volume Learning.

Revision: December 2006

EC-242

2006 Sentra

DTC P0133 A/F SENSOR 1

[QG18DE]

2. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in D position with "OD" OFF (A/T) or

3rd position (M/T).

A

NOTE: Keep the accelerator pedal as steady as possible during the cruising.

3. Set D position with "OD" OFF (A/T) or 4th position (M/T), then release the accelerator pedal fully until the EC vehicle speed decreases to 50 km/h (30 MPH).

NOTE:

Never apply brake during releasing the accelerator pedal.

C

4. Repeat steps 2 to 3 five times.

5. Stop the vehicle and turn ignition switch OFF.

6. Wait at least 10 seconds and restart engine.

D

7. Repeat steps 2 to 3 five times.

8. Stop the vehicle and connect GST to the vehicle.

9. Make sure that no DTC is displayed.

E

If the DTC is displayed, go to EC-245, "Diagnostic Procedure" .

F

G

H

I

J

K

L

M

Revision: December 2006

EC-243

2006 Sentra

Wiring Diagram

DTC P0133 A/F SENSOR 1

[QG18DE]
UBS00BEI

Revision: December 2006

EC-244

BBWA1454E
2006 Sentra

DTC P0133 A/F SENSOR 1

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)
C

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

[Engine is running] G Warm-up condition G Idle speed

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

D

E

PBIB1584E

Approximately 3.1V

Approximately 2.6V

F

2 - 3V

2 - 3V

G

UBS00BEJ

H

I

J

K

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1
Loosen and retighten the air fuel ratio (A/F) sensor 1. Tightening torque: 40 - 60 N-m (4.1 - 6.1 kg-m, 30 - 44 ft-lb)
>> GO TO 3.

L

BBIA0515E

M

Revision: December 2006

EC-245

2006 Sentra

DTC P0133 A/F SENSOR 1
3. CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle. 2. Listen for an exhaust gas leak before three way catalyst (manifold).

[QG18DE]

OK or NG OK >> GO TO 4. NG >> Repair or replace.
4. CHECK FOR INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor. OK or NG
OK >> GO TO 5. NG >> Repair or replace.

PBIB1216E

Revision: December 2006

EC-246

2006 Sentra

DTC P0133 A/F SENSOR 1
5. CLEAR THE SELF-LEARNING DATA
With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT-II. 3. Clear the self-learning control coefficient by touching "CLEAR"
or "START". 4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?

[QG18DE]
A EC
C D

Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF.
3. Disconnect mass air flow sensor harness connector, and restart and run engine for at least 3 seconds at idle speed.
4. Stop engine and reconnect mass air flow sensor harness connector.
5. Make sure DTC P0102 is displayed.
6. Erase the DTC memory. Refer to EC-63, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" .
7. Make sure DTC P0000 is displayed.
8. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?
Yes or No
Yes >> Perform trouble diagnosis for DTC P0171, P0172. Refer to EC-277 , EC-285 . No >> GO TO 6.

E
SEF215Z
F
G
H
I
J
BBIA0516E
K
L

M

Revision: December 2006

EC-247

2006 Sentra

DTC P0133 A/F SENSOR 1
6. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect air fuel ratio (A/F) sensor 1 harness connector. 3. Turn ignition switch ON.

[QG18DE]

4. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 8. NG >> GO TO 7.
7. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M19, E108 G Harness connectors E10, F48 G Fuse block (J/B) connector M1 G 15A fuse G Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors.

BBIA0140E PBIB1683E

Revision: December 2006

EC-248

2006 Sentra

DTC P0133 A/F SENSOR 1

[QG18DE]

8. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT A

1. Turn ignition switch OFF.

2. Check harness continuity between the following terminals. Refer to Wiring Diagram.

EC

A/F sensor 1 terminal

ECM terminal

1

16

2

75

C

5

35

6

56

D

Continuity should exist.

3. Check harness continuity between ECM terminals 16, 35, 56, 75 or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to Wiring Diagram.

E

Continuity should exist.

4. Also check harness for short to power.

F

OK or NG

OK >> GO TO 9.

NG >> Repair open circuit or short to ground or short to power in harness or connectors.

G

9. CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER

H Refer to EC-165, "Component Inspection" .

OK or NG

OK >> GO TO 10.

I

NG >> GO TO 13.

10. CHECK MASS AIR FLOW SENSOR J

Refer to EC-184, "Component Inspection" .

OK or NG

OK >> GO TO 11.

K

NG >> Replace mass air flow sensor.

11. CHECK PCV VALVE

L

Refer toEC-48, "POSITIVE CRANKCASE VENTILATION" .

OK or NG

M

OK >> GO TO 12.

NG >> Repair or replace PCV valve.

12. CHECK INTERMITTENT INCIDENT

Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
OK or NG OK >> GO TO 13. NG >> Repair or replace.

Revision: December 2006

EC-249

2006 Sentra

DTC P0133 A/F SENSOR 1
13. REPLACE AIR FUEL RATIO (A/F) SENSOR 1

[QG18DE]

Replace air fuel ratio (A/F) sensor 1.
CAUTION: G Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
G Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> INSPECTION END
Removal and Installation
AIR FUEL RATIO SENSOR 1 Refer to EM-15, "Removal and Installation" .

UBS00BEK

Revision: December 2006

EC-250

2006 Sentra

DTC P0137 HO2S2
DTC P0137 HO2S2
Component Description
The heated oxygen sensor 2, after three way catalyst (manifold), monitors the oxygen level in the exhaust gas. Even if switching characteristics of the air fuel ratio (A/F) sensor 1 are shifted, the air fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2. This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 2 is not used for engine control operation.

[QG18DE]
PFP:226A0
A
UBS00 BC D
EC
C
D

CONSULT-II Reference Value in Data Monitor Mode

SEF327R
E
UBS00BCE

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

F

HO2S2 (B1) HO2S2 MNTR (B1)

G Revving engine from idle to 3,000 rpm quickly after the follow- 0 - 0.3V  0.6 - 1.0V ing conditions are met.

­ Engine: After warming up

G

­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 LEAN  RICH

minute and at idle for 1 minute under no load

On Board Diagnosis Logic

H
UBS00BCF

The heated oxygen sensor 2 has a much longer switching time

between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen storage capacity of the three way catalyst (manifold) causes the

I

longer switching time. To judge the malfunctions of heated oxygen

sensor 2, ECM monitors whether the maximum voltage of the sensor

is sufficiently high during the various driving condition such as fuel-

J

cut.

K

SEF559Z
L

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

G Harness or connectors

M

(The sensor circuit open or shorted.)

P0137 0137

Heated oxygen sensor 2 cir- The maximum voltage from the sensor is

cuit low voltage

not reached to the specified voltage.

G Heated oxygen sensor 2 G Fuel pressure

G Fuel injector

G Intake air leaks

Revision: December 2006

EC-251

2006 Sentra

DTC P0137 HO2S2

[QG18DE]

DTC Confirmation Procedure

UBS00BCG

NOTE: If DTC confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II

TESTING CONDITION: For the best results, perform "DTC WORK SUPPORT" at a temperature of 0 to 30°C (32 to 86°F).

1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.

2. Start engine and warm it up to the normal operating temperature.

3. Turn ignition switch OFF and wait at least 10 seconds.

4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

5. Let engine idle for 1 minute.

6. Make sure that "COOLAN TEMP/S" indicates more than 70°C (158°F). If not, warm up engine and go to next step when "COOLAN TEMP/S" indication reaches to 70°C (158°F).

SEF174Y

7. Open engine hood.

8. Select "HO2S2 (B1) P1147" of "HO2S2" in "DTC WORK SUPPORT" mode with CONSULT-II.

9. Start engine and follow the instruction of CONSULT-II.

NOTE: It will take at most 10 minutes until "COMPLETED" is displayed.
10. Make sure that "OK" is displayed after touching "SELF-DIAG RESULTS". If "NG" is displayed, refer to EC-255, "Diagnostic Procedure" . If "CAN NOT BE DIAGNOSED" is displayed, perform the following.
a. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
b. Return to step 1.

PBIB2373E

Overall Function Check

UBS00BCH

Use this procedure to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st trip DTC might not be confirmed.

WITH GST 1. Start engine and warm it up to the normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. 4. Let engine idle 1 minute. 5. Set voltmeter probes between ECM terminal 74 (HO2S2 signal) and ground.

Revision: December 2006

EC-252

2006 Sentra

DTC P0137 HO2S2
6. Check the voltage when revving up to 4,000 rpm under no load at least 10 times. (Depress and release accelerator pedal as soon as possible.) The voltage should be above 0.70V at least once during this procedure. If the voltage can be confirmed in step 6, step 7 is not necessary.
7. Keep vehicle idling for 10 minutes, then check the voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position with "OD" OFF (A/T), 4th gear position (M/T). The voltage should be above 0.70V at least once during this procedure.
8. If NG, go to EC-255, "Diagnostic Procedure" .

[QG18DE]
A EC
C
PBIB1197E
D E F G H I J K L M

Revision: December 2006

EC-253

2006 Sentra

Wiring Diagram

DTC P0137 HO2S2

[QG18DE]
UBS00BCI

Revision: December 2006

EC-254

BBWA1427E
2006 Sentra

DTC P0137 HO2S2

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

[Engine is running]

C

G Engine speed: Below 3,600 rpm after the

following conditions are met.

­ Engine: After warming up

0 - 1.0V

D

­ Keeping the engine speed between 3,500

25 W/B

Heated oxygen sensor 2 heater

and 4,000 rpm for 1 minute and at idle for 1 minute under on load

E
[Ignition switch: ON]

G Engine stopped.

BATTERY VOLTAGE

[Engine is running]

(11 - 14V)

F

G Engine speed: Above 3,600 rpm.

[Engine is running]

G Revving engine from idle up to 3,000 rpm

G

quickly after the following conditions are

met.

74 R/L

Heated oxygen sensor 2

0 - Approximately 1.0V

­ Engine: After warming up

­ Keeping the engine speed between 3,500

H

and 4,000 rpm for 1 minute and at idle for 1

minute under no load.

78 B

Sensor ground (Heated oxygen sensor)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

I
J
UBS00BCJ

K 1. Turn ignition switch OFF.

2. Loosen and retighten two ground screws on the body.

Refer to EC-151, "Ground Inspection" .

L

M

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

BBIA0515E

Revision: December 2006

EC-255

2006 Sentra

DTC P0137 HO2S2
2. CLEAR THE SELF-LEARNING DATA
With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode
with CONSULT-II. 3. Clear the self-learning control coefficient by touching "CLEAR". 4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 detected? Is it difficult to start engine?

[QG18DE]

SEF215Z

Without CONSULT-II

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF.

3. Disconnect mass air flow sensor harness connector, and restart and run engine for at least 5 seconds at idle speed.

4. Stop engine and reconnect mass air flow sensor harness connector.

5. Make sure that DTC P0102 is displayed.

6. Erase the DTC memory. Refer to EC-63, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" .

7. Make sure that DTC P0000 is displayed.

8. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0171 detected? Is it difficult to start engine?

BBIA0516E

Yes or No

Yes >> Perform trouble diagnosis for DTC P0171. Refer to EC-277, "DTC P0171 FUEL INJECTION SYSTEM FUNCTION" .
No >> GO TO 3.

3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 2 harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between ECM terminal 78 and HO2S2
terminal 4. Refer to Wiring Diagram.
Continuity should exist.
5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power
in harness or connectors.

BBIA0175E

Revision: December 2006

EC-256

2006 Sentra

DTC P0137 HO2S2
4. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 74 and HO2S2 terminal 1. Refer to Wiring Diagram.
Continuity should exist. 2. Check harness continuity between ECM terminal 74 or HO2S2 terminal 1 and ground.
Refer to Wiring Diagram.
Continuity should not exist. 3. Also check harness for short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK HEATED OXYGEN SENSOR 2
Refer to EC-257, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> Replace heated oxygen sensor 2.
6. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

[QG18DE]
A EC
C D E F G H

>> INSPECTION END
Component Inspection
HEATED OXYGEN SENSOR 2

I
UBS00BCK

With CONSULT-II

J

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. K

4. Let engine idle 1 minute.

5. Select "FUEL INJECTION" in "ACTIVE TEST" mode, and select

"HO2S2 (B1)" as the monitor item with CONSULT-II.

L

M

PBIB1782E

Revision: December 2006

EC-257

2006 Sentra

DTC P0137 HO2S2
6. Check "HO2S2 (B1)" at idle speed when adjusting "FUEL INJECTION" to ±25%.

[QG18DE]

PBIB1210E
"HO2S2 (B1)" should be above 0.70V at least once when the "FUEL INJECTION" is +25%. "HO2S2 (B1)" should be below 0.18V at least once when the "FUEL INJECTION" is -25%.
CAUTION: G Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
G Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

Without CONSULT-II

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4. Let engine idle for 1 minute.

5. Set voltmeter probes between ECM terminal 74 (HO2S2 signal) and ground.

6. Check the voltage when revving up to 4,000 rpm under no load at least 10 times. (Depress and release accelerator pedal as soon as possible.) The voltage should be above 0.70V at least once during this procedure. If the voltage is above 0.70V at step 6, step 7 is not necessary.

7. Keep vehicle idling for 10 minutes, then check voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position with "OD" OFF (A/T), 4th position (M/T). The voltage should be below 0.18V at least once during this procedure.

PBIB1197E

8. If NG, replace heated oxygen sensor 2.

CAUTION: G Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.

G Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

Removal and Installation
HEATED OXYGEN SENSOR 2
Refer to EX-3, "EXHAUST SYSTEM" .

UBS00BCL

Revision: December 2006

EC-258

2006 Sentra

DTC P0138 HO2S2
DTC P0138 HO2S2
Component Description
The heated oxygen sensor 2, after three way catalyst (manifold), monitors the oxygen level in the exhaust gas. Even if switching characteristics of the air fuel ratio (A/F) sensor 1 are shifted, the air-fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2. This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 2 is not used for engine control operation.

[QG18DE]
PFP:226A0
A
UBS00B5N
EC
C
D

CONSULT-II Reference Value in Data Monitor Mode

SEF327R
E
UBS00B5O

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

F

HO2S2 (B1) HO2S2 MNTR (B1)

G Revving engine from idle to 3,000 rpm quickly after the follow- 0 - 0.3V  0.6 - 1.0V ing conditions are met.

­ Engine: After warming up

G

­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 LEAN  RICH

minute and at idle for 1 minute under no load

On Board Diagnosis Logic
MALFUNCTION A
The heated oxygen sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen storage capacity before the three way catalyst (manifold) causes the longer switching time. To judge the malfunctions of heated oxygen sensor 2, ECM monitors whether the voltage is too high during the various driving condition such as fuel-cut.

H
UBS00B5P
I
J

K

MALFUNCTION B
The heated oxygen sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen storage capacity of the three way catalyst causes the longer switching time. To judge the malfunctions of heated oxygen sensor 2, ECM monitors whether the minimum voltage of sensor is sufficiently low during the various driving condition such as fuel-cut.

PBIB1848E

L

M

PBIB2376E

Revision: December 2006

EC-259

2006 Sentra

DTC P0138 HO2S2

[QG18DE]

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0138 0138

Heated oxygen sensor 2 circuit high voltage

A)

An excessively high voltage from the sensor is sent to ECM.

G Harness or connectors (The sensor circuit is open or shorted)
G Heated oxygen sensor 2

G Harness or connectors

(The sensor circuit is open or shorted)

B)

The minimum voltage from the sensor is not reached to the specified voltage.

G Heated oxygen sensor 2

G Fuel pressure

G Fuel injector

DTC Confirmation Procedure

UBS00B5Q

Perform PROCEDURE FOR MALFUNCTION A first. If DTC can not be confirmed, perform PROCEDURE FOR MALFUNCTION B.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

PROCEDURE FOR MALFUNCTION A With CONSULT-II
1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II. 2. Start engine and warm it up to the normal operating temperature. 3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 2 minutes.
6. If 1st trip DTC is detected, go to EC-263, "Diagnostic Procedure" .

SEF174Y

With GST Follow the procedure "With CONSULT-II" above.

PROCEDURE FOR MALFUCNTION B

With CONSULT-II

TESTING CONDITION: For the best results, perform "DTC WORK SUPPORT" at a temperature of 0 to 30°C (32 to 86°F).

1. Turn ignition switch ON and select "DATA MONITOR " mode with CONSULT-II

2. Start engine and warm it up to the normal operating temperature.

3. Turn ignition switch OFF and wait at least 10 seconds.

4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

5. Let engine idle for 1 minute.

6. Make sure that "COOLAN TEMP/S" indicates more than 70°C (158°F). If not, warm up engine and go to next step when "COOLAN TEMP/S" indication reaches to 70°C (158°F).

SEF174Y

7. Open engine hood.

8. Select "HO2S2 (B1) P1146" of "HO2S2" in "DTC WORK SUPPORT" mode with CONSULT-II.

Revision: December 2006

EC-260

2006 Sentra

DTC P0138 HO2S2
9. Start engine and follow the instruction of COSULT-II.

[QG18DE]
A

EC

C

NOTE: It will take at most 10 minutes until "COMPLETED" is displayed.
10. Make sure that "OK" is displayed after touching "SELF-DIAG RESULTS". If "NG" is displayed, refer to EC-263, "Diagnostic Procedure" . If "CAN NOT BE DIAGNOSED" is displayed, perform the following.
a. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
b. Return to step 1.

PBIB2372E

D

E

F

Overall Function Check

UBS00BC8

G

Use this procedure to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st

trip DTC might not be confirmed.

PROCEDURE FOR MALFUCNTION B

H

With GST

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

I

3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4. Let engine idle 1 minute.

J

5. Set voltmeter probes between ECM terminal 74 (HO2S2 signal) and ground.

6. Check the voltage when revving up to 4,000 rpm under no load

at least 10 times. (Depress and release accelerator pedal as soon as possible.)

K

The voltage should be below 0.18V at least once during this

procedure.

If the voltage can be confirmed in step 6, step 7 is not nec-

L

essary.

7. Keep vehicle at idling for 10 minutes, then check the voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position with "OD" OFF (A/T), 4th gear position (M/T). The voltage should be below 0.18V at least once during this procedure.

M
PBIB1197E

8. If NG, go to EC-263, "Diagnostic Procedure" .

Revision: December 2006

EC-261

2006 Sentra

Wiring Diagram

DTC P0138 HO2S2

[QG18DE]
UBS00B5R

Revision: December 2006

EC-262

BBWA1427E
2006 Sentra

DTC P0138 HO2S2

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

[Engine is running]

C

G Engine speed: Below 3,600 rpm after the

following conditions are met.

­ Engine: After warming up

0 - 1.0V

D

­ Keeping the engine speed between 3,500

25 W/B

Heated oxygen sensor 2 heater

and 4,000 rpm for 1 minute and at idle for 1 minute under on load

E
[Ignition switch: ON]

G Engine stopped.

BATTERY VOLTAGE

[Engine is running]

(11 - 14V)

F

G Engine speed: Above 3,600 rpm.

[Engine is running]

G Revving engine from idle up to 3,000 rpm

G

quickly after the following conditions are

met.

74 R/L

Heated oxygen sensor 2

0 - Approximately 1.0V

­ Engine: After warming up

­ Keeping the engine speed between 3,500

H

and 4,000 rpm for 1 minute and at idle for 1

minute under no load.

78 B

Sensor ground (Heated oxygen sensor)

[Engine is running] G Warm-up condition G Idle speed

Diagnostic Procedure
PROCEDURE FOR MALFUCNTION A

Approximately 0V

I
J
UBS00B5S

1. CHECK GROUND CONNECTIONS

K

1. Turn ignition switch OFF.

2. Loosen and retighten two ground screws on the body. Refer to EC-151 .

L

M

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

BBIA0515E

Revision: December 2006

EC-263

2006 Sentra

DTC P0138 HO2S2
2. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 2 harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between ECM terminal 78 and HO2S2
terminal 4. Refer to Wiring Diagram.
Continuity should exist. 5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
3. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 74 and HO2S2 terminal 1. Refer to Wiring Diagram.
Continuity should exist. 2. Check harness continuity between ECM terminal 74 or HO2S2 terminal 1 and ground.
Refer to Wiring Diagram.
Continuity should not exist. 3. Also check harness for short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK HARNESS CONNECTOR
Check HO2S2 harness connector for water. Water should not exist.
OK or NG OK >> GO TO 5. NG >> Repair or replace harness connector.
5. CHECK HEATED OXYGEN SENSOR 2
Refer to EC-266, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> Replace heated oxygen sensor 2.
6. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

[QG18DE]
BBIA0175E

>> INSPECTION END

Revision: December 2006

EC-264

2006 Sentra

DTC P0138 HO2S2
PROCEDURE FOR MALFUCNTION B
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body.
Refer to EC-151, "Ground Inspection" .

[QG18DE]
A EC
C

D

E

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. CLEAR THE SELF-LEARNING DATA
With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode
with CONSULT-II. 3. Clear the self-learning control coefficient by touching "CLEAR". 4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 detected? Is it difficult to start engine?

BBIA0515E
F G H
I J

K

Without CONSULT-II

SEF215Z
L

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF.

M

3. Disconnect mass air flow sensor harness connector, and restart and run engine for at least 5 seconds at idle speed.

4. Stop engine and reconnect mass air flow sensor harness connector.

5. Make sure that DTC P0102 is displayed.

6. Erase the DTC memory. Refer to EC-63, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" .

7. Make sure that DTC P0000 is displayed.

8. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0172 detected? Is it difficult to start engine?

BBIA0516E

Yes or No

Yes >> Perform trouble diagnosis for DTC P0172. Refer toEC-285, "DTC P0172 FUEL INJECTION SYSTEM FUNCTION" .
No >> GO TO 3.

Revision: December 2006

EC-265

2006 Sentra

DTC P0138 HO2S2
3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 2 harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between ECM terminal 78 and HO2S2
terminal 4. Refer to Wiring Diagram.
Continuity should exist. 5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
4. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 74 and HO2S2 terminal 1. Refer to Wiring Diagram.
Continuity should exist. 2. Check harness continuity between ECM terminal 74 or HO2S2 terminal 1 and ground.
Refer to Wiring Diagram.
Continuity should not exist. 3. Also check harness for short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK HEATED OXYGEN SENSOR 2
Refer toEC-266, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> Replace heated oxygen sensor 2.
6. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

[QG18DE]
BBIA0175E

>> INSPECTION END

Component Inspection
HEATED OXYGEN SENSOR 2

UBS00B5T

With CONSULT-II

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4. Let engine idle for 1 minute.

Revision: December 2006

EC-266

2006 Sentra

DTC P0138 HO2S2
5. Select "FUEL INJECTION" in "ACTIVE TEST" mode, and select "HO2S2 (B1)" as the monitor item with CONSULT-II.

[QG18DE]
A

EC

6. Check "HO2S2 (B1)" at idle speed when adjusting "FUEL INJECTION" to ±25%.

C
PBIB1782E
D
E

F

G

PBIB1210E

"HO2S2 (B1)" should be above 0.70V at least once when the "FUEL INJECTION" is +25%.

H

"HO2S2 (B1)" should be below 0.18V at least once when the "FUEL INJECTION" is -25%.

7. If NG, replace heated oxygen sensor 2.

CAUTION:

I

G Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7

in) onto a hard surface such as a concrete floor; use a new one.

G Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread J Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

Without CONSULT-II

1. Start engine and warm it up to the normal operating temperature.

K

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Start engine and keep the engine speed at between 3,500 to 4,000 rpm for at least 1 minute under no

load.

L

4. Let engine idle for 1 minute.

5. Set voltmeter probes between ECM terminal 74 (HO2S2 signal) and ground.

6. Check the voltage when revving up to 4,000 rpm under no load

M

at least 10 times.

(Depress and release accelerator pedal as soon as possible.)

The voltage should be above 0.70V at least once during this

procedure.

If the voltage is above 0.70V at step 6, step 7 is not neces-

sary.

7. Keep vehicle idling for 10 minutes, then check voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position with "OD" OFF (A/T), 4th gear position (M/T). The voltage should be below 0.18V at least once during this procedure.

PBIB1197E

8. If NG, replace heated oxygen sensor 2.

CAUTION: G Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.

Revision: December 2006

EC-267

2006 Sentra

DTC P0138 HO2S2

[QG18DE]

G Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

Removal and Installation
HEATED OXYGEN SENSOR 2
Refer to EX-3, "EXHAUST SYSTEM" .

UBS00B5U

Revision: December 2006

EC-268

2006 Sentra

DTC P0139 HO2S2
DTC P0139 HO2S2
Component Description
The heated oxygen sensor 2, after three way catalyst (manifold), monitors the oxygen level in the exhaust gas. Even if switching characteristics of the air fuel ratio (A/F) sensor 1 are shifted, the air-fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2. This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 2 is not used for engine control operation.

[QG18DE]
PFP:226A0
A
UBS00B5V
EC
C
D

CONSULT-II Reference Value in Data Monitor Mode

SEF327R
E
UBS00B5W

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

F

HO2S2 (B1) HO2S2 MNTR (B1)

G Revving engine from idle to 3,000 rpm quickly after the follow- 0 - 0.3V  0.6 - 1.0V ing conditions are met.

­ Engine: After warming up

G

­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 LEAN  RICH

minute and at idle for 1 minute under no load

On Board Diagnosis Logic

H
UBS00B5X

The heated oxygen sensor 2 has a much longer switching time

between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen storage capacity before the three way catalyst (manifold) causes

I

the longer switching time. To judge the malfunctions of heated oxy-

gen sensor 2, ECM monitors whether the switching response of the

sensor's voltage is faster than specified during the various driving

J

condition such as fuel-cut.

K

SEF302U
L

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

G Harness or connectors

M

(The sensor circuit is open or shorted.)

P0139 0139

Heated oxygen sensor 2 circuit slow response

It takes more time for the sensor to respond

G Heated oxygen sensor 2

between rich and lean than the specified time. G Fuel pressure

G Fuel injector

G Intake air leaks

Revision: December 2006

EC-269

2006 Sentra

DTC P0139 HO2S2

[QG18DE]

DTC Confirmation Procedure

UBS00B5Y

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II

For the best results, perform "DTC WORK SUPPORT" at a temperature of 0 to 30°C (32 to 86°F)

1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.

2. Start engine and warm it up to the normal operating temperature.

3. Turn ignition switch OFF and wait at least 10 seconds.

4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

5. Let engine idle for 1 minute.

6. Make sure that "COOLANTEMP/S" indications more than 70°C (158°F). If not, warm up engine and go to next step when "COOLANTEMP/S" indication reaches to 70°C (158°F).

SEF174Y

7. Open engine hood.

8. Select "HO2S2 (B1) P0139" of "HO2S2" in "DTC WORK SUPPORT" mode with CONSULT-II.

9. Start engine and following the instruction of CONSULT-II.

NOTE: It will take at most 10 minutes until "COMPLETED" is displayed.
10. Make sure that OK is displayed after touching "SELF-DIAG RESULTS". If NG is displayed, refer to EC-273, "Diagnostic Procedure" . If "CAN NOT BE DIAGNOSED" is displayed, perform the following.
a. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
b. Return to step 1.

PBIB2374E

Overall Function Check

UBS00B5Z

Use this procedure to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st trip DTC might not be confirmed.

WITH GST 1. Start engine and warm it up to the normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. 4. Let engine idle for 1 minute. 5. Set voltmeter probes between ECM terminal 74 (HO2S2 signal) and ground.

Revision: December 2006

EC-270

2006 Sentra

DTC P0139 HO2S2
6. Check the voltage when revving up to 4,000 rpm under no load at least 10 times. (Depress and release accelerator pedal as soon as possible.) A change of voltage should be more than 0.06V for 1 second during this procedure. If the voltage can be confirmed in step 6, step 7 is not necessary.
7. Keep vehicle at idling for 10 minutes, then check the voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position with "OD" OFF (A/T), 4th gear position (M/T). A change of voltage should be more than 0.06V for 1 second during this procedure.
8. If NG, go to EC-273, "Diagnostic Procedure" .

[QG18DE]
A EC
C
PBIB1197E
D E F G H I J K L M

Revision: December 2006

EC-271

2006 Sentra

Wiring Diagram

DTC P0139 HO2S2

[QG18DE]
UBS00B60

Revision: December 2006

EC-272

BBWA1427E
2006 Sentra

DTC P0139 HO2S2

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

[Engine is running]

C

G Engine speed: Below 3,600 rpm after the

following conditions are met.

­ Engine: After warming up

0 - 1.0V

D

­ Keeping the engine speed between 3,500

25 W/B

Heated oxygen sensor 2 heater

and 4,000 rpm for 1 minute and at idle for 1 minute under on load

E
[Ignition switch: ON]

G Engine stopped.

BATTERY VOLTAGE

[Engine is running]

(11 - 14V)

F

G Engine speed: Above 3,600 rpm.

[Engine is running]

G Revving engine from idle up to 3,000 rpm

G

quickly after the following conditions are

met.

74 R/L

Heated oxygen sensor 2

0 - Approximately 1.0V

­ Engine: After warming up

­ Keeping the engine speed between 3,500

H

and 4,000 rpm for 1 minute and at idle for 1

minute under no load.

78 B

Sensor ground (Heated oxygen sensor)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

I
J
UBS00B61

K 1. Turn ignition switch OFF.

2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

L

M

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

BBIA0515E

Revision: December 2006

EC-273

2006 Sentra

DTC P0139 HO2S2
2. CLEAR THE SELF-LEARNING DATA
With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode
with CONSULT-II. 3. Clear the self-learning control coefficient by touching "CLEAR". 4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?

[QG18DE]

SEF215Z

Without CONSULT-II

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF.

3. Disconnect mass air flow sensor harness connector, and restart and run engine for at least 5 seconds at idle speed.

4. Stop engine and reconnect mass air flow sensor harness connector.

5. Make sure that DTC P0102 is displayed.

6. Erase the DTC memory. Refer to EC-63, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" .

7. Make sure that DTC P0000 is displayed.

8. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?

BBIA0516E

Yes or No

Yes >> Perform trouble diagnosis for DTC P0171 or P0172. Refer to EC-277, "DTC P0171 FUEL INJECTION SYSTEM FUNCTION" or EC-285, "DTC P0172 FUEL INJECTION SYSTEM FUNCTION" .
No >> GO TO 3.

3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 2 harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between ECM terminal 78 and HO2S2
terminal 4. Refer to Wiring Diagram.
Continuity should exist.
5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power
in harness or connectors.

BBIA0175E

Revision: December 2006

EC-274

2006 Sentra

DTC P0139 HO2S2
4. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 74 and HO2S2 terminal 1. Refer to Wiring Diagram.
Continuity should exist. 2. Check harness continuity between ECM terminal 74 or HO2S2 terminal 1 and ground.
Refer to Wiring Diagram.
Continuity should not exist. 3. Also check harness for short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK HEATED OXYGEN SENSOR 2
Refer to EC-275, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> Replace heated oxygen sensor 2.
6. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

[QG18DE]
A EC
C D E F G H

>> INSPECTION END
Component Inspection
HEATED OXYGEN SENSOR 2

I
UBS00B62

With CONSULT-II

J

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. K

4. Let engine idle for 1 minute.

5. Select "FUEL INJECTION" in "ACTIVE TEST" mode, and select

"HO2S2 (B1)" as the monitor item with CONSULT-II.

L

M

PBIB1782E

Revision: December 2006

EC-275

2006 Sentra

DTC P0139 HO2S2
6. Check "HO2S2 (B1)" at idle speed when adjusting "FUEL INJECTION" to ±25%.

[QG18DE]

PBIB1210E
"HO2S2 (B1)" should be above 0.70V at least once when the "FUEL INJECTION" is +25%. "HO2S2 (B1)" should be below 0.18V at least once when the "FUEL INJECTION" is -25%.
CAUTION: G Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
G Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

Without CONSULT-II

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4. Let engine idle for 1 minute.

5. Set voltmeter probes between ECM terminal 74 (HO2S2 signal) and ground.

6. Check the voltage when revving up to 4,000 rpm under no load at least 10 times. (Depress and release accelerator pedal as soon as possible.) The voltage should be above 0.70V at least once during this procedure. If the voltage is above 0.70V at step 6, step 7 is not necessary.

7. Keep vehicle idling for 10 minutes, then check voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position with "OD" OFF (A/T), 4th gear position (M/T). The voltage should be below 0.18V at least once during this procedure.

PBIB1197E

8. If NG, replace heated oxygen sensor 2.

CAUTION: G Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.

G Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

Removal and Installation
HEATED OXYGEN SENSOR 2
Refer toEX-3, "EXHAUST SYSTEM" .

UBS00B63

Revision: December 2006

EC-276

2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION

[QG18DE]

DTC P0171 FUEL INJECTION SYSTEM FUNCTION On Board Diagnosis Logic

PFP:16600
A
UBS00B64

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the air fuel ratio (A/F) sensor 1. The EC ECM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic). C

Sensor Air fuel ratio (A/F) sensor 1

Input Signal to ECM

ECM function

Actuator

D

Density of oxygen in exhaust gas (Mixture ratio feedback signal)

Fuel injection control

Fuel injector

DTC No.

Trouble diagnosis
name

DTC detecting condition

E
Possible Cause

G Intake air leaks

F

G Air fuel ratio (A/F) sensor 1

G Fuel injector

P0171 0171

Fuel injection system too learn

G Fuel injection system does not operate properly.
G The amount of mixture ratio compensation is too large. (The mixture ratio is too lean.)

G Exhaust gas leaks G Incorrect fuel pressure

G

G Lack of fuel

G Mass air flow sensor

H

G Incorrect PCV hose connection

DTC Confirmation Procedure

UBS00B65

I

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

J

WITH CONSULT-II

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

K

3. Turn ignition switch ON and select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CON-

SULT-II.

4. Clear the self-learning control coefficient by touching "CLEAR".

L

5. Select "DATA MONITOR" mode with CONSULT-II.

6. Start engine again and let it idle for at least 10 minutes.

The 1st trip DTC P0171 should be detected at this stage, if a

M

malfunction exists. If so, go to EC-281, "Diagnostic Procedure" .

NOTE: If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.

a. Turn ignition switch OFF and wait at least 10 seconds.

b. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for 10 minutes. Refer to the table below. Hold the accelerator pedal as steady as possible.

SEF215Z

The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following conditions should be satisfied at the same time.

Engine speed Vehicle speed

Engine speed in the freeze frame data ± 400 rpm Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)

Revision: December 2006

EC-277

2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION

[QG18DE]

Engine coolant temperature (T) condition

When the freeze frame data shows lower than 70 °C (158 °F), T should be lower than 70 °C (158 °F).
When the freeze frame data shows higher than or equal to 70 °C (158 °F), T should be higher than or equal to 70 °C (158 °F).

7. If it is difficult to start engine at step 6, the fuel injection system has a malfunction.
8. Crank engine while depressing accelerator pedal. If engine starts, go to EC-281, "Diagnostic Procedure" . If engine does not start, check exhaust gas and intake air leak visually.

WITH GST

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Disconnect mass air flow sensor harness connector. Then restart and run engine for at least 5 seconds at idle speed.

4. Stop engine and reconnect mass air flow sensor harness connector.

5. Select "Service $03" with GST. Make sure DTC P0102 is detected.

6. Select "Service $04" with GST and erase the DTC P0102.

7. Start engine again and run it for at least 10 minutes at idle speed.

BBIA0516E

8. Select "Service $07" with GST. The 1st trip DTC P0171 should be detected at this stage, if a malfunction exists. If so, go to EC-281, "Diagnostic Procedure" .

NOTE: If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.

a. Turn ignition switch OFF and wait at least 10 seconds.

b. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for 10 minutes. Refer to the table below. Hold the accelerator pedal as steady as possible.

The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following conditions should be satisfied at the same time.

Engine speed

Engine speed in the freeze frame data ± 400 rpm

Vehicle speed

Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)

Engine coolant temperature (T) condition

When the freeze frame data shows lower than 70 °C (158 °F), T should be lower than 70 °C (158 °F).
When the freeze frame data shows higher than or equal to 70 °C (158 °F), T should be higher than or equal to 70 °C (158 °F).

9. If it is difficult to start engine at step 7, the fuel injection system has a malfunction.
10. Crank engine while depressing accelerator pedal. If engine starts, go to EC-281, "Diagnostic Procedure" . If engine does not start, check exhaust gas and intake air leak visually.

Revision: December 2006

EC-278

2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION Wiring Diagram

[QG18DE]
UBS00B66
A EC
C D E F G H I J K L M

Revision: December 2006

EC-279

BBWA2172E
2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION

[QG18DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

22 G/B 23 R/B 41 L/B 42 Y/B

Fuel injector No. 3 Fuel injector No. 1 Fuel injector No. 4 Fuel injector No. 2

[Engine is running] G Warm-up condition G Idle speed
[Engine is running] G Warm-up condition G Idle speed
NOTE: The pulse cycle changes depending on rpm at idle.
[Engine is running] G Warm-up condition G Engine speed: 2,000 rpm

Approximately 3.1V Approximately 2.6V 2 - 3V 2 - 3V BATTERY VOLTAGE (11 - 14V)

PBIB1584E

BATTERY VOLTAGE (11 - 14V)

PBIB0529E

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

PBIB0530E

Revision: December 2006

EC-280

2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION
Diagnostic Procedure
1. CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle. 2. Listen for an exhaust gas leak before three way catalyst (manifold).

[QG18DE]
UBS00B67
A
EC

C

D

OK or NG OK >> GO TO 2. NG >> Repair or replace.
2. CHECK FOR INTAKE AIR LEAK AND PCV HOSE

1. Listen for an intake air leak after the mass air flow sensor. 2. Check PCV hose connection. OK or NG
OK >> GO TO 3. NG >> Repair or replace.
3. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. Disconnect ECM harness connector.
4. Check harness continuity between ECM terminals and A/F sensor 1 terminals as follows. Refer to Wiring Diagram.

ECM terminal 16 35 56 75

A/F sensor 1 1 5 6 2

E
PBIB1216E
F G H I J K L M
BBIA0140E

Continuity should exist.
5. Check harness continuity between ECM terminals 16, 35, 56, 75 and ground, or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to Wiring Diagram.
Continuity should not exist.
6. Also check harness for short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-281

2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION
4. CHECK FUEL PRESSURE

[QG18DE]

1. Release fuel pressure to zero. Refer to EC-82, "FUEL PRESSURE RELEASE" .
2. Install fuel pressure gauge and check fuel pressure. Refer to EC-83, "FUEL PRESSURE CHECK" .

At idling: 350 kPa (3.57 kg/cm2 , 51 psi)
OK or NG OK >> GO TO 6. NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART

Check the following. G Fuel pump and circuit. Refer to EC-579, "FUEL PUMP" . G Fuel pressure regulator G Fuel lines. G Fuel filter for clogging

>> Repair or replace.
6. CHECK MASS AIR FLOW SENSOR

With CONSULT-II 1. Install all removed parts. 2. Check "MASS AIR FLOW" in "DATA MONITOR" mode with CONSULT-II.

at idling:

1.4 - 4.0 g·m/sec

at 2,500 rpm: 5.0 - 10.0 g·m/sec

With GST 1. Install all removed parts. 2. Check mass air flow sensor signal in Service $01 with GST.

at idling:

1.4 - 4.0 g·m/sec

at 2,500 rpm: 5.0 - 10.0 g·m/sec

OK or NG
OK >> GO TO 7. NG >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
ground. Refer to EC-177, "DTC P0101 MAF SENSOR" .

Revision: December 2006

EC-282

2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION
7. CHECK FUNCTION OF FUEL INJECTOR
With CONSULT-II 1. Start engine. 2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with
CONSULT-II. 3. Make sure that each circuit produces a momentary engine
speed drop.

[QG18DE]
A EC
C D

Without CONSULT-II 1. Start engine. 2. Listen to each fuel injector operating sound.
Clicking noise should be heard.

E
PBIB0133E
F
G
H

I

PBIB1986E
J

OK or NG

OK >> GO TO 8.

NG >> Perform trouble diagnosis for FUEL INJECTOR EC-573, "FUEL INJECTOR" .

K

8. REMOVE FUEL INJECTOR

1. Confirm that the engine is cooled down and there are no fire hazards near the vehicle.

L

2. Turn ignition switch OFF.

3. Remove fuel injector with fuel tube assembly. Refer to EM-21, "FUEL INJECTOR AND FUEL TUBE" .

M

Keep fuel hose and all fuel injectors connected to fuel tube. The fuel injector harness connectors should

remain connected.

>> GO TO 9.

Revision: December 2006

EC-283

2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION
9. CHECK FUEL INJECTOR
1. Disconnect all ignition coil harness connectors. 2. Place pans or saucers under each fuel injector. 3. Crank engine for about 3 seconds. Make sure that fuel sprays
out from fuel injectors. Fuel should be sprayed evenly for each cylinder.
OK or NG OK >> GO TO 10. NG >> Replace fuel injectors from which fuel does not spray out. Always replace O-ring with new one.
10. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END

[QG18DE]
PBIB1726E

Revision: December 2006

EC-284

2006 Sentra

DTC P0172 FUEL INJECTION SYSTEM FUNCTION

[QG18DE]

DTC P0172 FUEL INJECTION SYSTEM FUNCTION On Board Diagnosis Logic

PFP:16600
A
UBS00B68

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the air fuel ratio (A/F) sensor 1. The EC ECM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (The actual mixture ratio is too rich.), the ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic). C

Sensor Air fuel ratio (A/F) sensor 1

Input Signal to ECM

ECM function

Actuator

D

Density of oxygen in exhaust gas (Mixture ratio feedback signal)

Fuel injection control

Fuel injector

DTC No.

Trouble diagnosis name

DTC detecting condition

E
Possible Cause

G Air fuel ratio (A/F) sensor 1

P0172 0172

Fuel injection system too rich

G Fuel injection system does not operate properly.
G The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.)

G Fuel injector G Exhaust gas leaks G Incorrect fuel pressure

F

G Mass air flow sensor

G

DTC Confirmation Procedure

UBS00B69

NOTE:

H

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

WITH CONSULT-II

I

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds. 3. Turn ignition switch ON and select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CON- J
SULT-II.

4. Clear the self-learning control coefficient by touching "CLEAR"

or "START".

K

5. Select "DATA MONITOR" mode with CONSULT-II.

6. Start engine again and let it idle for at least 10 minutes. The 1st trip DTC P0172 should be detected at this stage, if a

L

malfunction exists. If so, go to EC-289, "Diagnostic Procedure" .

NOTE:

If 1st trip DTC is not detected during above procedure, perform-

M

ing the following procedure is advised.

a. Turn ignition switch OFF and wait at least 10 seconds.
b. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for 10 minutes. Refer to the table below. Hold the accelerator pedal as steady as possible.

SEF215Z

The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following conditions should be satisfied at the same time.

Engine speed Vehicle speed
Engine coolant temperature (T) condition

Engine speed in the freeze frame data ± 400 rpm
Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)
When the freeze frame data shows lower than 70 °C (158 °F), T should be lower than 70 °C (158 °F).
When the freeze frame data shows higher than or equal to 70 °C (158 °F), T should be higher than or equal to 70 °C (158 °F).

Revision: December 2006

EC-285

2006 Sentra

DTC P0172 FUEL INJECTION SYSTEM FUNCTION

[QG18DE]

7. If it is difficult to start engine at step 6, the fuel injection system has a malfunction.
8. Crank engine while depressing accelerator pedal. If engine starts, go to EC-289, "Diagnostic Procedure" . If engine does not start, remove ignition plugs and check for fouling, etc.

WITH GST

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Disconnect mass air flow sensor harness connector. Then restart and run engine for at least 5 seconds at idle speed.

4. Stop engine and reconnect mass air flow sensor harness connector.

5. Select Service $03 with GST. Make sure DTC P0102 is detected.

6. Select Service $04 with GST and erase the DTC P0102.

7. Start engine again and run it for at least 10 minutes at idle speed.

BBIA0150E

8. Select Service $07 with GST. The 1st trip DTC P0172 should be detected at this stage, if a malfunction exists. If so, go to EC-289, "Diagnostic Procedure" .

NOTE: If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.

a. Turn ignition switch OFF and wait at least 10 seconds.

b. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for 10 minutes. Refer to the table below. Hold the accelerator pedal as steady as possible.

The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following conditions should be satisfied at the same time.

Engine speed

Engine speed in the freeze frame data ± 400 rpm

Vehicle speed

Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)

Engine coolant temperature (T) condition

When the freeze frame data shows lower than 70 °C (158 °F), T should be lower than 70 °C (158 °F).
When the freeze frame data shows higher than or equal to 70 °C (158 °F), T should be higher than or equal to 70 °C (158 °F).

9. If it is difficult to start engine at step 7, the fuel injection system has a malfunction.

10. Crank engine while depressing accelerator pedal. If engine starts, go to EC-289, "Diagnostic Procedure" . If engine does not start, remove ignition plugs and check for fouling, etc.

Revision: December 2006

EC-286

2006 Sentra

DTC P0172 FUEL INJECTION SYSTEM FUNCTION Wiring Diagram

[QG18DE]
UBS00B6A
A EC
C D E F G H I J K L M

Revision: December 2006

EC-287

BBWA2172E
2006 Sentra

DTC P0172 FUEL INJECTION SYSTEM FUNCTION

[QG18DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

22 G/B 23 R/B 41 L/B 42 Y/B

Fuel injector No. 3 Fuel injector No. 1 Fuel injector No. 4 Fuel injector No. 2

[Engine is running] G Warm-up condition G Idle speed
[Engine is running] G Warm-up condition G Idle speed
NOTE: The pulse cycle changes depending on rpm at idle.
[Engine is running] G Warm-up condition G Engine speed: 2,000 rpm

Approximately 3.1V Approximately 2.6V 2 - 3V 2 - 3V BATTERY VOLTAGE (11 - 14V)

PBIB1584E

BATTERY VOLTAGE (11 - 14V)

PBIB0529E

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

PBIB0530E

Revision: December 2006

EC-288

2006 Sentra

DTC P0172 FUEL INJECTION SYSTEM FUNCTION
Diagnostic Procedure
1. CHECK FOR EXHAUST GAS LEAK
1. Start engine and run it at idle. 2. Listen for an exhaust gas leak before three way catalyst (manifold).

[QG18DE]
UBS00B6B
A
EC

C

D

OK or NG OK >> GO TO 2. NG >> Repair or replace.
2. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector and ECM harness connector.
3. Check harness continuity between ECM terminals and A/F sensor 1 terminals as follows. Refer to Wiring Diagram.

ECM terminal 16 35 56 75

A/F sensor 1 terminal 1 5 6 2

E
PBIB1216E
F

G H

I

J

BBIA0140E

K

Continuity should exist.

L

4. Check harness continuity between ECM terminals 16, 35, 56, 75 and ground, or A/F sensor 1 terminals 1,

2, 5, 6 and ground.

Refer to Wiring Diagram.

M

Continuity should not exist.

5. Also check harness for short to power. OK or NG
OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

3. CHECK FUEL PRESSURE

1. Release fuel pressure to zero. Refer to EC-82, "FUEL PRESSURE RELEASE" .
2. Install fuel pressure gauge and check fuel pressure. Refer to EC-83, "FUEL PRESSURE CHECK" .

At idling: Approximately 350 kPa (3.57 kg/cm2 , 51 psi)

OK or NG
OK >> GO TO 5. NG >> GO TO 4.

Revision: December 2006

EC-289

2006 Sentra

DTC P0172 FUEL INJECTION SYSTEM FUNCTION
4. DETECT MALFUNCTIONING PART
Check the following. G Fuel pump and circuit (Refer to EC-579 .) G Fuel pressure regulator (Refer to EC-83 .) OK or NG
OK >> Replace "fuel level sensor unit and fuel pump". NG >> Repair or replace.
5. CHECK MASS AIR FLOW SENSOR

[QG18DE]

With CONSULT-II 1. Install all removed parts. 2. Check "MASS AIR FLOW" in "DATA MONITOR" mode with CONSULT-II.

at idling

: 1.4 - 4.0 g·m/sec

at 2,500 rpm : 5.0 - 10.0 g·m/sec

With GST 1. Install all removed parts. 2. Check mass air flow sensor signal in Service $01 with GST.

at idling

: 1.4 - 4.0 g·m/sec

at 2,500 rpm : 5.0 - 10.0 g·m/sec

OK or NG
OK >> GO TO 6. NG >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
ground. Refer toEC-177, "DTC P0101 MAF SENSOR" .

Revision: December 2006

EC-290

2006 Sentra

DTC P0172 FUEL INJECTION SYSTEM FUNCTION
6. CHECK FUNCTION OF FUEL INJECTOR
With CONSULT-II 1. Start engine. 2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with
CONSULT-II. 3. Make sure that each circuit produces a momentary engine
speed drop.

[QG18DE]
A EC
C D

Without CONSULT-II 1. Start engine. 2. Listen to each fuel injector operating sound.
Clicking noise should be heard.

E
PBIB0133E
F
G
H

I

OK or NG OK >> GO TO 7. NG >> Perform trouble diagnosis for FUEL INJECTOR, EC-573, "FUEL INJECTOR" .
7. REMOVE FUEL INJECTOR
1. Confirm that the engine is cooled down and there are no fire hazards near the vehicle. 2. Turn ignition switch OFF. 3. Remove fuel tube assembly. Refer to EM-21, "FUEL INJECTOR AND FUEL TUBE" .
Keep fuel hose and all fuel injectors connected to fuel tube.

PBIB1986E
J
K L
M

>> GO TO 8.
8. CHECK FUEL INJECTOR
1. Disconnect fuel injector harness connectors. 2. Disconnect all ignition coil harness connectors. 3. Prepare pans or saucers under each fuel injectors. 4. Crank engine for about 3 seconds.
Make sure fuel does not drip from fuel injector. OK or NG
OK (Does not drip)>>GO TO 9. NG (Drips)>>Replace the fuel injectors from which fuel is dripping. Always replace O-ring with new one.

Revision: December 2006

EC-291

2006 Sentra

DTC P0172 FUEL INJECTION SYSTEM FUNCTION
9. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . >> INSPECTION END

[QG18DE]

Revision: December 2006

EC-292

2006 Sentra

DTC P0181 FTT SENSOR
DTC P0181 FTT SENSOR Component Description
The fuel tank temperature sensor is used to detect the fuel temperature inside the fuel tank. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the fuel temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

[QG18DE]
PFP:22630
A
UBS00B6C
EC
C

D

<Reference data>

BBIA0132E
E

Fluid temperature °C (°F)

Voltage* V

Resistance k

20 (68)

3.5

2.3 - 2.7

50 (122)

2.2

0.79 - 0.90

*: These data are reference values and are measured between ECM terminal 107 (Fuel tank temperature sensor) and ground.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may damage the ECM's transistor. Use ground other than ECM, such as ground.
On Board Diagnosis Logic

F
G
H
SEF012P
I
UBS00B6D

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

J

P0181 0181

Fuel tank temperature sensor circuit range/ performance

Rationally incorrect voltage from the sensor is sent to ECM, compared with the voltage signals from engine coolant temperature sensor and intake air temperature sensor.

G Harness or connectors (The sensor circuit is open or shorted)
G Fuel tank temperature sensor

K

DTC Confirmation Procedure

UBS00B6E

L NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

M
WITH CONSULT-II

1. Turn ignition switch ON.

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Wait at least 10 seconds. If 1st trip DTC is detected, go to EC-296, "Diagnostic Procedure" . If the result is OK, go to following step.

4. Check "COOLAN TEMP/S" signal. If the signal is less than 50°C (122°F), the result will be OK. If the signal is above 50°C (122°F), go to the following step.

5. Cool engine down until "COOLAN TEMP/S" signal is less than 50°C (122°F).

6. Wait at least 10 seconds.
7. If 1st trip DTC is detected, go to EC-296, "Diagnostic Procedure" .

SEF174Y

Revision: December 2006

EC-293

2006 Sentra

DTC P0181 FTT SENSOR
WITH GST Follow the procedure "WITH CONSULT-II" above.

[QG18DE]

Revision: December 2006

EC-294

2006 Sentra

Wiring Diagram

DTC P0181 FTT SENSOR

[QG18DE]
UBS00B6F
A EC
C D E F G H I J K L M

Revision: December 2006

EC-295

BBWA0285E
2006 Sentra

DTC P0181 FTT SENSOR
Diagnostic Procedure
1. CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect "fuel level sensor unit and fuel pump" harness con-
nector. 3. Turn ignition switch ON.

[QG18DE]
UBS00B6G

4. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 3. NG >> GO TO 2.

BBIA0132E

2. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness connectors B3, M16 G Harness for open or short between ECM and "fuel level sensor unit and fuel pump"

PBIB0932E

>> Repair harness or connector.
3. CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 5 and ground.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to power in harness or connectors.
4. CHECK FUEL TANK TEMPERATURE SENSOR
Refer to, EC-297, "Component Inspection" . OK or NG
OK >> GO TO 5. NG >> Replace "fuel level sensor unit and fuel pump".

Revision: December 2006

EC-296

2006 Sentra

DTC P0181 FTT SENSOR

5. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
FUEL TANK TEMPERATURE SENSOR Check resistance by heating with hot water or heat gun as shown in the figure.

Temperature °C (°F) 20 (68) 50 (122)

Resistance k 2.3 - 2.7
0.79 - 0.90

If NG, replace "fuel level sensor unit and fuel pump".

[QG18DE]
A
EC
UBS00B6H
C
D
E

Removal and Installation
FUEL TANK TEMPERATURE SENSOR
Refer to FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" .

F
PBIB0931E UBS00B6I
G
H

I

J

K

L

M

Revision: December 2006

EC-297

2006 Sentra

DTC P0182, P0183 FTT SENSOR
DTC P0182, P0183 FTT SENSOR Component Description
The fuel tank temperature sensor is used to detect the fuel temperature inside the fuel tank. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the fuel temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

[QG18DE]
PFP:22630
UBS00B6J

BBIA0132E

<Reference data>

Fluid temperature °C (°F)

Voltage* V

Resistance k

20 (68)

3.5

2.3 - 2.7

50 (122)

2.2

0.79 - 0.90

*: These data are reference values and are measured between ECM terminal 107 (Fuel tank temperature sensor) and ground.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may damage the ECM's transistor. Use ground other than ECM, such as ground.
On Board Diagnosis Logic

SEF012P UBS00B6K

DTC No.
P0182 0182
P0183 0183

Trouble diagnosis name
Fuel tank temperature sensor circuit low input
Fuel tank temperature sensor circuit high input

DTC detecting condition
An excessively low voltage from the sensor is sent to ECM.
An excessively high voltage from the sensor is sent to ECM.

Possible cause
G Harness or connectors (The sensor circuit is open or shorted.)
G Fuel tank temperature sensor

DTC Confirmation Procedure

UBS00B6L

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II
1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Wait at least 5 seconds. 4. If 1st trip DTC is detected, go to EC-300, "Diagnostic Procedure"
.

WITH GST Follow the procedure "WITH CONSULT-II" above.

Revision: December 2006

EC-298

SEF174Y
2006 Sentra

Wiring Diagram

DTC P0182, P0183 FTT SENSOR

[QG18DE]
UBS00B6M
A EC
C D E F G H I J K L M

Revision: December 2006

EC-299

BBWA0285E
2006 Sentra

DTC P0182, P0183 FTT SENSOR
Diagnostic Procedure
1. CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect "fuel level sensor unit and fuel pump" harness con-
nector. 3. Turn ignition switch ON.

[QG18DE]
UBS00B6N

4. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 3. NG >> GO TO 2.

BBIA0132E

2. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness connectors B3, M16 G Harness for open or short between ECM and "fuel level sensor unit and fuel pump"

PBIB0932E

>> Repair harness or connector.
3. CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 5 and ground.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to power in harness or connectors.
4. CHECK FUEL TANK TEMPERATURE SENSOR
Refer to, EC-301, "Component Inspection" . OK or NG
OK >> GO TO 5. NG >> Replace "fuel level sensor unit and fuel pump".

Revision: December 2006

EC-300

2006 Sentra

DTC P0182, P0183 FTT SENSOR

5. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
FUEL TANK TEMPERATURE SENSOR Check resistance by heating with hot water or heat gun as shown in the figure.

Temperature °C (°F) 20 (68) 50 (122)

Resistance k 2.3 - 2.7
0.79 - 0.90

If NG, replace "fuel level sensor unit and fuel pump".

[QG18DE]
A
EC
UBS00B6O
C
D
E

Removal and Installation
FUEL TANK TEMPERATURE SENSOR
Refer to FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" .

F
PBIB0931E UBS00B6P
G
H

I

J

K

L

M

Revision: December 2006

EC-301

2006 Sentra

DTC P0222, P0223 TP SENSOR

[QG18DE]

DTC P0222, P0223 TP SENSOR

PFP:16119

Component Description

UBS00B6Q

Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement. The throttle position sensor has the two sensors. These sensors are a kind of potentiometers which transform the throttle valve position into output voltage, and emit the voltage signal to the ECM. In addition, these sensors detect the opening and closing speed of the throttle valve and feed the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.

PBIB0145E

CONSULT-II Reference Value in Data Monitor Mode

UBS00B6R

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

THRTL SEN 1 THRTL SEN 2*

G Ignition switch: ON (Engine stopped)
G Shift lever: D (A/T), 1st (M/T)

Accelerator pedal: Fully released Accelerator pedal: Fully depressed

More than 0.36V Less than 4.75V

*: Throttle position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.

On Board Diagnosis Logic

UBS00B6S

These self-diagnoses have the one trip detection logic.

DTC No. P0222 0222
P0223 0223

Trouble diagnosis name

DTC detecting condition

Possible cause

Throttle position sensor 1 circuit low input
Throttle position sensor 1 circuit high input

An excessively low voltage from the TP sensor 1 is sent to ECM.
An excessively high voltage from the TP sensor 1 is sent to ECM.

G Harness or connectors (The TP sensor 1 circuit is open or shorted.) (The APP sensor 2 circuit is shorted.)
G Electric throttle control actuator (TP sensor 1)
G Accelerator pedal position sensor (APP sensor 2)

FAIL-SAFE MODE When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.
Engine operation condition in fail-safe mode
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. So, the acceleration will be poor.

Revision: December 2006

EC-302

2006 Sentra

DTC P0222, P0223 TP SENSOR

[QG18DE]

DTC Confirmation Procedure

UBS00B6T

NOTE:

A

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

EC

Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II

1. Turn ignition switch ON.

C

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Start engine and let it idle for 1 second.

D

4. If DTC is detected, go to EC-305, "Diagnostic Procedure" .

E

WITH GST Follow the procedure "WITH CONSULT-II" above.

F
SEF058Y
G
H

I

J

K

L

M

Revision: December 2006

EC-303

2006 Sentra

Wiring Diagram

DTC P0222, P0223 TP SENSOR

[QG18DE]
UBS00B6U

Revision: December 2006

EC-304

BBWA1461E
2006 Sentra

DTC P0222, P0223 TP SENSOR

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

47 B

Throttle position sensor power supply

[Ignition switch: ON]

Approximately 5V

C

[Ignition switch: ON]

G Engine stopped

More than 0.36V

D

G Shift lever: D (A/T), 1st (M/T)

G Accelerator pedal: Fully released

50 W

Throttle position sensor 1

[Ignition switch: ON]

E

G Engine stopped G Shift lever: D (A/T), 1st (M/T)

Less than 4.75V

G Accelerator pedal: Fully depressed

F

66 R

Throttle position sensor ground

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V
G

69 G

Throttle position sensor 2

91 R/G

Sensor power supply (Accelerator pedal position sensor 2)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully depressed
[Ignition switch: ON]

Less than 4.75V More than 0.36V Approximately 5V

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

H
I J K
UBS00B6V
L M

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-305

BBIA0515E
2006 Sentra

DTC P0222, P0223 TP SENSOR
2. CHECK THROTTLE POSITION SENSOR 1 POWER SUPPLY CIRCUIT-I
1. Disconnect electric throttle control actuator harness connector. 2. Turn ignition switch ON.

[QG18DE]

3. Check voltage between electric throttle control actuator terminal 1 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 7. NG >> GO TO 3.

BBIA0152E

3. CHECK THROTTLE POSITION SENSOR 1 POWER SUPPLY CIRCUIT-II

PBIB0082E

1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between electric throttle control actuator terminal 1 and ECM terminal 47.
Refer to Wiring Diagram.
Continuity should exist.
OK or NG OK >> GO TO 4. NG >> Repair open circuit.
4. CHECK THROTTLE POSITION SENSOR 1 POWER SUPPLY CIRCUIT-III

Check harness for short to power and short to ground, between the following terminals.

ECM terminal

Sensor terminal

Reference Wiring Diagram

47

Electric throttle control actuator terminal 1

EC-304

91

APP sensor terminal 1

EC-537

OK or NG
OK >> GO TO 5. NG >> Repair short to ground or short to power in harness or connectors.

5. CHECK APP SENSOR

Refer to EC-542, "Component Inspection" .
OK or NG OK >> GO TO 11. NG >> GO TO 6.

Revision: December 2006

EC-306

2006 Sentra

DTC P0222, P0223 TP SENSOR
6. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. 2. Perform EC-79, "Accelerator Pedal Released Position Learning" . 3. Perform EC-80, "Throttle Valve Closed Position Learning" . 4. Perform EC-80, "Idle Air Volume Learning" .

[QG18DE]
A EC

C >> INSPECTION END

7. CHECK THROTTLE POSITION SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT D 1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between ECM terminal 66 and electric throttle control actuator terminal 5.

E

Refer to Wiring Diagram.

Continuity should exist. F
4. Also check harness for short to ground and short to power.

OK or NG

OK >> GO TO 8.

G

NG >> Repair open circuit or short to ground or short to power in harness or connectors.

8. CHECK THROTTLE POSITION SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

H

1. Check harness continuity between ECM terminal 50 and electric throttle control actuator terminal 4.

Refer to Wiring Diagram.

Continuity should exist.

I

2. Also check harness for short to ground and short to power.

OK or NG

J

OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

9. CHECK THROTTLE POSITION SENSOR

K

Refer to EC-308, "Component Inspection" .

OK or NG

L

OK >> GO TO 11. NG >> GO TO 10.
M
10. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1. Replace the electric throttle control actuator. 2. Perform EC-80, "Throttle Valve Closed Position Learning" . 3. Perform EC-80, "Idle Air Volume Learning" .

>> INSPECTION END
11. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-307

2006 Sentra

DTC P0222, P0223 TP SENSOR

Component Inspection
THROTTLE POSITION SENSOR 1. Reconnect all harness connectors disconnected.
2. Perform EC-80, "Throttle Valve Closed Position Learning" .
3. Turn ignition switch ON.
4. Set selector lever to D position (A/T models) or 1st position (M/T models).
5. Check voltage between ECM terminals 50 (TP sensor 1 signal), 69 (TP sensor 2 signal) and ground under the following conditions.

Terminal

Accelerator pedal

Voltage

50 (Throttle position sensor 1)

Fully released Fully depressed

More than 0.36V Less than 4.75V

69 (Throttle position sensor 2)

Fully released Fully depressed

Less than 4.75V More than 0.36V

6. If NG, replace electric throttle control actuator and go to the next step.
7. Perform EC-80, "Throttle Valve Closed Position Learning" .
8. Perform EC-80, "Idle Air Volume Learning" .

Removal and Installation
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EM-15, "OUTER COMPONENT PARTS" .

[QG18DE]
UBS00B6W
PBIB1060E UBS00B6X

Revision: December 2006

EC-308

2006 Sentra

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MISFIRE
[QG18DE]

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MIS-

FIRE

PFP:00000 A

On Board Diagnosis Logic

UBS00B6Y

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crank- EC shaft position (CKP) sensor (POS) signal to vary, ECM can determine that a misfire is occurring.

Sensor

Input Signal to ECM

ECM function

Crankshaft position sensor (POS)

Engine speed

On board diagnosis of misfire

C

The misfire detection logic consists of the following two conditions.

1. One Trip Detection Logic (Three Way Catalyst Damage)

D

On the first trip that a misfire condition occurs that can damage the three way catalyst (TWC) due to over-

heating, the MIL will blink.

When a misfire condition occurs, the ECM monitors the CKP sensor signal every 200 engine revolutions

for a change.

E

When the misfire condition decreases to a level that will not damage the TWC, the MIL will turn off.

If another misfire condition occurs that can damage the TWC on a second trip, the MIL will blink.

When the misfire condition decreases to a level that will not damage the TWC, the MIL will remain on.

F

If another misfire condition occurs that can damage the TWC, the MIL will begin to blink again.

2. Two Trip Detection Logic (Exhaust quality deterioration) For misfire conditions that will not damage the TWC (but will affect vehicle emissions), the MIL will only G light when the misfire is detected on a second trip. During this condition, the ECM monitors the CKP sensor signal every 1,000 engine revolutions. A misfire malfunction can be detected on any one cylinder or on multiple cylinders. H

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0300 0300
P0301 0301
P0302 0302
P0303 0303

Multiple cylinder misfire detected
No.1 cylinder misfire detected
No. 2 cylinder misfire detected
No. 3 cylinder misfire detected

Multiple cylinder misfire. No. 1 cylinder misfires. No. 2 cylinder misfires. No. 3 cylinder misfires.

P0304 0304

No. 4 cylinder misfire detected

No. 4 cylinder misfires.

G Improper spark plug

G Insufficient compression

I

G Incorrect fuel pressure

G The fuel injector circuit is open or

shorted

J

G Fuel injector

G Intake air leak

G The ignition signal circuit is open or

K

shorted

G Lack of fuel

G Signal plate

L

G Air fuel ratio (A/F) sensor 1

G Incorrect PCV hose connection
M

Revision: December 2006

EC-309

2006 Sentra

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MISFIRE
[QG18DE]

DTC Confirmation Procedure

UBS00B6Z

CAUTION: Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws when driving.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II

1. Turn ignition switch ON, and select "DATA MONITOR" mode with CONSULT-II.

2. Start engine and warm it up to normal operating temperature.

3. Turn ignition switch OFF and wait at least 10 seconds.

4. Restart engine and let it idle for about 15 minutes.

5. If 1st trip DTC is detected, go to EC-310, "Diagnostic Procedure" .

NOTE: If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.
a. Turn ignition switch OFF and wait at least 10 seconds.

PBIB0164E

b. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for a certain time. Refer to the table below. Hold the accelerator pedal as steady as possible.

The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following conditions should be satisfied at the same time.

Engine speed Vehicle speed
Engine coolant temperature (T) condition

Engine speed in the freeze frame data ± 400 rpm
Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)
When the freeze frame data shows lower than 70 °C (158 °F), T should be lower than 70 °C (158 °F).
When the freeze frame data shows higher than or equal to 70 °C (158 °F), T should be higher than or equal to 70 °C (158 °F).

The time to driving varies according to the engine speed in the freeze frame data.

Engine speed Around 1,000 rpm Around 2,000 rpm More than 3,000 rpm

Time Approximately 10 minutes Approximately 5 minutes Approximately 3.5 minutes

WITH GST

Follow the procedure "WITH CONSULT-II" above.

Diagnostic Procedure
1. CHECK FOR INTAKE AIR LEAK

UBS00B70

1. Start engine and run it at idle speed. 2. Listen for the sound of the intake air leak. 3. Check PCV hose connection. OK or NG
OK >> GO TO 2. NG >> Discover air leak location and repair.

Revision: December 2006

EC-310

2006 Sentra

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MISFIRE
[QG18DE]

2. CHECK FOR EXHAUST SYSTEM CLOGGING A

Stop engine and visually check exhaust tube, three way catalyst (manifold) and muffler for dents.

OK or NG

OK >> GO TO 3.

EC

NG >> Repair or replace it.

3. PERFORM POWER BALANCE TEST

C

With CONSULT-II

1. Perform "POWER BALANCE" in "ACTIVE TEST" mode.

D

2. Is there any cylinder which does not produce a momentary engine speed drop?

E

F

Without CONSULT-II When disconnecting each fuel injector harness connector one at a time, is there any cylinder which does not produce a momentary engine speed drop?

PBIB0133E

G

H

I

J

Yes or No Yes >> GO TO 4. No >> GO TO 7.
4. CHECK FUEL INJECTOR
Does each fuel injector make an operating sound at idle? Yes or No
Yes >> GO TO 5. No >> Check fuel injector(s) and circuit(s). Refer to EC-573,
"FUEL INJECTOR" .

K
BBIA0176E
L M

PBIB1986E

Revision: December 2006

EC-311

2006 Sentra

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MISFIRE
[QG18DE]
5. CHECK FUNCTION OF IGNITION COIL-I

CAUTION: Do the following procedure in the place where ventilation is good without the combustibles.

1. Turn ignition switch OFF.

2. Remove fuel pump fuse in fuse and fusible link box to release fuel pressure.

NOTE: Do not use CONSULT-II to release fuel pressure, or fuel pressure applies again during the following procedure.

3. Start engine.

4. After engine stalls, crank it two or three times to release all fuel pressure.

5. Turn ignition switch OFF.

6. Remove all ignition coil harness connectors to avoid the electri-

LEC298

cal discharge from the ignition coils.

7. Remove ignition coil and spark plug of the cylinder to be checked.

8. Crank engine for five seconds or more to remove combustion gas in the cylinder.

9. Connect spark plug and harness connector to ignition coil.

10. Fix ignition coil using a rope etc. with gap of 13 - 17 mm between the edge of the spark plug and grounded metal portion as shown in the figure.

11. Crank engine for about three seconds, and check whether spark is generated between the spark plug and the grounded metal portion.

Spark should be generated.

CAUTION: G Do not approach to the spark plug and the ignition coil
within 50cm. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20kV or more.

PBIB2325E

G It might cause to damage the ignition coil if the gap of more than 17 mm is taken.

NOTE: When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.

OK or NG

OK >> GO TO 9. NG >> GO TO 6.

6. CHECK FUNCTION OF IGNITION COIL-II

1. Turn ignition switch OFF. 2. Disconnect spark plug and connect a known-good spark plug. 3. Crank engine for about three seconds, and recheck whether spark is generated between the spark plug
and the grounded metal portion.
Spark should be generated.
OK or NG OK >> GO TO 7. NG >> Check ignition coil, power transistor and their circuits. Refer to EC-584, "IGNITION SIGNAL" .

Revision: December 2006

EC-312

2006 Sentra

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MISFIRE
[QG18DE]

7. CHECK SPARK PLUGS A

Check the spark plugs and check for fouling, etc.

OK or NG

OK >> GO TO 8.

EC

NG >> Repair or replace spark plug (s) with standard type one

(s). For spark plug type. Refer to MA-21 .

C

8. CHECK FUNCTION OF IGNITION COIL-III

D
SEF156I
E

1. Reconnect the initial spark plugs.

2. Crank engine for about three seconds, and recheck whether spark is generated between the spark plug and the grounded portion.

F

Spark should be generated.

OK or NG

G

OK >> INSPECTION END
NG >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to MA-21 . H
9. CHECK COMPRESSION PRESSURE

Check compression pressure. Refer to EM-55, "CHECKING COMPRESSION PRESSURE" .

I

OK or NG

OK >> GO TO 10.

NG >> Check pistons, piston rings, valves, valve seats and cylinder head gaskets.

J

10. CHECK FUEL PRESSURE

1. Install all removed parts.

K

2. Release fuel pressure to zero. Refer to EC-82, "FUEL PRESSURE RELEASE" .

3. Install fuel pressure gauge and check fuel pressure. Refer to EC-83, "FUEL PRESSURE CHECK" . L
At idle: Approx. 350 kPa (3.57 kg/cm2 , 51 psi)

OK or NG

OK >> GO TO 12.

M

NG >> GO TO 11.

11. DETECT MALFUNCTIONING PART

Check the following. G Fuel pump and circuit (Refer to EC-579, "FUEL PUMP" .) G Fuel pressure regulator G Fuel lines G Fuel filter for clogging

>> Repair or replace.

Revision: December 2006

EC-313

2006 Sentra

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MISFIRE
[QG18DE]
12. CHECK IGNITION TIMING

Perform EC-73, "Basic Inspection" .

Items

Specifications

Target idle speed

A/T

800 ± 50 rpm (in P or N position)

M/T

650 ± 50 rpm

Ignition timing

A/T

18 ± 5°BTDC (in P or N position)

M/T

7 ± 5°BTDC

OK or NG

OK >> GO TO 13. NG >> Follow the EC-73, "Basic Inspection" .

13. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector and A/F sensor 1 harness connector.
3. Check harness continuity between the following terminals. Refer to EC-230, "Wiring Diagram" .

ECM terminal 16 35 56 75

A/F sensor 1 terminal 1 5 6 2

BBIA0140E

Continuity should exist.
4. Check harness continuity between ECM terminals 16, 35, 56, 75 or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to Wiring Diagram.
Continuity should not exist.
5. Also check harness for short to power. OK or NG
OK >> GO TO 14. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
14. CHECK A/F SENSOR 1 HEATER

Refer to EC-165, "Component Inspection" . OK or NG
OK >> GO TO 16. NG >> GO TO 15.
15. REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace air fuel ratio (A/F) sensor 1.
CAUTION: G Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
G Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> INSPECTION END

Revision: December 2006

EC-314

2006 Sentra

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MISFIRE
[QG18DE]

16. CHECK MASS AIR FLOW SENSOR A

With CONSULT-II

Check "MASS AIR FLOW" in "DATA MONITOR" mode with CONSULT-II.

EC

at idling:

1.4 - 4.0 g·m/sec

at 2,500 rpm: 5.0 - 10.0 g·m/sec

With GST

C

Check mass air flow sensor signal in Service $01 with GST.

at idling:

1.4 - 4.0 g·m/sec

D

at 2,500 rpm: 5.0 - 10.0 g·m/sec

OK or NG

OK >> GO TO 17.

E

NG >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or

ground. Refer to EC-177, "DTC P0101 MAF SENSOR" .

17. CHECK SYMPTOM MATRIX CHART

F

Check items on the rough idle symptom in EC-94, "Symptom Matrix Chart" .

OK or NG

G

OK >> GO TO 18.

NG >> Repair or replace.

18. ERASE THE 1ST TRIP DTC

H

Some tests may cause a 1st trip DTC to be set. Erase the 1st trip DTC from the ECM memory after performing the tests. Refer to EC-63, "HOW TO ERASE

I

EMISSION-RELATED DIAGNOSTIC INFORMATION" .

>> GO TO 19.

J

19. CHECK INTERMITTENT INCIDENT
K
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

L

M

Revision: December 2006

EC-315

2006 Sentra

DTC P0327, P0328 KS
DTC P0327, P0328 KS Component Description
The knock sensor is attached to the cylinder block. It senses engine knocking using a piezoelectric element. A knocking vibration from the cylinder block is sensed as vibrational pressure. This pressure is converted into a voltage signal and sent to the ECM.

[QG18DE]
PFP:22060
UBS00B71

On Board Diagnosis Logic

PBIB0708E UBS00B72

The MIL will not light up for these diagnoses.

DTC No.
P0327 0327 P0328 0328

Trouble Diagnosis Name
Knock sensor circuit low input
Knock sensor circuit high input

DTC Detected Condition

Possible Cause

An excessively low voltage from the sensor is sent to ECM.
An excessively high voltage from the sensor is sent to ECM.

G Harness or connectors (The sensor circuit is open or shorted.)
G Knock sensor

DTC Confirmation Procedure

UBS00B73

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II
1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II. 2. Start engine and run it for at least 5 seconds at idle speed. 3. If 1st trip DTC is detected, go to EC-318, "Diagnostic Procedure"
.

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-316

2006 Sentra

Wiring Diagram

DTC P0327, P0328 KS

[QG18DE]
UBS00B74
A EC
C D E F G H I J K L M

Revision: December 2006

EC-317

BBWA1462E
2006 Sentra

DTC P0327, P0328 KS

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

15 W

Knock sensor

[Engine is running] G Idle speed

Approximately 2.5V

Diagnostic Procedure
1. CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I

UBS00B75

1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check resistance between ECM terminal 15 and ground. Refer to Wiring Diagram.
NOTE: It is necessary to use an ohmmeter which can measure more than 10 M.
Resistance: Approximately 530 - 590k [at 20°C (68°F)]
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> GO TO 2.
2. CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II

1. Disconnect ECM harness connector and knock sensor harness connector.
2. Check harness continuity between knock sensor terminal 1 and ECM terminal 15. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
3. CHECK KNOCK SENSOR

PBIB0708E

Refer to EC-319, "Component Inspection" . OK or NG
OK >> GO TO 4. NG >> Replace knock sensor.

Revision: December 2006

EC-318

2006 Sentra

DTC P0327, P0328 KS

[QG18DE]

4. CHECK GROUND CONNECTIONS A Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

EC

C

OK or NG OK >> GO TO 5. NG >> Repair or replace ground connections.
5. CHECK KNOCK SENSOR SHIELD CIRCUIT FOR OPEN AND SHORT
1. Disconnect knock sensor harness connector. 2. Check harness continuity between knock sensor terminal 2 and ground.
Refer to Wiring Diagram.
Continuity should exist. 3. Also check harness for short to power. OK or NG
OK >> GO TO 7. NG >> GO TO 6.
6. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors F26, M58 G Harness for open or short between knock sensor and ground
>> Repair open circuit or short to power in harness connectors
7. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Component Inspection
KNOCK SENSOR Use an ohmmeter which can measure more than 10 M. 1. Disconnect knock sensor harness connector. 2. Check resistance between terminal 1 and ground.
Resistance: 530 - 590 k [at 20°C (68°F)] CAUTION: Discard any knock sensors that have been dropped or physically damaged. Use only new ones.

Revision: December 2006

EC-319

D
BBIA0515E
E F G H I J K L M
UBS00B76
SEF227W
2006 Sentra

DTC P0327, P0328 KS
Removal and Installation
KNOCK SENSOR Refer to EM-69, "CYLINDER BLOCK" .

[QG18DE]
UBS00B77

Revision: December 2006

EC-320

2006 Sentra

DTC P0335 CKP SENSOR (POS)
DTC P0335 CKP SENSOR (POS)
Component Description
The crankshaft position sensor (POS) is located on the cylinder block rear housing facing the gear teeth (cogs) of the signal plate at the end of the crankshaft. It detects the fluctuation of the engine revolution. The sensor consists of a permanent magnet and Hall IC. When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. Due to the changing magnetic field, the voltage from the sensor changes. The ECM receives the voltage signal and detects the fluctuation of the engine revolution. ECM receives the signals as shown in the figure.

[QG18DE]
PFP:23731
A
UBS00B78
EC
C
D
PBIB0562E
E
F

G

H

CONSULT-II Reference Value in Data Monitor Mode

PBIB2382E
I
UBS00B79

Specification data are reference values.
MONITOR ITEM

CONDITION

SPECIFICATION

J

ENG SPEED

G Run engine and compare CONSULT-II value with the tachometer indication.

Almost the same speed as the tachometer indication.

On Board Diagnosis Logic

K
UBS00B7A

Specification data are reference values.
DTC No. Trouble diagnosis name

DTC detecting condition

L
Possible cause

G The crankshaft position sensor (POS) signal

is not detected by the ECM during the first

M

few seconds of engine cranking.

G Harness or connectors

P0335 0335

Crankshaft position sensor (POS) circuit

G The proper pulse signal from the crankshaft position sensor (POS) is not sent to ECM while the engine is running.

(The sensor circuit is open or shorted) G Crankshaft position sensor (POS)

G The crankshaft position sensor (POS) signal G Signal plate

is not in the normal pattern during engine

running.

Revision: December 2006

EC-321

2006 Sentra

DTC P0335 CKP SENSOR (POS)

[QG18DE]

DTC Confirmation Procedure

UBS00B7B

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10V with ignition switch ON.

WITH CONSULT-II 1. Turn ignition switch ON and select "DATA MONITOR" mode with
CONSULT-II.
2. Crank engine for at least 2 seconds and run it for at least 5 seconds at idle speed.
3. If 1st trip DTC is detected, go to EC-324, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-322

2006 Sentra

Wiring Diagram

DTC P0335 CKP SENSOR (POS)

[QG18DE]
UBS00B7C
A EC
C D E F G H I J K L M

Revision: December 2006

EC-323

BBWA2173E
2006 Sentra

DTC P0335 CKP SENSOR (POS)

[QG18DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

13 Y

Crankshaft position sensor (POS)

[Engine is running]
G Warm-up condition
G Idle speed
NOTE: The pulse cycle changes depending on rpm at idle.

Approximately 3.0V

Approximately 3.0V

PBIB0527E

[Engine is running] G Engine speed: 2,000 rpm

111 W/G
119 R/G 120 R/G

ECM relay (Self shut-off) Power supply for ECM

[Engine is running] [Ignition switch: OFF] G For a few seconds after turning ignition
switch OFF
[Ignition switch: OFF] G More than a few seconds after turning
ignition switch OFF
[Ignition switch: ON]

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

0 - 1.0V

PBIB0528E

BATTERY VOLTAGE (11 - 14V)
BATTERY VOLTAGE (11 - 14V)

UBS00B7D

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-324

BBIA0515E
2006 Sentra

DTC P0335 CKP SENSOR (POS)
2. CHECK CKP SENSOR (POS) POWER SUPPLY CIRCUIT
1. Disconnect crankshaft position (CKP) sensor (POS) harness connector.
2. Turn ignition switch ON.

[QG18DE]
A EC

C

3. Check voltage between CKP sensor (POS) harness connector terminal 3 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 4. NG >> GO TO 3.

D
BBIA0156E
E
F
G

3. DETECT MALFUNCTIONING PART
Check the following. G Harness for open or short between crankshaft position sensor (POS) and ECM G Harness for open or short between crankshaft position sensor (POS) and ECM relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK CKP SENSOR (POS) GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Check harness continuity between CKP sensor (POS) terminal 1 and ground.
Refer to the wiring diagram.
Continuity should exist. 3. Also check harness for short to power. OK or NG
OK >> GO TO 6. NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors F26, M58 G Harness for open or short between crankshaft position sensor (POS) and ground
>> Repair open circuit or short to power in harness or connectors.

SEF479Y

H

I

J

K

L

M

Revision: December 2006

EC-325

2006 Sentra

DTC P0335 CKP SENSOR (POS)
6. CHECK CKP SENSOR (POS) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 13 and CKP sensor (POS) terminal 2.
Refer to Wiring Diagram.
Continuity should exist. 3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 7. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK CRANKSHAFT POSITION SENSOR (POS)
Refer to EC-326, "Component Inspection" . OK or NG
OK >> GO TO 8. NG >> Replace crankshaft position sensor (POS).
8. CHECK GEAR TOOTH
Visually check for chipping signal plate gear tooth. OK or NG
OK >> GO TO 9. NG >> Replace the signal plate.
9. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

[QG18DE]

>> INSPECTION END
Component Inspection
CRANKSHAFT POSITION SENSOR (POS) 1. Disconnect crankshaft position sensor (POS) harness connec-
tor. 2. Loosen the fixing bolt of the sensor. 3. Remove the sensor. 4. Visually check the sensor for chipping.

UBS00B7E

5. Check resistance as shown in the figure.

Terminal No. (Polarity) 3 (+) - 1 (­) 3 (+) - 2 (­) 2 (+) - 1 (­)

Resistance  [at 25°C (77°F)] Except 0 or 

If NG, replace crankshaft position sensor (POS).

Revision: December 2006

EC-326

PBIB0563E
MBIB0024E
2006 Sentra

DTC P0335 CKP SENSOR (POS)
Removal and Installation
CRANKSHAFT POSITION SENSOR (POS) Refer to EM-69, "CYLINDER BLOCK" .

[QG18DE]
UBS00B7F
A EC
C D E F G H I J K L M

Revision: December 2006

EC-327

2006 Sentra

DTC P0340 CMP SENSOR (PHASE)
DTC P0340 CMP SENSOR (PHASE)
Component Description
The camshaft position sensor (PHASE) senses the retraction of intake valve camshaft to identify a particular cylinder. The camshaft position sensor (PHASE) senses the piston position. When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor (PHASE) provides various controls of engine parts instead, utilizing timing of cylinder identification signals. The sensor consists of a permanent magnet and Hall IC. When engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. Due to the changing magnetic field, the voltage from the sensor changes. ECM receives the signals as shown in the figure.

[QG18DE]
PFP:23731
UBS00B7G
PBIB0562E

On Board Diagnosis Logic

PBIB2382E UBS00B7H

DTC No. Trouble diagnosis name

DTC detecting condition

P0340 0340

Camshaft position sensor (PHASE) circuit

G The cylinder No. signal is not sent to ECM for the first few seconds during engine cranking.
G The cylinder No. signal is not sent to ECM during engine running.
G The cylinder No. signal is not in the normal pattern during engine running.

Possible cause
G Harness or connectors (The sensor circuit is open or shorted)
G Camshaft position sensor (PHASE) G Camshaft (Intake) G Starter motor (Refer to SC-7 .) G Starting system circuit (Refer to SC-7 .) G Dead (Weak) battery

Revision: December 2006

EC-328

2006 Sentra

DTC P0340 CMP SENSOR (PHASE)

[QG18DE]

DTC Confirmation Procedure

UBS00B7I

NOTE:

A

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

EC

Before performing the following procedure, confirm that battery voltage is more than 10.5V with igni-

tion switch ON.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Crank engine for at least 2 seconds and run it for at least 5 sec-
onds at idle speed. 4. If 1st trip DTC is detected, go to EC-331, "Diagnostic Procedure"
. If 1st trip DTC is not detected, go to next step. 5. Maintaining engine speed at more than 800 rpm for at least 5 seconds. 6. If 1st trip DTC is detected, go to EC-331, "Diagnostic Procedure" .
WITH GST

C D E F
SEF058Y
G

Follow the procedure "WITH CONSULT-II" above. H

I

J

K

L

M

Revision: December 2006

EC-329

2006 Sentra

Wiring Diagram

DTC P0340 CMP SENSOR (PHASE)

[QG18DE]
UBS00B7J

Revision: December 2006

EC-330

BBWA1430E
2006 Sentra

DTC P0340 CMP SENSOR (PHASE)

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)
C

[Engine is running]

1.0 - 4.0V

G Warm-up condition

D

G Idle speed

NOTE:

The pulse cycle changes depending on

rpm at idle.

E

14 W/R

Camshaft position sensor (PHASE)

1.0 - 4.0V

PBIB0525E
F

[Engine is running]

G Engine speed: 2,000 rpm.

G

111 W/G
119 R/G 120 R/G

ECM relay (Self shut-off) Power supply for ECM

[Engine is running] [Ignition switch: OFF] G For a few seconds after turning ignition
switch OFF
[Ignition switch: OFF] G More than a few seconds after turning
ignition switch OFF
[Ignition switch: ON]

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure
1. CHECK STARTING SYSTEM

Turn ignition switch to START position. Does the engine turn over? Does the starter motor operate?
Yes or No
Yes >> GO TO 2. No >> Check starting system. (Refer to SC-7, "STARTING SYSTEM" .)

PBIB0526E
H

0 - 1.0V
I

BATTERY VOLTAGE

(11 - 14V)

J

BATTERY VOLTAGE (11 - 14V)
K

UBS00B7K
L

M

Revision: December 2006

EC-331

2006 Sentra

DTC P0340 CMP SENSOR (PHASE)
2. CHECK GROUND CONNECTIONS

[QG18DE]

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

OK or NG OK >> GO TO 3. NG >> Repair or replace ground connections.
3. CHECK CMP SENSOR (PHASE) POWER SUPPLY CIRCUIT
1. Disconnect camshaft position (CMP) sensor (PHASE) harness connector.
2. Turn ignition switch ON.

BBIA0515E

3. Check voltage between camshaft position sensor (PHASE) terminal 3 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 5. NG >> GO TO 4.

BBIA0161E

4. DETECT MALFUNCTIONING PART
Check the following. G Harness for open or short between camshaft position sensor (PHASE) and ECM G Harness for open or short between camshaft position sensor (PHASE) and ECM relay
>> Repair open circuit or short to ground or short to power in harness or connectors.

SEF479Y

Revision: December 2006

EC-332

2006 Sentra

DTC P0340 CMP SENSOR (PHASE)

[QG18DE]

5. CHECK CMP SENSOR (PHASE) GROUND CIRCUIT FOR OPEN AND SHORT A

1. Turn ignition switch OFF.

2. Check harness continuity between camshaft position sensor (PHASE) terminal 1 and ground.

Refer to the wiring diagram.

EC

Continuity should exist.

3. Also check harness for short to power.

C

OK or NG

OK >> GO TO 7.

NG >> GO TO 6.

D

6. DETECT MALFUNCTIONING PART

Check the following.

E

G Harness connectors F26, M58

G Harness for open or short between camshaft position sensor (PHASE) and ground F

>> Repair open circuit or short to power in harness or connectors.

7. CHECK CMP SENSOR (PHASE) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

G

1. Disconnect ECM harness connector.

2. Check harness continuity between CMP sensor (PHASE) terminal 2 and ECM terminal 14.

H

Refer to Wiring Diagram.

Continuity should exist. I
3. Also check harness for short to ground and short to power.

OK or NG

OK >> GO TO 8.

J

NG >> Repair open circuit or short to ground or short to power in harness or connectors.

8. CHECK CAMSHAFT POSITION SENSOR (PHASE)

K

Refer to EC-334, "Component Inspection" .

OK or NG

OK >> GO TO 9.

L

NG >> Replace camshaft position sensor (PHASE).

9. CHECK CAMSHAFT (INTAKE)

M

Check the following.
G Accumulation of debris to the signal plate of camshaft rear end G Chipping signal plate of camshaft rear end OK or NG
OK >> GO TO 10. NG >> Remove debris and clean the signal plate of camshaft
rear end or replace camshaft.

PBIB0565E

Revision: December 2006

EC-333

2006 Sentra

DTC P0340 CMP SENSOR (PHASE)
10. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Component Inspection
CAMSHAFT POSITION SENSOR (PHASE) 1. Loosen the fixing bolt of the sensor. 2. Disconnect camshaft position sensor (PHASE) harness connector. 3. Remove the sensor. 4. Visually check the sensor for chipping.

[QG18DE]
UBS00B7L

5. Check resistance as shown in the figure.

Terminal No. (Polarity) 3 (+) - 1 (-) 3 (+) - 2 (-) 2 (+) - 1 (-)

Resistance  [at 25°C (77°F)] Except 0 or 

Removal and Installation
CAMSHAFT POSITION SENSOR (PHASE)
Refer to EM-42, "TIMING CHAIN" .

PBIB0563E
MBIB0024E UBS00B7M

Revision: December 2006

EC-334

2006 Sentra

DTC P0420 THREE WAY CATALYST FUNCTION

[QG18DE]

DTC P0420 THREE WAY CATALYST FUNCTION On Board Diagnosis Logic

PFP:20905
A
UBS00B7N

The ECM monitors the switching frequency ratio of air fuel ratio (A/F) sensor 1 and heated oxygen sensor 2. EC

C

D

PBIB1216E

E

A three way catalyst (manifold) with high oxygen storage capacity will indicate a low switching frequency of

heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching fre-

quency will increase.

F

When the frequency ratio of air fuel ratio (A/F) sensor 1 and heated oxygen sensor 2 approaches a specified

limit value, the three way catalyst (manifold) malfunction is diagnosed.

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

G

G Three way catalyst (manifold)

G Exhaust tube

G Three way catalyst (manifold) does not oper- G Intake air leaks

H

P0420 0420

Catalyst system efficiency below threshold

ate properly. G Fuel injector
G Three way catalyst (manifold) does not have

enough oxygen storage capacity.

G Fuel injector leaks G Spark plug

I

G Improper ignition timing

DTC Confirmation Procedure

UBS00B7O

J

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

K

WITH CONSULT-II

TESTING CONDITION: Do not hold engine speed for more than the specified minutes below.
1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.
2. Start engine and warm it up to normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 1 minute. 6. Make sure that "COOLAN TEMP/S" indicates more than 70°C
(158°F). 7. Open engine hood.

L M
SEF189Y

Revision: December 2006

EC-335

2006 Sentra

DTC P0420 THREE WAY CATALYST FUNCTION
8. Select "DTC & SRT CONFIRMATION" then "SRT WORK SUPPORT" mode with CONSULT-II.
9. Rev engine up to 2,500 to 3,500 rpm and hold it for 3 consecutive minutes, then release the accelerator pedal completely. If "INCMP" of "CATALYST" changed to "CMPLT", go to step 12.
10. Wait 5 seconds at idle.

[QG18DE]

11. Rev engine up to 2,000 to 3,000 rpm and maintain it until "IMCMP" of "CATALYST" changes to "CMPLT" (it will take approximately 5 minutes). If not "CMPLT", stop engine and cool it down to less than 70°C (158°F) and then retest step 1.

PBIB1784E

12. Select "SELF-DIAG RESULTS" mode with CONSULT-II.
13. Confirm that the 1st trip DTC is not detected. If the 1st trip DTC is detected, go to EC-337, "Diagnostic Procedure" .

PBIB1785E

SEF535Z

Overall Function Check

UBS00B7P

Use this procedure to check the overall function of the three way catalyst (manifold). During this check, a 1st trip DTC might not be confirmed.

WITH GST

1. Start engine and warm it up to the normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. 4. Let engine idle for 1 minute. 5. Open engine hood. 6. Set voltmeter probe between ECM terminal 74 and ground. 7. Keep engine speed at 2,500 rpm constant under no load. 8. Make sure that the voltage does not vary for more than 5 sec-
onds. If the voltage fluctuation cycle takes less than 5 seconds, go to EC-337, "Diagnostic Procedure" . G 1 cycle: 0.6 - 1.0 V  0 - 0.3 V  0.6 - 1.0 V

Revision: December 2006

EC-336

PBIB1197E
2006 Sentra

DTC P0420 THREE WAY CATALYST FUNCTION
Diagnostic Procedure
1. CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dent. OK or NG
OK >> GO TO 2. NG >> Repair or replace.
2. CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle. 2. Listen for an exhaust gas leak before the three way catalyst (manifold).

OK or NG OK >> GO TO 3. NG >> Repair or replace.
3. CHECK INTAKE AIR LEAK

Listen for an intake air leak after the mass air flow sensor. OK or NG
OK >> GO TO 4. NG >> Repair or replace.
4. CHECK IGNITION TIMING

Check for ignition timing. Refer to EC-73, "Basic Inspection" .

Items

Specifications

Target idle speed

A/T

800 ± 50 rpm (in P or N position)

M/T

650 ± 50 rpm

Ignition timing

A/T

18 ± 5°BTDC (in P or N position)

M/T

7 ± 5°BTDC

OK or NG
OK >> GO TO 5. NG >> Follow the EC-73, "Basic Inspection" .

[QG18DE]
UBS00B7Q
A EC
C D E F G
PBIB1216E
H I J K L M

Revision: December 2006

EC-337

2006 Sentra

DTC P0420 THREE WAY CATALYST FUNCTION
5. CHECK FUEL INJECTOR

[QG18DE]

1. Stop engine and then turn ignition switch ON. 2. Check voltage between ECM terminals 22, 23, 41, 42 and
ground with CONSULT-II or tester. Refer to Wiring Diagram for FUEL INJECTOR EC-574, "Wiring Diagram" .
: Battery voltage should exist.
OK or NG OK >> GO TO 6. NG >> Perform Diagnostic Procedure FUEL INJECTOR, EC573, "FUEL INJECTOR"
6. CHECK FUNCTION OF IGNITION COIL-I

MBIB0030E

CAUTION: Do the following procedure in the place where ventilation is good without the combustibles.

1. Turn ignition switch OFF.

2. Remove fuel pump fuse in fuse and fusible link box to release fuel pressure.

NOTE: Do not use CONSULT-II to release fuel pressure, or fuel pressure applies again during the following procedure.

3. Start engine.

4. After engine stalls, crank it two or three times to release all fuel pressure.

5. Turn ignition switch OFF.

6. Remove all ignition coil harness connectors to avoid the electri-

LEC298

cal discharge from the ignition coils.

7. Remove ignition coil and spark plug of the cylinder to be checked.

8. Crank engine for five seconds or more to remove combustion gas in the cylinder.

9. Connect spark plug and harness connector to ignition coil.

10. Fix ignition coil using a rope etc. with gap of 13 - 17 mm between the edge of the spark plug and grounded metal portion as shown in the figure.

11. Crank engine for about three seconds, and check whether spark is generated between the spark plug and the grounded metal portion.

Spark should be generated.

CAUTION: G Do not approach to the spark plug and the ignition coil
within 50cm. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20kV or more.

PBIB2325E

G It might cause to damage the ignition coil if the gap of more than 17 mm is taken.

NOTE: When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.

OK or NG

OK >> GO TO 9. NG >> GO TO 7.

Revision: December 2006

EC-338

2006 Sentra

DTC P0420 THREE WAY CATALYST FUNCTION

[QG18DE]

7. CHECK FUNCTION OF IGNITION COIL-II A
1. Turn ignition switch OFF.
2. Disconnect spark plug and connect a known-good spark plug. 3. Crank engine for about three seconds, and recheck whether spark is generated between the spark plug EC
and the grounded metal portion.

Spark should be generated.

C

OK or NG

OK >> GO TO 8.

NG >> Check ignition coil, power transistor and their circuits. Refer to EC-584 .

D

8. CHECK FUNCTION OF IGNITION COIL-III

1. Reconnect the initial spark plugs.

E

2. Crank engine for about three seconds, and recheck whether spark is generated between the spark plug and the grounded portion. F Spark should be generated.

OK or NG

OK >> INSPECTION END

G

NG >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to MA-21 .

9. CHECK FUEL INJECTOR

H

1. Turn ignition switch OFF.

2. Remove fuel tube assembly. Refer to EM-21, "FUEL INJECTOR AND FUEL TUBE" .

Keep fuel hose and all fuel injectors connected to fuel tube.

I

3. Reconnect all fuel injector harness connectors.

4. Disconnect all ignition coil harness connectors. J
5. Turn ignition switch ON. Make sure fuel does not drip from fuel injector.

OK or NG

K

OK (Does not drip)>>GO TO 10.

NG (Drips)>>Replace the fuel injector(s) from which fuel is dripping.

10. CHECK INTERMITTENT INCIDENT

L

Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
M Trouble is fixed>>INSPECTION END Trouble is not fixed>>Replace three way catalyst (manifold).

Revision: December 2006

EC-339

2006 Sentra

DTC P0441 EVAP CONTROL SYSTEM

[QG18DE]

DTC P0441 EVAP CONTROL SYSTEM

PFP:14950

System Description

UBS00B7R

NOTE: If DTC P0441 is displayed with other DTC such as P2122, P2123 P2127, P2128, P2138, first perform trouble diagnosis for other DTC.

PBIB1209E
In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions. Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP canister purge volume control solenoid valve is open to admit purge flow. Purge flow exposes the EVAP control system pressure sensor to intake manifold vacuum.

On Board Diagnosis Logic

UBS00B7S

Under normal conditions (non-closed throttle), sensor output voltage indicates if pressure drop and purge flow are adequate. If not, a malfunction is determined.

DTC No.
P0441 0441

Trouble diagnosis name

DTC detecting condition

Possible cause

EVAP control system incorrect purge flow

G EVAP canister purge volume control solenoid valve stuck closed

G EVAP control system pressure sensor and the circuit

EVAP control system does not operate properly, EVAP control system has a leak between intake manifold and EVAP control system pressure sensor.

G Loose, disconnected or improper connection of rubber tube
G Blocked rubber tube
G Cracked EVAP canister
G EVAP canister purge volume control solenoid valve circuit

G Accelerator pedal position sensor

G Blocked purge port

G EVAP canister vent control valve

Revision: December 2006

EC-340

2006 Sentra

DTC P0441 EVAP CONTROL SYSTEM

[QG18DE]

DTC Confirmation Procedure
CAUTION: Always drive vehicle at a safe speed.

UBS00B7T
A

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

EC

least 10 seconds before conducting the next test.

TESTING CONDITION:

Always perform test at a temperature of 0°C (32°F) or more.

C

WITH CONSULT-II

1. Start engine and warm it up to normal operating temperature.

D

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Start engine and let it idle for at least 70 seconds.

4. Select "PURG FLOW P0441" of "EVAPORATIVE SYSTEM" in "DTC CONFIRMATION" mode with CON- E SULT-II.

5. Touch "START".

If "COMPLETED" is displayed, go to step 7.

F

6. When the following conditions are met, "TESTING" will be displayed on the CONSULT-II screen. Maintain

the conditions continuously until "TESTING" changes to "COMPLETED". (It will take at least 35 seconds.)

Selector lever

Suitable position

G

Vehicle speed

32 - 120 km/h (20 - 75 MPH)

ENG SPEED

500 - 3,800 rpm

H

B/FUEL SCHDL

1.0 - 8.2 msec

Engine coolant temperature

More than 0°C (32°F)

I

J

K

L
PBIB0826E

If "TESTING" is not changed for a long time, retry from step 2.

7. Make sure that OK is displayed after touching "SELF-DIAG RESULTS". If NG is displayed, refer to EC342, "Diagnostic Procedure" .

M

Overall Function Check

UBS00B7U

Use this procedure to check the overall monitoring function of the EVAP control system purge flow monitoring. During this check, a 1st trip DTC might not be confirmed.

WITH GST

1. Lift up drive wheels. 2. Start engine and warm it up to normal operating temperature. 3. Turn ignition switch OFF, wait at least 10 seconds. 4. Start engine and wait at least 70 seconds.

Revision: December 2006

EC-341

2006 Sentra

DTC P0441 EVAP CONTROL SYSTEM
5. Set voltmeter probes to ECM terminals 32 (EVAP control system pressure sensor signal) and ground.
6. Check EVAP control system pressure sensor value at idle speed and note it.
7. Establish and maintain the following conditions for at least 1 minute.

[QG18DE]

Air conditioner switch

ON

Headlamp switch

ON

Rear window defogger switch Engine speed

ON Approx. 3,000 rpm

PBIB1109E

Gear position

Any position other than P, N or R

8. Verify that EVAP control system pressure sensor value stays 0.1V less than the value at idle speed (measured at step 6) for at least 1 second.
9. If NG, go to EC-342, "Diagnostic Procedure" .

Diagnostic Procedure
1. CHECK EVAP CANISTER

UBS00B7V

1. Turn ignition switch OFF. 2. Check EVAP canister for cracks. OK or NG
OK (With CONSULT-II) >>GO TO 2. OK (Without CONSULT-II) >>GO TO 3. NG >> Replace EVAP canister.
2. CHECK PURGE FLOW

With CONSULT-II
1. Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP service port and install vacuum gauge.
2. Start engine and let it idle.
3. Select "PURG VOL CONT/V" in "ACTIVE TEST" mode with CONSULT-II.
4. Rev engine up to 2,000 rpm.

5. Touch "Qd" and "Qu" on CONSULT-II screen to adjust "PURG VOL CONT/V" opening and check vacuum existence.

PURG VOL CONT/V
100%
0%
OK or NG OK >> GO TO 7. NG >> GO TO 4.

VACUUM Should exist. should not exist.

BBIA0517E PBIB1786E

Revision: December 2006

EC-342

2006 Sentra

DTC P0441 EVAP CONTROL SYSTEM
3. CHECK PURGE FLOW
Without CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Stop engine. 3. Disconnect vacuum hose connected to EVAP canister purge
volume control solenoid valve at EVAP service port and install vacuum gauge. 4. Start engine and let it idle. Do not depress accelerator pedal even slightly. 5. Check vacuum gauge indication before 60 seconds passed after starting engine.
Vacuum should not exist.
6. Revving engine up to 2,000 rpm after 100 seconds passed after starting engine.
Vacuum should exist.
OK or NG OK >> GO TO 7. NG >> GO TO 4.
4. CHECK EVAP PURGE LINE
1. Turn ignition switch OFF. 2. Check EVAP purge line for improper connection or disconnection.
Refer to EC-36, "EVAPORATIVE EMISSION LINE DRAWING" . OK or NG
OK >> GO TO 5. NG >> Repair it.
5. CHECK EVAP PURGE HOSE AND PURGE PORT
1. Disconnect purge hoses connected to EVAP service port A and EVAP canister purge volume control solenoid valve B .
2. Blow air into each hose and EVAP purge port C .

3. Check that air flows freely.
OK or NG
OK (With CONSULT-II)>>GO TO 6. OK (Without CONSULT-II)>>GO TO 7. NG >> Repair or clean hoses and/or purge port.

Revision: December 2006

EC-343

[QG18DE]
A EC
C D E
BBIA0517E
F G H I J K L M
SEF367U
SEF368U
2006 Sentra

DTC P0441 EVAP CONTROL SYSTEM
6. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
With CONSULT-II 1. Start engine. 2. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode with
CONSULT-II. Check that engine speed varies according to the valve opening. OK or NG OK >> GO TO 8. NG >> GO TO 7.

[QG18DE]

7. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to EC-374, "Component Inspection" . OK or NG
OK >> GO TO 8. NG >> Replace EVAP canister purge volume control solenoid valve.
8. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
2. Check connectors for water.
Water should not exist.
OK or NG OK >> GO TO 9. NG >> Replace EVAP control system pressure sensor.

PBIB1786E

9. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR FUNCTION

BBIA0157E

Refer to DTC Confirmation Procedure for DTC P0452, EC-388, "DTC Confirmation Procedure" P0453, EC388, "DTC Confirmation Procedure" . OK or NG
OK >> GO TO 10. NG >> Replace EVAP control system pressure sensor.
10. CHECK RUBBER TUBE FOR CLOGGING

1. Disconnect rubber tube connected to EVAP canister vent control valve. 2. Check the rubber tube for clogging. OK or NG
OK >> GO TO 11. NG >> Clean the rubber tube using an air blower.

Revision: December 2006

EC-344

2006 Sentra

DTC P0441 EVAP CONTROL SYSTEM
11. CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to EC-374, "Component Inspection" . OK or NG
OK >> GO TO 12. NG >> Replace EVAP canister vent control valve.
12. CHECK EVAP PURGE LINE
Inspect EVAP purge line (pipe and rubber tube). Check for evidence of leaks. Refer to EC-36, "EVAPORATIVE EMISSION LINE DRAWING" . OK or NG
OK >> GO TO 13. NG >> Replace it.
13. CLEAN EVAP PURGE LINE
Clean EVAP purge line (pipe and rubber tube) using air blower.
>> GO TO 14.
14. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END

[QG18DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-345

2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM

[QG18DE]

DTC P0442 EVAP CONTROL SYSTEM

PFP:14950

On Board Diagnosis Logic

UBS00B7W

This diagnosis detects leaks in the EVAP purge line using engine intake manifold vacuum. If pressure does not increase, the ECM will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve, under the following "Vacuum test" conditions. The EVAP canister vent control valve is closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve will then be opened to depressurize the EVAP purge line using intake manifold vacuum. After this occurs, the EVAP canister purge volume control solenoid valve will be closed.

PBIB1209E

DTC No.
P0442 0442

Trouble diagnosis name

DTC detecting condition

Possible cause

EVAP control system small leak detected (negative pressure)

EVAP control system has a leak, EVAP control system does not operate properly.

G Incorrect fuel tank vacuum relief valve G Incorrect fuel filler cap used G Fuel filler cap remains open or fails to close. G Foreign matter caught in fuel filler cap. G Leak is in line between intake manifold and
EVAP canister purge volume control solenoid valve. G Foreign matter caught in EVAP canister vent control valve. G EVAP canister or fuel tank leaks G EVAP purge line (pipe and rubber tube) leaks G EVAP purge line rubber tube bent G Loose or disconnected rubber tube G EVAP canister vent control valve and the circuit G EVAP canister purge volume control solenoid valve and the circuit G Fuel tank temperature sensor G O-ring of EVAP canister vent control valve is missing or damaged G EVAP canister is saturated with water G EVAP control system pressure sensor G Fuel level sensor and the circuit G Refueling EVAP vapor cut valve G Refueling control valve G ORVR system leaks

Revision: December 2006

EC-346

2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM

[QG18DE]

CAUTION:
G Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used, A the MIL may come on.

G If the fuel filler cap is not tightened properly, the MIL may come on.

G Use only a genuine NISSAN rubber tube as a replacement.

EC

DTC Confirmation Procedure

UBS00B7X

NOTE:

C

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION: G Perform "DTC WORK SUPPORT" when the fuel level is between 1/4 and 3/4 full, and vehicle is D

placed on flat level surface.

G Always perform test at a temperature of 0 to 30°C (32 to 86°F). E
G Open engine hood before conducting following procedure.

WITH CONSULT-II

1. Turn ignition switch ON.

F

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.

4. Make sure that the following conditions are met.

G

COOLAN TEMP/S: 0 - 70°C (32 - 158°F)

INT/A TEMP SE: 0 - 60°C (32 - 140°F)

5. Select "EVP SML LEAK P0442/P1442" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode H

with CONSULT-II.

Follow the instruction displayed.

I

J

K

L

PBIB0829E

NOTE:

If the engine speed cannot be maintained within the range displayed on the CONSULT-II screen, go to EC-73, "Basic Inspection" .

M

6. Make sure that OK is displayed. If NG is displayed, refer to EC-348, "Diagnostic Procedure" .

NOTE: Make sure that EVAP hoses are connected to the EVAP canister purge volume control solenoid valve properly.

WITH GST
NOTE: Be sure to read the explanation of EC-60, "Driving Pattern" before driving vehicle. 1. Start engine.

Revision: December 2006

EC-347

SEC763C
2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM
2. Drive vehicle according to EC-60, "Driving Pattern" . 3. Stop vehicle. 4. Turn ignition switch OFF and wait at least 10 seconds. 5. Select Service $07 with GST. ­ If P0442 is displayed on the screen, go to EC-348, "Diagnostic Procedure" . ­ If P0441 is displayed on the screen, go to DTC P0441, EC-342, "Diagnostic Procedure" .
Diagnostic Procedure
1. CHECK FUEL FILLER CAP DESIGN
1. Turn ignition switch OFF. 2. Check for genuine NISSAN fuel filler cap design. OK or NG
OK >> GO TO 2. NG >> Replace with genuine NISSAN fuel filler cap.

[QG18DE]
UBS00B7Y

2. CHECK FUEL FILLER CAP INSTALLATION
Check that the cap is tightened properly by rotating the cap clockwise. OK or NG
OK >> GO TO 3. NG >> 1. Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.
2. Retighten until ratcheting sound is heard.
3. CHECK FUEL FILLER CAP FUNCTION
Check for air releasing sound while opening the fuel filler cap. OK or NG
OK >> GO TO 5. NG >> GO TO 4.
4. CHECK FUEL TANK VACUUM RELIEF VALVE
Refer to EC-38, "Component Inspection" . OK or NG
OK >> GO TO 5. NG >> Replace fuel filler cap with a genuine one.

SEF915U

Revision: December 2006

EC-348

2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM
5. INSTALL THE PRESSURE PUMP
To locate the EVAP leak, install EVAP service port adapter and pressure pump to EVAP service port securely. NOTE: Improper installation of the EVAP service port adapter to the EVAP service port may cause leaking.

Models with CONSULT-II>>GO TO 6. Models without CONSULT-II >>GO TO 7.
6. CHECK FOR EVAP LEAK
With CONSULT-II 1. Turn ignition switch ON. 2. Select "EVAP SYSTEM CLOSE" of "WORK SUPPORT" mode
with CONSULT-II. 3. Touch "START" and apply pressure into the EVAP line until the
pressure indicator reaches the middle of the bar graph. NOTE: G Never use compressed air or a high pressure pump. G Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pres-
sure in the system.
4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. Refer to EC-36, "EVAPORATIVE EMISSION LINE DRAWING" .
OK or NG OK >> GO TO 8. NG >> Repair or replace.

Revision: December 2006

EC-349

[QG18DE]
A EC

C
D
BBIA0517E
E

F

G

SEF916U

H

I J

K L

M

PEF917U

SEF200U
2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM
7. CHECK FOR EVAP LEAK
Without CONSULT-II 1. Turn ignition switch OFF. 2. Apply 12 volts DC to EVAP canister vent control valve. The
valve will close. (Continue to apply 12 volts until the end of test.) 3. Pressurize the EVAP line using pressure pump with 1.3 to 2.7
kPa (10 to 20 mmHg, 0.39 to 0.79 inHg), then remove pump and EVAP service port adapter. NOTE: G Never use compressed air or a high pressure pump. G Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pres-
sure in the system.
4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. Refer to EC-36, "EVAPORATIVE EMISSION LINE DRAWING" .
OK or NG OK >> GO TO 8. NG >> Repair or replace.

[QG18DE]
BBIA0157E

8. CHECK EVAP CANISTER VENT CONTROL VALVE

SEF200U

Check the following. G EVAP canister vent control valve is installed properly.
Refer to EC-39, "EVAP CANISTER VENT CONTROL VALVE" . G EVAP canister vent control valve.
Refer to EC-374, "Component Inspection" . OK or NG
OK >> GO TO 10. NG >> Repair or replace EVAP canister vent control valve and O-ring.
9. CHECK IF EVAP CANISTER SATURATED WITH WATER

1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
2. Does water drain from the EVAP canister?
Yes or No
Yes >> GO TO 10. No (With CONSULT-II)>>GO TO 12. No (Without CONSULT-II)>>GO TO 13.

Revision: December 2006

EC-350

PBIB1213E
2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM

[QG18DE]

10. CHECK EVAP CANISTER A

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor

attached.

The weight should be less than 1.9 kg (4.2 lb).

EC

OK or NG

OK (With CONSULT-II)>>GO TO 12.

OK (Without CONSULT-II)>>GO TO 13.

C

NG >> GO TO 11.

11. DETECT MALFUNCTIONING PART D

Check the following.

G EVAP canister for damage

G EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

E

>> Repair hose or replace EVAP canister. F
12. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

With CONSULT-II

G

1. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.

2. Start engine.

3. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode.

H

4. Touch "Qu" on CONSULT-II screen to increase "PURG VOL CONT/V" opening to 100%.

5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

I

Vacuum should exist.

OK or NG

J

OK >> GO TO 15.
NG >> GO TO 14. K

PBIB1786E

L

13. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

Without CONSULT-II

M

1. Start engine and warm it up to normal operating temperature.

2. Stop engine.

3. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.

4. Start engine and let it idle for at least 80 seconds.

5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

Vacuum should exist.
OK or NG OK >> GO TO 15. NG >> GO TO 14.

Revision: December 2006

EC-351

2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM
14. CHECK VACUUM HOSE

[QG18DE]

Check vacuum hoses for clogging or disconnection. Refer to EC-104, "Vacuum Hose Drawing" . OK or NG
OK >> GO TO 15. NG >> Repair or reconnect the hose.
15. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to EC-367, "Component Inspection" . OK or NG
OK >> GO TO 16. NG >> Replace EVAP canister purge volume control solenoid valve.
16. CHECK FUEL TANK TEMPERATURE SENSOR

Refer to EC-301, "Component Inspection" . OK or NG
OK >> GO TO 17. NG >> Replace fuel level sensor unit.
17. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to EC-386, "Component Inspection" . OK or NG
OK >> GO TO 18. NG >> Replace EVAP control system pressure sensor.
18. CHECK EVAP PURGE LINE

Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection. Refer to EC-36, "EVAPORATIVE EMISSION LINE DRAWING" . OK or NG
OK >> GO TO 19. NG >> Repair or reconnect the hose.
19. CLEAN EVAP PURGE LINE

Clean EVAP purge line (pipe and rubber tube) using air blower.

>> GO TO 20.
20. CHECK EVAP/ORVR LINE
Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper connection. For location, refer to EC-42, "ON BOARD REFUELING VAPOR RECOVERY (ORVR)" . OK or NG
OK >> GO TO 21. NG >> Repair or replace hoses and tubes.
21. CHECK SIGNAL LINE AND RECIRCULATION LINE
Check signal line and recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, looseness and improper connection. OK or NG
OK >> GO TO 22. NG >> Repair or replace hoses, tubes or filler neck tube.

Revision: December 2006

EC-352

2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM
22. CHECK REFUELING CONTROL VALVE
Refer to EC-46, "Component Inspection" . OK or NG
OK >> GO TO 23. NG >> Replace refueling control valve with fuel tank.
23. CHECK REFUELING EVAP VAPOR CUT VALVE
Refer to EC-46, "REFUELING EVAP VAPOR CUT VALVE" . OK or NG
OK >> GO TO 24. NG >> Replace refueling EVAP vapor cut valve with fuel tank.
24. CHECK FUEL LEVEL SENSOR
Refer to DI-6, "FUEL GAUGE" . OK or NG
OK >> GO TO 25. NG >> Replace fuel level sensor unit.
25. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END

[QG18DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-353

2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QG18DE]

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

PFP:14920

Description
SYSTEM DESCRIPTION

UBS00BET

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS) Camshaft position sensor (PHASE)

Engine speed*1

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Battery Throttle position sensor Accelerator pedal position sensor

Battery voltage*1 Throttle position Accelerator pedal position

EVAP canister purge flow control

EVAP canister purge volume control solenoid valve

Air fuel ratio (A/F) sensor 1

Density of oxygen in exhaust gas (Mixture ratio feedback signal)

Fuel tank temperature sensor

Fuel temperature in fuel tank

Vehicle speed sensor*2

Vehicle speed

*1: ECM determines the start signal status by the signals of engine speed and battery voltage. *2: This signal is sent to the ECM through CAN communication line.

This system controls flow rate of fuel vapor from the EVAP canister. The opening of the vapor by-pass passage in the EVAP canister purge volume control solenoid valve changes to control the flow rate. The EVAP canister purge volume control solenoid valve repeats ON/OFF operation according to the signal sent from the ECM. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor from the EVAP canister is regulated as the air flow changes.

COMPONENT DESCRIPTION
The EVAP canister purge volume control solenoid valve uses a ON/ OFF duty to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge volume control solenoid valve is moved by ON/OFF pulses from the ECM. The longer the ON pulse, the greater the amount of fuel vapor that will flow through the valve.

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

CONDITION

PURG VOL C/V

G Engine: After warming up G Air conditioner switch: OFF G Shift lever: P or N (A/T), Neu-
tral (M/T) G No load

Idle (Accelerator pedal is not depressed even slightly, after engine starting.)
2,000 rpm

SEF337U UBS00BEU
SPECIFICATION 0% --

Revision: December 2006

EC-354

2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QG18DE]

On Board Diagnosis Logic
DTC No. Trouble diagnosis name

DTC detecting condition

P0443 0443

EVAP canister purge volume control solenoid valve

The canister purge flow is detected during the specified driving conditions, even when EVAP canister purge volume control solenoid valve is completely closed.

Possible cause

UBS00BEV
A

G EVAP control system pressure sensor

G EVAP canister purge volume control

EC

solenoid valve

(The valve is stuck open.)

G EVAP canister vent control valve

C

G EVAP canister

G Hoses

(Hoses are connected incorrectly or clogged.)

D

DTC Confirmation Procedure

UBS00BEW

NOTE:

E

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

F

Always perform test at a temperature of 0°C (32°F) or more.

WITH CONSULT-II

1. Start engine and warm it up to normal operating temperature.

G

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Turn ignition switch ON. 4. Select "PURG VOL CN/V P1444" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with H
CONSULT-II.

5. Touch "START". I

J

K

L
PBIB0839E

6. Start engine and let it idle until "TESTING" on CONSULT-II changes to "COMPLETED". (It will take

approximately 10 seconds.)

M

If "TESTING" is not displayed after 5 minutes, retry from step 2.

7. Make sure that OK is displayed after touching "SELF-DIAG RESULTS". If NG is displayed, refer to EC358, "Diagnostic Procedure" .

WITH GST 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Start engine and let it idle for at least 20 seconds. 4. Select Service $07 with GST. 5. If 1st trip DTC is detected, go to EC-358, "Diagnostic Procedure" .

Revision: December 2006

EC-355

2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QG18DE]

Wiring Diagram

UBS00BEX

Revision: December 2006

EC-356

BBWA1431E
2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)
C
BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

D

G Idle speed

G Accelerator pedal: Not depressed even

slightly, after engine starting.

E

45 GY/L

EVAP canister purge volume control solenoid valve

PBIB0050E

Approximately 10V

F

[Engine is running]

G Engine speed: About 2,000 rpm (More

G

than 100 seconds after starting engine)

PBIB0520E

H

[Engine is running]

[Ignition switch: OFF]

0 - 1.0V G For a few seconds after turning ignition

I

111 W/G

ECM relay (Self shut-off)

switch OFF

[Ignition switch: OFF]

G More than a few seconds after turning

BATTERY VOLTAGE (11 - 14V)

J

ignition switch OFF

119 R/G 120 R/G

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE

(11 - 14V)

K

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

L

M

Revision: December 2006

EC-357

2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QG18DE]

Diagnostic Procedure

UBS00BEY

1. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE POWER SUPPLY CIR-

CUIT

1. Turn ignition switch OFF. 2. Disconnect EVAP canister purge volume control solenoid valve
harness connector.
3. Turn ignition switch ON.

4. Check voltage between EVAP canister purge volume control solenoid valve terminal 1 and engine ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 3. NG >> GO TO 2.

BBIA0518E

2. DETECT MALFUNCTIONING PART

PBIB0080E

Check the following. G Harness for open or short between EVAP canister purge volume control solenoid valve and ECM relay G Harness for open or short between EVAP canister purge volume control solenoid valve and ECM

>> Repair harness or connectors.
3. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OUTPUT SIGNAL CIR-
CUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 45 and EVAP canister purge volume control solenoid
valve terminal 2. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-358

2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QG18DE]

4. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR A

1. Disconnect EVAP control system pressure sensor harness connector.

2. Check connectors for water.

EC

Water should not exist.

OK or NG

C

OK >> GO TO 5.

NG >> Replace EVAP control system pressure sensor.

D

5. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

BBIA0157E
E

Refer to EC-392, "Component Inspection" .

OK or NG

F

OK (With CONSULT-II)>>GO TO 6.

OK (Without CONSULT-II)>>GO TO 7.

NG >> Replace EVAP control system pressure sensor. G
6. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

With CONSULT-II

H

1. Turn ignition switch OFF.

2. Reconnect harness connectors disconnected.

3. Start engine.

I

4. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode with

CONSULT-II. Check that engine speed varies according to the

valve opening.

J

OK or NG

OK >> GO TO 8.

NG >> GO TO 7.

K

7. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to EC-399, "Component Inspection" . OK or NG
OK >> GO TO 8. NG >> Replace EVAP canister purge volume control solenoid valve.
8. CHECK RUBBER TUBE FOR CLOGGING
1. Disconnect rubber tube connected to EVAP canister vent control valve. 2. Check the rubber tube for clogging. OK or NG
OK >> GO TO 9. NG >> Clean the rubber tube using an air blower.

L
PBIB1786E
M

Revision: December 2006

EC-359

2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QG18DE]
9. CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to EC-374, "Component Inspection" . OK or NG
OK >> GO TO 11. NG >> Replace EVAP canister vent control valve.
10. CHECK IF EVAP CANISTER SATURATED WITH WATER
1. Remove EVAP canister with EVAP canister vent control valve attached. 2. Check if water will drain from the EVAP canister. Yes or No
Yes >> GO TO 11. No >> GO TO 13.

11. CHECK EVAP CANISTER
Weigh the EVAP canister with the EVAP canister vent control valve attached. The weight should be less than 1.9 kg (4.2 lb).
OK or NG OK >> GO TO 13. NG >> GO TO 12.
12. DETECT MALFUNCTIONING PART
Check the following. G EVAP canister for damage G EVAP hose between EVAP canister and vehicle frame for clogging or poor connection
>> Repair hose or replace EVAP canister.
13. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END

PBIB1213E

Revision: December 2006

EC-360

2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QG18DE]

Component Inspection
EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
With CONSULT-II
Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions.

UBS00BEZ
A
EC

Condition

Air passage continuity

(PURG VOL CONT/V value)

between A and B

C

100%

Yes

0%

No

D

Without CONSULT-II
Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions.

Condition
12V direct current supply between terminals 1 and 2 No supply

Air passage continuity between A and B
Yes
No

Removal and Installation
EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to EM-15, "Removal and Installation" .

PBIB0149E
E
F
G H
PBIB0150E
I
UBS00BJU
J

K

L

M

Revision: December 2006

EC-361

2006 Sentra

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QG18DE]

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID

VALVE

PFP:14920

Description
SYSTEM DESCRIPTION

UBS00B7Z

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS) Camshaft position sensor (PHASE)

Engine speed*2

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Battery Throttle position sensor Accelerator pedal position sensor

Battery voltage*2 Throttle position Accelerator pedal position

EVAP canister purge flow control

EVAP canister purge volume control solenoid valve

Air fuel ratio (A/F) sensor 1

Density of oxygen in exhaust gas (Mixture ratio feedback signal)

Vehicle speed sensor*1

Vehicle speed

*1: This signal is sent to the ECM through CAN communication line. *2: The ECM determines the start signal status by the signal of engine speed and battery voltage.

This system controls flow rate of fuel vapor from the EVAP canister. The opening of the vapor by-pass passage in the EVAP canister purge volume control solenoid valve changes to control the flow rate. The EVAP canister purge volume control solenoid valve repeats ON/OFF operation according to the signal sent from the ECM. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor from the EVAP canister is regulated as the air flow changes.

COMPONENT DESCRIPTION
The EVAP canister purge volume control solenoid valve uses a ON/ OFF duty to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge volume control solenoid valve is moved by ON/OFF pulses from the ECM. The longer the ON pulse, the greater the amount of fuel vapor that will flow through the valve.

CONSULT-II Reference Value in Data Monitor Mode

SEF337U UBS00B80

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

PURG VOL C/V

G Engine: After warming up G Air conditioner switch OFF G Shift lever: P or N (A/T), Neutral (M/T) G No load

Idle (Accelerator is not depressed even slightly, after engine starting)

0%

2,000 rpm

--

Revision: December 2006

EC-362

2006 Sentra

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QG18DE]

On Board Diagnosis Logic

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

UBS00B81
A

P0444 0444
P0445 0445

EVAP canister purge volume control solenoid valve circuit open
EVAP canister purge volume control solenoid valve circuit shorted

G Harness or connectors

An excessively low voltage signal is sent

(The solenoid valve circuit is open or shorted.)

EC

to ECM through the valve

G EVAP canister purge volume control

solenoid valve

G Harness or connectors

C

An excessively high voltage signal is sent (The solenoid valve circuit is shorted.)

to ECM through the valve

G EVAP canister purge volume control

solenoid valve

D

DTC Confirmation Procedure

UBS00B82

NOTE:

E

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

Before performing the following procedure, confirm battery voltage is more than 11V at idle.

F

WITH CONSULT-II

1. Turn ignition switch ON.

G

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Start engine and let it idle for at least 13 seconds.

4. If 1st trip DTC is detected, go to EC-366, "Diagnostic Procedure"

H

.

I

WITH GST Follow the procedure "WITH CONSULT-II" above.

J
SEF058Y
K
L

M

Revision: December 2006

EC-363

2006 Sentra

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QG18DE]

Wiring Diagram

UBS00B83

Revision: December 2006

EC-364

BBWA1431E
2006 Sentra

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL
NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)
C
BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

D

G Idle speed

G Accelerator pedal: Not depressed even

slightly, after engine starting.

E

45 GY/L

EVAP canister purge volume control solenoid valve

PBIB0050E

Approximately 10V

F

[Engine is running]

G Engine speed: About 2,000 rpm (More than

G

100 seconds after starting engine)

PBIB0520E

H

[Engine is running]

[Ignition switch: OFF]

G For a few seconds after turning ignition

0 - 1.0V

I

111 W/G

ECM relay (Self shut-off)

switch OFF

[Ignition switch: OFF]

BATTERY VOLTAGE G More than a few seconds after turning igni- (11 - 14V)

J

tion switch OFF

119 R/G 120 R/G

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE

(11 - 14V)

K

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

L

M

Revision: December 2006

EC-365

2006 Sentra

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QG18DE]

Diagnostic Procedure

UBS00B84

1. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE POWER SUPPLY CIR-

CUIT

1. Turn ignition switch OFF. 2. Disconnect EVAP canister purge volume control solenoid valve
harness connector.
3. Turn ignition switch ON.

4. Check voltage between EVAP canister purge volume control solenoid valve terminal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 3. NG >> GO TO 2.

BBIA0518E

2. DETECT MALFUNCTIONING PART

SEF206W

Check the following. G Harness for open or short between EVAP canister purge volume control solenoid valve and ECM G Harness for open or short between EVAP canister purge volume control solenoid valve and ECM relay.

>> Repair harness or connectors.
3. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OUTPUT SIGNAL CIR-
CUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 45 and EVAP canister purge volume control solenoid
valve terminal 2. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK (With CONSULT-II)>>GO TO 4. OK (Without CONSULT-II)>>GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-366

2006 Sentra

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QG18DE]

4. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION A

With CONSULT-II

1. Reconnect all harness connectors disconnected.

EC

2. Start engine.

3. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode with

CONSULT-II. Check that engine speed varies according to the valve opening.

C

OK or NG

OK >> GO TO 6. NG >> GO TO 5.

D

5. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to EC-367, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> Replace EVAP canister purge volume control solenoid valve.
6. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE With CONSULT-II
Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions.

Condition (PURG VOL CONT/V value)
100%
0%

Air passage continuity between A and B
Yes
No

E
PBIB1786E
F

G H

I

UBS00B85

J

K

L

M

Without CONSULT-II
Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions.

Condition
12V direct current supply between terminals 1 and 2 No supply

Air passage continuity between A and B
Yes
No

Revision: December 2006

EC-367

PBIB0149E
PBIB0150E
2006 Sentra

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QG18DE]

Removal and Installation
EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to EM-15, "OUTER COMPONENT PARTS" .

UBS00B86

Revision: December 2006

EC-368

2006 Sentra

DTC P0447 EVAP CANISTER VENT CONTROL VALVE
DTC P0447 EVAP CANISTER VENT CONTROL VALVE
Component Description
The EVAP canister vent control valve is located on the EVAP canister and is used to seal the canister vent. This solenoid valve responds to signals from the ECM. When the ECM sends an ON signal, the coil in the solenoid valve is energized. A plunger will then move to seal the canister vent. The ability to seal the vent is necessary for the on board diagnosis of other evaporative emission control system components. This solenoid valve is used only for diagnosis, and usually remains opened. When the vent is closed, under normal purge conditions, the evaporative emission control system is depressurized and allows "EVAP Control System" diagnoses.

[QG18DE]
PFP:14935
A
UBS00B87
EC
C
D
PBIB1263E
E

F

G

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

CONDITION

VENT CONT/V

G Ignition switch: ON

On Board Diagnosis Logic

DTC No. Trouble diagnosis name

DTC detecting condition

P0447 0447

EVAP canister vent con- An improper voltage signal is sent to ECM trol valve circuit open through EVAP canister vent control valve.

H
BBIA0157E

UBS00B88

I

SPECIFICATION

J

OFF

UBS00B89
K

Possible cause

G Harness or connectors

(The valve circuit is open or shorted.)

L

G EVAP canister vent control valve

M

Revision: December 2006

EC-369

2006 Sentra

DTC P0447 EVAP CANISTER VENT CONTROL VALVE
[QG18DE]

DTC Confirmation Procedure

UBS00B8A

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm battery voltage is more than 11V at idle.

WITH CONSULT-II

1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and wait at least 8 seconds. 4. If 1st trip DTC is detected, go to EC-372, "Diagnostic Procedure"
.

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-370

2006 Sentra

DTC P0447 EVAP CANISTER VENT CONTROL VALVE Wiring Diagram

[QG18DE]
UBS00B8B
A

EC

C

D

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-371

BBWA2141E
2006 Sentra

DTC P0447 EVAP CANISTER VENT CONTROL VALVE
[QG18DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

111 W/G

ECM relay (Self shut-off)

117 L/Y
119 R/G 120 R/G

EVAP canister vent control valve
Power supply for ECM

CONDITION
[Engine is running] [Ignition switch: OFF] G For a few seconds after turning ignition
switch OFF [Ignition switch: OFF] G More than a few seconds after turning igni-
tion switch OFF
[Ignition switch: ON]
[Ignition switch: ON]

DATA (DC Voltage)
0 - 1.0V
BATTERY VOLTAGE (11 - 14V) BATTERY VOLTAGE (11 - 14V) BATTERY VOLTAGE (11 - 14V)

Diagnostic Procedure
1. INSPECTION START

UBS00B8C

1. Do you have CONSULT-II? Yes or No
Yes >> GO TO 2. No >> GO TO 3.
2. CHECK EVAP CANISTER VENT CONTROL VALVE CIRCUIT

With CONSULT-II 1. Turn ignition switch OFF and then turn ON. 2. Select "VENT CONTROL/V" in "ACTIVE TEST" mode with CONSULT-II. 3. Touch "ON/OFF" on CONSULT-II screen. 4. Check for operating sound of the valve.
Clicking noise should be heard. OK or NG
OK >> GO TO 7. NG >> GO TO 3.

PBIB1787E

Revision: December 2006

EC-372

2006 Sentra

DTC P0447 EVAP CANISTER VENT CONTROL VALVE
3. CHECK EVAP CANISTER VENT CONTROL VALVE POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect EVAP canister vent control valve harness connector. 3. Turn ignition switch ON.

[QG18DE]
A EC

C

D

4. Check voltage between EVAP canister vent control valve terminal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 5. NG >> GO TO 4.

BBIA0157E
E
F
G

H

4. DETECT MALFUNCTIONING PART

PBIB0080E
I

Check the following.

G Harness connectors F27, M59

J

G Harness connectors B1, M14

G Harness for open or short between EVAP canister vent control valve and ECM relay K

>> Repair harness or connectors.

5. CHECK EVAP CANISTER VENT CONTROL VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND

L

SHORT

1. Turn ignition switch OFF. M
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 117 and EVAP canister vent control valve terminal 2. Refer to Wiring Diagram.

Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 7. NG >> GO TO 6.

Revision: December 2006

EC-373

2006 Sentra

DTC P0447 EVAP CANISTER VENT CONTROL VALVE
6. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors B3, M16 G Harness connectors M59, F27 G Harness for open or short between EVAP canister vent control valve and ECM

[QG18DE]

>> Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK RUBBER TUBE FOR CLOGGING
1. Disconnect rubber tube connected to EVAP canister vent control valve. 2. Check the rubber tube for clogging. OK or NG
OK >> GO TO 8. NG >> Clean the rubber tube using an air blower.
8. CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to EC-374, "Component Inspection" . OK or NG
OK >> GO TO 9. NG >> Replace EVAP canister vent control valve.
9. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
EVAP CANISTER VENT CONTROL VALVE With CONSULT-II
1. Remove EVAP canister vent control valve from EVAP canister.
2. Check portion B of EVAP canister vent control valve for being rusted. If NG, replace EVAP canister vent control valve. If OK, go to next step.
3. Reconnect harness connectors disconnected.
4. Turn ignition switch ON.

UBS00B8D

PBIB1033E

Revision: December 2006

EC-374

2006 Sentra

DTC P0447 EVAP CANISTER VENT CONTROL VALVE
5. Perform "VENT CONTROL/V" in "ACTIVE TEST" mode. 6. Check air passage continuity and operation delay time.
Make sure new O-ring is installed properly.

[QG18DE]
A

Condition VENT CONTROL/V

Air passage continuity between A and B

EC

ON

No

OFF

Yes

Operation takes less than 1 second.

C

If NG, replace EVAP canister vent control valve.

If OK, go to next step.

PBIB1787E

7. Clean the air passage (Portion A to B ) of EVAP canister vent control valve using an air blower.

D

8. Perform step 6 again.

Without CONSULT-II

E

1. Remove EVAP canister vent control valve from EVAP canister.

2. Check portion B of EVAP canister vent control valve for being

rusted.

F

G

H

3. Check air passage continuity and operation delay time under the following conditions. Make sure new O-ring is installed properly.

PBIB1033E
I
J

Condition

Air passage continuity between A and B

12V direct current supply between terminals 1 and 2

No

K

OFF

Yes

Operation takes less than 1 second.
If NG, replace EVAP canister vent control valve. If OK, go to next step.

L
PBIB1034E

4. Clean the air passage (Portion A to B ) of EVAP canister vent control valve using an air blower.

M

5. Perform step 3 again.

Revision: December 2006

EC-375

2006 Sentra

DTC P0448 EVAP CANISTER VENT CONTROL VALVE
DTC P0448 EVAP CANISTER VENT CONTROL VALVE
Component Description
The EVAP canister vent control valve is located on the EVAP canister and is used to seal the canister vent. This solenoid valve responds to signals from the ECM. When the ECM sends an ON signal, the coil in the solenoid valve is energized. A plunger will then move to seal the canister vent. The ability to seal the vent is necessary for the on board diagnosis of other evaporative emission control system components. This solenoid valve is used only for diagnosis, and usually remains opened. When the vent is closed, under normal purge conditions, the evaporative emission control system is depressurized and allows "EVAP Control System" diagnoses.

[QG18DE]
PFP:16935
UBS00BF0
PBIB1263E

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

CONDITION

VENT CONT/V

G Ignition switch: ON

On Board Diagnosis Logic

DTC No. Trouble diagnosis name

DTC detecting condition

P0448 0448

EVAP canister vent con- EVAP canister vent control valve remains

trol valve close

closed under specified driving conditions.

BBIA0157E
UBS00BF1
SPECIFICATION OFF
UBS00BF2
Possible cause G EVAP canister vent control valve G EVAP control system pressure sensor
and the circuit G Blocked rubber tube to EVAP canister
vent control valve G EVAP canister is saturated with water

Revision: December 2006

EC-376

2006 Sentra

DTC P0448 EVAP CANISTER VENT CONTROL VALVE
[QG18DE]

DTC Confirmation Procedure
CAUTION: Always drive vehicle at a safe speed.

UBS00BF3
A

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

EC

least 10 seconds before conducting the next test.

C

D

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-377

2006 Sentra

DTC P0448 EVAP CANISTER VENT CONTROL VALVE
[QG18DE]

WITH CONSULT-II

1. Turn ignition switch ON and wait at least 5 seconds.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.

4. Start engine and let it idle for at least 1 minute.

5. Repeat next procedures 3 times.

a. Increase the engine speed up to 3,000 to 3,500 rpm and keep it for 2 minutes and 50 seconds to 3 minutes. Never exceed 3 minutes.

b. Fully released accelerator pedal and keep engine idle for about 5 seconds.

6. If 1st trip DTC is detected, go to EC-380, "Diagnostic Procedure" . If 1st trip DTC is not detected, go to the next step.

SEF058Y

7. Repeat next procedure 20 times.

a. Quickly increase the engine speed up to 4,000 to 4,500 rpm or more and keep it for 25 to 30 seconds.

b. Fully released accelerator pedal and keep engine idle for at least 35 seconds.

8. If 1st trip DTC is detected, go to EC-380, "Diagnostic Procedure" . WITH GST
Follow the procedure "WITH CONSULT-II" above.

PBIB0972E

Revision: December 2006

EC-378

2006 Sentra

DTC P0448 EVAP CANISTER VENT CONTROL VALVE Wiring Diagram

[QG18DE]
UBS00BF4
A

EC

C

D

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-379

BBWA2141E
2006 Sentra

DTC P0448 EVAP CANISTER VENT CONTROL VALVE
[QG18DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

111 W/G
117 L/Y 119 R/G 120 R/G

ECM relay (Self shut-off)
EVAP canister vent control valve Power supply for ECM

[Engine is running] [Ignition switch: OFF]
G For a few seconds after turning ignition switch OFF

0 - 1.0V

[Ignition switch: OFF]
G More than a few seconds after turning ignition switch OFF

BATTERY VOLTAGE (11 - 14V)

[Ignition switch: ON]

BATTERY VOLTAGE (11 - 14V)

[Ignition switch: ON]

BATTERY VOLTAGE (11 - 14V)

Diagnostic Procedure
1. CHECK RUBBER TUBE

UBS00BF5

1. Turn ignition switch OFF. 2. Disconnect rubber tube connected to EVAP canister vent control valve. 3. Check the rubber tube for clogging. OK or NG
OK >> GO TO 2. NG >> Clean rubber tube using an air blower.

2. CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to EC-382, "Component Inspection" . OK or NG
OK >> GO TO 3. NG >> Replace EVAP canister vent control valve.

BBIA0157E

Revision: December 2006

EC-380

2006 Sentra

DTC P0448 EVAP CANISTER VENT CONTROL VALVE
[QG18DE]

3. CHECK IF EVAP CANISTER SATURATED WITH WATER A

1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.

2. Check if water will drain from the EVAP canister.

EC

Yes or No

Yes >> GO TO 4.

No >> GO TO 6.

C

D

PBIB1213E

E

4. CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor F

attached.

The weight should be less than 1.9 kg (4.2 lb).

OK or NG

G

OK >> GO TO 6.
NG >> GO TO 5. H
5. DETECT MALFUNCTIONING PART

Check the following.

I

G EVAP canister for damage

G EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

J >> Repair hose or replace EVAP canister.

6. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

K

1. Disconnect EVAP control system pressure sensor harness con-

nector.

2. Check connectors for water.

L

Water should not exist. M

OK or NG OK >> GO TO 7. NG >> Replace EVAP control system pressure sensor.
7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-399, "Component Inspection" . OK or NG
OK >> GO TO 8. NG >> Replace EVAP control system pressure sensor.

Revision: December 2006

EC-381

BBIA0157E
2006 Sentra

DTC P0448 EVAP CANISTER VENT CONTROL VALVE
8. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Component Inspection
EVAP CANISTER VENT CONTROL VALVE With CONSULT-II
1. Remove EVAP canister vent control valve from EVAP canister. 2. Check portion B of EVAP canister vent control valve for being
rusted. If NG, replace EVAP canister vent control valve. If OK, go to next step. 3. Reconnect harness connectors disconnected. 4. Turn ignition switch ON.

[QG18DE]
UBS00BF6

5. Perform "VENT CONTROL/V" in "ACTIVE TEST" mode. 6. Check air passage continuity and operation delay time.

Condition VENT CONTROL/V ON OFF

Air passage continuity between A and B No Yes

Operation takes less than 1 second. Make sure new O-ring is installed properly. If NG, replace EVAP canister vent control valve. If OK, go to next step.
7. Clean the air passage (Portion A to B ) of EVAP canister vent control valve using an air blower.
8. Perform step 5 again.
Without CONSULT-II 1. Remove EVAP canister vent control valve from EVAP canister.
2. Check portion B of EVAP canister vent control valve for being rusted.

PBIB1033E PBIB1787E

Revision: December 2006

EC-382

PBIB1033E
2006 Sentra

DTC P0448 EVAP CANISTER VENT CONTROL VALVE
3. Check air passage continuity and operation delay time under the following conditions.

[QG18DE]
A

Condition

Air passage continuity between A and B

12V direct current supply between terminals 1 and 2

No

EC

OFF

Yes

Operation takes less than 1 second.

C

Make sure new O-ring is installed properly.

If NG, replace EVAP canister vent control valve. If OK, go to next step.

PBIB1034E
D

4. Clean the air passage (Portion A to B ) of EVAP canister vent control valve using an air blower.

5. Perform step 3 again.

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-383

2006 Sentra

DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]

DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

PFP:22365

Component Description

UBS00ISB

The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the ECM increases as pressure increases.

BBIA0157E

PBIB1207E

CONSULT-II Reference Value in Data Monitor Mode

UBS00ISC

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

EVAP SYS PRES G Ignition switch: ON

Approx. 1.8 - 4.8V

On Board Diagnosis Logic

UBS00ISD

NOTE: If DTC P0451 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to EC-440, "DTC P0643 SENSOR POWER SUPPLY"

DTC No.
P0451 0451

Trouble diagnosis name

DTC detecting condition

EVAP control system pressure sensor performance

ECM detects a sloshing signal from the EVAP control system pressure sensor

Possible cause
G Harness or connectors G EVAP control system pressure sensor

DTC Confirmation Procedure

UBS00ISE

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II 1. Turn ignition switch OFF and wait at least 10 seconds.

Revision: December 2006

EC-384

2006 Sentra

DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]

2. Turn ignition switch ON and select "DATA MONITOR" mode with

CONSULT-II.

A

3. Start engine and wait at least 40 seconds.

NOTE:

Do not depress accelerator pedal even slightly.

EC

If 1st trip DTC is detected, go to EC-385, "Diagnostic Procedure"

.

C

WITH GST Follow the procedure "WITH CONSULT-II" above.
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

SEF194Y
D
E
UBS00ISF
F
G

H

I

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER
1. Disconnect EVAP control system pressure sensor harness connector.
2. Check sensor harness connector for water.
Water should not exist. OK or NG
OK >> GO TO 3. NG >> Repair or replace harness connector.
3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-386, "Component Inspection" . OK or NG
OK >> GO TO 4. NG >> Replace EVAP control system pressure sensor.

BBIA0515E

J

K

L

M

BBIA0157E

Revision: December 2006

EC-385

2006 Sentra

DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]
4. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . For wiring diagram, refer to EC-389 .

>> INSPECTION END

Component Inspection
EVAP CONTROL SYSTEM PRESSURE SENSOR

UBS00ISG

1. Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister. Do not reuse the O-ring, replace it with a new one.

2. Install a vacuum pump to EVAP control system pressure sensor.

3. Turn ignition switch ON and check output voltage between ECM terminal 32 and ground under the following conditions.

Applied vacuum kPa (mmHg, inHg)
Not applied
-26.7 (-200, -7.87)

Voltage V
1.8 - 4.8 2.1 to 2.5V lower than above value

CAUTION: G Always calibrate the vacuum pump gauge when using it.
G Do not apply below -93.3 kPa (-700 mmHg, -27.56 inHg) or pressure over 101.3 kPa (760 mmHg, 29.92 inHg).
4. If NG, replace EVAP control system pressure sensor.

PBIB1200E

Revision: December 2006

EC-386

2006 Sentra

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR Component Description

PFP:25085
A
UBS00B8E

The EVAP control system pressure sensor detects pressure in the

purge line. The sensor output voltage to the ECM increases as pres-

EC

sure increases.

C

D
BBIA0157E
E

F

G

H
PBIB1207E

CONSULT-II Reference Value in Data Monitor Mode

UBS00B8F

I

Specification data are reference values.

MONITOR ITEM EVAP SYS PRES

G Ignition switch: ON

CONDITION

SPECIFICATION

J

Approx. 1.8 - 4.8V

On Board Diagnosis Logic

UBS00B8G
K

NOTE:

If DTC P0452 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to

EC-440, "DTC P0643 SENSOR POWER SUPPLY" .

L

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0452 0452

EVAP control system pressure sensor low input

An excessively low voltage from the sensor is sent to ECM.

G Harness or connectors (The sensor circuit is open or shorted.)
G EVAP control system pressure sensor

M

Revision: December 2006

EC-387

2006 Sentra

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]

DTC Confirmation Procedure

UBS00B8H

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Always perform test at a temperature of 0°C (32°F) or more.

WITH CONSULT-II

1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Turn ignition switch ON. 4. Select "DATA MONITOR" mode with CONSULT-II. 5. Make sure that "FUEL T/TMP SE" is more than 0°C (32°F). 6. Start engine and wait at least 20 seconds. 7. If 1st trip DTC is detected, go to EC-390, "Diagnostic Procedure"
.

WITH GST
1. Start engine and warm it up to normal operating temperature. 2. Check that voltage between ECM terminal 107 (Fuel tank tem-
perature sensor signal) and ground is less than 4.2V. 3. Turn ignition switch OFF and wait at least 10 seconds. 4. Start engine and wait at least 20 seconds. 5. Select Service $07 with GST. 6. If 1st trip DTC is detected, go to EC-390, "Diagnostic Procedure"
.

SEF194Y

PBIB1110E

Revision: December 2006

EC-388

2006 Sentra

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]

Wiring Diagram

UBS00B8I
A

EC

C

D

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-389

BBWA1433E
2006 Sentra

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

32 L

EVAP control system pressure sensor

[Ignition switch: ON]

Approximately 1.8 - 4.8V

48 R/W

Sensor power supply (EVAP control system pressure sensor)

[Ignition switch: ON]

Approximately 5V

67 B/W

Sensor ground

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS00B8J

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. CHECK CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
2. Check sensor harness connector for water.
Water should not exist.
OK or NG OK >> GO TO 3. NG >> Repair or replace harness connector.

Revision: December 2006

EC-390

BBIA0515E
BBIA0157E
2006 Sentra

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]

3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT A

1. Turn ignition switch ON.

2. Check voltage between EVAP control system pressure sensor

terminal 3 and ground with CONSULT-II or tester.

EC

Voltage: Approximately 5V

OK or NG

C

OK >> GO TO 5.

NG >> GO TO 4.

D

4. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors B1, M14 G Harness connectors M59, F27 G Harness for open or short between EVAP control system pressure sensor and ECM

PBIB0138E
E
F
G

>> Repair harness or connectors.

5. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND

H

SHORT

1. Turn ignition switch OFF.

I

2. Disconnect ECM harness connector.

3. Disconnect TCM harness connector. J
4. Check harness continuity between EVAP control system pressure sensor terminal 1 and ECM terminal 67, TCM terminal 42. Refer to Wiring Diagram. K Continuity should exist.

5. Also check harness for short to ground and short to power.

OK or NG

L

OK >> GO TO 7.

NG >> GO TO 6.

6. DETECT MALFUNCTIONING PART

M

Check the following. G Harness connectors B1, M14 G Harness connectors M59, F27 G Harness for open or short between EVAP control system pressure sensor and TCM G Harness for open or short between EVAP control system pressure sensor and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-391

2006 Sentra

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]
7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND
SHORT
1. Check harness continuity between ECM terminal 32 and EVAP control system pressure sensor terminal 2. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 9. NG >> GO TO 8.
8. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors B1, M14 G Harness connectors M59, F27 G Harness for open or short between ECM and EVAP control system pressure sensor

>> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-392, "Component Inspection" . OK or NG
OK >> GO TO 10. NG >> Replace EVAP control system pressure sensor.
10. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Component Inspection
EVAP CONTROL SYSTEM PRESSURE SENSOR

UBS00B8K

1. Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister. Do not reuse the O-ring, replace it with a new one.

2. Install a vacuum pump to EVAP control system pressure sensor.

3. Turn ignition switch ON and check output voltage between ECM terminal 32 and ground under the following conditions.

Applied vacuum kPa (mmHg, inHg)
Not applied
-26.7 (-200, -7.87)

Voltage V
1.8 - 4.8 2.1 to 2.5V lower than above value

CAUTION: G Always calibrate the vacuum pump gauge when using it.
G Do not apply below -93.3 kPa (-700 mmHg, -27.56 inHg) or pressure over 101.3 kPa (760 mmHg, 29.92 inHg).
4. If NG, replace EVAP control system pressure sensor.

PBIB1200E

Revision: December 2006

EC-392

2006 Sentra

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR Component Description

PFP:25085
A
UBS00B8L

The EVAP control system pressure sensor detects pressure in the

purge line. The sensor output voltage to the ECM increases as pres-

EC

sure increases.

C

D
BBIA0157E
E

F

G

H
PBIB1207E

CONSULT-II Reference Value in Data Monitor Mode

UBS00B8M

I

Specification data are reference values.

MONITOR ITEM EVAP SYS PRES

G Ignition switch: ON

CONDITION

SPECIFICATION

J

Approx. 1.8 - 4.8V

On Board Diagnosis Logic

UBS00B8N
K

NOTE:

If DTC P0453 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to

EC-440, "DTC P0643 SENSOR POWER SUPPLY" .

L

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0453 0453

EVAP control system pressure sensor high input

G Harness or connectors

(The sensor circuit is open or shorted.)

M

An excessively high voltage from the sensor is sent to ECM.

G EVAP control system pressure sensor G EVAP canister vent control valve G EVAP canister

G Rubber hose to EVAP canister vent control valve

Revision: December 2006

EC-393

2006 Sentra

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]

DTC Confirmation Procedure

UBS00B8O

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Always perform test at a temperature of 0°C (32°F) or more.

WITH CONSULT-II

1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Turn ignition switch ON. 4. Select "DATA MONITOR" mode with CONSULT-II. 5. Make sure that "FUEL T/TMP SE" is more than 0°C (32°F). 6. Wait at least 10 seconds. 7. If 1st trip DTC is detected, go to EC-396, "Diagnostic Procedure"
.

WITH GST
1. Start engine and warm it up to normal operating temperature. 2. Check that voltage between ECM terminal 107 (Fuel tank tem-
perature sensor signal) and ground is less than 4.2V. 3. Turn ignition switch OFF and wait at least 10 seconds. 4. Wait at least 10 seconds. 5. Select Service $07 with GST. 6. If 1st trip DTC is detected, go to EC-396, "Diagnostic Procedure"
.

SEF194Y

PBIB1110E

Revision: December 2006

EC-394

2006 Sentra

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]

Wiring Diagram

UBS00B8P
A

EC

C

D

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-395

BBWA1433E
2006 Sentra

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

32 L

EVAP control system pressure sensor

[Ignition switch: ON]

Approximately 1.8 - 4.8V

48 R/W

Sensor power supply (EVAP control system pres- [Ignition switch: ON] sure sensor)

Approximately 5V

67 B/W

Sensor ground

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS00B8Q

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. CHECK CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
2. Check sensor harness connector for water.
Water should not exist.
OK or NG OK >> GO TO 3. NG >> Repair or replace harness connector.

Revision: December 2006

EC-396

BBIA0515E
BBIA0157E
2006 Sentra

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]

3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT A

1. Turn ignition switch ON.

2. Check voltage between EVAP control system pressure sensor

terminal 3 and ground with CONSULT-II or tester.

EC

Voltage: Approximately 5V

OK or NG

C

OK >> GO TO 5.

NG >> GO TO 4.

D

4. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors B1, M14 G Harness connectors M59, F27 G Harness for open or short between EVAP control system pressure sensor and ECM

PBIB0138E
E
F
G

>> Repair harness or connectors.

5. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND

H

SHORT

1. Turn ignition switch OFF.

I

2. Disconnect ECM harness connector.

3. Disconnect TCM harness connector. J
4. Check harness continuity between EVAP control system pressure sensor terminal 1 and ECM terminal 67, TCM terminal 42. Refer to Wiring Diagram. K Continuity should exist.

5. Also check harness for short to ground and short to power.

OK or NG

L

OK >> GO TO 7.

NG >> GO TO 6.

6. DETECT MALFUNCTIONING PART

M

Check the following. G Harness connectors B1, M14 G Harness connectors M58, F27 G Harness for open or short between EVAP control system pressure sensor and TCM G Harness for open or short between EVAP control system pressure sensor and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-397

2006 Sentra

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]
7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND
SHORT
1. Check harness continuity between ECM terminal 32 and EVAP control system pressure sensor terminal 2. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 9. NG >> GO TO 8.
8. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors B1, M14 G Harness connectors M58, F27 G Harness for open or short between ECM and EVAP control system pressure sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK RUBBER TUBE
1. Disconnect rubber tube connected to EVAP canister vent control valve. 2. Check the rubber tube for clogging, vent and kinked. OK or NG
OK >> GO TO 10. NG >> Clean the rubber tube using an air blower, repair or replace rubber tube.
10. CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to EC-374, "Component Inspection" . OK or NG
OK >> GO TO 11. NG >> Replace EVAP canister vent control valve.
11. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-399, "Component Inspection" . OK or NG
OK >> GO TO 12. NG >> Replace EVAP control system pressure sensor.

Revision: December 2006

EC-398

2006 Sentra

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QG18DE]

12. CHECK IF EVAP CANISTER SATURATED WITH WATER A

1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.

2. Check if water will drain from the EVAP canister.

EC

Yes or No

Yes >> GO TO 13.

No >> GO TO 15.

C

D

PBIB1213E

E

13. CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor F

attached.

The weight should be less than 1.9 kg (4.2 lb).

OK or NG

G

OK >> GO TO 15.
NG >> GO TO 14. H
14. DETECT MALFUNCTIONING PART

Check the following.

I

G EVAP canister for damage

G EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

J

>> Repair hose or replace EVAP canister.

15. CHECK INTERMITTENT INCIDENT

K

Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

L >> INSPECTION END

Component Inspection

UBS00B8R

EVAP CONTROL SYSTEM PRESSURE SENSOR

M

1. Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister.

Do not reuse the O-ring, replace it with a new one.

2. Install a vacuum pump to EVAP control system pressure sensor.

3. Turn ignition switch ON and check output voltage between ECM terminal 32 and ground under the following conditions.

Applied vacuum kPa (mmHg, inHg)
Not applied
-26.7 (-200, -7.87)

Voltage V
1.8 - 4.8 2.1 to 2.5V lower than above value

CAUTION: G Always calibrate the vacuum pump gauge when using it.
G Do not apply below -93.3 kPa (-700 mmHg, -27.56 inHg) or pressure over 101.3 kPa (760 mmHg, 29.92 inHg).
4. If NG, replace EVAP control system pressure sensor.

PBIB1200E

Revision: December 2006

EC-399

2006 Sentra

DTC P0455 EVAP CONTROL SYSTEM

[QG18DE]

DTC P0455 EVAP CONTROL SYSTEM

PFP:14950

On Board Diagnosis Logic

UBS00B8S

This diagnosis detects a very large leak (fuel filler cap fell off etc.) in EVAP system between the fuel tank and EVAP canister purge volume control solenoid valve.

PBIB1209E

DTC No.
P0455 0455

Trouble diagnosis name

DTC detecting condition

EVAP control system gross leak detected

EVAP control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly.

Possible cause
G Fuel filler cap remains open or fails to close. G Incorrect fuel tank vacuum relief valve G Incorrect fuel filler cap used G Foreign matter caught in fuel filler cap. G Leak is in line between intake manifold and
EVAP canister purge volume control solenoid valve. G Foreign matter caught in EVAP canister vent control valve. G EVAP canister or fuel tank leaks G EVAP purge line (pipe and rubber tube) leaks G EVAP purge line rubber tube bent. G Loose or disconnected rubber tube G EVAP canister vent control valve and the circuit G EVAP canister purge volume control solenoid valve and the circuit G Fuel tank temperature sensor G O-ring of EVAP canister vent control valve is missing or damaged. G EVAP control system pressure sensor G Refueling control valve G ORVR system leaks

CAUTION: G Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used,
the MIL may come on.
G If the fuel filler cap is not tightened properly, the MIL may come on.
G Use only a genuine NISSAN rubber tube as a replacement.

Revision: December 2006

EC-400

2006 Sentra

DTC P0455 EVAP CONTROL SYSTEM

[QG18DE]

DTC Confirmation Procedure
CAUTION: Never remove fuel filler cap during the DTC Confirmation Procedure.

UBS00B8T
A

NOTE: G Make sure that EVAP hose are connected to EVAP canister purge volume control solenoid valve EC
properly.

G If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait

at least 10 seconds before conducting the next test.

C

TESTING CONDITION:

G Perform "DTC WORK SUPPORT" when the fuel level is between 1/4 to 3/4 full, and vehicle is

placed on flat level surface.

D

G Open engine hood before conducting the following procedure.

WITH CONSULT-II

E

1. Tighten fuel filler cap securely until ratcheting sound is heard.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

F

4. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.

5. Make sure that the following conditions are met.

COOLAN TEMP/S: 0 - 70°C (32 - 158°F)

G

INT/A TEMP SE: 0 - 60°C (32 - 140°F)

6. Select "EVP SML LEAK P0442/P1442" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode

with CONSULT-II.

H

Follow the instruction displayed.

I

J

K

NOTE:

PBIB0829E

L

If the engine speed cannot be maintained within the range displayed on the CONSULT-II screen, go to

EC-73, "Basic Inspection" . M

7. Make sure that OK is displayed. If NG is displayed, select "SELF-DIAG RESULTS" mode with CONSULT-II and make sure that "EVAP GROSS LEAK [P0455]" is displayed. If it is displayed, refer to EC-402, "Diagnostic Procedure" . If P0442 is displayed, perform Diagnostic Procedure for DTC P0442, EC-348, "Diagnostic Procedure" .

WITH GST
NOTE: Be sure to read the explanation of EC-60, "Driving Pattern" before driving vehicle.

Revision: December 2006

EC-401

SEC763C
2006 Sentra

DTC P0455 EVAP CONTROL SYSTEM

[QG18DE]

1. Start engine. 2. Drive vehicle according to EC-60, "Driving Pattern" . 3. Stop vehicle. 4. Turn ignition switch OFF and wait at least 10 seconds. 5. Select Service $07 with GST.
G If P0455 is displayed on the screen, go to EC-402, "Diagnostic Procedure" . G If P0442 is displayed on the screen, go to DTC P0442, EC-348, "Diagnostic Procedure" . G If P0441 is displayed on the screen, go to DTC P0441, EC-342, "Diagnostic Procedure" .

Diagnostic Procedure
1. CHECK FUEL FILLER CAP DESIGN

UBS00B8U

1. Turn ignition switch OFF. 2. Check for genuine NISSAN fuel filler cap design. OK or NG
OK >> GO TO 2. NG >> Replace with genuine NISSAN fuel filler cap.

2. CHECK FUEL FILLER CAP INSTALLATION

SEF915U

Check that the cap is tightened properly by rotating the cap clockwise. OK or NG
OK >> GO TO 3. NG >> 1. Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.
2. Retighten until ratcheting sound is heard.
3. CHECK FUEL FILLER CAP FUNCTION

Check for air releasing sound while opening the fuel filler cap. OK or NG
OK >> GO TO 5. NG >> GO TO 4.
4. CHECK FUEL TANK VACUUM RELIEF VALVE

Refer to EC-38, "Component Inspection" . OK or NG
OK >> GO TO 5. NG >> Replace fuel filler cap with a genuine one.
5. CHECK EVAP PURGE LINE

Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks, improper connection or disconnection. Refer to EC-35, "EVAPORATIVE EMISSION SYSTEM" .
OK or NG
OK >> GO TO 6. NG >> Repair or reconnect the hose.

Revision: December 2006

EC-402

2006 Sentra

DTC P0455 EVAP CONTROL SYSTEM
6. CLEAN EVAP PURGE LINE
Clean EVAP purge line (pipe and rubber tube) using air blower. >> GO TO 7.
7. CHECK EVAP CANISTER VENT CONTROL VALVE
Check the following. G EVAP canister vent control is installed properly.
Refer to EC-39, "EVAP CANISTER VENT CONTROL VALVE" G EVAP canister vent control valve.
Refer to EC-374, "Component Inspection" OK or NG
OK >> GO TO 8. NG >> Repair or replace EVAP canister vent control valve and O-ring.
8. INSTALL THE PRESSURE PUMP
To locate the EVAP leak, install EVAP service port adapter and pressure pump to EVAP service port securely. NOTE: Improper installation of the EVAP service port adapter to the EVAP service port may cause leaking.
Models with CONSULT-II>>GO TO 9. Models without CONSULT-II>>GO TO 10.

[QG18DE]
A EC
C D E F G H I
BBIA0517E
J K L M
SEF916U

Revision: December 2006

EC-403

2006 Sentra

DTC P0455 EVAP CONTROL SYSTEM
9. CHECK FOR EVAP LEAK
With CONSULT-II 1. Turn ignition switch ON. 2. Select "EVAP SYSTEM CLOSE" of "WORK SUPPORT" mode
with CONSULT-II. 3. Touch "START" and apply pressure into the EVAP line until the
pressure indicator reaches the middle of the bar graph. NOTE: G Never use compressed air or a high pressure pump. G Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pres-
sure in the system.
4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. Refer to EC-36, "EVAPORATIVE EMISSION LINE DRAWING" .
OK or NG OK >> GO TO 11. NG >> Repair or replace.
10. CHECK FOR EVAP LEAK
Without CONSULT-II 1. Turn ignition switch OFF. 2. Apply 12 volts DC to EVAP canister vent control valve. The
valve will close. (Continue to apply 12 volts until the end of test.) 3. Pressurize the EVAP line using pressure pump with 1.3 to 2.7
kPa (10 to 20 mmHg, 0.39 to 0.79 inHg), then remove pump and EVAP service port adapter. NOTE: G Never use compressed air or a high pressure pump. G Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pres-
sure in the system.
4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. Refer to EC-36, "EVAPORATIVE EMISSION LINE DRAWING" .
OK or NG OK >> GO TO 12. NG >> Repair or replace.

Revision: December 2006

EC-404

[QG18DE]
PEF917U SEF200U
BBIA0157E SEF200U
2006 Sentra

DTC P0455 EVAP CONTROL SYSTEM

[QG18DE]

11. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION A

With CONSULT-II

1. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.

EC

2. Start engine.

3. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode.

4. Touch "Qu" on CONSULT-II screen to increase "PURG VOL

C

CONT/V" opening to 100%.

5. Check vacuum hose for vacuum when revving engine up to

2,000 rpm.

D

Vacuum should exist.

OK or NG
OK >> GO TO 14. NG >> GO TO 13.

E
PBIB1786E

12. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

F

Without CONSULT-II

1. Start engine and warm it up to normal operating temperature.

G

2. Stop engine.

3. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.

H

4. Start engine and let it idle for at least 80 seconds.

5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

Vacuum should exist.

I

OK or NG

OK >> GO TO 15.

J

NG >> GO TO 13.

13. CHECK VACUUM HOSE K

Check vacuum hoses for clogging or disconnection. Refer to EC-104, "Vacuum Hose Drawing" .

OK or NG

OK (With CONSULT-II) >>GO TO 14.

L

OK (Without CONSULT-II) >>GO TO 15.

NG >> Repair or reconnect the hose.

14. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

M

With CONSULT-II
1. Start engine.
2. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode with CONSULT-II. Check that engine speed varies according to the valve opening.
OK or NG
OK >> GO TO 16. NG >> GO TO 15.

Revision: December 2006

EC-405

PBIB1786E
2006 Sentra

DTC P0455 EVAP CONTROL SYSTEM
15. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

[QG18DE]

Refer to EC-367, "Component Inspection" . OK or NG
OK >> GO TO 16. NG >> Replace EVAP canister purge volume control solenoid valve.
16. CHECK FUEL TANK TEMPERATURE SENSOR

Refer to EC-301, "Component Inspection" . OK or NG
OK >> GO TO 17. NG >> Replace fuel level sensor unit.
17. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to EC-386, "Component Inspection" . OK or NG
OK >> GO TO 18. NG >> Replace EVAP control system pressure sensor.
18. CHECK EVAP/ORVR VAPOR LINE

Check refueling EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper connection. For location, refer to EC-42, "ON BOARD REFUELING VAPOR RECOVERY (ORVR)" . OK or NG
OK >> GO TO 19. >> Repair or replace hoses and tubes.
19. CHECK SIGNAL LINE AND RECIRCULATION LINE

Check signal line and recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, looseness and improper connection. OK or NG
OK >> GO TO 20. >> Repair or replace hoses, tubes or filler neck tube.
20. CHECK REFUELING CONTROL VALVE

Refer to EC-47, "REFUELING CONTROL VALVE" . OK or NG
OK >> GO TO 21. >> Replace refueling control valve with fuel tank.
21. CHECK INTERMITTENT INCIDENT

Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-406

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM

[QG18DE]

DTC P0456 EVAP CONTROL SYSTEM On Board Diagnosis Logic

PFP:14950
A
UBS00B8V

This diagnosis detects very small leaks in the EVAP line between fuel tank and EVAP canister purge volume

control solenoid valve, using the intake manifold vacuum in the same way as conventional EVAP small leak EC

diagnosis.

If ECM judges a leak which corresponds to a very small leak, the very small leak P0456 will be detected.

If ECM judges a leak equivalent to a small leak, EVAP small leak P0442 will be detected.

If ECM judges there are no leaks, the diagnosis will be OK.

C

D

E

F

G

H

PBIB1209E

I

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

G Incorrect fuel tank vacuum relief valve

J

G Incorrect fuel filler cap used

G Fuel filler cap remains open or fails to close.

G Foreign matter caught in fuel filler cap.

K

G Leak is in line between intake manifold and EVAP

canister purge volume control solenoid valve.

G Foreign matter caught in EVAP canister vent con-

L

trol valve.

G EVAP canister or fuel tank leaks

G EVAP purge line (pipe and rubber tube) leaks

M

P0456 0456

Evaporative emission control system very small leak (negative pressure check)

G EVAP system has a very small leak.
G EVAP system does not operate properly.

G EVAP purge line rubber tube bent G Loose or disconnected rubber tube G EVAP canister vent control valve and the circuit G EVAP canister purge volume control solenoid
valve and the circuit

G Fuel tank temperature sensor

G O-ring of EVAP canister vent control valve is missing or damaged

G EVAP canister is saturated with water

G EVAP control system pressure sensor

G Refueling control valve

G ORVR system leaks

G Fuel level sensor and the circuit

G Foreign matter caught in EVAP canister purge volume control solenoid valve

Revision: December 2006

EC-407

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM

[QG18DE]

CAUTION: G Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used,
the MIL may come on.
G If the fuel filler cap is not tightened properly, the MIL may come on.
G Use only a genuine NISSAN rubber tube as a replacement.

DTC Confirmation Procedure

UBS00B8W

NOTE: G If DTC P0456 is displayed with P0442, perform first trouble diagnosis for DTC P0456. G After repair, make sure that the hoses and clips are installed properly. G If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait
at least 10 seconds before conducting the next test. TESTING CONDITION: G Open engine hood before conducting following procedure. G If any of following conditions are met just before the DTC confirmation procedure, leave the vehi-
cle for more than 1 hour. ­ Fuel filler cap is removed. ­ Refilled or drained the fuel. ­ EVAP component parts is/are removed. G Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

WITH CONSULT-II
1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.
2. Make sure the following conditions are met. FUEL LEVEL SE: 0.25 - 1.4V COOLAN TEMP/S: 0 - 32°C (32 - 90°F) FUEL T/TMP SE: 0 - 35°C (32 - 95°F) INT A/TEMP SE: More than 0°C (32°F) If NG, turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle) or refilling/draining fuel until the output voltage condition of the "FUEL LEVEL SE" meets within the range above and leave the vehicle for more than 1 hour. Then start from step 1).
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Select "EVP V/S LEAK P0456/P1456" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT-II. Follow the instruction displayed.

PBIB0837E
6. Make sure that OK is displayed. If NG is displayed, refer to EC-410, "Diagnostic Procedure" . NOTE: G If the engine speed cannot be maintained within the range displayed on CONSULT-II screen, go to EC-73, "Basic Inspection" . G Make sure that EVAP hoses are connected to EVAP canister purge volume control solenoid valve properly.

Revision: December 2006

EC-408

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM

[QG18DE]

Overall Function Check
WITH GST

UBS00B8X
A

Use this procedure to check the overall function of the EVAP very small leak function. During this check, a

DTC might not be confirmed.

CAUTION:

EC

G Never use compressed air, doing so may damage the EVAP system.

G Do not start engine.

G Do not exceeded 4.12 kPa (0.042 kg/cm2 , 0.6 psi).

C

1. Attach the EVAP service port adapter securely to the EVAP service port. D

E

2. Set the pressure pump and a hose.
3. Also set a vacuum gauge via 3-way connector and a hose.
4. Turn ignition switch ON.
5. Connect GST and select "Service $08".
6. Using Service $08 control the EVAP canister vent control valve (close).
7. Apply pressure and make sure the following conditions are satisfied. Pressure to be applied: 2.7 kPa (20 mmHg, 0.79 inHg) Time to be waited after the pressure drawn in to the EVAP system and the pressure to be dropped: 60 seconds and the pressure should not be dropped more than 0.4 kPa (3 mmHg, 0.12 inHg). If NG, go to EC-410, "Diagnostic Procedure" . If OK, go to next step.
8. Disconnect GST.
9. Start engine and warm it up to normal operating temperature.
10. Turn ignition switch OFF and wait at least 10 seconds.
11. Restart engine and let it idle for 90 seconds.
12. Keep engine speed at 2,000 rpm for 30 seconds.
13. Turn ignition switch OFF.
NOTE: For more information, refer to GST instruction manual.

F
BBIA0517E
G
H
I
J
SEF462UI
K
L
M

Revision: December 2006

EC-409

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM
Diagnostic Procedure
1. CHECK FUEL FILLER CAP DESIGN
1. Turn ignition switch OFF. 2. Check for genuine NISSAN fuel filler cap design. OK or NG
OK >> GO TO 2. NG >> Replace with genuine NISSAN fuel filler cap.

[QG18DE]
UBS00B8Y

2. CHECK FUEL FILLER CAP INSTALLATION
Check that the cap is tightened properly by rotating the cap clockwise. OK or NG
OK >> GO TO 3. NG >> 1. Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.
2. Retighten until ratcheting sound is heard.
3. CHECK FUEL FILLER CAP FUNCTION
Check for air releasing sound while opening the fuel filler cap. OK or NG
OK >> GO TO 5. NG >> GO TO 4.
4. CHECK FUEL TANK VACUUM RELIEF VALVE
Refer to EC-38, "FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FULLER CAP)" . OK or NG
OK >> GO TO 5. NG >> Replace fuel filler cap with a genuine one.

SEF915U

Revision: December 2006

EC-410

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM
5. INSTALL THE PRESSURE PUMP
To locate the EVAP leak, install EVAP service port adapter and pressure pump to EVAP service port securely. NOTE: Improper installation of the EVAP service port adapter to the EVAP service port may cause leaking.

Models with CONSULT-II>>GO TO 6. Models without CONSULT-II>>GO TO 7.
6. CHECK FOR EVAP LEAK
With CONSULT-II 1. Turn ignition switch ON. 2. Select "EVAP SYSTEM CLOSE" of "WORK SUPPORT" mode with CONSULT-II. 3. Touch "START" and apply pressure into the EVAP line until the
pressure indicator reaches the middle of the bar graph. NOTE: G Never use compressed air or a high pressure pump. G Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pres-
sure in the system.
4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. Refer to EC-36, "EVAPORATIVE EMISSION LINE DRAWING" .
OK or NG OK >> GO TO 8. NG >> Repair or replace.

Revision: December 2006

EC-411

[QG18DE]
A

EC

C

D
BBIA0517E
E

F

G

SEF916U

H

I

J

K

L

M

PEF917U

SEF200U
2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM
7. CHECK FOR EVAP LEAK
Without CONSULT-II 1. Turn ignition switch OFF. 2. Apply 12 volts DC to EVAP canister vent control valve. The
valve will close. (Continue to apply 12 volts until the end of test.) 3. Pressurize the EVAP line using pressure pump with 1.3 to 2.7
kPa (10 to 20 mmHg, 0.39 to 0.79 inHg), then remove pump and EVAP service port adapter. NOTE: G Never use compressed air or a high pressure pump. G Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pres-
sure in the system.
4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. Refer to EC-36, "EVAPORATIVE EMISSION LINE DRAWING" .
OK or NG OK >> GO TO 8. NG >> Repair or replace.

[QG18DE]
BBIA0157E

8. CHECK EVAP CANISTER VENT CONTROL VALVE

SEF200U

Check the following. G EVAP canister vent control valve is installed properly. Refer to EC-39, "EVAP CANISTER VENT CON-
TROL VALVE" G EVAP canister vent control valve. Refer to EC-374, "Component Inspection" OK or NG
OK >> GO TO 9. NG >> Repair or replace EVAP canister vent control valve and O-ring.
9. CHECK IF EVAP CANISTER SATURATED WITH WATER

1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
2. Does water drain from the EVAP canister?
Yes or No
Yes >> GO TO 10. No (With CONSULT-II)>>GO TO 12. No (Without CONSULT-II)>>GO TO 13.

PBIB1213E

Revision: December 2006

EC-412

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM

[QG18DE]

10. CHECK EVAP CANISTER A

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor

attached.

The weight should be less than 1.9 kg (4.2 lb).

EC

OK or NG

OK (With CONSULT-II)>>GO TO 12.

OK (Without CONSULT-II)>>GO TO 13.

C

NG >> GO TO 11.

11. DETECT MALFUNCTIONING PART D

Check the following.

G EVAP canister for damage

G EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

E

>> Repair hose or replace EVAP canister. F
12. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

With CONSULT-II

G

1. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.

2. Start engine.

3. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode.

H

4. Touch "Qu" on CONSULT-II screen to increase "PURG VOL

CONT/V" opening to 100%.

5. Check vacuum hose for vacuum when revving engine up to

I

2,000 rpm.

OK or NG

OK >> GO TO 15.

J

NG >> GO TO 14.

K
PBIB1786E

13. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
L Without CONSULT-II

1. Start engine and warm it up to normal operating temperature.

2. Stop engine.

M

3. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.

4. Start engine and let it idle for at least 80 seconds.

5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

Vacuum should exist.

OK or NG OK >> GO TO 15. NG >> GO TO 14.
14. CHECK VACUUM HOSE

Check vacuum hoses for clogging or disconnection. Refer to EC-104, "Vacuum Hose Drawing" .
OK or NG OK >> GO TO 15. NG >> Repair or reconnect the hose.

Revision: December 2006

EC-413

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM
15. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

[QG18DE]

Refer to EC-367, "Component Inspection" . OK or NG
OK >> GO TO 16. NG >> Replace EVAP canister purge volume control solenoid valve.
16. CHECK FUEL TANK TEMPERATURE SENSOR

Refer to EC-297, "Component Inspection" . OK or NG
OK >> GO TO 17. NG >> Replace fuel level sensor unit.
17. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to EC-392, "Component Inspection" . OK or NG
OK >> GO TO 18. NG >> Replace EVAP control system pressure sensor.
18. CHECK EVAP PURGE LINE

Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection. Refer to EC-36, "EVAPORATIVE EMISSION LINE DRAWING" . OK or NG
OK >> GO TO 19. NG >> Repair or reconnect the hose.
19. CLEAN EVAP PURGE LINE

Clean EVAP purge line (pipe and rubber tube) using air blower.

>> GO TO 20.
20. CHECK EVAP/ORVR LINE
Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper connection. For location, refer to EC-42, "ON BOARD REFUELING VAPOR RECOVERY (ORVR)" . OK or NG
OK >> GO TO 21. NG >> Repair or replace hoses and tubes.
21. CHECK SIGNAL LINE AND RECIRCULATION LINE
Check signal line recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, looseness and improper connection. OK or NG
OK >> GO TO 22. NG >> Repair or replace hose, tube or filler neck tube.
22. CHECK REFUELING CONTROL VALVE
Refer to EC-46, "Component Inspection" . OK or NG
OK >> GO TO 23. NG >> Replace refueling control valve with fuel tank.

Revision: December 2006

EC-414

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM
23. CHECK FUEL LEVEL SENSOR
Refer to DI-26, "FUEL LEVEL SENSOR UNIT CHECK" . OK or NG
OK >> GO TO 24. NG >> Replace fuel level sensor unit.
24. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END

[QG18DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-415

2006 Sentra

DTC P0460 FUEL LEVEL SENSOR
DTC P0460 FUEL LEVEL SENSOR
Component Description
The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combination meter sends the fuel level sensor signal to the ECM through CAN communication line. It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float.

[QG18DE]
PFP:25060
UBS00B8Z

PBIB1218E

On Board Diagnostic Logic

UBS00B90

NOTE: G If DTC P0460 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-152, "DTC U1000, U1001 CAN COMMUNICATION LINE" .
G If DTC P0460 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to EC-155, "DTC U1010 CAN COMMUNICATION" .
When the vehicle is parked, naturally the fuel level in the fuel tank is stable. It means that output signal of the fuel level sensor does not change. If ECM senses sloshing signal from the sensor, fuel level sensor malfunction is detected.

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0460 0460

Fuel level sensor circuit noise

Even though the vehicle is parked, a signal being varied is sent from the fuel level sensor to ECM.

G Harness or connectors (The CAN communication line is open or shorted)
G Harness or connectors (The sensor circuit is open or shorted)
G Combination meter
G Fuel level sensor

DTC Confirmation Procedure

UBS00B91

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II
1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and wait maximum of 2 consecutive minutes. 4. If 1st trip DTC is detected, go to EC-417, "Diagnostic Procedure"
.

WITH GST Follow the procedure "WITH CONSULT-II" above.

Revision: December 2006

EC-416

SEF195Y
2006 Sentra

DTC P0460 FUEL LEVEL SENSOR
Diagnostic Procedure
1. CHECK COMBINATION METER
Refer to DI-4 . OK or NG
OK >> GO TO 2. NG >> GO TO DI-4 .
2. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Removal and Installation
FUEL LEVEL SENSOR Refer to DI-26, "FUEL LEVEL SENSOR UNIT CHECK" .

[QG18DE]
UBS00B92
A

EC

C

D

UBS00B93

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-417

2006 Sentra

DTC P0461 FUEL LEVEL SENSOR
DTC P0461 FUEL LEVEL SENSOR
Component Description
The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combination meter sends the fuel level sensor signal to the ECM through CAN communication line. It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float.

[QG18DE]
PFP:25060
UBS00B94

PBIB1218E

On Board Diagnostic Logic

UBS00B95

NOTE: G If DTC P0461 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-152, "DTC U1000, U1001 CAN COMMUNICATION LINE" .
G If DTC P0461 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to EC-155, "DTC U1010 CAN COMMUNICATION" .
Driving long distances naturally affect fuel gauge level. This diagnosis detects the fuel gauge malfunction of the gauge not moving even after a long distance has been driven.

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0461 0461

Fuel level sensor circuit range/performance

The output signal of the fuel level sensor does not change within the specified range even though the vehicle has been driven a long distance.

G Harness or connectors (The CAN communication line is open or shorted)
G Harness or connectors (The sensor circuit is open or shorted)
G Combination meter
G Fuel level sensor

Overall Function Check

UBS00B96

Use this procedure to check the overall function of the fuel level sensor function. During this check, a 1st trip DTC might not be confirmed.
WARNING: When performing following procedure, be sure to observe the handling of the fuel. Refer to FL-2, "FUEL SYSTEM" . TESTING CONDITION: Before starting overall function check, preparation of draining fuel and refilling fuel is required.

WITH CONSULT-II

NOTE: Start from step 10, if it is possible to confirm that the fuel cannot be drained by 30 (7-7/8 US gal, 6-5/ 8 Imp gal) in advance. 1. Prepare a fuel container and a spare hose. 2. Release fuel pressure from fuel line, refer to EC-82, "FUEL PRESSURE RELEASE" . 3. Remove the fuel feed hose on the fuel level sensor unit. 4. Connect a spare fuel hose where the fuel feed hose was removed. 5. Turn ignition switch OFF and wait at least 10 seconds then turn ON.

Revision: December 2006

EC-418

2006 Sentra

DTC P0461 FUEL LEVEL SENSOR

[QG18DE]

6. Select "FUEL LEVEL SE" in "DATA MONITOR" mode with CONSULT-II.
7. Check "FUEL LEVEL SE" output voltage and note it. 8. Select "FUEL PUMP" in "ACTIVE TEST" mode with CONSULT-
II.
9. Touch "ON" and drain fuel approximately 30 (7-7/8 US gal, 65/8 Imp gal) and stop it.
10. Check "FUEL LEVEL SE" output voltage and note it.
11. Fill fuel into the fuel tank for 30 (7-7/8 US gal, 6-5/8 Imp gal).
12. Check "FUEL LEVEL SE" output voltage and note it. 13. Confirm whether the voltage changes more than 0.03V during step 7 to 10 and 10 to 12.
If NG, go to EC-419, "Diagnostic Procedure" .

A
EC
C
SEF195Y
D

WITH GST

E

NOTE:

Start from step 8, if it is possible to confirm that the fuel cannot be drained by 30 (7-7/8 US gal, 6-5/8

Imp gal) in advance.

F

1. Prepare a fuel container and a spare hose.

2. Release fuel pressure from fuel line, refer to EC-82, "FUEL PRESSURE RELEASE" .

3. Remove the fuel feed hose on the fuel level sensor unit.

G

4. Connect a spare fuel hose where the fuel feed hose was removed.

5. Turn ignition switch ON.

6. Drain fuel by 30 (7-7/8 US gal, 6-5/8 Imp gal) from the fuel tank using proper equipment.

H

7. Confirm that the fuel gauge indication varies.

8. Fill fuel into the fuel tank for 30 (7-7/8 US gal, 6-5/8 Imp gal).

I

9. Confirm that the fuel gauge indication varies.

10. If NG, go to EC-419, "Diagnostic Procedure" .

Diagnostic Procedure
1. CHECK COMBINATION METER

J
UBS00B97

Refer to DI-7 .

K

OK or NG

OK >> GO TO 2.

NG >> GO TO DI-7 .

L

2. CHECK INTERMITTENT INCIDENT

M Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Removal and Installation
FUEL LEVEL SENSOR Refer to DI-26, "FUEL LEVEL SENSOR UNIT CHECK" .

UBS00B98

Revision: December 2006

EC-419

2006 Sentra

DTC P0462, P0463 FUEL LEVEL SENSOR
DTC P0462, P0463 FUEL LEVEL SENSOR
Component Description
The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combination meter sends the fuel level sensor signal to the ECM through CAN communication. It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float.

[QG18DE]
PFP:25060
UBS00B99

PBIB1218E

On Board Diagnostic Logic

UBS00B9A

NOTE: G If DTC P0462 or P0463 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis
for DTC U1000, U1001. Refer to EC-152, "DTC U1000, U1001 CAN COMMUNICATION LINE" .
G If DTC P0462 or P0463 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to EC-155, "DTC U1010 CAN COMMUNICATION" .
This diagnosis indicates the former, to detect open or short circuit malfunction.

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0462 0462
P0463 0463

Fuel level sensor circuit low input
Fuel level sensor circuit high input

An excessively low voltage from the sensor is sent to ECM.
An excessively high voltage from the sensor is sent to ECM.

G Harness or connectors (The CAN communication line is open or shorted)
G Harness or connectors (The sensor circuit is open or shorted)
G Combination meter
G Fuel level sensor

DTC Confirmation Procedure

UBS00B9B

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11V at ignition switch ON.

WITH CONSULT-II
1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Wait at least 5 seconds. 4. If 1st trip DTC is detected, go to EC-421, "Diagnostic Procedure"
.

WITH GST Follow the procedure "WITH CONSULT-II" above.

Revision: December 2006

EC-420

SEF195Y
2006 Sentra

DTC P0462, P0463 FUEL LEVEL SENSOR
Diagnostic Procedure
1. CHECK COMBINATION METER
Refer to DI-4 OK or NG
OK >> GO TO 2. NG >> GO TO DI-7 .
2. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Removal and Installation
FUEL LEVEL SENSOR Refer toDI-26, "FUEL LEVEL SENSOR UNIT CHECK" .

[QG18DE]
UBS00B9C
A

EC

C

D

UBS00B9D

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-421

2006 Sentra

DTC P0500 VSS

[QG18DE]

DTC P0500 VSS

PFP:32702

Component Description

UBS00B9E

NOTE: G If DTC P0500 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-152, "DTC U1000, U1001 CAN COMMUNICATION LINE" .
G If DTC P0500 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to EC-155, "DTC U1010 CAN COMMUNICATION" .
The vehicle speed sensor is installed in the transaxle. It contains a pulse generator which provides a vehicle speed signal to the combination meter. The combination meter then sends a signal to the ECM through CAN communication line.

On Board Diagnosis Logic

UBS00B9F

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0500 0500

Vehicle speed sensor

The almost 0 km/h (0 MPH) signal from vehicle speed sensor is sent to ECM even when vehicle is being driven.

G Harness or connectors (The CAN communication line is open or shorted)
G Harness or connectors (The vehicle speed signal circuit is open or shorted)
G Vehicle speed sensor
G Combination meter

DTC Confirmation Procedure

UBS00B9G

CAUTION: Always drive vehicle at a safe speed.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Steps 1 and 2 may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.

WITH CONSULT-II 1. Start engine.
2. Read "VHCL SPEED SE" in "DATA MONITOR" mode with CONSULT-II. The vehicle speed on CONSULTII should exceed 10 km/h (6 MPH) when rotating wheels with suitable gear position. If NG, go to EC-423, "Diagnostic Procedure" . If OK, go to following step.
3. Select "DATA MONITOR" mode with CONSULT-II.
4. Warm engine up to normal operating temperature.
5. Maintain the following conditions for at least 60 consecutive seconds.

ENG SPEED

1,800 - 6,000 rpm (A/T) 2,200 - 6,000 rpm (M/T)

B/FUEL SCHDL

4.8 - 31.8 msec

Selector lever

Except P or N position

PW/ST SIGNAL

OFF

6. If 1st trip DTC is detected, go to EC-423, "Diagnostic Procedure" .

SEF196Y

Overall Function Check

UBS00B9H

Use this procedure to check the overall function of the vehicle speed signal circuit. During this check, a 1st trip DTC might not be confirmed.

Revision: December 2006

EC-422

2006 Sentra

DTC P0500 VSS

[QG18DE]

WITH GST

1. Lift up drive wheels.

A

2. Start engine.

3. Read vehicle speed sensor signal in Service $01 with GST. The vehicle speed sensor on GST should be able to exceed 10 km/h (6 MPH) when rotating wheels with EC suitable gear position.

4. If NG, go to EC-423, "Diagnostic Procedure" .
Diagnostic Procedure
1. CHECK VEHICLE SPEED SENSOR CIRCUIT

C
UBS00B9I

Refer to DI-4, "METERS AND GAUGES" .

D

OK or NG

OK >> GO TO 2.

E

NG >> Repair or replace.

2. CHECK COMBINATION METER F Refer toDI-7, "Combination Meter" .

>> INSPECTION END

G

H

I

J

K

L

M

Revision: December 2006

EC-423

2006 Sentra

DTC P0506 ISC SYSTEM

[QG18DE]

DTC P0506 ISC SYSTEM

PFP:23781

Description

UBS00B9J

NOTE: If DTC P0506 is displayed with other DTC, first perform the trouble diagnosis for the other DTC. The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is let into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects the actual engine speed and sends a signal to the ECM. The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily. The optimum value stored in the ECM is determined by taking into consideration various engine conditions, such as during warming up, deceleration, and engine load (air conditioner, power steering and cooling fan operation, etc.).

On Board Diagnosis Logic

UBS00B9K

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0506 0506

Idle speed control system The idle speed is less than the target idle RPM lower than expected speed by 100 rpm or more.

G Electric throttle control actuator G Intake air leak

DTC Confirmation Procedure

UBS00B9L

NOTE: G If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait
at least 10 seconds before conducting the next test.
G If the target idle speed is out of the specified value, perform Idle Air Volume Learning, EC-80 , before conducting DTC Confirmation Procedure. For the target idle speed, refer to EC-603, "SERVICE DATA AND SPECIFICATIONS (SDS)" .
TESTING CONDITION:
G Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
G Always perform the test at a temperature above -10°C (14°F).

WITH CONSULT-II 1. Open engine hood. 2. Start engine and warm it up to normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds. 4. Turn ignition switch ON again and select "DATA MONITOR"
mode with CONSULT-II.
5. Start engine and run it for at least 1 minute at idle speed. 6. If 1st trip DTC is detected, go to EC-425, "Diagnostic Procedure"
.

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF174Y

Revision: December 2006

EC-424

2006 Sentra

Diagnostic Procedure
1. CHECK INTAKE AIR LEAK

DTC P0506 ISC SYSTEM

[QG18DE]
UBS00B9M
A

1. Start engine and let it idle.

2. Listen for an intake air leak after the mass air flow sensor.

EC

OK or NG

OK >> GO TO 2.

NG >> Discover air leak location and repair.

C

2. REPLACE ECM

D 1. Stop engine.

2. Replace ECM.

3. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs.

E

Refer to BL-96 .

4. Perform EC-79, "VIN Registration" .

5. Perform EC-79, "Accelerator Pedal Released Position Learning" .

F

6. Perform EC-80, "Throttle Valve Closed Position Learning" .

7. Perform EC-80, "Idle Air Volume Learning" .

G

>> INSPECTION END

H

I

J

K

L

M

Revision: December 2006

EC-425

2006 Sentra

DTC P0507 ISC SYSTEM

[QG18DE]

DTC P0507 ISC SYSTEM

PFP:23781

Description

UBS00B9N

NOTE: If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for the other DTC. The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is let into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects the actual engine speed and sends a signal to the ECM. The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily. The optimum value stored in the ECM is determined by taking into consideration various engine conditions, such as during warming up, deceleration, and engine load (air conditioner, power steering and cooling fan operation, etc.).

On Board Diagnosis Logic

UBS00B9O

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0507 0507

Idle speed control system RPM higher than expected

The idle speed is more than the target idle speed by 200 rpm or more.

G Electric throttle control actuator G Intake air leak G PCV system

DTC Confirmation Procedure

UBS00B9P

NOTE: G If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait
at least 10 seconds before conducting the next test.
G If the target idle speed is out of the specified value, perform "Idle Air Volume Learning", EC-80 , before conducting DTC Confirmation Procedure. For the target idle speed, refer to EC-603, "SERVICE DATA AND SPECIFICATIONS (SDS)" .
TESTING CONDITION:
G Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
G Always perform the test at a temperature above -10°C (14°F).

WITH CONSULT-II 1. Open engine hood.
2. Start engine and warm it up to normal operating temperature. 3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON again and select "DATA MONITOR" mode with CONSULT-II.
5. Start engine and run it for at least 1 minute at idle speed. 6. If 1st trip DTC is detected, go to EC-427, "Diagnostic Procedure"
.

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF174Y

Revision: December 2006

EC-426

2006 Sentra

DTC P0507 ISC SYSTEM
Diagnostic Procedure
1. CHECK PCV HOSE CONNECTION

[QG18DE]
UBS00B9Q
A

Confirm that PCV hose is connected correctly.

OK or NG

EC

OK >> GO TO 2.

NG >> Repair or replace.

2. CHECK INTAKE AIR LEAK

C

1. Start engine and let it idle. D
2. Listen for an intake air leak after the mass air flow sensor.

OK or NG

OK >> GO TO 3.

E

NG >> Discover air leak location and repair.

3. REPLACE ECM F

1. Stop engine.

2. Replace ECM.

3. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs.

G

Refer to BL-96 .

4. Perform EC-79, "VIN Registration" .

5. Perform EC-79, "Accelerator Pedal Released Position Learning" .

H

6. Perform EC-80, "Throttle Valve Closed Position Learning" . 7. Perform EC-80, "Idle Air Volume Learning" .
I

>> INSPECTION END J

K

L

M

Revision: December 2006

EC-427

2006 Sentra

DTC P0550 PSP SENSOR
DTC P0550 PSP SENSOR
Component Description
Power steering pressure (PSP) sensor is installed to the power steering high-pressure tube and detects a power steering load. This sensor is a potentiometer which transforms the power steering load into output voltage, and emits the voltage signal to the ECM. The ECM controls the electric throttle control actuator and adjusts the throttle valve opening angle to increase the engine speed and adjusts the idle speed for the increased load.

[QG18DE]
PFP:49763
UBS00B9R

CONSULT-II Reference Value in Data Monitor Mode

BBIA0164E UBS00B9S

Specification data are reference values.

MONITOR ITEM PW/ST SIGNAL

CONDITION

G Engine: After warming up, idle the engine

Steering wheel: Not being turned Steering wheel: Being turned.

SPECIFICATION OFF ON

On Board Diagnosis Logic

UBS00B9T

The MIL will not light up for this diagnosis.
NOTE: If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to EC-440, "DTC P0643 SENSOR POWER SUPPLY" .

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0550 0550

Power steering pressure sensor circuit

An excessively low or high voltage from the sensor is sent to ECM.

G Harness or connectors (The sensor circuit is open or shorted.)
G Power steering pressure sensor

DTC Confirmation Procedure

UBS00B9U

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for at least 5 seconds. 4. If 1st trip DTC is detected, go to EC-430, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

Revision: December 2006

EC-428

2006 Sentra

Wiring Diagram

DTC P0550 PSP SENSOR

[QG18DE]
UBS00B9V
A EC
C D E F G H I J K L M

Revision: December 2006

EC-429

BBWA2260E
2006 Sentra

DTC P0550 PSP SENSOR

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

12 P

Power steering pressure sensor

67 B/W 68 G/R

Sensor ground
Sensor power supply (Power steering pressure sensor)

CONDITION
[Engine is running] G Steering wheel: Being turned. [Engine is running] G Steering wheel: Not being turned. [Engine is running] G Warm-up condition G Idle speed
[Ignition switch: ON]

DATA (DC Voltage) 0.5 - 4.0V 0.4 - 0.8V Approximately 0V Approximately 5V

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS00B9W

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

BBIA0515E

Revision: December 2006

EC-430

2006 Sentra

DTC P0550 PSP SENSOR
2. CHECK PSP SENSOR POWER SUPPLY CIRCUIT
1. Disconnect PSP sensor harness connector. 2. Turn ignition switch ON.

[QG18DE]
A EC

C

3. Check voltage between PSP sensor terminal 1 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

D
BBIA0164E
E
F
G

3. CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

PBIB0188E

H

1. Turn ignition switch OFF.

I

2. Disconnect ECM harness connector.

3. Disconnect TCM harness connector. J
4. Check harness continuity between PSP sensor terminal 3 and ECM terminal 67, TCM terminal 42.

Continuity should exist.

5. Also check harness for short to ground and short to power.

K

OK or NG

OK >> GO TO 5. NG >> GO TO 4.

L

4. DETECT MALFUNCTIONING PART
M Check the following.
G Harness for open or short between power steering pressure sensor and ECM
G Harness for open or short between power steering pressure sensor and TCM

>> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 12 and PSP sensor terminal 2.
Continuity should exist. 2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 6. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-431

2006 Sentra

DTC P0550 PSP SENSOR

6. CHECK PSP SENSOR
Refer to EC-432, "Component Inspection" . OK or NG
OK >> GO TO 7. NG >> Replace PSP sensor.
7. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
POWER STEERING PRESSURE SENSOR 1. Reconnect all harness connectors disconnected. 2. Start engine and let it idle.
3. Check voltage between ECM terminal 12 and ground under the following conditions.

Condition Steering wheel: Being turned fully. Steering wheel: Not being turned.

Voltage 0.5 - 4.0V 0.4 - 0.8V

[QG18DE]
UBS00B9X MBIB0025E

Revision: December 2006

EC-432

2006 Sentra

DTC P0603 ECM POWER SUPPLY
DTC P0603 ECM POWER SUPPLY Component Description
Battery voltage is supplied to the ECM even when the ignition switch is turned OFF for the ECM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the idle air volume learning value memory, etc.

[QG18DE]
PFP:23710
A
UBS00BAA
EC
C

D

On Board Diagnosis Logic

PBIB1164E
E
UBS00BAB

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

G Harness or connectors

F

P0603 0603

ECM power supply cir- ECM back-up RAM system does not function

cuit

properly.

[ECM power supply (back-up) circuit is open or shorted.]

G ECM

G

DTC Confirmation Procedure

UBS00BAC

NOTE:

H

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

WITH CONSULT-II

I

1. Turn ignition switch ON and wait at least 1 second.

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Start engine and let it idle for 1 second.

J

4. Turn ignition switch OFF, wait at least 10 seconds, and then turn

ON.

5. Repeat steps 3 and 4 for 4 times.

K

6. If 1st trip DTC is detected, go to EC-435, "Diagnostic Procedure" . L

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y
M

Revision: December 2006

EC-433

2006 Sentra

Wiring Diagram

DTC P0603 ECM POWER SUPPLY

[QG18DE]
UBS00BAD

Revision: December 2006

EC-434

BBWA1437E
2006 Sentra

DTC P0603 ECM POWER SUPPLY

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

121 W/L

Power supply for ECM (Back-up)

[Ignition switch: OFF]

BATTERY VOLTAGE

C

(11 - 14V)

Diagnostic Procedure
1. CHECK ECM POWER SUPPLY

UBS00BAE
D

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

E

3. Check voltage between ECM terminal 121 and ground with CONSULT-II or tester. F Voltage: Battery voltage

OK or NG

OK >> GO TO 3.

G

NG >> GO TO 2.

2. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E10, F48 G Fuse and fusible link box E24 G 10A fuse G Harness for open or short between ECM and battery

H
MBIB0026E
I
J
K

>> Repair or replace harness or connectors. L
3. CHECK INTERMITTENT INCIDENT

Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

M

OK or NG

OK >> GO TO 4. NG >> Repair open circuit short to ground or short to power in harness or connectors.

Revision: December 2006

EC-435

2006 Sentra

DTC P0603 ECM POWER SUPPLY
4. PERFORM DTC CONFIRMATION PROCEDURE

[QG18DE]

With CONSULT-II 1. Turn ignition switch ON. 2. Select "SELF DIAG RESULTS" mode with CONSULT-II. 3. Touch "ERASE". 4. Perform DTC Confirmation Procedure.
See EC-433, "DTC Confirmation Procedure" . 5. Is the 1st trip DTC P0603 displayed again?
With GST 1. Turn ignition switch ON. 2. Select "Service $04" with GST. 3. Perform DTC Confirmation Procedure.
See EC-433, "DTC Confirmation Procedure" . 4. Is the 1st trip DTC P0603 displayed again? Yes or No
Yes >> GO TO 5. No >> INSPECTION END
5. REPLACE ECM

1. Replace ECM. 2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to
BL-96 . 3. Perform EC-79, "VIN Registration" . 4. Perform EC-79, "Accelerator Pedal Released Position Learning" . 5. Perform EC-80, "Throttle Valve Closed Position Learning" . 6. Perform EC-80, "Idle Air Volume Learning" .

>> INSPECTION END

Revision: December 2006

EC-436

2006 Sentra

DTC P0605 ECM
DTC P0605 ECM Component Description
The ECM consists of a microcomputer and connectors for signal input and output and for power supply. The ECM controls the engine.

[QG18DE]
PFP:23710
A
UBS00B9Y
EC

C

D

On Board Diagnosis Logic
This self-diagnosis has one or two trip detection logic.

DTC No.
P0605 0605

Trouble diagnosis name A)
Engine control module B) C)

DTC detecting condition ECM calculation function is malfunctioning. ECM EEP-ROM system is malfunctioning. ECM self shut-off function is malfunctioning.

PBIB1164E
E
UBS00B9Z

Possible cause

F

G ECM

G

FAIL-SAFE MODE

H

ECM enters in fail-safe mode when the malfunction A is detected.

Detected items

Engine operation condition in fail-safe mode

I

G ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx.

Malfunction A

5 degrees) by the return spring.

G ECM deactivates ASCD operation.
DTC Confirmation Procedure

J
UBS00BA0

Perform PROCEDURE FOR MALFUNCTION A first. If the 1st trip DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B. If there is no malfunction on PROCEDURE FOR MALFUNCTION K B, perform PROCEDURE FOR MALFUNCTION C.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at L least 10 seconds before conducting the next test.

PROCEDURE FOR MALFUNCTION A

With CONSULT-II

M

1. Turn ignition switch ON.

2. Select "DATA MONITOR" mode with CONSULT-II.

3. If 1st trip DTC is detected, go to EC-438, "Diagnostic Procedure" .

With GST Follow the procedure "With CONSULT-II" above.

Revision: December 2006

EC-437

SEF058Y
2006 Sentra

DTC P0605 ECM
PROCEDURE FOR MALFUNCTION B With CONSULT-II
1. Turn ignition switch ON and wait at least 1 second. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Turn ignition switch OFF, wait at least 10 seconds, and then turn
ON. 4. If 1st trip DTC is detected, go to EC-438, "Diagnostic Procedure"
.

With GST Follow the procedure "With CONSULT-II" above.
PROCEDURE FOR MALFUNCTION C With CONSULT-II
1. Turn ignition switch ON and wait at least 1 second. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Turn ignition switch OFF, wait at least 10 seconds, and then turn
ON. 4. Repeat step 3 for 32 times. 5. If 1st trip DTC is detected, go to EC-438, "Diagnostic Procedure"
.

With GST Follow the procedure "With CONSULT-II" above.
Diagnostic Procedure
1. INSPECTION START
With CONSULT-II 1. Turn ignition switch ON. 2. Select "SELF DIAG RESULTS" mode with CONSULT-II. 3. Touch "ERASE". 4. Perform DTC Confirmation Procedure.
See EC-437, "DTC Confirmation Procedure" . 5. Is the 1st trip DTC P0605 displayed again?
With GST 1. Turn ignition switch ON. 2. Select Service $04 with GST. 3. Perform DTC Confirmation Procedure.
See EC-437, "DTC Confirmation Procedure" . 4. Is the 1st trip DTC P0605 displayed again? Yes or No
Yes >> GO TO 2. No >> INSPECTION END

Revision: December 2006

EC-438

[QG18DE]
SEF058Y SEF058Y
UBS00BA1
2006 Sentra

DTC P0605 ECM

[QG18DE]

2. REPLACE ECM A

1. Stop engine.

2. Replace ECM.

3. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs.

EC

Refer to BL-96 .

4. Perform EC-79, "VIN Registration" .

5. Perform EC-79, "Accelerator Pedal Released Position Learning" .

C

6. Perform EC-80, "Throttle Valve Closed Position Learning" .

7. Perform EC-80, "Idle Air Volume Learning" .

D

>> INSPECTION END E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-439

2006 Sentra

DTC P0643 SENSOR POWER SUPPLY
DTC P0643 SENSOR POWER SUPPLY On Board Diagnosis Logic
This self-diagnosis has the one trip detection logic.

[QG18DE]
PFP:18919
UBS00KJV

DTC No. Trouble diagnosis name

DTC detecting condition

P0643 0643

Sensor power supply circuit ECM detects a voltage of power source

short

for sensor is excessively low or high.

Possible cause
G Harness or connectors (APP sensor 1 circuit is shorted.) (PSP sensor circuit is shorted.) (Refrigerant pressure sensor circuit is shorted.) (EVAP control system pressure sensor circuit is shorted.)
G Accelerator pedal position sensor
G Power steering pressure sensor
G Refrigerant pressure sensor
G EVAP control system pressure sensor

FAIL-SAFE MODE When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

Engine operation condition in fail-safe mode

ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.

DTC Confirmation Procedure

UBS00KJW

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for 1 second. 4. If DTC is detected, go to EC-443, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-440

2006 Sentra

Wiring Diagram

DTC P0643 SENSOR POWER SUPPLY

[QG18DE]
UBS00KJX
A EC
C D E F G H I J K L M

Revision: December 2006

EC-441

BBWA2135E
2006 Sentra

DTC P0643 SENSOR POWER SUPPLY

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

48 R/W

Sensor power supply (EVAP control system pressure sensor)

[Ignition switch: ON]

Approximately 5V

49 R/Y

Sensor power supply (Refrigerant pressure sensor)

[Ignition switch: ON]

Approximately 5V

68 G/R

Sensor power supply (Power steering pressure sensor)

[Ignition switch: ON]

Approximately 5V

82 B/Y

Sensor ground (Accelerator pedal position sensor 1)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

83 G

Sensor ground (Accelerator pedal position sensor 2)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

90 R

Sensor power supply (Accelerator pedal position sensor 1)

[Ignition switch: ON]

Approximately 5V

91 R/G

Sensor power supply (Accelerator pedal position sensor 2)

[Ignition switch: ON]

Approximately 5V

98 R/B

Accelerator pedal position sensor 2

[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully depressed

0.28 - 0.48V More than 2.0V

106 W

Accelerator pedal position sensor 1

[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully depressed

0.65 - 0.87V More than 4.3V

Revision: December 2006

EC-442

2006 Sentra

DTC P0643 SENSOR POWER SUPPLY
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body.
Refer to EC-151, "Ground Inspection" .

[QG18DE]
UBS00KJY
A
EC
C

D

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT-I
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.

E
BBIA0515E
F
G
H
I

J

3. Check voltage between APP sensor terminal 2 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 7. NG >> GO TO 3.

BBIA0104E

K

L

M

3. CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT-II

1. Turn ignition switch OFF. 2. Disconnect ECM harness connector.
3. Check harness continuity between APP sensor terminal 2 and ECM terminal 90. Refer to Wiring Diagram.

Continuity should exist.

OK or NG
OK >> GO TO 5. NG >> GO TO 4.

Revision: December 2006

EC-443

PBIB0811E
2006 Sentra

DTC P0643 SENSOR POWER SUPPLY
4. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M58, F26 G Harness for open between ECM and accelerator pedal position sensor

[QG18DE]

>> Repair open circuit.
5. CHECK SENSOR POWER SUPPLY CIRCUITS

Check harness for short to power and short to ground, between the following terminals.

ECM terminal

Sensor terminal

Reference Wiring Diagram

90

APP sensor terminal 2

EC-441

48

EVAP control system pressure sensor terminal 3

EC-389

49

Refrigerant pressure sensor terminal 3

EC-598

68

PSP sensor terminal 1

EC-429

OK or NG
OK >> GO TO 6. NG >> Repair short to ground or short to power in harness or connectors.

6. CHECK COMPONENTS

Check the following. G Refrigerant pressure sensor (Refer to EC-598, "Diagnostic Procedure" .) G Power steering pressure sensor (Refer toEC-432, "Component Inspection" .) G EVAP control system pressure sensor (Refer to EC-399, "Component Inspection" .) OK or NG
OK >> GO TO 9. NG >> Replace malfunctioning component.
7. CHECK APP SENSOR

Refer to EC-542, "Component Inspection" . OK or NG
OK >> GO TO 9. NG >> GO TO 8.
8. REPLACE ACCELERATOR PEDAL ASSEMBLY

1. Replace accelerator pedal assembly. 2. Perform EC-79, "Accelerator Pedal Released Position Learning" . 3. Perform EC-80, "Throttle Valve Closed Position Learning" . 4. Perform EC-80, "Idle Air Volume Learning" .

>> INSPECTION END
9. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-444

2006 Sentra

DTC P0850 PNP SWITCH
DTC P0850 PNP SWITCH
Component Description
When the gear position is P or N (A/T models), Neutral (M/T models), park/neutral position (PNP) switch is ON. ECM detects the park/neutral position when continuity with ground exists. For A/T models, the park/neutral position (PNP) switch assembly also indicates a transmission range switch to detect selector lever position.

[QG18DE]
PFP:23006
A
UBS00BFP
EC
C
D

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

P/N POSI SW

G Ignition switch: ON

CONDITION Shift lever: P or N (A/T), Neutral (M/T) Except above

On Board Diagnosis Logic

SEF752Y
E
UBS00BFQ

ON OFF

SPECIFICATION

F

G
UBS00BFR

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

H

P0850 0850

G Harness or connectors

Park/neutral position switch

The signal of the park/neutral position (PNP) switch is not changed in the process of engine starting and driving.

[The park/neutral position (PNP) switch circuit is open or shorted.]

I

G Park/neutral position (PNP) switch

DTC Confirmation Procedure
CAUTION: Always drive vehicle at a safe speed.

UBS00BFS
J

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at K least 10 seconds before conducting the next test.

WITH CONSULT-II

L

1. Turn ignition switch ON.

2. Select "P/N POSI SW" in "DATA MONITOR" mode with CON-

SULT-II. Then check the "P/N POSI SW" signal under the follow-

M

ing conditions.

Position (Selector lever)
N or P position (A/T models) Neutral position (M/T models)
Except the above position

Known-good signal ON OFF

If NG, go to EC-448, "Diagnostic Procedure" . If OK, go to following step. 3. Select "DATA MONITOR" mode with CONSULT-II.
4. Start engine and warm it up to normal operating temperature.

SEF212Y

Revision: December 2006

EC-445

2006 Sentra

DTC P0850 PNP SWITCH
5. Maintain the following conditions for at least 50 consecutive seconds.

[QG18DE]

ENG SPEED

1,550 - 6,375 rpm (A/T) 1,850 - 6,375 rpm (M/T)

B/FUEL SCHDL

3.0 - 31.8 msec (A/T) 2.8 - 31.8 msec (M/T)

VHCL SPEED SE

More than 64 km/h (40 MPH)

Selector lever

Suitable position

6. If 1st trip DTC is detected, go to EC-448, "Diagnostic Procedure" .

SEF213Y

Overall Function Check

UBS00BFT

Use this procedure to check the overall function of the park/neutral position switch circuit. During this check, a 1st trip DTC might not be confirmed.

WITH GST 1. Turn ignition switch ON.
2. Check voltage between ECM terminal 102 (PNP switch signal) and ground under the following conditions.

Condition (Gear position)

Voltage (V) (Known-good data)

P or N position (A/T models) Neutral position (M/T models)

Approx. 0

Except the above position

A/T models: Battery voltage M/T models: Approximately 5V

3. If NG, go to EC-448, "Diagnostic Procedure" .

MBIB0029E

Revision: December 2006

EC-446

2006 Sentra

Wiring Diagram

DTC P0850 PNP SWITCH

[QG18DE]
UBS00BFU
A EC
C D E F G H I J K L M

Revision: December 2006

EC-447

BBWA0304E
2006 Sentra

DTC P0850 PNP SWITCH

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

102 G/OR PNP switch

CONDITION
[Ignition switch: ON] G Shift lever: P or N (A/T), Neutral (M/T).
[Ignition switch: ON] G Except the above gear position

DATA (DC Voltage)
Approximately 0V
A/T models BATTERY VOLTAGE (11 - 14V) M/T models Approximately 5V

Diagnostic Procedure
1. CHECK PNP SWITCH GROUND CIRCUIT FOR OPEN AND SHORT

UBS00BFV

1. Turn ignition switch OFF. 2. Disconnect PNP switch harness connector. 3. Check harness continuity between PNP switch terminal 2 and ground.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to power. OK or NG
OK >> GO TO 2. NG >> Repair open circuit or short to power in harness or connectors.
2. CHECK INPUT SIGNAL CIRCUIT

1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 102 and PNP switch terminal 1.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
3. CHECK PNP SWITCH

Refer to AT-114, "DTC P0705 PARK/NEUTRAL POSITION (PNP) SWITCH" (A/T models) or MT-12, "POSITION SWITCH" (M/T models). OK or NG
OK >> GO TO 4. NG >> Replace PNP switch.
4. CHECK INTERMITTENT INCIDENT

Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-448

2006 Sentra

DTC P1148 CLOSED LOOP CONTROL

[QG18DE]

DTC P1148 CLOSED LOOP CONTROL On Board Diagnosis Logic

PFP:22690
A
UBS00BCM

This self-diagnosis has the one trip detection logic.

DTC No. Trouble diagnosis name

DTC detecting condition

EC
Possible cause

P1148 1148

Closed loop control function

G The air fuel ratio (A/F) sensor 1 circuit is

The closed loop control function for bank 1

open or shorted.

does not operate even when vehicle is driving in the specified condition.

G Air fuel ratio (A/F) sensor 1

C

G Air fuel ratio (A/F) sensor 1 heater

DTC P1148 is displayed with another DTC for air fuel ratio (A/F) sensor 1.

D

Perform the trouble diagnosis for the corresponding DTC.

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-449

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
DTC P1217 ENGINE OVER TEMPERATURE System Description
COOLING FAN CONTROL

[QG18DE]
PFP:00000
UBS00BCN

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS) Camshaft position sensor (PHASE)

Engine speed*1

Vehicle speed sensor*2 Engine coolant temperature sensor Air conditioner switch

Vehicle speed Engine coolant temperature Air conditioner ON signal

Cooling fan control

Cooling fan relay(s)

Battery

Battery voltage*1

Refrigerant pressure sensor

Refrigerant pressure

*1: ECM determines the start signal status by the signals of engine speed and battery voltage. *2: This signal is sent to the ECM through CAN communication line.

The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant pressure, and air conditioner ON signal. The control system has 3-step control [HIGH/LOW/OFF].

OPERATION

Revision: December 2006

EC-450

PBIB2582E
2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE

[QG18DE]

CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.

UBS00BCO
A

MONITOR ITEM

CONDITION

SPECIFICATION

AIR COND SIG G Engine: After warming up, idle the engine

COOLING FAN

G After warming up engine, idle the engine. G Air conditioner switch: OFF

On Board Diagnosis Logic

A/C switch: OFF
A/C switch: ON (Compressor operates)
Engine coolant temperature: 97°C (207°F) or less
Engine coolant temperature: Between 98°C (208°F) and 99°C (210°F)
Engine coolant temperature: 100°C (212°F) or more

OFF ON OFF LOW HIGH

EC C D E
UBS00BCP

If the cooling fan or another component in the cooling system malfunctions, engine coolant temperature will

rise.

F

When the engine coolant temperature reaches an abnormally high temperature condition, a malfunction is

indicated.

This self-diagnosis has the one trip detection logic.

G

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

G Harness or connectors

H

G Cooling fan does not operate properly (Overheat).

(The cooling fan circuit is open or shorted.) G Cooling fan

P1217 1217

G Cooling fan system does not operate properly G Radiator hose

I

Engine over

(Overheat).

G Radiator

temperature

(Overheat)

G Engine coolant was not added to the system

G Radiator cap

using the proper filling method.

G Water pump

J

G Engine coolant level is not within the specified range.

G Thermostat For more information, refer to EC-461, "Main 12

Causes of Overheating" .

K

CAUTION:

When a malfunction is indicated, be sure to replace the coolant. Refer to MA-16, "Changing Engine

Coolant" . Also, replace the engine oil. Refer to MA-20, "Changing Engine Oil" .

L

1. Fill radiator with coolant up to specified level with a filling speed of 2 liters per minute. Be sure to

use coolant with the proper mixture ratio. Refer to MA-14, "Anti-freeze Coolant Mixture Ratio" .

2. After refilling coolant, run engine to ensure that no water-flow noise is emitted.

M

Overall Function Check

UBS00BCQ

Use this procedure to check the overall function of the cooling fan. During this check, a DTC might not be confirmed.
WARNING: Never remove the radiator cap when the engine is hot. Serious burns could be caused by high pressure fluid escaping from the radiator. Wrap a thick cloth around cap. Carefully remove the cap by turning it a quarter turn to allow built-up pressure to escape. Then turn the cap all the way off.

Revision: December 2006

EC-451

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
WITH CONSULT-II 1. Check the coolant level in the reservoir tank and radiator.
Allow engine to cool before checking coolant level. If the coolant level in the reservoir tank and/or radiator is below the proper range, skip the following steps and go to EC-455, "Diagnostic Procedure" . 2. Confirm whether customer filled the coolant or not. If customer filled the coolant, skip the following steps and go to EC-455, "Diagnostic Procedure" . 3. Turn ignition switch ON.
4. Perform "COOLING FAN" in "ACTIVE TEST" mode with CONSULT-II.
5. If the results are NG, go to EC-455, "Diagnostic Procedure" .

[QG18DE]
SEF621W

SEF646X

WITH GST

1. Check the coolant level in the reservoir tank and radiator. Allow engine to cool before checking coolant level. If the coolant level in the reservoir tank and/or radiator is below the proper range, skip the following steps and go to EC-455, "Diagnostic Procedure" .

2. Confirm whether customer filled the coolant or not. If customer filled the coolant, skip the following steps and go to EC-455, "Diagnostic Procedure" .

3. Start engine. Be careful not to overheat engine.

4. Set temperature control lever to full cold position.

5. Turn air conditioner switch ON.

6. Turn blower fan switch ON.

7. Run engine at idle for a few minutes with air conditioner operating. Be careful not to overheat engine.

8. Make sure that cooling fan operates at low speed. If NG, go to EC-455, "Diagnostic Procedure" . If OK, go to the following step.

SEC163BA

9. Turn ignition switch OFF.

10. Turn air conditioner switch and blower fan switch OFF.

11. Disconnect engine coolant temperature sensor harness connector. 12. Connect 150 resistor to engine coolant temperature sensor harness connector.

Revision: December 2006

EC-452

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
13. Restart engine and make sure that cooling fan operates at higher speed than low speed. Be careful not to overheat engine.
14. If NG, go to EC-455, "Diagnostic Procedure" .

[QG18DE]
A EC
C
MEC475B
D E F G H I J K L M

Revision: December 2006

EC-453

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE Wiring Diagram

[QG18DE]
UBS00BCR

Revision: December 2006

EC-454

BBWA2134E
2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

[Engine is running]

BATTERY VOLTAGE

C

89 LG/B

Cooling fan relay-2 (High)

G Cooling fan is not operating [Engine is running]

(11-14V)

G Cooling fan is high speed operating

0 - 1.0V

D

97 LG/R

Cooling fan relay-1 (Low)

[Ignition switch: ON] G Cooling fan is not operating [Ignition switch: ON] G Cooling fan is operating

BATTERY VOLTAGE (11-14V)
E
0 - 1.0V

Diagnostic Procedure
1. INSPECTION START

UBS00BCS

F

Do you have CONSULT-II?

G

Yes or No

Yes >> GO TO 2.

No >> GO TO 4.

H

2. CHECK COOLING FAN LOW SPEED OPERATION

I With CONSULT-II 1. Turn ignition switch ON.

J

K

2. Perform "COOLING FAN" in "ACTIVE TEST" mode with CONSULT-II.
3. Make sure that cooling fans-1 and -2 operate at low speed.
OK or NG
OK >> GO TO 3. NG >> Check cooling fan low speed control circuit. (Go to EC-
458, "PROCEDURE A" .)

L
WBIA0058E
M

SEF646X

Revision: December 2006

EC-455

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
3. CHECK COOLING FAN HIGH SPEED OPERATION
With CONSULT-II 1. Perform "COOLING FAN" in "ACTIVE TEST" mode with CON-
SULT-II. 2. Make sure that cooling fan-1 operates at high speed. OK or NG
OK >> GO TO 6. NG >> Check cooling fan high speed control circuit. (Go to EC-
460, "PROCEDURE B" .)
4. CHECK COOLING FAN LOW SPEED OPERATION
Without CONSULT-II 1. Disconnect cooling fan relay-2. 2. Start engine and let it idle. 3. Set temperature lever at full cold position. 4. Turn air conditioner switch ON. 5. Turn blower fan switch ON.

[QG18DE]
SEF646X

6. Make sure that cooling fans-1 and -2 operate at low speed.
OK or NG
OK >> GO TO 5. NG >> Check cooling fan low speed control circuit. (Go to EC-
458, "PROCEDURE A" .)

WBIA0058E

SEC163BA

Revision: December 2006

EC-456

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
5. CHECK COOLING FAN HIGH SPEED OPERATION
Without CONSULT-II 1. Turn ignition switch OFF. 2. Reconnect cooling fan relay-2. 3. Turn air conditioner switch and blower fan switch OFF. 4. Disconnect engine coolant temperature sensor harness connector. 5. Connect 150 resistor to engine coolant temperature sensor harness connector. 6. Restart engine and make sure that cooling fan-1 operates at
high speed. OK or NG
OK >> GO TO 6. NG >> Check cooling fan high speed control circuit. (Go to EC-
460, "PROCEDURE B" .)

6. CHECK COOLING SYSTEM FOR LEAK
Refer to CO-8, "CHECKING COOLING SYSTEM FOR LEAKS" . OK or NG
OK >> GO TO 8. NG >> GO TO 7.
7. DETECT MALFUNCTIONING PART
Check the following for leak. G Hose G Radiator G Water pump (Refer to CO-10, "WATER PUMP" .)

>> Repair or replace.
8. CHECK RADIATOR CAP

Refer to CO-9, "CHECKING RADIATOR CAP" . OK or NG
OK >> GO TO 9. NG >> Replace radiator cap.
9. CHECK THERMOSTAT

Refer to CO-12, "THERMOSTAT AND THERMOSTAT HOUSING" . OK or NG
OK >> GO TO 10. NG >> Replace thermostat.
10. CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to EC-462, "Component Inspection" .
OK or NG OK >> GO TO 11. NG >> Replace engine coolant temperature sensor.

Revision: December 2006

EC-457

[QG18DE]
A EC
C D E F
MEC475B
G H I J K L M
2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
11. CHECK MAIN 12 CAUSES
If the cause cannot be isolated, go to EC-461, "Main 12 Causes of Overheating" .
>> INSPECTION END PROCEDURE A
1. CHECK COOLING FAN POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect cooling fan relay-1. 3. Turn ignition switch ON. 4. Check voltage between cooling fan relay-1 terminals 1, 3, 6 and
ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 3. NG >> GO TO 2.

[QG18DE]

2. DETECT MALFUNCTIONING PART
Check the following. G Fuse and fusible link box connectors E23, E25 G Fuse block (J/B) connector E103 G 10A fuse G 40A fusible links G Harness for open or short between cooling fan relay-1 and fuse G Harness for open or short between cooling fan relay-1 and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB0951E

Revision: December 2006

EC-458

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
3. CHECK COOLING FAN MOTOR CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect cooling fan motor-1 harness connector and cooling
fan motor-2 harness connector. 3. Check harness continuity between cooling fan relay-1 terminal 5
and cooling fan motor-1 terminal 1, cooling fan motor-1 terminal 4 and ground. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. 5. Check harness continuity between cooling fan relay-1 terminal 7
and cooling fan motor-2 terminal 2, cooling fan motor-2 terminal 1 and ground. Refer to Wiring Diagram.
Continuity should exist.
6. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK COOLING FAN RELAY-1 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 97 and cooling fan relay-1 terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 6. NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E9, F47 G Harness for open or short between cooling fan relay-1 and ECM

[QG18DE]
A EC
C D
BBIA0153E
E F G H I J K L M

>> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK COOLING FAN RELAY-1
Refer to EC-462, "Component Inspection" . OK or NG
OK >> GO TO 7. NG >> Replace cooling fan relay.
7. CHECK COOLING FAN MOTORS-1 AND -2
Refer to EC-462, "Component Inspection" . OK or NG
OK >> GO TO 8. NG >> Replace cooling fan motors.

Revision: December 2006

EC-459

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
8. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END PROCEDURE B
1. CHECK COOLING FAN POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect cooling fan relay-2. 3. Turn ignition switch ON. 4. Check voltage between cooling fan relay-2 terminals 1, 3 and
ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 3. NG >> GO TO 2.

[QG18DE]

2. DETECT MALFUNCTIONING PART
Check the following. G Fuse and fusible link box connectors E23, E25 G Fuse block (J/B) connector E103 G Harness for open or short between cooling fan relay-2 and fuse G Harness for open or short between cooling fan relay-2 and battery
>> Repair harness or connectors.
3. CHECK COOLING FAN MOTOR CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect cooling fan motor-1 harness connector. 3. Check harness continuity between cooling fan relay-2 terminal 5
and cooling fan motor-1 terminal 2, cooling fan relay-2 terminal 6 and cooling fan motor-1 terminal 3, cooling fan relay-2 terminal 7 and ground. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB0621E BBIA0153E

Revision: December 2006

EC-460

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
4. CHECK COOLING FAN RELAY-2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 89 and cooling fan relay-2 terminal 2.
Refer to Wiring Diagram.
Continuity should exist. 3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 6. NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E9, F47 G Harness for open or short between cooling fan relay-2 and ECM

[QG18DE]
A EC
C D E F

>> Repair open circuit or short to ground or short to power in harness or connectors.

6. CHECK COOLING FAN RELAY-2

G

Refer to EC-462, "Component Inspection" .

OK or NG

H

OK >> GO TO 7. NG >> Replace cooling fan relays.

7. CHECK COOLING FAN MOTOR-1

I

Refer to EC-462, "Component Inspection" .

OK or NG

J

OK >> GO TO 8.
NG >> Replace cooling fan motor. K
8. CHECK INTERMITTENT INCIDENT

Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

L

>> INSPECTION END
Main 12 Causes of Overheating

Engine OFF

Step 1
2

Inspection item G Blocked radiator G Blocked condenser G Blocked radiator grille G Blocked bumper G Coolant mixture

Equipment G Visual
G Coolant tester

3

G Coolant level

G Visual

4

G Radiator cap

G Pressure tester

Standard No blocking

M
UBS00BCT
Reference page --

50 - 50% coolant mixture

See MA-13, "RECOMMENDED FLUIDS AND LUBRICANTS" .

Coolant up to MAX level See MA-16, "Changing in reservoir tank and radi- Engine Coolant" . ator filler neck

59 - 98 kPa (0.6 - 1.0 kg/ SeeCO-9, "CHECKING cm2 , 9 - 14 psi) (Limit) RADIATOR CAP" .

Revision: December 2006

EC-461

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE

[QG18DE]

Engine Step

Inspection item

Equipment

Standard

Reference page

ON*2

5

G Coolant leaks

G Visual

No leaks

See CO-8, "CHECKING COOLING SYSTEM FOR LEAKS" .

ON*2

6

G Thermostat

G Touch the upper and lower radiator hoses

Both hoses should be hot

See CO-12, "THERMOSTAT AND THERMOSTAT HOUSING" and CO-14, "RADIATOR" .

ON*1

7

G Cooling fan

G CONSULT-II

Operating

See trouble diagnosis for DTC P1217 (EC-450 ).

OFF

8

G Combustion gas leak G Color checker chemical Negative

--

tester 4 Gas analyzer

ON*3

9

G Coolant temperature G Visual

Gauge less than 3/4

--

gauge

when driving

G Coolant overflow to reservoir tank

G Visual

No overflow during driv- See MA-16, "Changing

ing and idling

Engine Coolant" .

OFF*4

10 G Coolant return from

G Visual

reservoir tank to radia-

tor

Should be initial level in reservoir tank

See MA-16, "ENGINE MAINTENANCE (QG18DE ENGINE)" .

OFF

11

G Cylinder head

G Straight gauge feeler gauge

0.1 mm (0.004 in) Maxi- See EM-61, "Inspection mum distortion (warping) after Disassembly" .

12 G Cylinder block and pis- G Visual tons

No scuffing on cylinder walls or piston

See EM-71, "Inspection" .

*1: Turn the ignition switch ON. *2: Engine running at 3,000 rpm for 10 minutes. *3: Drive at 90 km/h (56 MPH) for 30 minutes and then let idle for 10 minutes. *4: After 60 minutes of cool down time. For more information, refer to CO-5, "Overheating Cause Analysis" .

Component Inspection
COOLING FAN RELAYS-1 AND -2
Check continuity between terminals 3 and 5, 6 and 7.

UBS00BCU

Conditions 12V direct current supply between terminals 1 and 2 No current supply
If NG, replace relay.

Continuity Yes No

COOLING FAN MOTOR-1 1. Disconnect cooling fan motor harness connectors.
2. Supply cooling fan motor terminals with battery voltage and check operation.

Cooling fan motor

Speed
Low High

Terminals

(+)

(-)

1

4

1, 2

3, 4

Cooling fan motor should operate. If NG, replace cooling fan motor.

Revision: December 2006

EC-462

PBIB0077E
SEF734W
2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE

COOLING FAN MOTOR-2 1. Disconnect cooling fan motor harness connectors.
2. Supply cooling fan motor terminals with battery voltage and check operation.

Cooling fan motor

Terminals

(+)

(-)

2

1

Cooling fan motor should operate. If NG, replace cooling fan motor.

[QG18DE]
A EC
C D
SEF610Y
E F G H I J K L M

Revision: December 2006

EC-463

2006 Sentra

DTC P1225 TP SENSOR
DTC P1225 TP SENSOR
Component Description
Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement. The throttle position sensor has the two sensors. These sensors are a kind of potentiometers which transform the throttle valve position into output voltage, and emit the voltage signal to the ECM. In addition, these sensors detect the opening and closing speed of the throttle valve and feed the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.
On Board Diagnosis Logic
The MIL will not light up for this diagnosis.

[QG18DE]
PFP:16119
UBS00BCV
PBIB0145E UBS00BCW

DTC No.
P1225 1225

Trouble diagnosis name

DTC detecting condition

Possible cause

Closed throttle position Closed throttle position learning value is exces- G Electric throttle control actuator

learning performance sively low.

(TP sensor 1 and 2)

DTC Confirmation Procedure

UBS00BCX

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Turn ignition switch OFF and wait at least 10 seconds. 4. Turn ignition switch ON. 5. If 1st trip DTC is detected, go to EC-465, "Diagnostic Procedure"
.

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-464

2006 Sentra

DTC P1225 TP SENSOR
Diagnostic Procedure
1. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Turn ignition switch OFF. 2. Remove the intake air duct. 3. Check if foreign matter is caught between the throttle valve and
the housing. OK or NG
OK >> GO TO 2. NG >> Remove the foreign matter and clean the electric throttle
control actuator inside.
2. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. 2. Perform EC-80, "Throttle Valve Closed Position Learning" . 3. Perform EC-80, "Idle Air Volume Learning" .
>> INSPECTION END
Removal and Installation
ELECTRIC THROTTLE CONTROL ACTUATOR Refer toEM-15, "OUTER COMPONENT PARTS" .

[QG18DE]
UBS00BCY
A
EC
C
D
E
BBIA0178E
F
G
H
UBS00BCZ
I
J
K
L
M

Revision: December 2006

EC-465

2006 Sentra

DTC P1226 TP SENSOR
DTC P1226 TP SENSOR
Component Description
Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement. The throttle position sensor has the two sensors. These sensors are a kind of potentiometers which transform the throttle valve position into output voltage, and emit the voltage signal to the ECM. In addition, these sensors detect the opening and closing speed of the throttle valve and feed the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.
On Board Diagnosis Logic
The MIL will not light up for this diagnosis.

[QG18DE]
PFP:16119
UBS00BD0
PBIB0145E UBS00BD1

DTC No.
P1226 1226

Trouble diagnosis name

DTC detecting condition

Closed throttle position Closed throttle position learning is not perlearning performance formed successfully, repeatedly.

Possible cause
G Electric throttle control actuator (TP sensor 1 and 2)

DTC Confirmation Procedure

UBS00BD2

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Turn ignition switch OFF and wait at least 10 seconds. 4. Turn ignition switch ON. 5. Repeat steps 3 and 4, 32 times. 6. If 1st trip DTC is detected, go to EC-467, "Diagnostic Procedure"
.

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-466

2006 Sentra

DTC P1226 TP SENSOR
Diagnostic Procedure
1. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Turn ignition switch OFF. 2. Remove the intake air duct. 3. Check if foreign matter is caught between the throttle valve and
the housing. OK or NG
OK >> GO TO 2. NG >> Remove the foreign matter and clean the electric throttle
control actuator inside.
2. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. 2. Perform EC-80, "Throttle Valve Closed Position Learning" . 3. Perform EC-80, "Idle Air Volume Learning" .
>> INSPECTION END
Removal and Installation
ELECTRIC THROTTLE CONTROL ACTUATOR Refer to EM-15, "OUTER COMPONENT PARTS" .

[QG18DE]
UBS00BD3
A
EC
C
D
E
BBIA0178E
F
G
H
UBS00BD4
I
J
K
L
M

Revision: December 2006

EC-467

2006 Sentra

DTC P1564 ASCD STEERING SWITCH

[QG18DE]

DTC P1564 ASCD STEERING SWITCH

PFP:25551

Component Description

UBS00BF7

ASCD steering switch has variant values of electrical resistance for each button. ECM reads voltage variation of switch, and determines which button is operated.

Refer to EC-32 for the ASCD function.

PBIB2599E

CONSULT-II Reference Value in Data Monitor Mode

UBS00BF8

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

MAIN SW

G Ignition switch: ON

MAIN switch: Pressed MAIN switch: Released

ON OFF

CANCEL SW

G Ignition switch: ON

CANCEL switch: Pressed CANCEL switch: Released

ON OFF

RESUME/ACC SW

G Ignition switch: ON

RESUME/ACCELERATE switch: Pressed ON RESUME/ACCELERATE switch: Released OFF

SET SW

G Ignition switch: ON

SET/COAST switch: Pressed SET/COAST switch: Released

ON OFF

On Board Diagnosis Logic

UBS00BF9

This self-diagnosis has the one trip detection logic. The MIL will not light up for this diagnosis.
NOTE: If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to EC-437.

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

P1564 1564

ASCD steering switch

G An excessively high voltage signal from the ASCD steering switch is sent to ECM.
G ECM detects that input signal from the ASCD steering switch is out of the specified range.
G ECM detects that the ASCD steering switch is stuck ON.

G Harness or connectors (The switch circuit is open or shorted.)
G ASCD steering switch G ECM

DTC Confirmation Procedure

UBS00BFA

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Wait at least 10 seconds.

Revision: December 2006

EC-468

2006 Sentra

DTC P1564 ASCD STEERING SWITCH

[QG18DE]

4. Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.

5. Press CANCEL switch for at least 10 seconds, then release it and wait at least 10 seconds.

A

6. Press RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 sec-

onds.

7. Press SET/COAST switch for at least 10 seconds, then release it and wait at least 10 seconds.

EC

8. If DTC is detected, go to EC-471, "Diagnostic Procedure" .

WITH GST

C

Follow the procedure "WITH CONSULT-II" above.

D

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-469

2006 Sentra

Wiring Diagram

DTC P1564 ASCD STEERING SWITCH

[QG18DE]
UBS00BFB

Revision: December 2006

EC-470

BBWA2136E
2006 Sentra

DTC P1564 ASCD STEERING SWITCH

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

67 B/W

Sensor ground

[Engine is running] G Warm-up condition G Idle speed [Ignition switch: ON] G ASCD steering switch: OFF [Ignition switch: ON] G MAIN switch: Pressed

C
Approximately 0V

D
Approximately 4V

Approximately 0V

E

[Ignition switch: ON]

99 W/R

ASCD steering switch

Approximately 1V

G CANCEL switch: Pressed

F

[Ignition switch: ON]

Approximately 3V

G RESUME/ACCELERATE switch: Pressed

[Ignition switch: ON] G SET/COAST switch: Pressed

Approximately 2V

G

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS00BFC
H

1. Turn ignition switch OFF.

2. Loosen and retighten two ground screws on the body.

I

Refer to EC-151, "Ground Inspection" .

J

K

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

L
BBIA0515E
M

Revision: December 2006

EC-471

2006 Sentra

DTC P1564 ASCD STEERING SWITCH
2. CHECK ASCD STEERING SWITCH CIRCUIT

[QG18DE]

With CONSULT-II 1. Turn ignition switch ON. 2. Select "MAIN SW", "RESUME/ACC SW", "SET SW" and "CANCEL SW" in "DATA MONITOR" mode with
CONSULT-II. 3. Check each item indication under the following conditions.

Switch MAIN switch

Monitor item MAIN SW

CANCEL switch

CANCEL SW

RESUME/ACCELERATE switch

RESUME/ACC SW

SET/COAST switch SET SW

Condition Pressed Released Pressed Released Pressed Released Pressed Released

Indication ON OFF ON OFF ON OFF ON OFF

SEC006D

Without CONSULT-II
1. Turn ignition switch ON. 2. Check voltage between ECM terminal 99 and ground with press-
ing each button.

Switch MAIN switch
CANCEL switch
RESUME/ACCELERATE switch
SET/COAST switch
OK or NG OK >> GO TO 8. NG >> GO TO 3.

Condition Pressed Released Pressed Released Pressed Released Pressed Released

Voltage [V] Approx. 0 Approx. 4 Approx. 1 Approx. 4 Approx. 3 Approx. 4 Approx. 2 Approx. 4

PBIB0311E

Revision: December 2006

EC-472

2006 Sentra

DTC P1564 ASCD STEERING SWITCH
3. CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ASCD steering switch harness connector.

[QG18DE]
A EC

C

D

E
PBIB2599E
3. Disconnect ECM harness connector. 4. Disconnect TCM harness connector. 5. Check harness continuity between ASCD steering switch terminal 1 and ECM terminal 67. Refer to Wiring F
Diagram.

Continuity should exist.

G

6. Also check harness for short to ground and short to power.

OK or NG

OK >> GO TO 5.

H

NG >> GO TO 4.

4. DETECT MALFUNCTIONING PART

I

Check the following.

G Harness connectors M401, M102

J

G Harness connectors M59, F27

G Spiral cable

G Harness for open and short between ECM and ASCD steering switch

K

>> Repair open circuit or short to power in harness or connectors.

5. CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

L

1. Check harness continuity between ECM terminal 99 and ASCD steering switch terminal 4. Refer to Wiring Diagram.

M

Continuity should exist.

2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 7. NG >> GO TO 6.

Revision: December 2006

EC-473

2006 Sentra

DTC P1564 ASCD STEERING SWITCH
6. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M401, M102 G Harness connectors M59, F27 G Spiral cable G Harness for open and short between ECM and ASCD steering switch

[QG18DE]

>> Repair open circuit or short to ground or short to ground or short to power in harness or connectors.
7. CHECK ASCD STEERING SWITCH
Refer to EC-474, "Component Inspection" . OK or NG
OK >> GO TO 8. NG >> Replace ASCD steering switch.
8. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
ASCD STEERING SWITCH 1. Disconnect ASCD steering switch.
2. Check continuity between ASCD steering switch terminals 1 and 4 with pushing each switch.

Switch MAIN switch
CANCEL switch RESUME/ACCELERATE switch SET/COAST switch

Condition Pressed Released Pressed Released Pressed Released Pressed Released

Resistance [] Approx. 0
Approx. 4,000 Approx. 250 Approx. 4,000 Approx. 1,480 Approx. 4,000 Approx. 660 Approx. 4,000

UBS00BFD PBIB0934E

Revision: December 2006

EC-474

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH
DTC P1572 ASCD BRAKE SWITCH Component Description
When the brake pedal is depressed, ASCD brake switch is turned OFF and stop lamp switch is turned ON. ECM detects the state of the brake pedal by this input of two kinds (ON/OFF signal). Refer to EC-32, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)" for the ASCD function.

[QG18DE]
PFP:25320
A
UBS00BFE
EC
C

D

CONSULT-II Reference Value in Data Monitor Mode

BBIA0087E
E
UBS00BFF

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

F

Clutch pedal (M/T) and brake pedal: Fully released

ON

BRAKE SW1

G Ignition switch: ON

Clutch pedal (M/T) and/or brake pedal: Depressed

OFF

G

Brake pedal: Fully released

OFF

BRAKE SW2

G Ignition switch: ON

Brake pedal: Slightly Depressed

ON

On Board Diagnosis Logic

H
UBS00BFG

This self-diagnosis has the one trip detection logic.

The MIL will not light up for this diagnosis. I
NOTE:

G If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.

Refer to EC-437 G This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not J

stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.

1st trip DTC is erased when ignition switch OFF. And even when malfunction A is detected in two

consecutive trips, DTC is not stored in ECM memory.

K

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

L
G When the vehicle speed is above 30km/h G Harness or connectors

A)

(19 MPH), ON signals from the stop lamp (The stop lamp switch circuit is shorted.)

switch and the ASCD brake switch are

G Harness or connectors

sent to ECM at the same time.

(The ASCD brake switch circuit is shorted.)

M

G Harness or connectors (The ASCD clutch switch circuit is shorted.) (M/T models)

P1572 1572

ASCD brake switch B)

G ASCD brake switch signal is not sent to ECM for extremely long time while the vehicle is driving

G Stop lamp switch G ASCD brake switch G ASCD clutch switch (M/T models) G Incorrect stop lamp switch installation

G Incorrect ASCD brake switch installation

G Incorrect ASCD clutch switch installation (M/T models)

G ECM

Revision: December 2006

EC-475

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH

[QG18DE]

DTC Confirmation Procedure

UBS00BFH

CAUTION: Always drive vehicle at a safe speed.
NOTE: G If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait
at least 10 seconds before conducting the next test.
G Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for malfunction B. By performing procedure for malfunction A, the incident that causes malfunction B can be detected.
TESTING CONDITION: Steps 4 and 5 may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.

WITH CONSULT-II 1. Start engine.
2. Select "DATA MONITOR" mode with CONSULT-II.
3. Press MAIN switch and make sure that CRUISE indicator lights up.
4. Drive the vehicle for at least 5 consecutive seconds under the following condition.

VHCL SPEED SE Selector lever

More than 30 km/h (19 MPH) Suitable position

If 1st trip DTC is detected, go to EC-480, "Diagnostic Procedure" . If 1st trip DTC is not detected, go to the following step.

PBIB2386E

5. Drive the vehicle for at least 5 consecutive seconds under the following condition.

VHCL SPEED SE

More than 30 km/h (19 MPH)

Selector lever

Suitable position

Driving location

Depress the brake pedal for more than 5 seconds so as not to come off from the above-mentioned vehicle speed.

6. If 1st trip DTC is detected, go to EC-480, "Diagnostic Procedure" .

Revision: December 2006

EC-476

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH

[QG18DE]

Overall Function Check

UBS00KK1

Use this procedure to check the overall function of the ASCD brake switch circuit. During this check, a 1st trip A

DTC might not be confirmed.

WITHOUT CONSULT-II

EC

1. Turn ignition switch ON.

2. Check voltage between ECM terminal 108 (ASCD brake switch

signal) and ground under the following conditions.

C

A/T models

CONDITION

VOLTAGE

Brake pedal: Slightly depressed

Approximately 0V

D

Brake pedal: Fully released

Battery voltage

M/T models

E

CONDITION

VOLTAGE

Clutch pedal and/or brake pedal: Slightly depressed

Approximately 0V

Clutch pedal and brake pedal: Fully released

Battery voltage

3. If NG, go to EC-480, "Diagnostic Procedure" . If OK, go to next step.
4. Check voltage between ECM terminal 101 (Stop lamp switch signal) and ground under the following conditions.

CONDITION

VOLTAGE

Brake pedal: Fully released

Approximately 0V

Brake pedal: Slightly depressed

Battery voltage

5. If NG, go to EC-480, "Diagnostic Procedure" .

MBIB0061E
F G H
I

J
PBIB1677E

K

L

M

Revision: December 2006

EC-477

2006 Sentra

Wiring Diagram

DTC P1572 ASCD BRAKE SWITCH

[QG18DE]
UBS00BFI

Revision: December 2006

EC-478

BBWA2137E
2006 Sentra

DTC P1572 ASCD BRAKE SWITCH

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

101 R/G

Stop lamp switch

[Ignition switch: OFF] G Brake pedal: Fully released [Ignition switch: OFF] G Brake pedal: Slightly depressed

Approximately 0V

C

BATTERY VOLTAGE

(11 - 14V)

D

[Ignition switch: ON]

G Brake pedal: Slightly depressed (A/T) G Clutch pedal and/or brake pedal: Slightly

Approximately 0V

E

108 P/L

ASCD brake switch

depressed (M/T) [Ignition switch: ON]

G Brake pedal: Fully released (A/T)

BATTERY VOLTAGE

F

G Clutch pedal and brake pedal: Fully released (M/ (11 - 14V)

T)

G

H

I

J

K

L

M

Revision: December 2006

EC-479

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH

Diagnostic Procedure
1. CHECK OVERALL FUNCTION-I

With CONSULT-II
1. Turn ignition switch ON.
2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT-II.
3. Check "BRAKE SW1" indication under the following conditions. A/T models

CONDITION Brake pedal: Slightly depressed Brake pedal: Fully released
M/T models

INDICATION OFF ON

CONDITION Clutch pedal and/or brake pedal: Slightly depressed clutch pedal and brake pedal: Fully released

INDICATION OFF ON

Without CONSULT-II
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 108 and ground under the following conditions. A/T models

CONDITION Brake pedal: Slightly depressed Brake pedal: Fully released
M/T models

VOLTAGE Approximately 0V
Battery voltage

CONDITION Clutch pedal and/or brake pedal: Slightly depressed Clutch pedal and brake pedal: Fully released

VOLTAGE Approximately 0V
Battery voltage

OK or NG
OK >> GO TO 2. NG (M/T models) >>GO TO 3. NG (A/T models) >>GO TO 4.

[QG18DE]
UBS00BFJ
SEC011D
MBIB0061E

Revision: December 2006

EC-480

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH

2. CHECK OVERALL FUNCTION-II

With CONSULT-II Check "BRAKE SW2" indication in "DATA MONITOR" mode.

CONDITION Brake pedal: Slightly released Brake pedal: Fully depressed

INDICATION OFF ON

Without CONSULT-II Check voltage between ECM terminal 101 and ground under the following conditions.

CONDITION Brake pedal: Slightly released Brake pedal: Fully depressed

VOLTAGE Approximately 0V
Battery voltage

OK or NG OK >> GO TO 18. NG >> GO TO 13.
3. CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect ASCD clutch switch harness connector. 3. Turn ignition switch ON.

4. Check voltage between ASCD clutch switch terminal 1 and ground under the following conditions with CONSULT-II or tester.

CONDITION
Brake pedal: Fully released
Brake pedal: Slightly depressed
OK or NG OK >> GO TO 10. NG >> GO TO 4.

VOLTAGE Battery voltage
Approx. 0V

Revision: December 2006

EC-481

[QG18DE]
A EC
C D
SEC013D
E F G H
MBIB0060E
I J K L M
BBIA0167E
PBIB0799E
2006 Sentra

DTC P1572 ASCD BRAKE SWITCH
4. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect ASCD brake switch harness connector. 3. Turn ignition switch ON.

[QG18DE]

4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK (M/T models)>>GO TO 6. OK (A/T models)>>GO TO 7. NG >> GO TO 5.

BBIA0087E

5. DETECT MALFUNCTIONING PART
Check the following. G Fuse block (J/B) connector M1 G 10A fuse G Harness for open or short between ASCD brake switch and fuse

PBIB0857E

>> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Check harness continuity between ASCD brake switch terminal 2 and ASCD clutch switch terminal 1.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-482

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH
7. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 108 and ASCD brake switch terminal 2.
Refer to Wiring Diagram.
Continuity should exist. 4. Also check harness for short to ground or short to power. OK or NG
OK >> GO TO 9. NG >> GO TO 8.
8. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and ASCD brake switch

[QG18DE]
A EC
C D E F

>> Repair open circuit or short to ground or short to power in harness or connectors.

G

9. CHECK ASCD BRAKE SWITCH

Refer to EC-485, "Component Inspection" .

H

OK or NG

OK >> GO TO 18.

NG >> Replace ASCD brake switch.

I

10. CHECK ASCD CLUTCH SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

J

2. Disconnect ECM harness connector.

3. Check harness continuity between ECM terminal 108 and ASCD clutch switch terminal 2.

K

Refer to Wiring Diagram.

Continuity should exist.

4. Also check harness for short to ground and short to power.

L

OK or NG

OK >> GO TO 12. NG >> GO TO 11.

M

11. DETECT MALFUNCTIONING PART

Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and ASCD clutch switch

>> Repair open circuit or short to ground or short to power in harness or connectors.
12. CHECK ASCD CLUTCH SWITCH
Refer to EC-485, "Component Inspection" . OK or NG
OK >> GO TO 18. NG >> Replace ASCD clutch switch.

Revision: December 2006

EC-483

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH
13. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect stop lamp switch harness connector.

[QG18DE]

3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-II or tester.

BBIA0105E

Voltage: Battery voltage OK or NG
OK >> GO TO 15. NG >> GO TO 14.
14. DETECT MALFUNCTIONING PART
Check the following. G Fuse block (J/B) connector M2 G 10A fuse G Harness for open or short between stop lamp switch and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
15. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
Refer to Wiring Diagram.
Continuity should exist. 3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 17. NG >> GO TO 16.

PBIB2284E

Revision: December 2006

EC-484

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH
16. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and stop lamp switch

[QG18DE]
A EC

>> Repair open circuit or short to ground or short to power in harness or connectors. C
17. CHECK STOP LAMP SWITCH

Refer to EC-485, "Component Inspection" .

D

OK or NG

OK >> GO TO 18.

NG >> Replace stop lamp switch.

E

18. CHECK INTERMITTENT INCIDENT

Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

F

>> INSPECTION END
Component Inspection
ASCD BRAKE SWITCH 1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector. 3. Check harness continuity between ASCD brake switch terminals
1 and 2 under the following conditions.

Condition Brake pedal: Fully released. Brake pedal: Slightly depressed.

Continuity Should exist. Should not exist.

If NG, adjust ASCD brake switch installation, refer to BR-11, "BRAKE PEDAL AND BRACKET" , and perform step 3 again.

G
UBS00BFK
H
I
J
K

ASCD CLUTCH SWITCH (M/T MODELS) 1. Turn ignition switch OFF. 2. Disconnect ASCD clutch switch harness connector.
3. Check harness continuity between ASCD clutch switch terminals 1 and 2 under the following conditions.

Condition Clutch pedal: Fully released. Clutch pedal: Slightly depressed.

Continuity Should exist. Should not exist.

If NG, adjust ASCD clutch switch installation, refer to CL-6, "CLUTCH SYSTEM" , and perform step 3 again.

SEC023D
L
M

SEC024D

Revision: December 2006

EC-485

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH

[QG18DE]

STOP LAMP SWITCH 1. Turn ignition switch OFF. 2. Disconnect stop lamp switch harness connector. 3. Check harness continuity between stop lamp switch terminals 1 and 2 under the following conditions.

PBIB2285E

Condition Brake pedal: Fully released. Brake pedal: Slightly depressed.

Continuity Should not exist.
Should exist.

If NG, adjust stop lamp switch installation, refer to BR-11, "BRAKE PEDAL AND BRACKET" , and perform step 3 again.

Revision: December 2006

EC-486

2006 Sentra

DTC P1574 ASCD VEHICLE SPEED SENSOR

[QG18DE]

DTC P1574 ASCD VEHICLE SPEED SENSOR Component Description

PFP:31036
A
UBS00BFL

The ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from combination meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD EC control. Refer to EC-32, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)" for ASCD functions.

On Board Diagnosis Logic
This self-diagnosis has the one trip detection logic. The MIL will not light up for this diagnosis.

UBS00BFM
C

NOTE: G If DTC P1574 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC D
U1000, U1001. Refer to EC-152, "DTC U1000, U1001 CAN COMMUNICATION LINE" .

G If DTC P1574 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010.

Refer to EC-155, "DTC U1010 CAN COMMUNICATION" .

E

G If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer to EC-422, "DTC P0500 VSS"
G If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. F Refer to EC-437, "DTC P0605 ECM"

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

G

G Harness or connectors

(The CAN communication line is open or

shorted.)

H

P1574 1574

ASCD vehicle speed ECM detects a difference between two vehicle G Combination meter

sensor

speed signals is out of the specified range.

G Vehicle speed sensor

G TCM

I

G ECM

DTC Confirmation Procedure

UBS00BFN

J

CAUTION: Always drive vehicle at a safe speed.

NOTE:

K

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION: Step 3 may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test

L

is expected to be easier, it is unnecessary to lift the vehicle.

WITH CONSULT-II

M

1. Start engine.

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Drive the vehicle at more than 30 km/h (19 MPH).

4. If DTC is detected, go to EC-488, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

Revision: December 2006

EC-487

SEF058Y
2006 Sentra

DTC P1574 ASCD VEHICLE SPEED SENSOR
Diagnostic Procedure
1. CHECK DTC WITH TCM

[QG18DE]
UBS00BFO

Check DTC with TCM. Refer to AT-38, "ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION" . OK or NG
OK >> GO TO 2. NG >> Perform trouble shooting relevant to DTC indicated.
2. CHECK COMBINATION METER

Refer to DI-7, "Combination Meter" .

>> INSPECTION END

Revision: December 2006

EC-488

2006 Sentra

DTC P1805 BRAKE SWITCH

[QG18DE]

DTC P1805 BRAKE SWITCH Description

PFP:25320
A
UBS00BFW

Brake switch signal is applied to the ECM through the stop lamp switch when the brake pedal is depressed.

This signal is used mainly to decrease the engine speed when the vehicle is driving.

EC

CONSULT-II Reference Value in Data Monitor Mode

UBS00BFX

Specification data are reference values.
MONITOR ITEM

CONDITION

C
SPECIFICATION

Brake pedal: Fully released

OFF

BRAKE SW

G Ignition switch: ON

Brake pedal: Slightly depressed

ON

D

On Board Diagnosis Logic
The MIL will not light up for this diagnosis.

UBS00BFY
E

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P1805 1805

Brake switch

A brake switch signal is not sent to ECM for G Harness or connectors

F

extremely long time while the vehicle is driv- (Stop lamp switch circuit is open or shorted.)

ing.

G Stop lamp switch

FAIL-SAFE MODE

G

When the malfunction is detected, the ECM enters fail-safe mode.

Engine operating condition in fail-safe mode

ECM controls the electric throttle control actuator by regulating the throttle opening to a small range. Therefore, acceleration will be poor.

Vehicle condition

Driving condition

When engine is idling

Normal

When accelerating

Poor acceleration

DTC Confirmation Procedure
WITH CONSULT-II 1. Turn ignition switch ON.
2. Fully depress the brake pedal for at least 5 seconds.
3. Erase the DTC with CONSULT-II.
4. Select "DATA MONITOR" mode with CONSULT-II.
5. If 1st trip DTC is detected, go to EC-491, "Diagnostic Procedure" .

H
I J
UBS00BFZ
K L M

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-489

2006 Sentra

Wiring Diagram

DTC P1805 BRAKE SWITCH

[QG18DE]
UBS00BG0

Revision: December 2006

EC-490

BBWA2138E
2006 Sentra

DTC P1805 BRAKE SWITCH

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

101 R/G

Stop lamp switch

[Ignition switch: OFF] G Brake pedal: Fully released [Ignition switch: OFF] G Brake pedal: Slightly depressed

Approximately 0V

C

BATTERY VOLTAGE

(11 - 14V)

D

Diagnostic Procedure
1. CHECK STOP LAMP SWITCH CIRCUIT

UBS00BG1
E

1. Turn ignition switch OFF.

2. Check the stop lamp when depressing and releasing the brake pedal.

F

Brake pedal

Stop lamp

Fully released

Not illuminated

G

Slightly depressed

Illuminated

OK or NG

OK >> GO TO 4.

H

NG >> GO TO 2.

2. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT I 1. Disconnect stop lamp switch harness connector.

J

K

2. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-II or tester.

L
BBIA0105E
M

Voltage: Battery voltage OK or NG
OK >> GO TO 4. NG >> GO TO 3.
Revision: December 2006

EC-491

PBIB2284E
2006 Sentra

DTC P1805 BRAKE SWITCH
3. DETECT MALFUNCTIONING PART
Check the following. G 10A fuse G Fuse block (J/B) connector M2 G Harness for open and short between stop lamp switch and battery

[QG18DE]

>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Disconnect stop lamp switch harness connector. 4. Check harness continuity between ECM terminal 101 and stop
lamp switch terminal 2. Refer to Wiring Diagram.
Continuity should exist.
5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 6. NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and stop lamp switch

BBIA0105E

>> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK STOP LAMP SWITCH
Refer to EC-493, "Component Inspection" . OK or NG
OK >> GO TO 7. NG >> Replace stop lamp switch.
7. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-492

2006 Sentra

DTC P1805 BRAKE SWITCH
Component Inspection
STOP LAMP SWITCH 1. Disconnect stop lamp switch harness connector.

[QG18DE]
UBS00BG2
A
EC

C

2. Check continuity between stop lamp switch terminals 1 and 2 under the following conditions.

D
BBIA0105E
E

F

G

H
PBIB2285E

Conditions

Continuity

I

Brake pedal: Fully released

Should not exist.

Brake pedal: Slightly depressed

Should exist.

J If NG, adjust brake pedal installation, refer to BR-11, "BRAKE PEDAL AND BRACKET" , and perform step

2 again.

K

L

M

Revision: December 2006

EC-493

2006 Sentra

DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
[QG18DE]

DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY

PFP:16119

Component Description

UBS00BB5

Power supply for the throttle control motor is provided to the ECM via throttle control motor relay. The throttle control motor relay is ON/OFF controlled by the ECM. When the ignition switch is turned ON, the ECM sends an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the ignition switch is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is not provided to the ECM.

CONSULT-II Reference Value in Data Monitor Mode

UBS00BB6

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

THRTL RELAY

G Ignition switch: ON

ON

On Board Diagnosis Logic

UBS00BB7

These self-diagnoses have the one trip detection logic.

DTC No.
P2100 2100
P2103 2103

Trouble diagnosis name

DTC detecting condition

Throttle control motor relay circuit open

ECM detects a voltage of power source for throttle control motor is excessively low.

Throttle control motor relay circuit short

ECM detects the throttle control motor relay is stuck ON.

Possible cause
G Harness or connectors (Throttle control motor relay circuit is open)
G Throttle control motor relay
G Harness or connectors (Throttle control motor relay circuit is shorted)
G Throttle control motor relay

FAIL-SAFE MODE When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.

Engine operating condition in fail-safe mode

ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.

DTC Confirmation Procedure

UBS00BB8

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

PROCEDURE FOR DTC P2100 With CONSULT-II
1. Turn ignition switch ON and wait at least 2 seconds. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for 5 seconds. 4. If DTC is detected, go to EC-498, "Diagnostic Procedure" .

With GST Follow the procedure "With CONSULT-II" above.

Revision: December 2006

EC-494

SEF058Y
2006 Sentra

DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
[QG18DE]

PROCEDURE FOR DTC P2103

TESTING CONDITION:

A

Before performing the following procedure, confirm that battery voltage is more than 8V.

With CONSULT-II

1. Turn ignition switch ON and wait at least 1 second.

EC

2. Select "DATA MONITOR" mode with CONSULT-II.

3. If DTC is detected, go to EC-498, "Diagnostic Procedure" .

C

D

With GST Follow the procedure "With CONSULT-II" above.

E
SEF058Y
F
G

H

I

J

K

L

M

Revision: December 2006

EC-495

2006 Sentra

DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
[QG18DE]

Wiring Diagram

UBS00BB9

Revision: December 2006

EC-496

BBWA2133E
2006 Sentra

DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.
3

WIRE COLOR

ITEM

R/W

Throttle control motor power supply

CONDITION [Ignition switch: ON]

DATA (DC Voltage)
C
BATTERY VOLTAGE (11 - 14V)

0 - 14V

D

[Ignition switch: ON]

4

P

Throttle control motor (Close)

G Engine stopped G Shift lever: D (A/T), 1st (M/T)

E

G Accelerator pedal: Fully released

5

L

Throttle control motor (Open)

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully depressed

0 - 14V

PBIB0534E

F

G

H

104 P

Throttle control motor relay

[Ignition switch: OFF] [Ignition switch: ON]

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

PBIB0533E

BATTERY VOLTAGE

(11 - 14V)

I

0 - 1.0V

J

K

L

M

Revision: December 2006

EC-497

2006 Sentra

DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
Diagnostic Procedure
1. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT

[QG18DE]
UBS00BBA

1. Turn ignition switch OFF. 2. Disconnect throttle control motor relay harness connector.

3. Check voltage between throttle control motor relay terminals 2, 5 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 3. NG >> GO TO 2.

BBIA0102E

2. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E10, F48 G Fuse and fusible link connector E23 G 15A fuse G Harness for open or short between throttle control motor relay and battery

PBIB0575E

>> Repair or replace harness or connectors.
3. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector. 2. Check continuity between ECM terminal 3 and throttle control motor relay terminal 3.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-498

2006 Sentra

DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
[QG18DE]

4. CHECK THROTTLE CONTROL MOTOR RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT A

1. Check continuity between ECM terminal 104 and throttle control motor relay terminal 1. Refer to Wiring Diagram.

Continuity should exist.

EC

2. Also check harness for short to ground and short to power.

OK or NG

C

OK >> GO TO 5.

NG >> Repair open circuit or short to ground or short to power in harness or connectors.

5. CHECK THROTTLE CONTROL MOTOR RELAY

D

Refer to EC-499, "Component Inspection" .

OK or NG

E

OK >> GO TO 6.

NG >> Replace throttle control motor relay.

6. CHECK INTERMITTENT INCIDENT

F

Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

G

>> INSPECTION END
Component Inspection
THROTTLE CONTROL MOTOR RELAY 1. Apply 12V direct current between relay terminals 1 and 2. 2. Check continuity between relay terminals 3 and 5.

H
UBS00BBB
I

Conditions

Continuity

12V direct current supply between terminals 1 and 2

Yes

J

No current supply

No

3. If NG, replace throttle control motor relay.

K

L
PBIB0098E
M

Revision: December 2006

EC-499

2006 Sentra

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
[QG18DE]

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION

PFP:16119

Description

UBS00BAY

NOTE: If DTC P2101 is displayed with DTC P2100 or P2119, first perform the trouble diagnosis for DTC P2100 or P2119. Refer to EC-494 or EC-512 . Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle control motor is operated by the ECM and it opens and closes the throttle valve. The current opening angle of the throttle valve is detected by the throttle position sensor and it provides feedback to the ECM to control the throttle control motor to make the throttle valve opening angle properly in response to driving condition.

On Board Diagnosis Logic

UBS00BAZ

This self-diagnosis has the one trip detection logic.

DTC No.
P2101 2101

Trouble diagnosis name

DTC detecting condition

Electric throttle control Electric throttle control function does not oper-

performance

ate properly.

Possible cause
G Harness or connectors (Throttle control motor circuit is open or shorted)
G Electric throttle control actuator

FAIL-SAFE MODE When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.

Engine operating condition in fail-safe mode

ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.

DTC Confirmation Procedure

UBS00BB0

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11V when engine is running.

WITH CONSULT-II 1. Turn ignition switch ON and wait at least 2 seconds. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for 5 seconds. 4. If DTC is detected, go to EC-502, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-500

2006 Sentra

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
[QG18DE]

Wiring Diagram

UBS00BB1
A

EC

C

D

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-501

BBWA2261E
2006 Sentra

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
[QG18DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

3

R/W

Throttle control motor power supply

[Ignition switch: ON]

BATTERY VOLTAGE (11 - 14V)

0 - 14V

4

P

Throttle control motor (Close)

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully released

5

L

Throttle control motor (Open)

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully depressed

0 - 14V

PBIB0534E

104 P

Throttle control motor relay

[Ignition switch: OFF] [Ignition switch: ON]

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

BATTERY VOLTAGE (11 - 14V)
0 - 1.0V

PBIB0533E

UBS00BB2

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-502

BBIA0515E
2006 Sentra

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION

2. CHECK THROTTLE CONTROL MOTOR RELAY SIGNAL CIRCUIT

Check voltage between ECM terminal 3 and ground under the following conditions with CONSULT-II or tester.

Ignition switch OFF
ON
OK or NG OK >> GO TO 8. NG >> GO TO 3.

Voltage
Approximately 0V
Battery voltage (11 - 14V)

3. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF. 2. Disconnect throttle control motor relay.

[QG18DE]
A
EC
C
D
MBIB0028E
E
F

G

H

3. Check voltage between throttle control motor relay terminals 2, 5 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 5. NG >> GO TO 4.
4. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E10, F48 G 15A fuse G Harness for open or short between throttle control motor relay and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.

BBIA0102E

I

J

K

L
PBIB0575E
M

Revision: December 2006

EC-503

2006 Sentra

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
[QG18DE]
5. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 3 and throttle control motor relay terminal 3.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 6. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK THROTTLE CONTROL MOTOR RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between ECM terminal 104 and throttle control motor relay terminal 1. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 7. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK THROTTLE CONTROL MOTOR RELAY

Refer to EC-505, "Component Inspection" . OK or NG
OK >> GO TO 11. NG >> Replace throttle control motor relay.
8. CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT

1. Turn ignition switch OFF. 2. Disconnect electric throttle control actuator harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between the following terminals.
Refer to Wiring Diagram.

Electric throttle control actuator terminal

ECM terminal

Continuity

4

Should exist

3

5

Should not exist

4

Should not exist

6

5

Should exist

5. Also check harness for short to ground and short to power.
OK or NG OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

BBIA0152E

Revision: December 2006

EC-504

2006 Sentra

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
9. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Remove the intake air duct. 2. Check if foreign matter is caught between the throttle valve and
the housing. OK or NG
OK >> GO TO 10. NG >> Remove the foreign matter and clean the electric throttle
control actuator inside.

[QG18DE]
A EC
C

D

10. CHECK THROTTLE CONTROL MOTOR
Refer to EC-505, "Component Inspection" . OK or NG
OK >> GO TO 11. NG >> GO TO 12.
11. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . OK or NG
OK >> GO TO 12. NG >> Repair or replace harness or connectors.
12. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. 2. Perform EC-80, "Throttle Valve Closed Position Learning" . 3. Perform EC-80, "Idle Air Volume Learning" .

>> INSPECTION END
Component Inspection
THROTTLE CONTROL MOTOR RELAY 1. Apply 12V direct current between relay terminals 1 and 2. 2. Check continuity between relay terminals 3 and 5.

Conditions

Continuity

12V direct current supply between terminals 1 and 2

Yes

No current supply

No

3. If NG, replace throttle control motor relay.

BBIA0178E
E F G H I J K L
UBS00BB3
M

THROTTLE CONTROL MOTOR 1. Disconnect electric throttle control actuator harness connector.

PBIB0098E

Revision: December 2006

EC-505

2006 Sentra

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
2. Check resistance between terminals 3 and 6. Resistance: Approximately 1 - 15  [at 25 °C (77°F)]
3. If NG, replace electric throttle control actuator and go to next step.
4. Perform EC-80, "Throttle Valve Closed Position Learning" . 5. PerformEC-80, "Idle Air Volume Learning" .

[QG18DE]

Removal and Installation
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EM-15, "OUTER COMPONENT PARTS" .

PBIB0095E UBS00BB4

Revision: December 2006

EC-506

2006 Sentra

DTC P2118 THROTTLE CONTROL MOTOR

[QG18DE]

DTC P2118 THROTTLE CONTROL MOTOR Component Description

PFP:16119
A
UBS00BBC

The throttle control motor is operated by the ECM and it opens and closes the throttle valve. The current opening angle of the throttle valve is detected by the throttle position sensor and it provides feed- EC back to the ECM to control the throttle control motor to make the throttle valve opening angle properly in response to driving condition.

On Board Diagnosis Logic

UBS00BBD

C

This self-diagnosis has the one trip detection logic.

DTC No. Trouble diagnosis name

DTC detecting condition

P2118 2118

Throttle control motor circuit short

ECM detects short in both circuits between ECM and throttle control motor.

Possible cause

D

G Harness or connectors (Throttle control motor circuit is shorted.)

G Electric throttle control actuator

E

(Throttle control motor)

FAIL-SAFE MODE

F

When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

Engine operating condition in fail-safe mode
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return G
spring.

DTC Confirmation Procedure

UBS00BBE

H

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test. I

WITH CONSULT-II

1. Turn ignition switch ON and wait at least 2 seconds.

2. Select "DATA MONITOR" mode with CONSULT-II.

J

3. Start engine and let it idle for 5 seconds.

4. If DTC is detected, go to EC-509, "Diagnostic Procedure" . K

L

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

M

Revision: December 2006

EC-507

2006 Sentra

DTC P2118 THROTTLE CONTROL MOTOR Wiring Diagram

[QG18DE]
UBS00BBF

Revision: December 2006

EC-508

BBWA2262E
2006 Sentra

DTC P2118 THROTTLE CONTROL MOTOR

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.
3

WIRE COLOR

ITEM

R/W

Throttle control motor power supply

CONDITION [Ignition switch: ON]

DATA (DC Voltage)
C
BATTERY VOLTAGE (11 - 14V)

0 - 14V

D

[Ignition switch: ON]

4

P

Throttle control motor (Close)

G Engine stopped G Shift lever: D (A/T), 1st (M/T)

E

G Accelerator pedal: Fully released

5

L

Throttle control motor (Open)

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully depressed

0 - 14V

PBIB0534E

F

G

H

104 P

Throttle control motor relay

[Ignition switch: OFF] [Ignition switch: ON]

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

PBIB0533E

BATTERY VOLTAGE

(11 - 14V)

I

0 - 1.0V

J

UBS00BBG

K

L

M

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-509

BBIA0515E
2006 Sentra

DTC P2118 THROTTLE CONTROL MOTOR

[QG18DE]

2. CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT

1. Turn ignition switch OFF. 2. Disconnect electric throttle control actuator harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between the following terminals.
Refer to Wiring Diagram.

Electric throttle control actuator terminal

ECM terminal

Continuity

4

Should exist

3

5

Should not exist

4

Should not exist

6

5

Should exist

5. Also check harness for short to ground and short to power.
OK or NG OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

3. CHECK THROTTLE CONTROL MOTOR

BBIA0152E

Refer to EC-510, "Component Inspection" . OK or NG
OK >> GO TO 4. NG >> GO TO 5.
4. CHECK INTERMITTENT INCIDENT

Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . OK or NG
OK >> GO TO 5. NG >> Repair or replace harness or connectors.
5. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1. Replace the electric throttle control actuator. 2. Perform EC-80, "Throttle Valve Closed Position Learning" . 3. Perform EC-80, "Idle Air Volume Learning" .

>> INSPECTION END
Component Inspection
THROTTLE CONTROL MOTOR 1. Disconnect electric throttle control actuator harness connector. 2. Check resistance between terminals 3 and 6.
Resistance: Approximately 1 - 15  [at 25 °C (77°F)]
3. If NG, replace electric throttle control actuator and go to next step.
4. Perform EC-80, "Throttle Valve Closed Position Learning" . 5. Perform EC-80, "Idle Air Volume Learning" .

UBS00BBH

Revision: December 2006

EC-510

PBIB0095E
2006 Sentra

DTC P2118 THROTTLE CONTROL MOTOR
Removal and Installation
ELECTRIC THROTTLE CONTROL ACTUATOR Refer to EM-15, "OUTER COMPONENT PARTS" .

[QG18DE]
UBS00BBI
A EC
C D E F G H I J K L M

Revision: December 2006

EC-511

2006 Sentra

DTC P2119 ELECTRIC THROTTLE CONTROL ACTUATOR
[QG18DE]

DTC P2119 ELECTRIC THROTTLE CONTROL ACTUATOR

PFP:16119

Component Description

UBS00BAU

Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle control motor is operated by the ECM and it opens and closes the throttle valve. The throttle position sensor detects the throttle valve position, and the opening and closing speed of the throttle valve and feeds the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.

On Board Diagnosis Logic

UBS00BAV

This self-diagnosis has the one trip detection logic.

DTC No. Trouble diagnosis name

P2119 2119

A)

Electric throttle control

actuator

B)

C)

DTC detecting condition

Possible cause

Electric throttle control actuator does not function properly due to the return spring malfunction.
Throttle valve opening angle in fail-safe mode is not in specified range.

G Electric throttle control actuator

ECM detects the throttle valve is stuck open.

FAIL-SAFE MODE When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.

Detected items

Engine operating condition in fail-safe mode

Malfunction A

The ECM controls the electric throttle control actuator by regulating the throttle opening around the idle position. The engine speed will not rise more than 2,000 rpm.

Malfunction B

ECM controls the electric throttle control actuator by regulating the throttle opening to 20 degrees or less.

Malfunction C

While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops, the engine stalls. The engine can restart in N or P position (A/T), Neutral position (M/T) and engine speed will not exceed 1,000 rpm or more.

DTC Confirmation Procedure

UBS00BAW

NOTE: G Perform PROCEDURE FOR MALFUNCTION A AND B first. If the DTC cannot be confirmed, perform
PROCEDURE FOR MALFUNCTION C.
G If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

PROCEDURE FOR MALFUNCTION A AND B With CONSULT-II
1. Turn ignition switch ON and wait at least 1 second.
2. Select "DATA MONITOR" mode with CONSULT-II. 3. Shift selector lever to D position (A/T), 1st position (M/T) and
wait at least 3 seconds. 4. Shift selector lever to P or N position (A/T), Neutral position (M/
T).
5. Turn ignition switch OFF, wait at least 10 seconds, and then turn ON.
6. Turn ignition switch ON and wait at least 1 second.
7. Shift selector lever to D position (A/T), 1st position (M/T), and wait at least 3 seconds.
8. Shift selector lever to P or N position (A/T), Neutral position (M/ T).
9. Turn ignition switch OFF, wait at least 10 seconds, and then turn ON.
10. If DTC is detected, go to EC-513, "Diagnostic Procedure" .

SEF058Y

Revision: December 2006

EC-512

2006 Sentra

DTC P2119 ELECTRIC THROTTLE CONTROL ACTUATOR
[QG18DE]

With GST

Follow the procedure "With CONSULT-II" above.

A

PROCEDURE FOR MALFUNCTION C

With CONSULT-II

EC

1. Turn ignition switch ON and wait at least 1 second.

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Shift selector lever to D position (A/T), 1st position (M/T) and

C

wait at least 2 seconds.

4. Shift selector lever to N or P position.

5. Start engine and let it idle for 3 seconds.

D

6. If DTC is detected, go to EC-513, "Diagnostic Procedure" .

E

With GST Follow the procedure "With CONSULT-II" above.
Diagnostic Procedure
1. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Remove the intake air duct. 2. Check if a foreign matter is caught between the throttle valve
and the housing. OK or NG
OK >> GO TO 2. NG >> Remove the foreign matter and clean the electric throttle
control actuator inside.

SEF058Y
F

UBS00BAX

G

H

I

J

2. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. 2. Perform EC-80, "Throttle Valve Closed Position Learning" . 3. Perform EC-80, "Idle Air Volume Learning" .
>> INSPECTION END

K
BBIA0178E
L
M

Revision: December 2006

EC-513

2006 Sentra

DTC P2122, P2123 APP SENSOR

[QG18DE]

DTC P2122, P2123 APP SENSOR

PFP:18002

Component Description

UBS00BG3

The accelerator pedal position sensor is installed on the upper end

of the accelerator pedal assembly. The sensor detects the accelera-

tor position and sends a signal to the ECM.

Accelerator pedal position sensor has two sensors. These sensors

are a kind of potentiometers which transform the accelerator pedal

position into output voltage, and emit the voltage signal to the ECM.

In addition, these sensors detect the opening and closing speed of

the accelerator pedal and feed the voltage signals to the ECM. The

ECM judges the current opening angle of the accelerator pedal from

these signals and controls the throttle control motor based on these

signals. Idle position of the accelerator pedal is determined by the ECM

PBIB1741E

receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for the engine oper-

ation such as fuel cut.

CONSULT-II Reference Value in Data Monitor Mode

UBS00BG4

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

ACCEL SEN 1

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released Accelerator pedal: Fully depressed

0.65 - 0.87V More than 4.3V

ACCEL SEN 2*

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released Accelerator pedal: Fully depressed

0.56 - 0.96V More than 4.0V

CLSD THL POS

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released Accelerator pedal: Slightly depressed

ON OFF

*: Accelerator pedal sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.

On Board Diagnosis Logic

UBS00BG5

These self-diagnoses have the one trip detection logic.
NOTE: If DTC P2122 or P2123 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to EC-440, "DTC P0643 SENSOR POWER SUPPLY" .

DTC No. P2122 2122
P2123 2123

Trouble diagnosis name Accelerator pedal position sensor 1 circuit low input
Accelerator pedal position sensor 1 circuit high input

DTC detecting condition An excessively low voltage from the APP sensor 1 is sent to ECM.
An excessively high voltage from the APP sensor 1 is sent to ECM.

Possible cause
G Harness or connectors (The APP sensor 1 circuit is open or shorted.)
G Accelerator pedal position sensor (Accelerator pedal position sensor 1)

FAIL-SAFE MODE When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
Engine operating condition in fail-safe mode
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of throttle valve to be slower than the normal condition. So, the acceleration will be poor.

Revision: December 2006

EC-514

2006 Sentra

DTC P2122, P2123 APP SENSOR

[QG18DE]

DTC Confirmation Procedure

UBS00BG6

NOTE:

A

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

EC

Before performing the following procedure, confirm that battery voltage is more than 8V at idle.

WITH CONSULT-II

1. Turn ignition switch ON.

C

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Start engine and let it idle for 1 second.

D

4. If DTC is detected, go to EC-517, "Diagnostic Procedure" .

E

WITH GST Follow the procedure "WITH CONSULT-II" above.

F
SEF058Y
G
H

I

J

K

L

M

Revision: December 2006

EC-515

2006 Sentra

Wiring Diagram

DTC P2122, P2123 APP SENSOR

[QG18DE]
UBS00BG7

Revision: December 2006

EC-516

BBWA1485E
2006 Sentra

DTC P2122, P2123 APP SENSOR

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

82 B/Y 83 G 90 R

Sensor ground (Accelerator pedal position sensor 1)
Sensor ground (Accelerator pedal position sensor 2)
Sensor power supply (Accelerator pedal position sensor 1)

[Engine is running] G Warm-up condition G Idle speed [Engine is running] G Warm-up condition G Idle speed
[Ignition switch: ON]

C
Approximately 0V
D
Approximately 0V
E
Approximately 5V

91 R/G

Sensor power supply (Accelerator pedal position sensor 2)

[Ignition switch: ON]

F
Approximately 5V

98 R/B

Accelerator pedal position sensor 2

106 W

Accelerator pedal position sensor 1

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully released
[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully depressed
[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully released
[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully depressed

0.28 - 0.48V More than 2.0V 0.65 - 0.87V More than 4.3V

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

G H I J K
UBS00BG8
L M

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-517

BBIA0515E
2006 Sentra

DTC P2122, P2123 APP SENSOR
2. CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.

[QG18DE]

3. Check voltage between APP sensor terminal 2 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 4. NG >> GO TO 3.

BBIA0104E

3. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M58, F26 G Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK APP SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 82 and APP sensor terminal 4.
Refer to Wiring Diagram.
Continuity should exist. 4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 6. NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M58, F26 G Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB0811E

Revision: December 2006

EC-518

2006 Sentra

DTC P2122, P2123 APP SENSOR
6. CHECK APP SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 106 and APP sensor terminal 3. Refer to Wiring Diagram. Continuity should exist.
2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 8. NG >> GO TO 7.
7. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M58, F26 G Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK APP SENSOR
Refer to EC-520, "Component Inspection" . OK or NG
OK >> GO TO 10. NG >> GO TO 9.
9. REPLACE ACCELERATOR PEDAL ASSENBLY
1. Replace accelerator pedal assembly. 2. Perform EC-79, "Accelerator Pedal Released Position Learning" . 3. Perform EC-80, "Throttle Valve Closed Position Learning" . 4. Perform EC-80, "Idle Air Volume Learning" .
>> INSPECTION END
10. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

[QG18DE]
A EC
C D E F G H I J K L

>> INSPECTION END

M

Revision: December 2006

EC-519

2006 Sentra

DTC P2122, P2123 APP SENSOR

Component Inspection
ACCELERATOR PEDAL POSITION SENSOR 1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Check voltage between ECM terminals 106 (APP sensor 1 signal), 98 (APP sensor 2 signal) and ground under the following conditions.

Terminal

Accelerator pedal

Voltage

106 (Accelerator pedal position sensor 1)

Fully released Fully depressed

0.65 - 0.87V More than 4.3V

98 (Accelerator pedal position sensor 2)

Fully released Fully depressed

0.28 - 0.48V More than 2.0V

4. If NG, replace accelerator pedal assembly and go to the next step.
5. Perform EC-79, "Accelerator Pedal Released Position Learning" . 6. Perform EC-80, "Throttle Valve Closed Position Learning" . 7. Perform EC-80, "Idle Air Volume Learning" .

Removal and Installation
ACCELERATOR PEDAL
Refer to ACC-2, "ACCELERATOR CONTROL SYSTEM" .

[QG18DE]
UBS00BG9
MBIB0023E UBS00BGA

Revision: December 2006

EC-520

2006 Sentra

DTC P2127, P2128 APP SENSOR

[QG18DE]

DTC P2127, P2128 APP SENSOR Component Description

PFP:18002
A
UBS0 0 BG B

The accelerator pedal position sensor is installed on the upper end

of the accelerator pedal assembly. The sensor detects the accelera-

EC

tor position and sends a signal to the ECM.

Accelerator pedal position sensor has two sensors. These sensors

are a kind of potentiometers which transform the accelerator pedal

position into output voltage, and emit the voltage signal to the ECM.

C

In addition, these sensors detect the opening and closing speed of

the accelerator pedal and feed the voltage signals to the ECM. The

ECM judges the current opening angle of the accelerator pedal from

D

these signals and controls the throttle control motor based on these

signals.

Idle position of the accelerator pedal is determined by the ECM

PBIB1741E

receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for the engine oper-

E

ation such as fuel cut.

CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.

UBS0 0BG C

F

MONITOR ITEM

CONDITION

SPECIFICATION

G

ACCEL SEN 1

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released Accelerator pedal: Fully depressed

0.65 - 0.87V More than 4.3V

ACCEL SEN 2*

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released Accelerator pedal: Fully depressed

0.56 - 0.96V More than 4.0V

H

CLSD THL POS

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released

ON

Accelerator pedal: Slightly depressed OFF

I

*: Accelerator pedal sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.

On Board Diagnosis Logic

UBS0 0BG D

J

These self-diagnoses have the one trip detection logic.

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

K

P2127 2127

Accelerator pedal position sensor 2 circuit low input

An excessively low voltage from the APP sensor 2 is sent to ECM.

G Harness or connectors (The APP sensor 2 circuit is open or shorted.) (The TP sensor circuit is shorted)

L

P2128 2128

Accelerator pedal position sensor 2 circuit high input

An excessively high voltage from the APP sensor 2 is sent to ECM.

G Accelerator pedal position sensor (APP sensor 2)
G Electric throttle control actuator

M

(TP sensor 1 and 2)

FAIL-SAFE MODE When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.
Engine operating condition in fail-safe mode
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. So, the acceleration will be poor.

Revision: December 2006

EC-521

2006 Sentra

DTC P2127, P2128 APP SENSOR

[QG18DE]

DTC Confirmation Procedure

UBS00BGE

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 8V at idle.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for 1 second. 4. If DTC is detected, go to EC-524, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-522

2006 Sentra

Wiring Diagram

DTC P2127, P2128 APP SENSOR

[QG18DE]
UBS00BGF
A EC
C D E F G H I J K L M

Revision: December 2006

EC-523

BBWA1486E
2006 Sentra

DTC P2127, P2128 APP SENSOR

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

47 B

Sensor power supply (Throttle position sensor)

[Ignition switch: ON]

Approximately 5V

82 B/Y

Sensor ground (Accelerator pedal position sensor 1)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

83 G

Sensor ground (Accelerator pedal position sensor 2)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

90 R

Sensor power supply (Accelerator pedal position sensor 1)

[Ignition switch: ON]

Approximately 5V

91 R/G

Sensor power supply (Accelerator pedal position sensor 2)

[Ignition switch: ON]

Approximately 5V

98 R/B

Accelerator pedal position sensor 2

[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully depressed

0.28 - 0.48V More than 2.0V

106 W

Accelerator pedal position sensor 1

[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully released
[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully depressed

0.65 - 0.87V More than 4.3V

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS00BGG

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-524

BBIA0515E
2006 Sentra

DTC P2127, P2128 APP SENSOR
2. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.

[QG18DE]
A EC

C

3. Check voltage between APP sensor terminal 1 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 8. NG >> GO TO 3.

D
BBIA0104E
E
F
G

3. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between APP sensor terminal 1 and ECM terminal 91.
Refer to Wiring Diagram.
Continuity should exist.
OK or NG OK >> GO TO 5. NG >> GO TO 4.
4. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M58, F26 G Harness for open between ECM and accelerator pedal position sensor

>> Repair open circuit.
5. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III

Check harness for short to power and short to ground, between the following terminals.

ECM terminal

Sensor terminal

Reference Wiring Diagram

91

APP sensor terminal 1

EC-523

47

Electric throttle control actuator terminal 1

EC-530

OK or NG
OK >> GO TO 6. NG >> Repair short to ground or short to power in harness or connectors.

PBIB0812E

H

I

J

K

L

M

Revision: December 2006

EC-525

2006 Sentra

DTC P2127, P2128 APP SENSOR
6. CHECK THROTTLE POSITION SENSOR
Refer to EC-534, "Component Inspection" . OK or NG
OK >> GO TO 14. NG >> GO TO 7.
7. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. 2. Perform EC-80, "Throttle Valve Closed Position Learning" . 3. Perform EC-80, "Idle Air Volume Learning" .

[QG18DE]

>> INSPECTION END
8. CHECK APP SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 83 APP sensor terminal 5.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 10. NG >> GO TO 9.
9. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M58, F26 G Harness for open or short between ECM and accelerator pedal position sensor

>> Repair open circuit or short to ground or short to power in harness or connectors.
10. CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 98 and APP sensor terminal 6. Refer to Wiring Diagram.
Continuity should exist. 2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 12. NG >> GO TO 11.
11. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M58, F26 G Harness for open or short between ECM and accelerator pedal position sensor

>> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-526

2006 Sentra

DTC P2127, P2128 APP SENSOR

12. CHECK APP SENSOR
Refer to EC-542, "Component Inspection" . OK or NG
OK >> GO TO 14. NG >> Replace accelerator pedal assembly.
13. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. 2. Perform EC-79, "Accelerator Pedal Released Position Learning" . 3. Perform EC-80, "Throttle Valve Closed Position Learning" . 4. Perform EC-80, "Idle Air Volume Learning" .

>> INSPECTION END
14. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
ACCELERATOR PEDAL POSITION SENSOR 1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Check voltage between ECM terminals 106 (APP sensor 1 signal), 98 (APP sensor 2 signal) and ground under the following conditions.

Terminal

Accelerator pedal

Voltage

106 (Accelerator pedal position sensor 1)

Fully released Fully depressed

0.65 - 0.87V More than 4.3V

98 (Accelerator pedal position sensor 2)

Fully released Fully depressed

0.28 - 0.48V More than 2.0V

4. If NG, replace accelerator pedal assembly. 5. Perform EC-79, "Accelerator Pedal Released Position Learning" . 6. Perform EC-80, "Throttle Valve Closed Position Learning" . 7. Perform EC-80, "Idle Air Volume Learning" .

Removal and Installation
ACCELERATOR PEDAL
Refer to ACC-2, "ACCELERATOR CONTROL SYSTEM" .

[QG18DE]
A EC
C D E F G
UBS0 0BG H
H I J K L
MBIB0023E
M
UBS00BGI

Revision: December 2006

EC-527

2006 Sentra

DTC P2135 TP SENSOR

[QG18DE]

DTC P2135 TP SENSOR

PFP:16119

Component Description

UBS00BGJ

Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement. The throttle position sensor has the two sensors. These sensors are a kind of potentiometers which transform the throttle valve position into output voltage, and emit the voltage signal to the ECM. In addition, these sensors detect the opening and closing speed of the throttle valve and feed the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.

PBIB0145E

CONSULT-II Reference Value in Data Monitor Mode

UBS00BGK

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

THRTL SEN 1 THRTL SEN 2*

G Ignition switch: ON (Engine stopped)
G Shift lever: D (A/T), 1st (M/T)

Accelerator pedal: Fully released
Accelerator pedal: Fully depressed

More than 0.36V Less than 4.75V

*: Throttle position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.

On Board Diagnosis Logic

UBS00BGL

This self-diagnosis has the one trip detection logic.

DTC No.
P2135 2135

Trouble diagnosis name
Throttle position sensor circuit range/performance

DTC detecting condition
Rationally incorrect voltage is sent to ECM compared with the signals from TP sensor 1 and TP sensor 2.

Possible cause
G Harness or connector (The TP sensor 1 and 2 circuit is open or shorted.) (The APP sensor 2 circuit is shorted)
G Electric throttle control actuator (TP sensor 1 and 2)
G Accelerator pedal position sensor (APP sensor 2)

FAIL-SAFE MODE When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
Engine operation condition in fail-safe mode
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. So, the acceleration will be poor.

Revision: December 2006

EC-528

2006 Sentra

DTC P2135 TP SENSOR

[QG18DE]

DTC Confirmation Procedure

UBS00BGM

NOTE:

A

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

EC

Before performing the following procedure, confirm that battery voltage is more than 8V at idle.

WITH CONSULT-II

1. Turn ignition switch ON.

C

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Start engine and let it idle for 1 second.

D

4. If DTC is detected, go to EC-531, "Diagnostic Procedure" .

E

WITH GST Follow the procedure "WITH CONSULT-II" above.

F
SEF058Y
G
H

I

J

K

L

M

Revision: December 2006

EC-529

2006 Sentra

Wiring Diagram

DTC P2135 TP SENSOR

[QG18DE]
UBS00BGN

Revision: December 2006

EC-530

BBWA2140E
2006 Sentra

DTC P2135 TP SENSOR

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

47 B

Sensor power supply (Throttle position sensor)

[Ignition switch: ON]

Approximately 5V

C

[Ignition switch: ON]

G Engine stopped

More than 0.36V

D

G Shift lever: D (A/T), 1st (M/T)

G Accelerator pedal: Fully released

50 W

Throttle position sensor 1

[Ignition switch: ON]

E

G Engine stopped G Shift lever: D (A/T), 1st (M/T)

Less than 4.75V

G Accelerator pedal: Fully depressed

F

66 R

Sensor ground (Throttle position sensor)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V
G

69 G

Throttle position sensor 2

91 R/G

Sensor power supply (Accelerator pedal position sensor 2)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1st (M/T) G Accelerator pedal: Fully depressed
[Ignition switch: ON]

Less than 4.75V More than 0.36V Approximately 5V

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

H
I J K
UBS00BGO
L M

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-531

BBIA0515E
2006 Sentra

DTC P2135 TP SENSOR
2. CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT-I
1. Disconnect electric throttle control actuator harness connector. 2. Turn ignition switch ON.

[QG18DE]

3. Check voltage between electric throttle control actuator terminal 1 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 7. NG >> GO TO 3.

BBIA0152E

3. CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT-II

PBIB0082E

1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between electric throttle control actuator terminal 1 and ECM terminal 47.
Refer to Wiring Diagram.
Continuity should exist.
OK or NG OK >> GO TO 4. NG >> Repair open circuit.
4. CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT-III

Check harness for short to power and short to ground, between the following terminals.

ECM terminal

Sensor terminal

Reference Wiring Diagram

47

Electric throttle control actuator terminal 1

EC-530

91

APP sensor terminal 1

EC-516

OK or NG
OK >> GO TO 5. NG >> Repair short to ground or short to power in harness or connectors.

5. CHECK APP SENSOR

Refer to EC-527, "Component Inspection" .
OK or NG OK >> GO TO 11. NG >> GO TO 6.

Revision: December 2006

EC-532

2006 Sentra

DTC P2135 TP SENSOR
6. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. 2. Perform EC-79, "Accelerator Pedal Released Position Learning" . 3. Perform EC-80, "Throttle Valve Closed Position Learning" . 4. Perform EC-80, "Idle Air Volume Learning" .

[QG18DE]
A EC

C >> INSPECTION END

7. CHECK THROTTLE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT D 1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between ECM terminal 66 and electric throttle control actuator terminal 5.

E

Refer to Wiring Diagram.

Continuity should exist. F
4. Also check harness for short to ground and short to power.

OK or NG

OK >> GO TO 8.

G

NG >> Repair open circuit or short to ground or short to power in harness or connectors.

8. CHECK THROTTLE POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

H

1. Check harness continuity between ECM terminal 50 and electric throttle control actuator terminal 4, ECM

terminal 69 and electric throttle control actuator terminal 2.

Refer to Wiring Diagram.

I

Continuity should exist.

2. Also check harness for short to ground and short to power.

J

OK or NG

OK >> GO TO 9.

NG >> Repair open circuit or short to ground or short to power in harness or connectors.

K

9. CHECK THROTTLE POSITION SENSOR

Refer to EC-308, "Component Inspection" .

L

OK or NG

OK >> GO TO 11.

NG >> GO TO 10.

M

10. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1. Replace the electric throttle control actuator. 2. Perform EC-80, "Throttle Valve Closed Position Learning" . 3. Perform EC-80, "Idle Air Volume Learning" .

>> INSPECTION END
11. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-533

2006 Sentra

DTC P2135 TP SENSOR

Component Inspection
THROTTLE POSITION SENSOR 1. Reconnect all harness connectors disconnected.
2. Perform EC-80, "Throttle Valve Closed Position Learning" .
3. Turn ignition switch ON.
4. Set selector lever to D position (A/T models) or 1st position (M/T models).
5. Check voltage between ECM terminals 50 (TP sensor 1 signal), 69 (TP sensor 2 signal) and ground under the following conditions.

Terminal

Accelerator pedal

Voltage

50 (Throttle position sensor 1)

Fully released Fully depressed

More than 0.36V Less than 4.75V

69 (Throttle position sensor 2)

Fully released Fully depressed

Less than 4.75V More than 0.36V

6. If NG, replace electric throttle control actuator and go to the next step.
7. Perform EC-80, "Throttle Valve Closed Position Learning" .
8. Perform EC-80, "Idle Air Volume Learning" .

Removal and Installation
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EM-15, "Removal and Installation" .

[QG18DE]
UBS00BGP
PBIB1060E UBS00BGQ

Revision: December 2006

EC-534

2006 Sentra

DTC P2138 APP SENSOR

[QG18DE]

DTC P2138 APP SENSOR Component Description

PFP:18002
A
UBS0 0BG R

The accelerator pedal position sensor is installed on the upper end

of the accelerator pedal assembly. The sensor detects the accelera-

EC

tor position and sends a signal to the ECM.

Accelerator pedal position sensor has two sensors. These sensors

are a kind of potentiometers which transform the accelerator pedal

position into output voltage, and emit the voltage signal to the ECM.

C

In addition, these sensors detect the opening and closing speed of

the accelerator pedal and feed the voltage signals to the ECM. The

ECM judges the current opening angle of the accelerator pedal from

D

these signals and controls the throttle control motor based on these

signals.

Idle position of the accelerator pedal is determined by the ECM

PBIB1741E

receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for the engine oper-

E

ation such as fuel cut.

CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.

UBS0 0 BG S

F

MONITOR ITEM

CONDITION

SPECIFICATION

G

ACCEL SEN 1

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released Accelerator pedal: Fully depressed

0.65 - 0.87V More than 4.3V

ACCEL SEN 2*

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released Accelerator pedal: Fully depressed

0.56 - 0.96V More than 4.0V

H

CLSD THL POS

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released Accelerator pedal: Slightly depressed

ON OFF

I

*: Accelerator pedal sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.

On Board Diagnosis Logic

UBS00BGT

J

This self-diagnosis has the one trip detection logic.
NOTE: If DTC P2138 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to K EC-440, "DTC P0643 SENSOR POWER SUPPLY" .

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

L

G Harness or connector

(The APP sensor 1 and 2 circuit is

open or shorted.)

P2138 2138

Accelerator pedal position sensor circuit range/performance

Rationally incorrect voltage is sent to ECM compared with the signals from APP sensor 1 and APP sensor 2.

(The TP sensor circuit is shorted.)
G Accelerator pedal position sensor 1 and 2

M

G Electric throttle control actuator (TP sensor 1 and 2)

FAIL-SAFE MODE When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
Engine operating condition in fail-safe mode
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of throttle valve to be slower than the normal condition. So, the acceleration will be poor.

Revision: December 2006

EC-535

2006 Sentra

DTC P2138 APP SENSOR

[QG18DE]

DTC Confirmation Procedure

UBS00BGU

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 8V at idle.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for 1 second. 4. If DTC is detected, go to EC-538, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-536

2006 Sentra

Wiring Diagram

DTC P2138 APP SENSOR

[QG18DE]
UBS0 0 BG V
A EC
C D E F G H I J K L M

Revision: December 2006

EC-537

BBWA1487E
2006 Sentra

DTC P2138 APP SENSOR

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

47 B

Sensor power supply (Throttle position sensor)

[Ignition switch: ON]

Approximately 5V

82 B/Y

Sensor ground (Accelerator pedal position sensor 1)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

83 G

Sensor ground (Accelerator pedal position sensor 2)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

90 R

Sensor power supply (Accelerator pedal position sensor 1)

[Ignition switch: ON]

Approximately 5V

91 R/G

Sensor power supply (Accelerator pedal position sensor 2)

[Ignition switch: ON]

Approximately 5V

98 R/B

Accelerator pedal position sensor 2

[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully depressed

0.28 - 0.48V More than 2.0V

106 W

Accelerator pedal position sensor 1

[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully released
[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully depressed

0.65 - 0.87V More than 4.3V

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS00BGW

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-538

BBIA0515E
2006 Sentra

DTC P2138 APP SENSOR
2. CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.

[QG18DE]
A EC

C

3. Check voltage between APP sensor terminal 2 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 4. NG >> GO TO 3.

D
BBIA0104E
E
F
G

3. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M58, F26 G Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
Check voltage between APP sensor terminal 1 and ground with CONSULT-II or tester.
Voltage: Approximately 5V OK or NG
OK >> GO TO 10. NG >> GO TO 5.

PBIB0811E

H

I

J

K

L

M

PBIB2039E

Revision: December 2006

EC-539

2006 Sentra

DTC P2138 APP SENSOR
5. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between APP sensor terminal 1 and ECM terminal 91.
Refer to Wiring Diagram.
Continuity should exist. OK or NG
OK >> GO TO 7. NG >> GO TO 6.
6. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M58, F26 G Harness for open between ECM and accelerator pedal position sensor

[QG18DE]

>> Repair open circuit.
7. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III

Check harness for short to power and short to ground, between the following terminals.

ECM terminal

Sensor terminal

Reference Wiring Diagram

91

APP sensor terminal 1

EC-537

47

Electric throttle control actuator terminal 1

EC-530

OK or NG
OK >> GO TO 8. NG >> Repair short to ground or short to power in harness or connectors.

8. CHECK THROTTLE POSITION SENSOR

Refer to EC-534, "Component Inspection" . OK or NG
OK >> GO TO 16. NG >> GO TO 9.
9. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1. Replace the electric throttle control actuator. 2. Perform EC-80, "Throttle Valve Closed Position Learning" . 3. Perform EC-80, "Idle Air Volume Learning" .

>> INSPECTION END

Revision: December 2006

EC-540

2006 Sentra

DTC P2138 APP SENSOR

[QG18DE]

10. CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT A

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector. 3. Check harness continuity between APP sensor terminal 4 and ECM terminal 82, APP sensor terminal 5 EC
and ECM terminal 83. Refer to Wiring Diagram.

Continuity should exist.

C

4. Also check harness for short to ground and short to power.

OK or NG

D

OK >> GO TO 12. NG >> GO TO 11.

11. DETECT MALFUNCTIONING PART

E

Check the following.

G Harness connectors M58, F26

F

G Harness for open or short between ECM and accelerator pedal position sensor

G >> Repair open circuit or short to ground or short to power in harness or connectors.

12. CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT H

1. Check harness continuity between ECM terminal 106 and APP sensor terminal 3, ECM terminal 98 and

APP sensor terminal 6.

Refer to Wiring Diagram.

I

Continuity should exist.

2. Also check harness for short to ground and short to power. J
OK or NG

OK >> GO TO 14.

NG >> GO TO 13.

K

13. DETECT MALFUNCTIONING PART

Check the following.

L

G Harness connectors M58, F26

G Harness for open or short between ECM and accelerator pedal position sensor M

>> Repair open circuit or short to ground or short to power in harness or connectors.

14. CHECK APP SENSOR

Refer to EC-542, "Component Inspection" . OK or NG
OK >> GO TO 16. NG >> GO TO 15.

Revision: December 2006

EC-541

2006 Sentra

DTC P2138 APP SENSOR

15. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. 2. Perform EC-79, "Accelerator Pedal Released Position Learning" . 3. Perform EC-80, "Throttle Valve Closed Position Learning" . 4. Perform EC-80, "Idle Air Volume Learning" .

>> INSPECTION END
16. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
ACCELERATOR PEDAL POSITION SENSOR 1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Check voltage between ECM terminals 106 (APP sensor 1 signal), 98 (APP sensor 2 signal) and ground under the following conditions.

Terminal

Accelerator pedal

Voltage

106 (Accelerator pedal position sensor 1)

Fully released Fully depressed

0.65 - 0.87V More than 4.3V

98 (Accelerator pedal position sensor 2)

Fully released Fully depressed

0.28 - 0.48V More than 2.0V

4. If NG, replace accelerator pedal assembly and go to the next step.
5. Perform EC-79, "Accelerator Pedal Released Position Learning" . 6. Perform EC-80, "Throttle Valve Closed Position Learning" . 7. Perform EC-80, "Idle Air Volume Learning" .

Removal and Installation
ACCELERATOR PEDAL
Refer to ACC-2, "ACCELERATOR CONTROL SYSTEM" .

[QG18DE]
UBS00BGX MBIB0023E
UBS00BGY

Revision: December 2006

EC-542

2006 Sentra

DTC P2A00 A/F SENSOR 1
DTC P2A00 A/F SENSOR 1
Component Description
The A/F sensor 1 is a planar dual-cell limit current sensor. The sensor element of the A/F sensor 1 is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element. The sensor is capable of precise measurement = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide range (0.7 <
< air). The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygenpump cell so that the composition of the exhaust gas in the diffusion gap remains constant at = 1. Therefore, the A/F sensor 1 is able to indicate air-fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800°C (1,292 - 1,472°F).

[QG18DE]
PFP:22693
A
UBS00BDP
EC
C
D
SEF579Z
E
F
G

H

CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.

SEF580Z

UBS00BDQ

I

MONITOR ITEM

CONDITION

SPECIFICATION

A/F SEN1 (B1)

G Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5V

J

On Board Diagnosis Logic

UBS00 BD R

K

To judge the malfunction, the A/F signal computed by ECM from the air fuel ratio (A/F) sensor 1 signal is mon-

itored not to be shifted "lean" side or "rich" side. When the A/F signal is shifting to the lean side, the malfunc-

tion will be detected.

L

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

G The output voltage computed by ECM from the A/ G Air fuel ratio (A/F) sensor 1

M

P2A00 2A00

Air fuel ratio (A/F) sensor 1 range/ performance

F sensor 1 signal is shifted to the lean side for a specified period.
G The A/F signal computed by ECM from the A/F sensor 1 signal is shifted to the rich side for a

G Air fuel ratio (A/F) sensor heater 1 G Fuel pressure G Fuel injector

specified period.

G Intake air leaks

Revision: December 2006

EC-543

2006 Sentra

DTC P2A00 A/F SENSOR 1

[QG18DE]

Overall Function Check

UBS00BE1

Use this procedure to check the overall function of the A/F sensor 1 circuit. During this check, a 1st trip DTC might not be confirmed.

WITH CONSULT-II 1. Start engine and warm it up to normal operating temperature.
2. Select "DATA MONITOR" mode with CONSULT-II.
3. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in D position with "OD" OFF (A/T) or 3rd position (M/T).
NOTE: Keep accelerator pedal as steady as possible during the cruising.
4. Set D position with "OD" OFF (A/T) or 4th position (M/T), then release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30 MPH).
NOTE: Never apply brake during releasing the accelerator pedal.
5. Repeat steps 3 to 4 five times.
6. Stop the vehicle and turn ignition switch OFF.
7. Wait at least 10 seconds and restart engine.
8. Repeat steps 3 to 4 five times.
9. Make sure that no DTC is displayed. If the 1st trip DTC is displayed, go to EC-546, "Diagnostic Procedure" .

SEF189Y

WITH GST

1. Start engine and warm it up to normal operating temperature.
2. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in D position with "OD" OFF (A/T) or 3rd position (M/T). NOTE: Keep accelerator pedal as steady as possible during the cruising.
3. Set D position with "OD" OFF (A/T) or 4th position (M/T), then release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30 MPH).
NOTE: Never apply brake during releasing the accelerator pedal. 4. Repeat steps 2 to 3 five times.
5. Stop the vehicle and turn ignition switch OFF. 6. Wait at least 10 seconds and restart engine. 7. Repeat steps 2 to 3 five times.
8. Stop the vehicle and connect GST to the vehicle. 9. Make sure that no DTC is displayed.
If the 1st trip DTC is displayed, go to EC-546, "Diagnostic Procedure" .

Revision: December 2006

EC-544

2006 Sentra

Wiring Diagram

DTC P2A00 A/F SENSOR 1

[QG18DE]
UBS00 BD U
A EC
C D E F G H I J K L M

Revision: December 2006

EC-545

BBWA1454E
2006 Sentra

DTC P2A00 A/F SENSOR 1

[QG18DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

[Engine is running] G Warm-up condition G Idle speed

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

Approximately 3.1V Approximately 2.6V 2 - 3V 2 - 3V

PBIB1584E

UBS00BDV

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-151, "Ground Inspection" .

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1
Loosen and retighten the air fuel ratio (A/F) sensor 1. Tightening torque: 40 - 60 N-m (4.1 - 6.1 kg-m, 30 - 44 ft-lb)
>> GO TO 3.

Revision: December 2006

EC-546

BBIA0515E
2006 Sentra

DTC P2A00 A/F SENSOR 1
3. CHECK FOR INTAKE AIR LEAK
1. Start engine and run it at idle. 2. Listen for an intake air leak after the mass air flow sensor. OK or NG
OK >> GO TO 4. NG >> Repair or replace.
4. CLEAR THE SELF-LEARNING DATA.
With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT-II. 3. Clear the self-learning control coefficient by touching "CLEAR". 4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?

[QG18DE]
A EC
C D E F

G

Without CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF. 3. Disconnect mass air flow sensor harness connector, and restart
and run engine for at least 3 seconds at idle speed. 4. Stop engine and reconnect mass air flow sensor harness con-
nector. 5. Make sure DTC P0102 is displayed. 6. Erase the DTC memory. Refer to EC-63, "HOW TO ERASE
EMISSION-RELATED DIAGNOSTIC INFORMATION" . 7. Make sure DTC P0000 is displayed. 8. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine? Yes or No Yes >> Perform trouble diagnosis for DTC P0171 or P0172. Refer to EC-277 or EC-285 . No >> GO TO 5.
5. CHECK HARNESS CONNECTOR
1. Turn ignition switch OFF. 2. Disconnect A/F sensor 1 harness connector. 3. Check harness connector for water.
Water should not exit. OK or NG
OK >> GO TO 6. NG >> Repair or replace harness connector.

H
SEF215Z
I

J

K

L

BBIA0516E

M

Revision: December 2006

EC-547

2006 Sentra

DTC P2A00 A/F SENSOR 1
6. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect air fuel ratio (A/F) sensor 1 harness connector. 3. Turn ignition switch ON.

[QG18DE]

4. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 8. NG >> GO TO 7.
7. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M19, E108 G Harness connectors E10, F48 G Fuse block (J/B) connector M1 G 15A fuse G Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors.

BBIA0140E PBIB1683E

Revision: December 2006

EC-548

2006 Sentra

DTC P2A00 A/F SENSOR 1

[QG18DE]

8. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT A

1. Turn ignition switch OFF.

2. Check harness continuity between the following terminals. Refer to Wiring Diagram.

EC

A/F sensor 1 terminal

ECM terminal

1

16

2

75

C

5

35

6

56

D

Continuity should exist.

3. Check harness continuity between ECM terminals 16, 35, 56, 75 or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to Wiring Diagram.

E

Continuity should not exist.

4. Also check harness for short to power.

F

OK or NG

OK >> GO TO 9.

NG >> Repair open circuit or short to ground or short to power in harness or connectors.

G

9. CHECK A/F SENSOR 1 HEATER

H Refer to EC-165, "Component Inspection" .

OK or NG

OK >> GO TO 10.

I

NG >> GO TO 11.

10. CHECK INTERMITTENT INCIDENT J

Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

OK or NG

OK >> GO TO 11.

K

NG >> Repair or replace.

11. REPLACE AIR FUEL RATIO (A/F) SENSOR 1

L

Replace air fuel ratio (A/F) sensor 1.

CAUTION: G Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a

M

hard surface such as a concrete floor; use a new one.

G Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> INSPECTION END
Removal and Installation
AIR FUEL RATIO SENSOR 1 Refer to EM-15, "Removal and Installation" .

UBS00BDW

Revision: December 2006

EC-549

2006 Sentra

ASCD BRAKE SWITCH
ASCD BRAKE SWITCH Component Description
When the brake pedal is depressed, ASCD brake switch is turned OFF and stop lamp switch is turned ON. ECM detects the state of the brake pedal by this input of two kinds (ON/OFF signal) Refer to EC-32, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)" for the ASCD function.

[QG18DE]
PFP:25320
UBS00BHN

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

CONDITION

BRAKE SW1

G Ignition switch: ON

Clutch pedal (M/T) and brake pedal: Fully released Clutch pedal (M/T) and/or brake pedal: Depressed

BRAKE SW2

G Ignition switch: ON

Brake pedal: Fully released Brake pedal: Slightly Depressed

BBIA0087E UBS00BHO
SPECIFICATION ON OFF OFF ON

Revision: December 2006

EC-550

2006 Sentra

Wiring Diagram

ASCD BRAKE SWITCH

[QG18DE]
UBS00BHP
A EC
C D E F G H I J K L M

Revision: December 2006

EC-551

BBWA2146E
2006 Sentra

ASCD BRAKE SWITCH

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

101 R/G

Stop lamp switch

[Ignition switch: OFF] G Brake pedal: Fully released [Ignition switch: OFF] G Brake pedal: Slightly depressed

Approximately 0V
BATTERY VOLTAGE (11 - 14V)

108 P/L

ASCD brake switch

[Ignition switch: ON] G Brake pedal: Slightly depressed (A/T) G Clutch pedal and/or brake pedal: Slightly
depressed (M/T)

Approximately 0V

[Ignition switch: ON] G Brake pedal: Fully released (A/T) G Clutch pedal and brake pedal: Fully released (M/T)

BATTERY VOLTAGE (11 - 14V)

Revision: December 2006

EC-552

2006 Sentra

ASCD BRAKE SWITCH

Diagnostic Procedure
1. CHECK OVERALL FUNCTION-I

With CONSULT-II
1. Turn ignition switch ON.
2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT-II.
3. Check "BRAKE SW1" indication under the following conditions.
A/T models

CONDITION Brake pedal: Slightly depressed Brake pedal: Fully released

INDICATION OFF ON

M/T models

CONDITION Clutch pedal and/or brake pedal: Slightly depressed Clutch pedal and brake pedal: Fully released

INDICATION OFF ON

Without CONSULT-II
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 108 and ground under the following conditions.
A/T models

CONDITION Brake pedal: Slightly depressed Brake pedal: Fully released

VOLTAGE Approximately 0V
Battery voltage

M/T models

CONDITION
Clutch pedal and/or brake pedal: Slightly depressed
Clutch pedal and brake pedal: Fully released
OK or NG OK >> GO TO 2. NG (M/T models) >>GO TO 3. NG (A/T models) >>GO TO 4.

VOLTAGE Approximately 0V
Battery voltage

[QG18DE]
UBS00BHQ
A
EC
C
D
E
SEC011D
F
G
H
I
J
MBIB0061E
K
L
M

Revision: December 2006

EC-553

2006 Sentra

ASCD BRAKE SWITCH

2. CHECK OVERALL FUNCTION-II

With CONSULT-II Check "BRAKE SW2" indication in "DATA MONITOR" mode.

CONDITION Brake pedal: Slightly released Brake pedal: Fully depressed

INDICATION OFF ON

Without CONSULT-II Check voltage between ECM terminal 101 and ground under the following conditions.

CONDITION Brake pedal: Slightly released Brake pedal: Fully depressed

VOLTAGE Approximately 0V
Battery voltage

OK or NG OK >> INSPECTION END NG >> GO TO 13.
3. CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect ASCD clutch switch harness connector. 3. Turn ignition switch ON.

4. Check voltage between ASCD clutch switch terminal 1 and ground under the following conditions with CONSULT-II or tester.

CONDITION
Brake pedal: Fully released
Brake pedal: Slightly depressed
OK or NG OK >> GO TO 10. NG >> GO TO 4.

VOLTAGE Battery voltage
Approx. 0V

Revision: December 2006

EC-554

[QG18DE]
SEC013D MBIB0060E
BBIA0167E PBIB0799E
2006 Sentra

ASCD BRAKE SWITCH
4. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect ASCD brake switch harness connector. 3. Turn ignition switch ON.

[QG18DE]
A EC
C

D

4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK (M/T models)>>GO TO 6. OK (A/T models)>>GO TO 7. NG >> GO TO 5.

BBIA0087E
E
F
G
H

5. DETECT MALFUNCTIONING PART

PBIB0857E
I

Check the following.

G Fuse block (J/B) connector M1

J

G 10A fuse

G Harness for open or short between ASCD brake switch and fuse K

>> Repair open circuit or short to ground or short to power in harness or connectors.

6. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

L

1. Turn ignition switch OFF.

2. Check harness continuity between ASCD brake switch terminal 2 and ASCD clutch switch terminal 1.

M

Refer to Wiring Diagram.

Continuity should exist.

3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-555

2006 Sentra

ASCD BRAKE SWITCH
7. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 108 and ASCD brake switch terminal 2.
Refer to Wiring Diagram.
Continuity should exist. 4. Also check harness for short to ground or short to power. OK or NG
OK >> GO TO 9. NG >> GO TO 8.
8. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and ASCD brake switch

[QG18DE]

>> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK ASCD BRAKE SWITCH
Refer to EC-558, "Component Inspection" OK or NG
OK >> GO TO 18. NG >> Replace ASCD brake switch.
10. CHECK ASCD CLUTCH SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 108 and ASCD clutch switch terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 12. NG >> GO TO 11.
11. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and ASCD clutch switch

>> Repair open circuit or short to ground or short to power in harness or connectors.
12. CHECK ASCD CLUTCH SWITCH
Refer to EC-558, "Component Inspection" OK or NG
OK >> GO TO 18. NG >> Replace ASCD clutch switch.

Revision: December 2006

EC-556

2006 Sentra

ASCD BRAKE SWITCH
13. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect stop lamp switch harness connector.

[QG18DE]
A EC

C

3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT -II or tester.

D
BBIA0105E
E
F

G

H

Voltage: Battery voltage
OK or NG OK >> GO TO 15. NG >> GO TO 14.
14. DETECT MALFUNCTIONING PART

PBIB2284E
I J K

Check the following.

G Fuse block (J/B) connector M2

L

G 10A fuse

G Harness for open or short between stop lamp switch and battery

M

>> Repair open circuit or short to ground or short to power in harness or connectors.

15. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 17. NG >> GO TO 16.

Revision: December 2006

EC-557

2006 Sentra

ASCD BRAKE SWITCH
16. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and stop lamp switch

[QG18DE]

>> Repair open circuit or short to ground or short to power in harness or connectors.
17. CHECK STOP LAMP SWITCH
Refer to EC-558, "Component Inspection" . OK or NG
OK >> GO TO 18. NG >> Replace stop lamp switch.
18. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
ASCD BRAKE SWITCH 1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector. 3. Check harness continuity between ASCD brake switch terminals
1 and 2 under the following conditions.

Condition Brake pedal: Fully released. Brake pedal: Slightly depressed.

Continuity Should exist. Should not exist.

If NG, adjust ASCD brake switch installation, refer to BR-11, "BRAKE PEDAL AND BRACKET" , and perform step 3 again.

UBS00BHR

ASCD CLUTCH SWITCH (M/T MODELS) 1. Turn ignition switch OFF. 2. Disconnect ASCD clutch switch harness connector.
3. Check continuity between ASCD clutch switch terminals 1 and 2 under the following conditions.

Condition Clutch pedal: Fully released. Clutch pedal: Slightly depressed.

Continuity Should exist. Should not exist.

If NG, adjust ASCD clutch switch installation, refer to CL-6, "CLUTCH SYSTEM" , and perform step 3 again.

SEC023D

SEC024D

Revision: December 2006

EC-558

2006 Sentra

ASCD BRAKE SWITCH

[QG18DE]

STOP LAMP SWITCH

1. Turn ignition switch OFF.

A

2. Disconnect stop lamp switch harness connector.

3. Check harness continuity between stop lamp switch terminals 1 and 2 under the following conditions. EC

C

D

E
PBIB2285E

Condition

Continuity

Brake pedal: Fully released.

Should not exist.

F

Brake pedal: Slightly depressed.

Should exist.

If NG, adjust stop lamp switch installation, refer to BR-11, "BRAKE PEDAL AND BRACKET" , and perform G step 3 again.

H

I

J

K

L

M

Revision: December 2006

EC-559

2006 Sentra

ASCD INDICATOR

[QG18DE]

ASCD INDICATOR

PFP:24814

Component Description

UBS00BHS

ASCD indicator lamp illuminates to indicate ASCD operation status. Lamp has two indicators, CRUISE and SET, and is integrated in combination meter. CRUISE indicator illuminates when MAIN switch on ASCD steering switch is turned ON to indicate that ASCD system is ready for operation. SET indicator illuminates when following conditions are met.
G CRUISE indicator is illuminated.
G SET/COAST switch on ASCD steering switch is turned ON while vehicle speed is within the range of ASCD setting.
SET indicator remains lit during ASCD control. Refer to EC-32, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)" for the ASCD function.

CONSULT-II Reference Value in Data Monitor Mode

UBS00BHT

Specification data are reference value.

MONITOR ITEM

CONDITION

SPECIFICATION

CRUISE LAMP

G Ignition switch: ON

MAIN switch: Pressed at the 1st time  at the 2nd time

ON  OFF

SET LAMP

G MAIN switch: ON
G When vehicle speed is between 40 km/h (25 MPH) and 144 km/h (89 MPH)

ASCD: Operating ASCD: Not operating

ON OFF

Revision: December 2006

EC-560

2006 Sentra

Wiring Diagram

ASCD INDICATOR

[QG18DE]
UBS00 BH U
A EC
C D E F G H I J K L M

Revision: December 2006

EC-561

BBWA2149E
2006 Sentra

Diagnostic Procedure
1. CHECK OVERALL FUNCTION

ASCD INDICATOR

[QG18DE]
UBS00BHV

Check ASCD indicator under the following conditions.

ASCD INDICATOR

CONDITION

SPECIFICATION

CRUISE LAMP

G Ignition switch: ON

MAIN switch: At the 1st time  at the 2nd time

ON  OFF

SET LAMP

G MAIN switch: ON
G When vehicle speed is between 40 km/h (25 MPH) and 144 km/h (89 MPH)

ASCD: Operating ASCD: Not operating

ON OFF

OK or NG
OK >> INSPECTION END NG >> GO TO 2.

2. CHECK DTC

Check that DTC U1000 or U1001 is not displayed. Yes or No
Yes >> Perform trouble diagnoses for DTC U1000, U1001, refer to EC-152, "DTC U1000, U1001 CAN COMMUNICATION LINE" .
No >> GO TO 3.
3. CHECK COMBINATION METER OPERATION

Does combination meter operate normally? Yes or No
Yes >> GO TO 4. No >> Check combination meter circuit. Refer to DI-7, "Combination Meter" .
4. CHECK INTERMITTENT INCIDENT

Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-562

2006 Sentra

ELECTRICAL LOAD SIGNAL

ELECTRICAL LOAD SIGNAL

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

CONDITION

LOAD SIGNAL

G Ignition switch: ON

Rear window defogger switch and/ or lighting switch is in 2nd
Rear window defogger switch is OFF and lighting switch is OFF

HEATER FAN SW

G Engine: After warming up, idle the engine

Heater fan: Operating Heater fan: Not operating

[QG18DE]
PFP:25350
A
UBS00BJC

SPECIFICATION

EC

ON
C
OFF

ON
D
OFF

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-563

2006 Sentra

Wiring Diagram

ELECTRICAL LOAD SIGNAL

[QG18DE]
UBS00BJD

Revision: December 2006

EC-564

BBWA2147E
2006 Sentra

ELECTRICAL LOAD SIGNAL

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

84 PU

Electrical load signal (Headlamp signal)

[Ignition switch: ON] G Lighting switch: 2ND position [Ignition switch: ON] G Lighting switch: OFF

BATTERY VOLTAGE

C

(11 - 14V)

Approximately 0V

D

96 Y/G

Electrical load signal (Heater fan signal)

[Engine is running] G Heater fan switch: ON [Engine is running] G Heater fan switch: OFF

Approximately 0V
E
Approximately 5V

F

G

H

I

J

K

L

M

Revision: December 2006

EC-565

2006 Sentra

ELECTRICAL LOAD SIGNAL

[QG18DE]

Revision: December 2006

EC-566

BBWA2148E
2006 Sentra

ELECTRICAL LOAD SIGNAL

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

[Ignition switch: ON]

BATTERY VOLTAGE

C

Electrical load signal

G Rear window defogger switch: ON

(11 - 14V)

93 L/W

(Rear window defogger

signal)

[Ignition switch: ON]

G Rear window defogger switch: OFF

Approximately 0V

D

Diagnostic Procedure
1. INSPECTION START

UBS00BJE
E

Do you have CONSULT-II?

Yes or No

F

Yes >> GO TO 2.

No >> GO TO 3.

2. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-I

G

With CONSULT-II
1. Turn ignition switch ON. 2. Check "LOAD SIGNAL" in "DATA MONITOR" mode with CON-
SULT-II under the following conditions.

Condition
Lighting switch ON at 2nd position
Lighting switch OFF
OK or NG OK >> GO TO 4. NG >> GO TO 8.

LOAD SIGNAL ON OFF

3. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-I

H
I
J
K
PBIB0103E
L

Without CONSULT-II 1. Turn ignition switch ON.
2. Check voltage between ECM terminal 84 and ground under the following conditions.

Condition
Lighting switch ON at 2nd position
Lighting switch OFF
OK or NG OK >> GO TO 5. NG >> GO TO 8.

Voltage BATTERY VOLTAGE 0V

M
PBIB0674E

Revision: December 2006

EC-567

2006 Sentra

ELECTRICAL LOAD SIGNAL

4. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II

With CONSULT-II 1. Turn ignition switch ON.
2. Check "HEATER FAN SW" in "DATA MONITOR" mode with CONSULT-II under the following conditions.

Condition
FAN control switch ON in any position
FAN control switch OFF
OK or NG OK >> GO TO 6. NG >> GO TO 13.

INDICATION ON OFF

5. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II

Without CONSULT-II 1. Turn ignition switch ON. 2. Check voltage between ECM terminal 96 and ground under the
following conditions.

Condition
FAN control switch ON in any position
FAN control switch OFF
OK or NG OK >> GO TO 7. NG >> GO TO 13.

Voltage Approximately 0V Approximately 5V

6. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-III

With CONSULT-II 1. Turn ignition switch ON. 2. Check "LOAD SIGNAL" in "DATA MONITOR" mode with CON-
SULT-II under the following conditions.

Condition
Rear window defogger switch ON
Rear window defogger switch OFF
OK or NG OK >> INSPECTION END NG >> GO TO 16.

LOAD SIGNAL ON OFF

[QG18DE]
PBIB1995E PBIB1219E PBIB0103E

Revision: December 2006

EC-568

2006 Sentra

ELECTRICAL LOAD SIGNAL
7. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-III
Without CONSULT-II 1. Turn ignition switch ON. 2. Check voltage between ECM terminal 93 and ground under the
following conditions.

[QG18DE]
A EC

Condition

Voltage

C

Rear window defogger switch ON

BATTERY VOLTAGE

Rear window defogger switch OFF
OK or NG OK >> INSPECTION END NG >> GO TO 16.

Approximately 0V

D
E
PBIB1788E

8. CHECK HEADLAMP FUNCTION
F 1. Start engine.
2. Turn the lighting switch ON at 2nd position.

3. Check that headlamps are illuminated.

G

OK or NG

OK (Models for USA)>>GO TO 9.

OK (Models for Canada)>>GO TO 11.

H

NG >> Refer to LT-6, "HEADLAMP (FOR USA)" or LT-10, "HEADLAMP (FOR CANADA) -- DAYTIME

LIGHT SYSTEM --" .

9. CHECK HEADLAMP INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

I

1. Stop engine.

2. Disconnect ECM harness connector.

J

3. Disconnect lighting switch harness connector.

4. Check harness continuity between ECM terminal 84 and lighting

switch terminal 12.

K

Continuity should exist.

5. Also check harness for short to ground and short to power.

L

OK or NG

OK >> GO TO 19.

NG >> GO TO 10.

M

10. DETECT MALFUNCTIONING PART
Check the following. G Fuse block (J/B) G Harness connectors M59, F27 G Harness for open and short between ECM and lighting switch
>> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB2583E

Revision: December 2006

EC-569

2006 Sentra

ELECTRICAL LOAD SIGNAL
11. CHECK HEADLAMP INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

[QG18DE]

1. Stop engine.
2. Disconnect ECM harness connector.
3. Disconnect lighting switch harness connector E115. Disconnect daytime light control unit harness connector.
4. Check harness continuity between ECM terminal 84 and lighting switch terminal 12, daytime light control unit terminal 6 under the following conditions.

Condition

Continuity

1

Should exist

2

Should not exist

5. Also check harness for short to ground and short to power.
OK or NG OK >> GO TO 19. NG >> GO TO 12.

12. DETECT MALFUNCTIONING PART

Check the following. G Harness connectors E109, M20 G Harness connectors M59, F27 G Daytime light control unit G Fuse block (J/B) G Diode-3 G Harness for open and short between ECM and lighting switch G Harness for open and short between ECM and daytime light control unit

>> Repair open circuit or short to ground or short to power in harness or connectors.
13. CHECK HEATER FAN SWITCH FUNCTION
1. Start engine. 2. Turn the heater fan switch ON in any position. 3. Check that heater fan turns properly. OK or NG
OK >> GO TO 14. NG >> Refer to MTC-19, "TROUBLE DIAGNOSIS"

PBIB1789E

Revision: December 2006

EC-570

2006 Sentra

ELECTRICAL LOAD SIGNAL
14. CHECK HEATER FAN INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Stop engine. 2. Disconnect ECM harness connector. 3. Disconnect fan control switch harness connector. 4. Check harness continuity between ECM terminal 96 and fan control switch terminal 6.
Continuity should exist. 5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 19. NG >> GO TO 15.
15. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open and short between ECM and fan control switch

[QG18DE]
A EC
C D E F

>> Repair open circuit or short to ground or short to power in harness or connectors.

G

16. CHECK REAR WINDOW DEFOGGER FUNCTION

1. Start engine.

H

2. Turn ON the rear window defogger switch.

3. Check the rear windshield. Is the rear windshield heated up? I
Yes or No

Yes >> GO TO 17.

No >> Refer to GW-17, "REAR WINDOW DEFOGGER"

J

17. CHECK REAR WINDOW DEFOGGER INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Stop engine.

K

2. Disconnect ECM harness connector.

3. Disconnect rear window defogger relay.

4. Check harness continuity between ECM terminal 93 and rear window defogger relay terminals 5, 7.

L

Continuity should exist.

5. Also check harness for short to ground and short to power.

M

OK or NG

OK >> GO TO 19. NG >> GO TO 18.

18. DETECT MALFUNCTIONING PART

Check the following. G Harness connectors B1, M14 G Harness connectors M58, F26 G Harness for open and short between ECM and rear window defogger relay.

>> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-571

2006 Sentra

ELECTRICAL LOAD SIGNAL
19. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . >> INSPECTION END

[QG18DE]

Revision: December 2006

EC-572

2006 Sentra

FUEL INJECTOR
FUEL INJECTOR
Component Description
The fuel injector is a small, precise solenoid valve. When the ECM supplies a ground to the fuel injector circuit, the coil in the fuel injector is energized. The energized coil pulls the needle valve back and allows fuel to flow through the fuel injector into the intake manifold. The amount of fuel injected depends upon the injection pulse duration. Pulse duration is the length of time the fuel injector remains open. The ECM controls the injection pulse duration based on engine fuel needs.

[QG18DE]
PFP:16600
A
UBS00BH4
EC
C
D

CONSULT-II Reference Value in Data Monitor Mode

MONITOR ITEM INJ PULSE-B1 B/FUEL SCHDL

CONDITION

G Engine: After warming up G Air conditioner switch: OFF G Shift lever: N (A/T), Neutral (M/T) G No load

Idle 2,000 rpm

See EC-134, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .

SEF375Z
E
UBS00BH5

SPECIFICATION

2.4 - 3.2 msec

F

1.9 - 3.2 msec
G

H

I

J

K

L

M

Revision: December 2006

EC-573

2006 Sentra

Wiring Diagram

FUEL INJECTOR

[QG18DE]
UBS00BH6

Revision: December 2006

EC-574

BBWA2144E
2006 Sentra

FUEL INJECTOR

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)
C
BATTERY VOLTAGE

[Engine is running]

(11 - 14V)

G Warm-up condition

D

G Idle speed

22 G/B 23 R/B 41 L/B 42 Y/B

Fuel injector No. 3 Fuel injector No. 1 Fuel injector No. 4 Fuel injector No. 2

NOTE:

The pulse cycle changes depending on

E

rpm at idle.

PBIB0529E

BATTERY VOLTAGE

F

(11 - 14V)

[Engine is running]

G Warm-up condition

G

G Engine speed: 2,000 rpm

H
PBIB0530E

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
1. INSPECTION START
Turn ignition switch to START. Is any cylinder ignited? Yes or No
Yes >> GO TO 2. No >> GO TO 3.

I
UBS00BH7
J
K
L

M

Revision: December 2006

EC-575

2006 Sentra

FUEL INJECTOR
2. CHECK OVERALL FUNCTION
With CONSULT-II 1. Start engine. 2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with
CONSULT-II. 3. Make sure that each circuit produces a momentary engine
speed drop.
Without CONSULT-II 1. Start engine. 2. Listen to each fuel injector operating sound.
Clicking noise should be heard.
OK or NG OK >> INSPECTION END NG >> GO TO 3.

[QG18DE]
PBIB0133E PBIB1986E

Revision: December 2006

EC-576

2006 Sentra

FUEL INJECTOR
3. CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
1. Stop engine. 2. Disconnect fuel injector harness connector. 3. Turn ignition switch ON.

[QG18DE]
A EC
C

D

4. Check voltage between fuel injector terminal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 5. NG >> GO TO 4.

BBIA0176E
E
F
G

H

4. DETECT MALFUNCTIONING PART

PBIB0582E
I

Check the following.

G Harness connectors M19, E108

J

G Harness connectors E10, F48

G Harness connectors F12, F101

G Fuse block (J/B) connector M1

K

G 10A fuse

G Harness for open or short between fuel injector and fuse L

>> Repair harness or connectors.

5. CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

M

1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between fuel injector harness connector terminal 2 and ECM terminals 22, 23,
41, 42. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 7. NG >> GO TO 6.

Revision: December 2006

EC-577

2006 Sentra

FUEL INJECTOR
6. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors F12, F101 G Harness for open or short between fuel injector and ECM

[QG18DE]

>> Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK FUEL INJECTOR
Refer to EC-578, "Component Inspection" . OK or NG
OK >> GO TO 8. NG >> Replace fuel injector.
8. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
FUEL INJECTOR 1. Disconnect fuel injector harness connector. 2. Check resistance between terminals as shown in the figure.
Resistance: 12.5 - 18.4 [at 10 - 60°C (50 - 140°F)]

UBS00BH8

Removal and Installation
FUEL INJECTOR
Refer to EM-21, "Removal and Installation" .

PBIB1727E UBS00BH9

Revision: December 2006

EC-578

2006 Sentra

FUEL PUMP

[QG18DE]

FUEL PUMP
System Description
SYSTEM DESCRIPTION

PFP:17042
A
UBS00BHA

Sensor

Input Signal to ECM

ECM function

Actuator

EC

Crankshaft position sensor (POS) Camshaft position sensor (PHASE)
Battery

Engine speed* Battery voltage*

Fuel pump control

Fuel pump relay

C

*: ECM determines the start signal status by the signals of engine speed and battery voltage.
The ECM activates the fuel pump for 1 second after the ignition switch is turned ON to improve engine start- D ability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging, E thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay, which in turn controls the fuel pump.

Condition Ignition switch is turned to ON.

Fuel pump operation

F

Operates for 1 second

Engine running and cranking When engine is stopped

Operates

Stops in 1 second

G

Except as shown above

Stops

COMPONENT DESCRIPTION

H

A turbine type design fuel pump is used in the fuel tank.

I

J

CONSULT-II Reference Value in Data Monitor Mode

MONITOR ITEM FUEL PUMP RLY

CONDITION G Ignition switch is turned to ON (Operates for 1 second) G Engine running and cranking G When engine is stopped (Stops in 1 second) G Except as shown above

K
PBIB1218E

UBS00BHB

L

SPECIFICATION

ON

M

OFF

Revision: December 2006

EC-579

2006 Sentra

Wiring Diagram

FUEL PUMP

[QG18DE]
UBS00BHC

Revision: December 2006

EC-580

BBWA1451E
2006 Sentra

FUEL PUMP

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

113 B/P

Fuel pump relay

Diagnostic Procedure
1. CHECK OVERALL FUNCTION

[Ignition switch: ON] G For 1 second after turning ignition switch
ON. [Engine is running]
[Ignition switch: ON] G More than 1 second after turning ignition
switch ON.

1. Turn ignition switch ON.
2. Pinch fuel feed hose with fingers. Fuel pressure pulsation should be felt on the fuel feed hose for 1 seconds after ignition switch is turned ON.
OK or NG
OK >> INSPECTION END NG >> GO TO 2.

0 - 1.0V
BATTERY VOLTAGE (11 - 14V)

C D E
UBS00 BH D
F G H

I

2. CHECK FUEL PUMP POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect fuel pump relay. 3. Turn ignition switch ON.

BBIA0163E
J
K
L

M

4. Check voltage between fuel pump relay terminals 1, 5 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 4. NG >> GO TO 3.

Revision: December 2006

EC-581

BBIA0307E
PBIB0303E
2006 Sentra

FUEL PUMP
3. DETECT MALFUNCTIONING PART
Check the following. G 10A fuse G 15A fuse G Fuse block (J/B) connector B4 G Harness for open or short between fuse and fuel pump relay

[QG18DE]

>> Repair harness or connectors.
4. CHECK FUEL PUMP POWER CIRCUIT AND GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF. 2. Disconnect "fuel level sensor unit and fuel pump" harness con-
nector. 3. Check harness continuity between "fuel level sensor unit and
fuel pump" terminal 3 and ground, "fuel level sensor unit and fuel pump" terminal 1 and fuel pump relay terminal 3. Refer to wiring diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 6. NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART

BBIA0132E

Check the following. G Harness for open or short between and "fuel level sensor unit and fuel pump" and ground G Harness for open or short between and "fuel level sensor unit and fuel pump" and fuel pump relay

>> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK FUEL PUMP RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 113 and fuel pump relay terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 8. NG >> GO TO 7.
7. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors B3, M16 G Harness connector M58, F26 G Harness for open or short between ECM and fuel pump relay

>> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-582

2006 Sentra

FUEL PUMP

8. CHECK FUEL PUMP RELAY
Refer to EC-583, "Component Inspection" . OK or NG
OK >> GO TO 9. NG >> Replace fuel pump relay.
9. CHECK FUEL PUMP
Refer to EC-583, "Component Inspection" . OK or NG
OK >> GO TO 10. NG >> Replace "fuel level sensor unit and fuel pump".
10. CHECK INTERMITTENT INCIDENT
Perform EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
FUEL PUMP RELAY Check continuity between terminals 3 and 5.

Condition 12V direct current supply between terminals 1 and 2 No current supply
If NG, replace relay.

Continuity Yes No

FUEL PUMP 1. Disconnect "fuel level sensor unit and fuel pump" harness con-
nector. 2. Check resistance between "fuel level sensor unit and fuel pump"
terminals 1 and 3.
Resistance: 0.2 - 5.0 [at 25°C (77°F)]
If NG, replace "fuel level sensor unit and fuel pump".

Removal and Installation
FUEL PUMP
Refer toDI-26, "FUEL LEVEL SENSOR UNIT CHECK" .

[QG18DE]
A

EC

C

D

E

F

UBS00BHE

G

H

I

J
SEF145X
K

L

M

PBIB0928E UBS00BHF

Revision: December 2006

EC-583

2006 Sentra

IGNITION SIGNAL
IGNITION SIGNAL Component Description
IGNITION COIL & POWER TRANSISTOR The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil secondary circuit.

[QG18DE]
PFP:22448
UBS0 0 BG Z
BBIA0172E

Revision: December 2006

EC-584

2006 Sentra

Wiring Diagram

IGNITION SIGNAL

[QG18DE]
UBS00BH0
A EC
C D E F G H I J K L M

Revision: December 2006

EC-585

BBWA2029E
2006 Sentra

IGNITION SIGNAL

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

111 W/G

ECM relay (Self shut-off)

[Engine is running] [Ignition switch: OFF]
G For a few seconds after turning ignition switch OFF

0 - 1.0V

[Ignition switch: OFF]
G More than a few seconds after turning ignition switch OFF

BATTERY VOLTAGE (11 - 14V)

119 R/G 120 R/G

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE (11 - 14V)

Revision: December 2006

EC-586

2006 Sentra

IGNITION SIGNAL

[QG18DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-587

BBWA2142E
2006 Sentra

IGNITION SIGNAL

[QG18DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

62 BR 81 PU

Ignition signal No. 1 Ignition signal No. 2

[Engine is running]
G Warm-up condition
G Idle speed
NOTE: The pulse cycle changes depending on rpm at idle.

0 - 0.1V

0 - 0.2V

PBIB0521E

[Engine is running] G Warm-up condition G Engine speed: 2,000 rpm.

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

PBIB0522E

Revision: December 2006

EC-588

2006 Sentra

IGNITION SIGNAL

[QG18DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-589

BBWA2143E
2006 Sentra

IGNITION SIGNAL

[QG18DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

61 L/W

Ignition signal No. 3

80 GY/R Ignition signal No. 4

[Engine is running]
G Warm-up condition
G Idle speed
NOTE: The pulse cycle changes depending on rpm at idle.

0 - 0.1V

0 - 0.2V

PBIB0521E

[Engine is running] G Warm-up condition G Engine speed: 2,000 rpm.

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
1. CHECK ENGINE START
Turn ignition switch OFF, and restart engine. Is engine running? Yes or No
Yes (With CONSULT-II) >>GO TO 2. Yes (Without CONSULT-II) >>GO TO 3. No >> GO TO 4.
2. CHECK OVERALL FUNCTION
With CONSULT-II 1. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-II. 2. Make sure that each circuit produces a momentary engine
speed drop. OK or NG
OK >> INSPECTION END NG >> GO TO 10.

PBIB0522E UBS00BH1

PBIB0133E

Revision: December 2006

EC-590

2006 Sentra

IGNITION SIGNAL
3. CHECK OVERALL FUNCTION
Without CONSULT-II 1. Let engine idle. 2. Read the voltage signal between ECM terminals 61, 62, 80, 81
and ground with an oscilloscope. 3. Verify that the oscilloscope screen shows the signal wave as
shown below. NOTE: The pulse cycle changes depending on rpm at idle.

OK or NG
OK >> INSPECTION END NG >> GO TO 10.

PBIB0521E

4. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I

1. Turn ignition switch ON. 2. Check voltage between ECM terminals 119, 120 and ground
with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 5. NG >> Go to EC-145, "POWER SUPPLY AND GROUND CIRCUIT" .

5. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF. 2. Disconnect condenser harness connector. 3. Turn ignition switch ON. 4. Check voltage between condenser terminal 1 and ground with
CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 10. NG >> GO TO 6.

Revision: December 2006

EC-591

[QG18DE]
A EC
C D E
PBIB1204E
F G H I J K
MBIB0034E
L M
PBIB0624E
2006 Sentra

IGNITION SIGNAL
6. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF. 2. Disconnect ECM relay. 3. Check harness continuity between ECM relay terminal 7 and
condenser terminal 1. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 7. NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
7. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV
Check voltage between ECM relay terminal 6 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 9. NG >> GO TO 8.

8. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E10, F48 G 15A fuse G Harness for open or short between ECM relay and battery

>> Repair or replace harness or connectors.
9. CHECK ECM RELAY

Refer to EC-594, "Component Inspection" . OK or NG
OK >> GO TO 17. NG >> Replace ECM relay.
10. CHECK CONDENSER GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.
2. Disconnect condenser harness connector. 3. Check harness continuity between condenser terminal 2 and ground.
Refer to Wiring diagram.

Continuity should exist.

4. Also check harness for short to power.
OK or NG OK >> GO TO 11. NG >> Repair open circuit or short to power in harness or connector.

Revision: December 2006

EC-592

[QG18DE]
LEC444 PBIB0625E
2006 Sentra

IGNITION SIGNAL
11. CHECK CONDENSER
Refer to EC-594, "Component Inspection" . OK or NG
OK >> GO TO 12. NG >> Replace condenser.
12. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-V
1. Turn ignition switch OFF. 2. Reconnect all harness connectors disconnected. 3. Disconnect ignition coil harness connector. 4. Turn ignition switch ON.

[QG18DE]
A EC
C D E

F

5. Check voltage between ignition coil terminal 3 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 14. NG >> GO TO 13.
13. DETECT MALFUNCTIONING PART
Check the following. G Harness for open or short between ignition coil and ECM relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
14. CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Check harness continuity between ignition coil terminal 2 and ground.
Refer to Wiring Diagram. Continuity should exist.
3. Also check harness for short to power. OK or NG
OK >> GO TO 15. NG >> Repair open circuit or short to power in harness or connectors.

G
BBIA0172E
H

I

J

PBIB0138E

K

L

M

Revision: December 2006

EC-593

2006 Sentra

IGNITION SIGNAL
15. CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

[QG18DE]

1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminals 61, 62, 80, 81 and ignition coil terminal 1.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 16. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
16. CHECK IGNITION COIL WITH POWER TRANSISTOR

Refer to EC-594, "Component Inspection" . OK or NG
OK >> GO TO 17. NG >> Replace ignition coil with power transistor.
17. CHECK INTERMITTENT INCIDENT

Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
ECM RELAY 1. Apply 12V direct current between ECM relay terminals 1 and 2. 2. Check continuity between relay terminals 3 and 5, 6 and 7.

Condition 12V direct current supply between terminals 1 and 2 OFF
3. If NG, replace ECM relay.

Continuity Yes No

UBS00BH2

IGNITION COIL WITH POWER TRANSISTOR CAUTION: Do the following procedure in the place where ventilation is good without the combustible. 1. Turn ignition switch OFF. 2. Disconnect ignition coil harness connector. 3. Check resistance between ignition coil terminals as follows.

Terminal No. (Polarity)

Resistance  [at 25°C (77°F)]

1 and 2

Except 0 or 

1 and 3 2 and 3

Except 0

4. If NG, replace ignition coil with power transistor. If OK, go to next step.
5. Turn ignition switch OFF. 6. Reconnect all harness connectors disconnected.

PBIB0077E PBIB0847E

Revision: December 2006

EC-594

2006 Sentra

IGNITION SIGNAL

[QG18DE]

7. Remove fuel pump fuse in fuse and fusible link box to release fuel pressure.
NOTE: Do not use CONSULT-II to release fuel pressure, or fuel pressure applies again during the following procedure.
8. Start engine.
9. After engine stalls, crank it two or three times to release all fuel pressure.
10. Turn ignition switch OFF.
11. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
12. Remove ignition coil and spark plug of the cylinder to be checked.
13. Crank engine for five seconds or more to remove combustion gas in the cylinder.
14. Connect spark plug and harness connector to ignition coil.
15. Fix ignition coil using a rope etc. with gap of 13 - 17 mm between the edge of the spark plug and grounded metal portion as shown in the figure.
16. Crank engine for about three seconds, and check whether spark is generated between the spark plug and the grounded metal portion.
Spark should be generated.

A EC
C
LEC298
D E F G

CAUTION: G Do not approach to the spark plug and the ignition coil
within 50cm. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20kV or more.

H
PBIB2325E
I

G It might cause to damage the ignition coil if the gap of more than 17 mm is taken.

NOTE: When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning. J

17. If NG, replace ignition coil with power transistor.

CONDENSER

1. Turn ignition switch OFF.

K

2. Disconnect condenser harness connector.

3. Check resistance between condenser terminals 1 and 2.

L

Resistance: Above 1 M at 25°C (77°F)

M

Removal and Installation
IGNITION COIL WITH POWER TRANSISTOR
Refer to EM-15, "Removal and Installation" .

MBIB0031E UBS00BH3

Revision: December 2006

EC-595

2006 Sentra

REFRIGERANT PRESSURE SENSOR
REFRIGERANT PRESSURE SENSOR Description
The refrigerant pressure sensor is installed at the condenser of the air conditioner system. The sensor uses an electrostatic volume pressure transducer to convert refrigerant pressure to voltage. The voltage signal is sent to ECM, and ECM controls cooling fan system.

[QG18DE]
PFP:92136
UBS00BHG

BBIA0165E

PBIB2657E

Revision: December 2006

EC-596

2006 Sentra

Wiring Diagram

REFRIGERANT PRESSURE SENSOR

[QG18DE]
UBS00 BH H
A EC
C D E F G H I J K L M

Revision: December 2006

EC-597

BBWA2145E
2006 Sentra

REFRIGERANT PRESSURE SENSOR

[QG18DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

49 R/Y

Sensor power supply (Refrigerant pressure sensor)

[Ignition switch: ON]

Approximately 5V

67 B/W 70 L

Sensor ground Refrigerant pressure sensor

[Engine is running] G Warm-up condition G Idle speed
[Engine is running] G Warm-up condition G Both A/C switch and blower switch: ON
(Compressor operates.)

Approximately 0V 1.0 - 4.0V

Diagnostic Procedure
1. CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION

UBS00BHI

1. Start engine and warm it up to normal operating temperature. 2. Turn A/C switch and blower switch ON. 3. Check voltage between ECM terminal 70 and ground with CON-
SULT-II or tester.
Voltage: 1.0 - 4.0V
OK or NG OK >> INSPECTION END NG >> GO TO 2.

PBIB1205E

Revision: December 2006

EC-598

2006 Sentra

REFRIGERANT PRESSURE SENSOR
2. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Turn A/C switch and blower switch OFF. 2. Stop engine. 3. Disconnect refrigerant pressure sensor harness connector. 4. Turn ignition switch ON.

[QG18DE]
A EC
C

D

5. Check voltage between refrigerant pressure sensor terminal 3 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 4. NG >> GO TO 3.

E
BBIA0165E
F G H

3. DETECT MALFUNCTIONING PART

SEF479Y

I

Check the following.

J

G Harness connectors E9, F47

G Harness for open or short between ECM and refrigerant pressure sensor

K

>> Repair harness or connectors.

4. CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

L

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

M

3. Disconnect TCM harness connector.

4. Check harness continuity between refrigerant pressure sensor terminal 1 and ECM terminal 67, TCM terminal 42. Refer to Wiring Diagram.

Continuity should exist.
5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 6. NG >> GO TO 5.

Revision: December 2006

EC-599

2006 Sentra

REFRIGERANT PRESSURE SENSOR
5. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E10, F48 G Harness for open or short between TCM and refrigerant pressure sensor G Harness for open or short between ECM and refrigerant pressure sensor

[QG18DE]

>> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 70 and refrigerant pressure sensor terminal 2. Refer to Wiring Diagram.
Continuity should exist. 2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 8. NG >> GO TO 7.
7. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E10, F48 G Harness for open or short between ECM and refrigerant pressure sensor

>> Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK REFRIGERANT PRESSURE SENSOR
Refer to MTC-15, "Refrigerant Pressure Sensor" . OK or NG
OK >> GO TO 9. NG >> Replace refrigerant pressure sensor.
9. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Removal and Installation
REFRIGERANT PRESSURE SENSOR Refer to MTC-15, "REFRIGERATION SYSTEM" .

UBS00BHJ

Revision: December 2006

EC-600

2006 Sentra

MIL & DATA LINK CONNECTORS
MIL & DATA LINK CONNECTORS Wiring Diagram

[QG18DE]
PFP:24814
A
UBS00BHW
EC C D E
F G H I J K L M

Revision: December 2006

EC-601

BBWA2157E
2006 Sentra

MIL & DATA LINK CONNECTORS

[QG18DE]

Revision: December 2006

EC-602

BBWA2263E
2006 Sentra

SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS) Fuel Pressure

[QG18DE]
PFP:00030
A
UBS00BI8

Fuel pressure at idling kPa (kg/cm2 , psi)
Idle Speed and Ignition Timing

Approximately 350 (3.57, 51)

EC
UBS00BI9

Target idle speed

A/T

(Engine is warmed up to normal operating temperature) M/T

No-load* (in P or N position) No-load* (in Neutral position)

800 ± 50 rpm
C
650 ± 50 rpm

A/T Air conditioner: ON
M/T
A/T Ignition timing
M/T
*: Under the following conditions:
G Air conditioner switch: OFF
G Electrical load: OFF (Lights, heater fan & rear window defogger)
G Steering wheel: Kept in straight-ahead position

In P or N position In Neutral position In P or N position In Neutral position

850 rpm or more
D
18 ± 5° BTDC 7 ± 5° BTDC
E
F

Mass Air Flow Sensor
Supply voltage V

Battery voltage (11 - 14)

UBS00BIA
G

Output voltage at idle V

0.9 - 1.2

Mass air flow (Using CONSULT-II or GST) g·m/sec

1.4 - 4.0 at idle*

H

5.0 - 10.0 at 2,500 rpm*

*: Engine is warmed up to normal operating temperature and idling under no-load.

Engine Coolant Temperature Sensor

I
UBS00BIB

Temperature °C (°F) 20 (68) 50 (122) 90 (194)
Fuel Pump

Resistance k 2.1 - 2.9
0.68 - 1.00 0.236 - 0.260

J
K
UBS00BIC

Resistance [at 25°C (77°F)] 
Fuel Injector

0.2 - 5.0

L
UBS00BID

Resistance [at 10 - 60°C (50 - 140°F)] 
Throttle Control Motor

12.5 - 18.4

M
UBS00BIF

Resistance [at 25°C (77°F)]
Air Fuel Ratio (A/F) Sensor 1 Heater

Approximately 1 - 15

UBS00BIG

Resistance [at 25°C (77°F)] 

2.3 - 4.3

Heated Oxygen Sensor 2 Heater

UBS00BIN

Resistance [at 25°C (77°F)] 

8 - 10

Calculated Load Value

UBS00BIH

Condition
At idle At 2,500 rpm

Calculated load value % (Using CONSULT-II or GST)
20.0 - 35.5
12.0 - 30.0

Revision: December 2006

EC-603

2006 Sentra

SERVICE DATA AND SPECIFICATIONS (SDS)

Intake Air Temperature Sensor
Temperature °C (°F) 25 (77)
Crankshaft Position Sensor (POS)
Refer toEC-326, "Component Inspection" .
Camshaft Position Sensor (PHASE)
Refer to EC-334, "Component Inspection" .
Fuel Tank Temperature Sensor
Temperature °C (°F) 20 (68) 50 (122)

Resistance k 1.800 - 2.200
Resistance k 2.3 - 2.7
0.79 - 0.90

[QG18DE]
UBS00BII
UBS00BIK UBS00KTC
UBS00BIL

Revision: December 2006

EC-604

2006 Sentra

INDEX FOR DTC

[QR25DE]

INDEX FOR DTC DTC No. Index

PFP:00024
A
UBS00KJE

NOTE: G If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC EC
U1000, U1001. Refer to EC-743, "DTC U1000, U1001 CAN COMMUNICATION LINE" .

G If DTC U1010 is displayed with other DTC, first perform the trouble diagnosis for DTC U1010. Refer

to EC-746, "DTC U1010 CAN COMMUNICATION" .

C

DTC*1
CONSULT-II GST*2

ECM*3

Items (CONSULT-II screen terms)

Reference page
D

U1000

1000*4

CAN COMM CIRCUIT

EC-743

U1001

1001*4

CAN COMM CIRCUIT

EC-743

E

U1010

1010

CONTROL UNIT(CAN)

EC-746

P0000

0000

NO DTC IS DETECTED. FURTHER TESTING MAY BE REQUIRED.

--

F

P0011 P0031

0011 0031

INT/V TIM CONT-B1 A/F SEN1 HTR (B1)

EC-748

EC-752

G

P0032

0032

A/F SEN1 HTR (B1)

EC-752

P0037 P0038

0037 0038

HO2S2 HTR (B1) HO2S2 HTR (B1)

EC-757

H

EC-757

P0075

0075

INT/V TIM V/CIR-B1

EC-763

P0101

0101

MAF SEN/CIRCUIT

EC-768

I

P0102

0102

MAF SEN/CIRCUIT

EC-777

P0103 P0112

0103 0112

MAF SEN/CIRCUIT IAT SEN/CIRCUIT

EC-777
J
EC-785

P0113

0113

IAT SEN/CIRCUIT

EC-785

P0117 P0118

0117 0118

ECT SEN/CIRC ECT SEN/CIRC

EC-791

K

EC-791

P0122 P0123

0122 0123

TP SEN 2/CIRC TP SEN 2/CIRC

EC-797
L
EC-797

P0125

0125

ECT SENSOR

EC-804

P0127 P0128

0127 0128

IAT SENSOR THERMSTAT FNCTN

EC-807

M

EC-810

P0130

0130

A/F SENSOR1 (B1)

EC-812

P0131

0131

A/F SENSOR1 (B1)

EC-819

P0132

0132

A/F SENSOR1 (B1)

EC-825

P0133

0133

A/F SENSOR1 (B1)

EC-831

P0137

0137

HO2S2 (B1)

EC-841

P0138

0138

HO2S2 (B1)

EC-849

P0139

0139

HO2S2 (B1)

EC-859

P0171

0171

FUEL SYS-LEAN-B1

EC-867

P0172

0172

FUEL SYS-RICH-B1

EC-875

P0181

0181

FTT SENSOR

EC-882

P0182

0182

FTT SEN/CIRCUIT

EC-887

P0183

0183

FTT SEN/CIRCUIT

EC-887

Revision: December 2006

EC-605

2006 Sentra

DTC*1 CONSULT-II
GST*2 P0222 P0223 P0300 P0301 P0302 P0303 P0304 P0327 P0328 P0335 P0340 P0420 P0441 P0442 P0443 P0444 P0445 P0447 P0448 P0451 P0452 P0453 P0455 P0456 P0460 P0461 P0462 P0463 P0500 P0506 P0507 P0550 P0603 P0605 P0643 P0705 P0710 P0720 P0725 P0731 P0732 P0733

ECM*3
0222 0223 0300 0301 0302 0303 0304 0327 0328 0335 0340 0420 0441 0442 0443 0444 0445 0447 0448 0451 0452 0453 0455 0456 0460 0461 0462 0463 0500 0506 0507 0550 0603 0605 0643 0705 0710 0720 0725 0731 0732 0733

Revision: December 2006

INDEX FOR DTC
Items (CONSULT-II screen terms)
TP SEN 1/CIRC TP SEN 1/CIRC MULTI CYL MISFIRE CYL 1 MISFIRE CYL 2 MISFIRE CYL 3 MISFIRE CYL 4 MISFIRE KNOCK SEN/CIRC-B1 KNOCK SEN/CIRC-B1 CKP SEN/CIRCUIT CMP SEN/CIRC-B1 TW CATALYST SYS-B1 EVAP PURG FLOW/MON EVAP SMALL LEAK PURG VOLUME CONT/V PURG VOLUME CONT/V PURG VOLUME CONT/V VENT CONTROL VALVE VENT CONTROL VALVE EVAP SYS PRES SEN EVAP SYS PRES SEN EVAP SYS PRES SEN EVAP GROSS LEAK EVAP VERY SML LEAK FUEL LEV SEN SLOSH FUEL LEVEL SENSOR FUEL LEVL SEN/CIRC FUEL LEVL SEN/CIRC VEH SPEED SEN/CIRC*5 ISC SYSTEM ISC SYSTEM PW ST P SEN/CIRC ECM BACK UP/CIRC ECM SENSOR POWER/CIRC PNP SW/CIRC ATF TEMP SEN/CIRC VEH SPD SEN/CIR AT*5 ENGINE SPEED SIG A/T 1ST GR FNCTN A/T 2ND GR FNCTN A/T 3RD GR FNCTN
EC-606

[QR25DE]
Reference page
EC-891 EC-891 EC-898 EC-898 EC-898 EC-898 EC-898 EC-905 EC-905 EC-910 EC-917 EC-924 EC-929 EC-935 EC-944 EC-952 EC-952 EC-959 EC-966 EC-973 EC-976 EC-983 EC-991 EC-999 EC-1009 EC-1011 EC-1013 EC-1013 EC-1015 EC-1017 EC-1019 EC-1021 EC-1026 EC-1030 EC-1033 AT-486 AT-492 AT-498 AT-503 AT-507 AT-512 AT-517
2006 Sentra

INDEX FOR DTC

DTC*1
CONSULT-II GST*2

ECM*3

Items (CONSULT-II screen terms)

P0734

0734

A/T 4TH GR FNCTN

P0740

0740

TCC SOLENOID/CIRC

P0744

0744

A/T TCC S/V FNCTN

P0745

0745

L/PRESS SOL/CIRC

P0750

0750

SFT SOL A/CIRC

P0755

0755

SFT SOL B/CIRC

P0850

0850

P-N POS SW/CIRCUIT

P1148

1148

CLOSED LOOP-B1

P1217

1217

ENG OVER TEMP

P1225

1225

CTP LEARNING

P1226

1226

CTP LEARNING

P1564

1564

ASCD SW

P1572

1572

ASCD BRAKE SW

P1574

1574

ASCD VHL SPD SEN

P1610 - P1615

1610 - 1615

NATS MALFUNCTION

P1705

1705

TP SEN/CIRC A/T

P1760

1760

O/R CLTCH SOL/CIRC

P1800

1800

VIAS S/V CIRC

P1805

1805

BRAKE SW/CIRCUIT

P2100

2100

ETC MOT PWR

P2101

2101

ETC FUNCTION/CIRC

P2103

2103

ETC MOT PWR

P2118

2118

ETC MOT

P2119

2119

ETC ACTR

P2122

2122

APP SEN 1/CIRC

P2123

2123

APP SEN 1/CIRC

P2127

2127

APP SEN 2/CIRC

P2128

2128

APP SEN 2/CIRC

P2135

2135

TP SENSOR

P2138

2138

APP SENSOR

P2A00

2A00

A/F SENSOR1 (B1)

*1: 1st trip DTC No. is the same as DTC No. *2: This number is prescribed by SAE J2012. *3: In Diagnostic Test Mode II (Self-diagnostic results), this number is controlled by NISSAN. *4: The troubleshooting for this DTC needs CONSULT-II. *5: When the fail-safe operations for both self-diagnoses occur, the MIL illuminates.

[QR25DE]

Reference page

A

AT-522

EC

AT-529

AT-534

AT-542

C

AT-548

AT-553
D
EC-1038

EC-1042

EC-1043

E

EC-1056

EC-1058

EC-1060

F

EC-1067

EC-1078

G

EC-641

AT-558

AT-563

H

EC-1080

EC-1085

I

EC-1090

EC-1096

EC-1090

J

EC-1103

EC-1108
K
EC-1110

EC-1110

EC-1117

L

EC-1117

EC-1125
M
EC-1132

EC-1140

Revision: December 2006

EC-607

2006 Sentra

INDEX FOR DTC

[QR25DE]

Alphabetical Index

UBS00KJF

NOTE: G If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-743, "DTC U1000, U1001 CAN COMMUNICATION LINE" .
G If DTC U1010 is displayed with other DTC, first perform the trouble diagnosis for DTC U1010. Refer to EC-746, "DTC U1010 CAN COMMUNICATION" .

Items (CONSULT-II screen terms)
A/F SENSOR1 (B1) A/F SENSOR1 (B1) A/F SENSOR1 (B1) A/F SENSOR1 (B1) A/F SENSOR1 (B1) A/F SEN1 HTR (B1) A/F SEN1 HTR (B1) A/T 1ST GR FNCTN A/T 2ND GR FNCTN A/T 3RD GR FNCTN A/T 4TH GR FNCTN A/T TCC S/V FNCTN APP SEN 1/CIRC APP SEN 1/CIRC APP SEN 2/CIRC APP SEN 2/CIRC APP SENSOR ASCD BRAKE SW ASCD SW ASCD VHL SPD SEN ATF TEMP SEN/CIRC BRAKE SW/CIRCUIT CAN COMM CIRCUIT CAN COMM CIRCUIT CKP SEN/CIRCUIT CLOSED LOOP-B1 CMP SEN/CIRC-B1 CONTROL UNIT(CAN) CTP LEARNING CTP LEARNING CYL 1 MISFIRE CYL 2 MISFIRE CYL 3 MISFIRE CYL 4 MISFIRE ECM ECM BACK UP/CIRC ECT SEN/CIRC

CONSULT-II GST*2 P0130 P0131 P0132 P0133 P2A00 P0031 P0032 P0731 P0732 P0733 P0734 P0744 P2122 P2123 P2127 P2128 P2138 P1572 P1564 P1574 P0710 P1805

DTC*1

U1000

U1001

P0335 P1148 P0340 U1010 P1225 P1226 P0301 P0302 P0303 P0304 P0605 P0603 P0117

ECM*3
0130 0131 0132 0133 2A00 0031 0032 0731 0732 0733 0734 0744 2122 2123 2127 2128 2138 1572 1564 1574 0710 1805 1000*4 1001*4 0335 1148 0340 1010 1225 1226 0301 0302 0303 0304 0605 0603 0117

Reference page
EC-812 EC-819 EC-825 EC-831 EC-1140 EC-752 EC-752 AT-507 AT-512 AT-517 AT-522 AT-534 EC-1110 EC-1110 EC-1117 EC-1117 EC-1132 EC-1067 EC-1060 EC-1078 AT-492 EC-1085 EC-743 EC-743 EC-910 EC-1042 EC-917 EC-746 EC-1056 EC-1058 EC-898 EC-898 EC-898 EC-898 EC-1030 EC-1026 EC-791

Revision: December 2006

EC-608

2006 Sentra

Items (CONSULT-II screen terms)
ECT SEN/CIRC ECT SENSOR ENG OVER TEMP ENGINE SPEED SIG ETC ACTR ETC FUNCTION/CIRC ETC MOT ETC MOT PWR ETC MOT PWR EVAP GROSS LEAK EVAP PURG FLOW/MON EVAP SMALL LEAK EVAP SYS PRES SEN EVAP SYS PRES SEN EVAP SYS PRES SEN EVAP VERY SML LEAK FTT SEN/CIRCUIT FTT SEN/CIRCUIT FTT SENSOR FUEL LEV SEN SLOSH FUEL LEVEL SENSOR FUEL LEVL SEN/CIRC FUEL LEVL SEN/CIRC FUEL SYS-LEAN-B1 FUEL SYS-RICH-B1 HO2S2 (B1) HO2S2 (B1) HO2S2 (B1) HO2S2 HTR (B1) HO2S2 HTR (B1) IAT SEN/CIRCUIT IAT SEN/CIRCUIT IAT SENSOR INT/V TIM CONT-B1 INT/V TIM V/CIR-B1 ISC SYSTEM ISC SYSTEM KNOCK SEN/CIRC-B1 KNOCK SEN/CIRC-B1 L/PRESS SOL/CIRC MAF SEN/CIRCUIT MAF SEN/CIRCUIT
Revision: December 2006

INDEX FOR DTC

DTC*1 CONSULT-II
GST*2 P0118 P0125 P1217 P0725 P2119 P2101 P2118 P2100 P2103 P0455 P0441 P0442 P0451 P0452 P0453 P0456 P0182 P0183 P0181 P0460 P0461 P0462 P0463 P0171 P0172 P0137 P0138 P0139 P0037 P0038 P0112 P0113 P0127 P0011 P0075 P0506 P0507 P0327 P0328 P0745 P0101 P0102

ECM*3
0118 0125 1217 0725 2119 2101 2118 2100 2103 0455 0441 0442 0451 0452 0453 0456 0182 0183 0181 0460 0461 0462 0463 0171 0172 0137 0138 0139 0037 0038 0112 0113 0127 0011 0075 0506 0507 0327 0328 0745 0101 0102

EC-609

[QR25DE]

Reference page

A

EC-791

EC

EC-804

EC-1043

AT-503

C

EC-1108

EC-1096
D
EC-1103

EC-1090

EC-1090

E

EC-991

EC-929

EC-935

F

EC-973

EC-976

G

EC-983

EC-999

EC-887

H

EC-887

EC-882

I

EC-1009

EC-1011

EC-1013

J

EC-1013

EC-867
K
EC-875

EC-841

EC-849

L

EC-859

EC-757
M
EC-757

EC-785

EC-785

EC-807

EC-748

EC-763

EC-1017

EC-1019

EC-905

EC-905

AT-542

EC-768

EC-777

2006 Sentra

INDEX FOR DTC

Items (CONSULT-II screen terms)

CONSULT-II GST*2

DTC*1

ECM*3

MAF SEN/CIRCUIT

P0103

0103

MULTI CYL MISFIRE

P0300

0300

NATS MALFUNCTION

P1610 - P1615

1610 - 1615

NO DTC IS DETECTED. FURTHER TESTING MAY BE REQUIRED.

P0000

0000

O/R CLTCH SOL/CIRC

P1760

1760

P-N POS SW/CIRCUIT

P0850

0850

PNP SW/CIRC

P0705

0705

PURG VOLUME CONT/V

P0443

0443

PURG VOLUME CONT/V

P0444

0444

PURG VOLUME CONT/V

P0445

0445

PW ST P SEN/CIRC

P0550

0550

SENSOR POWER/CIRC

P0643

0643

SFT SOL A/CIRC

P0750

0750

SFT SOL B/CIRC

P0755

0755

TCC SOLENOID/CIRC

P0740

0740

THERMSTAT FNCTN

P0128

0128

TP SEN 1/CIRC

P0222

0222

TP SEN 1/CIRC

P0223

0223

TP SEN 2/CIRC

P0122

0122

TP SEN 2/CIRC

P0123

0123

TP SENSOR

P2135

2135

TP SEN/CIRC A/T

P1705

1705

TW CATALYST SYS-B1

P0420

0420

VEH SPD SEN/CIR AT*5

P0720

0720

VEH SPEED SEN/CIRC*5

P0500

0500

VENT CONTROL VALVE

P0447

0447

VENT CONTROL VALVE

P0448

0448

VIAS S/V CIRC

P1800

1800

*1: 1st trip DTC No. is the same as DTC No. *2: This number is prescribed by SAE J2012. *3: In Diagnostic Test Mode II (Self-diagnostic results), this number is controlled by NISSAN. *4: The troubleshooting for this DTC needs CONSULT-II. *5: When the fail-safe operations for both self-diagnoses occur, the MIL illuminates.

[QR25DE]
Reference page
EC-777 EC-898 EC-641
--
AT-563 EC-1038 AT-486 EC-944 EC-952 EC-952 EC-1021 EC-1033 AT-548 AT-553 AT-529 EC-810 EC-891 EC-891 EC-797 EC-797 EC-1125 AT-558 EC-924 AT-498 EC-1015 EC-959 EC-966 EC-1080

Revision: December 2006

EC-610

2006 Sentra

PRECAUTIONS

[QR25DE]

PRECAUTIONS

PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT A

BELT PRE-TENSIONER"

UBS00KU5

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along EC

with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain

types of collision. Information necessary to service the system safely is included in the SRS and SB section of

this Service Manual.

C

WARNING:

G To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death

in the event of a collision which would result in air bag inflation, all maintenance must be per-

formed by an authorized NISSAN/INFINITI dealer.

D

G Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-

sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air

Bag Module, see the SRS section.

E

G Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this

Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or

harness connectors.

F

On Board Diagnostic (OBD) System of Engine and A/T

UBS00J8T

The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the G driver of a malfunction causing emission deterioration.

CAUTION:

G

Be sure to turn the ignition switch OFF and disconnect the battery ground cable before any repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will

H

cause the MIL to light up.

G Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will cause the MIL to light up due to the open circuit. (Be sure the connector is free from water, grease, I dirt, bent terminals, etc.)

G Certain systems and components, especially those related to OBD, may use a new style slidelocking type harness connector. For description and how to disconnect, refer to PG-47, "HAR- J
NESS CONNECTOR" .

G Be sure to route and secure the harnesses properly after work. The interference of the harness

with a bracket, etc. may cause the MIL to light up due to the short circuit.

K

G Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube may cause the MIL to light up due to the malfunction of the fuel injection system, etc.

G Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM and L TCM (Transmission control module) before returning the vehicle to the customer.

Precaution
G Always use a 12 volt battery as power source.
G Do not attempt to disconnect battery cables while engine is running.
G Before connecting or disconnecting the ECM harness connector, turn ignition switch OFF and disconnect battery ground cable. Failure to do so may damage the ECM because battery voltage is applied to ECM even if ignition switch is turned OFF.
G Before removing parts, turn ignition switch OFF and then disconnect battery ground cable.

UBS00J8U
M
SEF289H

Revision: December 2006

EC-611

2006 Sentra

PRECAUTIONS
G Do not disassemble ECM. G If battery cable is disconnected, the memory will return to
the initial ECM values. The ECM will now start to self-control at its initial values. Engine operation can vary slightly when the cable is disconnected. However, this is not an indication of a malfunction. Do not replace parts because of a slight variation. G If the battery is disconnected, the following emissionrelated diagnostic information will be lost within 24 hours. ­ Diagnostic trouble codes ­ 1st trip diagnostic trouble codes ­ Freeze frame data ­ 1st trip freeze frame data ­ System readiness test (SRT) codes ­ Test values
G When connecting ECM harness connector, fasten it securely with a lever as far as it will go as shown in the figure.

G When connecting or disconnecting pin connectors into or from ECM, take care not to damage pin terminals (bend or break). Make sure that there are not any bends or breaks on ECM pin terminal, when connecting pin connectors.
G Securely connect ECM harness connectors. A poor connection can cause an extremely high (surge) voltage to develop in coil and condenser, thus resulting in damage to ICs.
G Keep engine control system harness at least 10 cm (4 in) away from adjacent harness, to prevent engine control system malfunctions due to receiving external noise, degraded operation of ICs, etc.
G Keep engine control system parts and harness dry.
G Before replacing ECM, perform "ECM Terminals and Reference Value" inspection and make sure ECM functions properly. Refer to EC-698 .
G Handle mass air flow sensor carefully to avoid damage.
G Do not disassemble mass air flow sensor.
G Do not clean mass air flow sensor with any type of detergent.
G Do not disassemble electric throttle control actuator.
G Even a slight leak in the air intake system can cause serious incidents.
G Do not shock or jar the camshaft position sensor (PHASE), crankshaft position sensor (POS).

Revision: December 2006

EC-612

[QR25DE]
PBIB1164E
MBIB0145E PBIB0090E MEF040D
2006 Sentra

PRECAUTIONS
G After performing each TROUBLE DIAGNOSIS, perform DTC Confirmation Procedure or Overall Function Check. The DTC should not be displayed in the DTC Confirmation Procedure if the repair is completed. The Overall Function Check should be a good result if the repair is completed.
G When measuring ECM signals with a circuit tester, never allow the two tester probes to contact. Accidental contact of probes will cause a short circuit and damage the ECM power transistor.
G Do not use ECM ground terminals when measuring input/ output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
G Do not operate fuel pump when there is no fuel in lines. G Tighten fuel hose clamps to the specified torque.

[QR25DE]
A

EC

C
SEF217U
D

E

F

G H

I

J

SEF348N

K

L

M

PBIB1218E

Revision: December 2006

EC-613

2006 Sentra

PRECAUTIONS
G Do not depress accelerator pedal when starting. G Immediately after starting, do not rev up engine unneces-
sarily. G Do not rev up engine just prior to shutdown.
G When installing C.B. ham radio or a mobile phone, be sure to observe the following as it may adversely affect electronic control systems depending on installation location.
­ Keep the antenna as far as possible from the electronic control units.
­ Keep the antenna feeder line more than 20 cm (8 in) away from the harness of electronic controls. Do not let them run parallel for a long distance.
­ Adjust the antenna and feeder line so that the standingwave radio can be kept smaller.
­ Be sure to ground the radio to vehicle body.

[QR25DE]
SEF709Y SEF708Y

Revision: December 2006

EC-614

2006 Sentra

PREPARATION

[QR25DE]

PREPARATION

Special Service Tools

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Tool number (Kent-Moore No.) Tool name

Description

PFP:00002
A
UBS00KJG
EC

KV10114400 (J-38365) Heated oxygen sensor wrench

Loosening or tightening heated oxygen sensor 2

a: 22 mm (0.87 in)

C

D

(J-44626) Air fuel ratio (A/F) sensor wrench

S-NT636

Loosening or tightening air fuel ratio (A/F) sensor 1

E

F

(J-44321) Fuel pressure gauge kit

LEM054

G

Checking fuel pressure

H

KV109E0010 (J-46209) Break-out box

LEC642

I
Measuring the ECM signals with a circuit tester
J

KV109E0080 (J-45819) Y-cable adapter
EG17650301 (J-33984-A) Radiator cap tester adapter

S-NT825 S-NT826 S-NT564

K
Measuring the ECM signals with a circuit tester
L
M
Adapting radiator cap tester to radiator cap and radiator filler neck a: 28 (1.10) dia. b: 31.4 (1.236) dia. c: 41.3 (1.626) dia. Unit: mm (in)

Revision: December 2006

EC-615

2006 Sentra

Commercial Service Tools

Tool name (Kent-Moore No.)
Fuel filler cap adapter (J-45356)

Description

PREPARATION

[QR25DE]
UBS00KJH

Checking fuel tank vacuum relief valve opening pressure

Leak detector ie: (J-41416)

S-NT815

Locating the EVAP leak

EVAP service port adapter ie: (J-41413-OBD)
Socket wrench

S-NT703

Applying positive pressure through EVAP service port

S-NT704

Removing and installing engine coolant temperature sensor

Oxygen sensor thread cleaner ie: (J-43897-18) (J-43897-12)
Anti-seize lubricant ie: (PermatexTM 133AR or equivalent meeting MIL specification MIL-A-907)

S-NT705 AEM488

Reconditioning the exhaust system threads before installing a new oxygen sensor. Use with anti-seize lubricant shown below. a: 18 mm diameter with pitch 1.5 mm for Zirconia Oxygen Sensor b: 12 mm diameter with pitch 1.25 mm for Titania Oxygen Sensor
Lubricating oxygen sensor thread cleaning tool when reconditioning exhaust system threads.

S-NT779

Revision: December 2006

EC-616

2006 Sentra

ENGINE CONTROL SYSTEM
ENGINE CONTROL SYSTEM System Diagram

[QR25DE]
PFP:23710
A
UBS00KJC
EC C D E
F G H I J K L M

Revision: December 2006

EC-617

PBIB3084E
2006 Sentra

ENGINE CONTROL SYSTEM

[QR25DE]

Multiport Fuel Injection (MFI) System
INPUT/OUTPUT SIGNAL CHART

UBS00KJD

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS) Camshaft position sensor (PHASE)

Engine speed*1 Piston position

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Air fuel ratio (A/F) sensor 1

Density of oxygen in exhaust gas

Throttle position sensor Accelerator pedal position sensor Park/neutral position (PNP) switch Knock sensor

Throttle position Accelerator pedal position Gear position Engine knocking condition

Fuel injection & mixture ratio control

Fuel injector

Battery

Battery voltage*1

Power steering pressure sensor

Power steering operation

Heated oxygen sensor 2*2

Density of oxygen in exhaust gas

Vehicle speed sensor

Vehicle speed*3

Air conditioner switch

Air conditioner operation

*1: ECM determines the start signal status by the signal of engine speed and battery voltage. *2: Under normal conditions, this sensor is not for engine control operation. *3: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION
The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the ECM memory. The program value is preset by engine operating conditions. These conditions are determined by input signals (for engine speed and intake air) from both the crankshaft position sensor and the mass air flow sensor.

VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION In addition, the amount of fuel injected is compensated to improve engine performance under various operating conditions as listed below. <Fuel increase> G During warm-up G When starting the engine G During acceleration G Hot-engine operation G When selector lever is changed from N to D (A/T models) G High-load, high-speed operation <Fuel decrease> G During deceleration G During high engine speed operation

Revision: December 2006

EC-618

2006 Sentra

ENGINE CONTROL SYSTEM
MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)

[QR25DE]
A

EC

C

PBIB3020E

D

The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission control.

The three way catalyst (manifold) can then better reduce CO, HC and NOx emissions. This system uses air

fuel ratio (A/F) sensor 1 in the exhaust manifold to monitor if the engine operation is rich or lean. The ECM adjusts the injection pulse width according to the sensor voltage signal. For more information about air fuel

E

ratio (A/F) sensor 1, refer to EC-812 . This maintains the mixture ratio within the range of stoichiometric (ideal

air-fuel mixture).

This stage is referred to as the closed loop control condition.

F

Heated oxygen sensor 2 is located downstream of the three way catalyst (manifold). Even if the switching

characteristics of air-fuel ratio (A/F) sensor 1 shift, the air-fuel ratio is controlled to stoichiometric by the signal

from heated oxygen sensor 2.

G

Open Loop Control

The open loop system condition refers to when the ECM detects any of the following conditions. Feedback

control stops in order to maintain stabilized fuel combustion.

H

G Deceleration and acceleration

G High-load, high-speed operation

G Malfunction of air fuel ratio (A/F) sensor 1 or its circuit

I

G Insufficient activation of A/F sensor 1 at low engine coolant temperature

G High engine coolant temperature

J

G During warm-up

G After shifting from N to D (A/T models)

G When starting the engine

K

MIXTURE RATIO SELF-LEARNING CONTROL

The mixture ratio feedback control system monitors the mixture ratio signal transmitted from air fuel ratio (A/F)

sensor 1. This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to L

the theoretical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as orig-

inally designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic

changes during operation (i.e., fuel injector clogging) directly affect mixture ratio.

M

Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is

then computed in terms of "injection pulse duration" to automatically compensate for the difference between

the two ratios.

"Fuel trim" refers to the feedback compensation value compared against the basic injection duration. Fuel trim

includes short term fuel trim and long term fuel trim.

"Short term fuel trim" is the short-term fuel compensation used to maintain the mixture ratio at its theoretical

value. The signal from A/F sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the the-

oretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and an increase in

fuel volume if it is lean.

"Long term fuel trim" is overall fuel compensation carried out long-term to compensate for continual deviation

of the short term fuel trim from the central value. Such deviation will occur due to individual engine differences,

wear over time and changes in the usage environment.

Revision: December 2006

EC-619

2006 Sentra

FUEL INJECTION TIMING

ENGINE CONTROL SYSTEM

[QR25DE]

Two types of systems are used.

SEF337W

Sequential Multiport Fuel Injection System
Fuel is injected into each cylinder during each engine cycle according to the firing order. This system is used when the engine is running.

Simultaneous Multiport Fuel Injection System
Fuel is injected simultaneously into all four cylinders twice each engine cycle. In other words, pulse signals of the same width are simultaneously transmitted from the ECM. The four fuel injectors will then receive the signals two times for each engine cycle. This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.

FUEL SHUT-OFF
Fuel to each cylinder is cut off during deceleration, operation of the engine at excessively high speeds or operation of the vehicle at excessively high speeds.

Electronic Ignition (EI) System
INPUT/OUTPUT SIGNAL CHART

UBS00J90

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)

Engine speed*1

Camshaft position sensor (PHASE)

Piston position

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor Throttle position sensor Accelerator pedal position sensor Knock sensor

Engine coolant temperature Throttle position Accelerator pedal position Engine knocking

Ignition timing con- Power transistor trol

Park/neutral position (PNP) switch

Gear position

Vehicle speed sensor

Vehicle speed*2

Battery

Battery voltage*1

*1: ECM determines the start signal status by the signal of engine speed and battery voltage. *2: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION
Firing order: 1 - 3 - 4 - 2 The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the engine. The ignition timing data is stored in the ECM. The ECM receives information such as the injection pulse width and camshaft position sensor signal. Computing this information, ignition signals are transmitted to the power transistor. During the following conditions, the ignition timing is revised by the ECM according to the other data stored in the ECM.
G At starting
G During warm-up
G At idle

Revision: December 2006

EC-620

2006 Sentra

ENGINE CONTROL SYSTEM

[QR25DE]

G At low battery voltage

G During acceleration

A

The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition. EC The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition.

Fuel Cut Control (at No Load and High Engine Speed)
INPUT/OUTPUT SIGNAL CHART

UBS00J91
C

Sensor

Input Signal to ECM

ECM function

Actuator

Park/neutral position (PNP) switch

Neutral position

D

Accelerator pedal position sensor

Accelerator pedal position

Engine coolant temperature sensor
Crankshaft position sensor (POS) Camshaft position sensor (PHASE)

Engine coolant temperature Engine speed

Fuel cut control

Fuel injector

E

Vehicle speed sensor

Vehicle speed*

F

*: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION
G If the engine speed is above 1,800 rpm under no load (for example, the shift position is neutral and engine

speed is over 1,800 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies

based on engine speed.

Fuel cut will be operated until the engine speed reaches 1,500 rpm, then fuel cut will be cancelled.

H

NOTE:

This function is different from deceleration control listed under "Multiport Fuel Injection (MFI) System", EC-618

.

I

J

K

L

M

Revision: December 2006

EC-621

2006 Sentra

AIR CONDITIONING CUT CONTROL

AIR CONDITIONING CUT CONTROL Input/output Signal Chart

Sensor

Input Signal to ECM

ECM function

Air conditioner switch

Air conditioner ON signal

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Crankshaft position sensor (POS) Camshaft position sensor (PHASE)
Engine coolant temperature sensor
Refrigerant pressure sensor

Engine speed*1 Engine coolant temperature Refrigerant pressure

Air conditioner cut control

Power steering pressure sensor

Power steering operation

Vehicle speed sensor

Vehicle speed*2

Battery

Battery voltage*1

*1: ECM determines the start signal status by the signal of engine speed and battery voltage. *2: This signal is sent to the ECM through CAN communication line.

System Description

This system improves engine operation when the air conditioner is used. Under the following conditions, the air conditioner is turned off. G When the accelerator pedal is fully depressed. G When cranking the engine. G At high engine speeds. G When the engine coolant temperature becomes excessively high. G When operating power steering during low engine speed or low vehicle speed. G When engine speed is excessively low. G When refrigerant pressure is excessively low or high.

[QR25DE]
PFP:23710
UBS00J92
Actuator
Air conditioner relay
UBS00J93

Revision: December 2006

EC-622

2006 Sentra

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

[QR25DE]

AUTOMATIC SPEED CONTROL DEVICE (ASCD)
System Description
INPUT/OUTPUT SIGNAL CHART

PFP:18930
A
UBS00JT1

Sensor ASCD brake switch

Input signal to ECM Brake pedal operation

ECM function

Actuator

EC

Stop lamp switch

Brake pedal operation

ASCD clutch switch (M/T models) Clutch pedal operation

C

ASCD steering switch
Park/Neutral position (PNP) switch (A/T models)

ASCD steering switch operation ASCD vehicle speed control Gear position

Electric throttle control actuator

D

Vehicle speed sensor

Vehicle speed*

TCM

Powertrain revolution*

E

*: This signal is sent to the ECM through CAN communication line.

BASIC ASCD SYSTEM

Refer to Owner's Manual for ASCD operating instructions.

F

Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed

without depressing accelerator pedal. Driver can set vehicle speed in advance between approximately 40 km/

h (25 MPH) and 144 km/h (89 MPH).

G

ECM controls throttle angle of electric throttle control actuator to regulate engine speed.

Operation status of ASCD is indicated by CRUISE indicator and SET indicator in combination meter. If any

malfunction occurs in ASCD system, it automatically deactivates the control.

H

NOTE:

Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws.

SET OPERATION

I

Press MAIN switch. (The CRUISE indicator in combination meter illuminates.)

When vehicle speed reaches a desired speed between approximately 40 km/h (25 MPH) and 144 km/h (89

MPH), press SET/COAST switch. (Then SET indicator in combination meter illuminates.)

J

ACCEL OPERATION

If the RESUME/ACCELERATE switch is depressed during cruise control driving, increase the vehicle speed

until the switch is released or vehicle speed reaches maximum speed controlled by the system.

K

And then ASCD will keep the new set speed.

CANCEL OPERATION
L When any of following conditions exist, cruise operation will be canceled.
G CANCEL switch is pressed
G More than 2 switches at ASCD steering switch are pressed at the same time (Set speed will be cleared) M G Brake pedal is depressed
G Clutch pedal is depressed or gear position is changed to the neutral position (M/T models)
G Selector lever is changed to N, P, R position (A/T models)
G Vehicle speed decreased to 13 km/h (8 MPH) lower than the set speed
When the ECM detects any of the following conditions, the ECM will cancel the cruise operation and inform the driver by blinking indicator lamp.
G Engine coolant temperature is slightly higher than the normal operating temperature, CRUISE lamp may blink slowly. When the engine coolant temperature decreases to the normal operating temperature, CRUISE lamp will stop blinking and the cruise operation will be able to work by pressing SET/COAST switch or RESUME/ ACCELERATE switch.
G Malfunction for some self-diagnoses regarding ASCD control: SET lamp will blink quickly.

COAST OPERATION
When the SET/COAST switch is pressed during cruise control driving, decrease vehicle set speed until the switch is released. And then ASCD will keep the new set speed.

Revision: December 2006

EC-623

2006 Sentra

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

[QR25DE]

RESUME OPERATION When the RESUME/ACCELERATE switch is pressed after cancel operation other than pressing MAIN switch is performed, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition must meet following conditions.
G Brake pedal is released. G Clutch pedal is released (M/T models).
G A/T selector lever is in other than P and N positions (A/T models). G Vehicle speed is greater than 40 km/h (25 MPH) and less than 144 km/h (89 MPH).

Component Description
ASCD STEERING SWITCH
Refer to EC-1060 .

UBS00JT2

ASCD BRAKE SWITCH Refer to EC-1085 and EC-1147 .

ASCD CLUTCH SWITCH Refer to EC-1067 .

STOP LAMP SWITCH Refer to EC-1067 , EC-1067 and EC-1147 .

ELECTRIC THROTTLE CONTROL ACTUATOR Refer to EC-1090 , EC-1096 , EC-1103 and EC-1108 .

ASCD INDICATOR Refer to EC-1157 .

Revision: December 2006

EC-624

2006 Sentra

CAN COMMUNICATION

[QR25DE]

CAN COMMUNICATION System Description

PFP:23710
A
UBS00J96

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec- EC

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.

Each control unit transmits/receives data but selectively reads required data only.

C

Refer to LAN-14 , about CAN communication for detail.

D

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-625

2006 Sentra

EVAPORATIVE EMISSION SYSTEM
EVAPORATIVE EMISSION SYSTEM Description
SYSTEM DESCRIPTION

[QR25DE]
PFP:14950
UBS00JT3

PBIB2508E
The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister. The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the vapor is stored there when the engine is not operating or when refueling to the fuel tank. The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the engine operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is proportionally regulated as the air flow increases. EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating.

Revision: December 2006

EC-626

2006 Sentra

EVAPORATIVE EMISSION SYSTEM
EVAPORATIVE EMISSION LINE DRAWING

[QR25DE]
A EC
C D E F G H I J K L M

BBIA0293E
NOTE: Do not use soapy water or any type of solvent while installing vacuum hose or purge hoses.

Revision: December 2006

EC-627

2006 Sentra

EVAPORATIVE EMISSION SYSTEM

[QR25DE]

Revision: December 2006

EC-628

BBIA0294E
2006 Sentra

EVAPORATIVE EMISSION SYSTEM
Component Inspection
EVAP CANISTER Check EVAP canister as follows: 1. Block port B . 2. Blow air into port A and check that it flows freely out of port C . 3. Release blocked port B . 4. Apply vacuum pressure to port B and check that vacuum pres-
sure exists at the ports A and C . 5. Block port A and B . 6. Apply pressure to port C and check that there is no leakage.
FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FULLER CAP) 1. Wipe clean valve housing.

2. Check valve opening pressure and vacuum.

Pressure: Vacuum:

15.3 - 20.0 kPa (0.156 - 0.204 kg/cm2 , 2.22 - 2.90 psi)
-6.0 to -3.3 kPa (-0.061 to -0.034 kg/cm2 , -0.87 to -0.48 psi)

3. If out of specification, replace fuel filler cap as an assembly.
CAUTION: Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may come on.

EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE Refer to EC-952

FUEL TANK TEMPERATURE SENSOR Refer to EC-882 .

EVAP CANISTER VENT CONTROL VALVE Refer to EC-959 .

EVAP CONTROL SYSTEM PRESSURE SENSOR Refer to EC-976 .

[QR25DE]
UBS00JT4
A

EC

C

D
PBIB1212E
E

F

G
H
SEF445Y
I

J

K

SEF943S

L

M

Revision: December 2006

EC-629

2006 Sentra

EVAPORATIVE EMISSION SYSTEM
EVAP SERVICE PORT Positive pressure is delivered to the EVAP system through the EVAP service port. If fuel vapor leakage in the EVAP system occurs, use a leak detector to locate the leak.

[QR25DE]

Removal and Installation
EVAP CANISTER
Tighten EVAP canister as shown in the figure.

SEF462UC UBS00JT5

EVAP CANISTER VENT CONTROL VALVE 1. Turn EVAP canister vent control valve counterclockwise. 2. Remove the EVAP canister vent control valve. Do not reuse the O-ring, replace it with a new one.

PBIB1214E

How to Detect Fuel Vapor Leakage
CAUTION: G Never use compressed air or a high pressure pump. G Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pressure in EVAP system. NOTE: G Do not start engine. G Improper installation of EVAP service port adapter to the EVAP service port may cause a leak.

PBIB3082E UBS00JT6

Revision: December 2006

EC-630

2006 Sentra

EVAPORATIVE EMISSION SYSTEM
WITH CONSULT-II 1. Attach the EVAP service port adapter securely to the EVAP service port. 2. Also attach the pressure pump and hose to the EVAP service port adapter. 3. Turn ignition switch ON. 4. Select the "EVAP SYSTEM CLOSE" of "WORK SUPPORT
MODE" with CONSULT-II. 5. Touch "START". A bar graph (Pressure indicating display) will
appear on the screen.
6. Apply positive pressure to the EVAP system until the pressure indicator reaches the middle of the bar graph.
7. Remove EVAP service port adapter and hose with pressure pump.
8. Locate the leak using a leak detector. Refer to EC-627, "EVAPORATIVE EMISSION LINE DRAWING" .
WITHOUT CONSULT-II 1. Attach the EVAP service port adapter securely to the EVAP ser-
vice port. 2. Also attach the pressure pump with pressure gauge to the EVAP
service port adapter.

[QR25DE]
A EC
C D E
PEF838U
F G H
PEF917U
I J K L
SEF200U
M
SEF462UC

Revision: December 2006

EC-631

2006 Sentra

EVAPORATIVE EMISSION SYSTEM

[QR25DE]

3. Apply battery voltage to the terminal of EVAP canister vent control valve to make a closed EVAP system.

BBIA0292E
4. To locate the leak, deliver positive pressure to the EVAP system until pressure gauge points reach 1.38 to 2.76 kPa (0.014 to 0.028 kg/cm2 , 0.2 to 0.4 psi).
5. Remove EVAP service port adapter and hose with pressure pump. 6. Locate the leak using a leak detector. Refer to EC-627, "EVAPORATIVE EMISSION LINE DRAWING" .

Revision: December 2006

EC-632

2006 Sentra

ON BOARD REFUELING VAPOR RECOVERY (ORVR)
ON BOARD REFUELING VAPOR RECOVERY (ORVR) System Description

[QR25DE]
PFP:00032
A
UBS00JT7
EC

C

D

E

F

G
PBIB1268E

From the beginning of refueling, the fuel tank pressure goes up. When the pressure reaches the setting value

of the refueling control valve (RCV) opening pressure, the RCV is opened. After RCV opens, the air and vapor

inside the fuel tank go through refueling EVAP vapor cut valve, RCV and EVAP/ORVR line to the EVAP canis- H

ter. The vapor is absorbed by the EVAP canister and the air is released to the atmosphere.

When the refueling has reached the full level of the fuel tank, the refueling EVAP vapor cut valve is closed and

refueling is stopped because of auto shut-off. The vapor which was absorbed by the EVAP canister is purged

during driving.

I

The RCV is always closed during driving and the evaporative emission control system is operated the same

as conventional system.

WARNING:

J

When conducting inspections below, be sure to observe the following:

G Put a "CAUTION: INFLAMMABLE" sign in workshop.

G Do not smoke while servicing fuel system. Keep open flames and sparks away from work area.

K

G Be sure to furnish the workshop with a CO2 fire extinguisher.

CAUTION:

G Before removing fuel line parts, carry out the following procedures:

L

­ Put drained fuel in an explosion-proof container and put lid on securely.

­ Release fuel pressure from fuel line. Refer to EC-673, "FUEL PRESSURE RELEASE" .

M

­ Disconnect battery ground cable.

G Always replace O-ring when the fuel gauge retainer is removed.

G Do not kink or twist hose and tube when they are installed.

G Do not tighten hose and clamps excessively to avoid damaging hoses.

G After installation, run engine and check for fuel leaks at connection.

G Do not attempt to top off the fuel tank after the fuel pump nozzle shuts off automatically. Continued refueling may cause fuel overflow, resulting in fuel spray and possibly a fire.

Revision: December 2006

EC-633

2006 Sentra

ON BOARD REFUELING VAPOR RECOVERY (ORVR)
Diagnostic Procedure
SYMPTOM: FUEL ODOR FROM EVAP CANISTER IS STRONG.
1. CHECK EVAP CANISTER

[QR25DE]
UBS00JT8

1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
2. Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached. The weight should be less than 1.9 kg (4.2 lb).
OK or NG
OK >> GO TO 2. NG >> GO TO 3.
2. CHECK IF EVAP CANISTER SATURATED WITH WATER

Does water drain from the EVAP canister? Yes or No
Yes >> GO TO 3. No >> GO TO 5.

3. REPLACE EVAP CANISTER
Replace EVAP canister with a new one.

PBIB1213E

>> GO TO 4.
4. DETECT MALFUNCTIONING PART
Check the EVAP hose between EVAP canister and vehicle frame for clogging or poor connection.

>> Repair or replace EVAP hose.
5. CHECK REFUELING CONTROL VALVE
Refer to EC-636, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> Replace refueling control valve.
6. CHECK REFUELING EVAP VAPOR CUT VALVE
Refer to EC-636, "Component Inspection" . OK or NG
OK >> INSPECTION END. NG >> Replace refueling EVAP vapor cut valve with fuel tank.

Revision: December 2006

EC-634

2006 Sentra

ON BOARD REFUELING VAPOR RECOVERY (ORVR)
[QR25DE]

SYMPTOM: CANNOT REFUEL/FUEL ODOR FROM THE FUEL FILLER OPENING IS STRONG

WHILE REFUELING.

A

1. CHECK EVAP CANISTER

1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor EC attached.

2. Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor

attached.

C

The weight should be less than 1.9 kg (4.2 lb).

OK or NG

OK >> GO TO 2.

D

NG >> GO TO 3.

2. CHECK IF EVAP CANISTER SATURATED WITH WATER

E

Does water drain from the EVAP canister?

Yes or No

Yes >> GO TO 3.

F

No >> GO TO 5.

G

H

3. REPLACE EVAP CANISTER

PBIB1031E
I

Replace EVAP canister with a new one.

J >> GO TO 4.

4. DETECT MALFUNCTIONING PART

K

Check the EVAP hose between EVAP canister and vehicle frame for clogging or poor connection.

>> Repair or replace EVAP hose.

L

5. CHECK VENT HOSES AND VENT TUBES
M Check hoses and tubes between EVAP canister and refueling control valve for clogging, kink, looseness and improper connection.
OK or NG
OK >> GO TO 6. NG >> Repair or replace hoses and tubes.

6. CHECK FILLER NECK TUBE

Check signal line and recirculation line for clogging, dents and cracks.
OK or NG OK >> GO TO 7. NG >> Replace filler neck tube.

Revision: December 2006

EC-635

2006 Sentra

ON BOARD REFUELING VAPOR RECOVERY (ORVR)
7. CHECK REFUELING CONTROL VALVE
Refer to EC-636, "Component Inspection" . OK or NG
OK >> GO TO 8. NG >> Replace refueling control valve.
8. CHECK REFUELING EVAP VAPOR CUT VALVE
Refer to EC-636, "Component Inspection" . OK or NG
OK >> GO TO 9. NG >> Replace refueling EVAP vapor cut valve with fuel tank.
9. CHECK FUEL FILLER TUBE
Check filler neck tube and hose connected to the fuel tank for clogging, dents and cracks. OK or NG
OK >> GO TO 10. NG >> Replace fuel filler tube.
10. CHECK ONE-WAY FUEL VALVE-I
Check one-way valve for clogging. OK or NG
OK >> GO TO 11. NG >> Repair or replace one-way fuel valve with fuel tank.
11. CHECK ONE-WAY FUEL VALVE-II
1. Make sure that fuel is drained from the tank. 2. Remove fuel filler tube and hose. 3. Check one-way fuel valve for operation as follows.
When a stick is inserted, the valve should open, when removing stick it should close. Do not drop any material into the tank. OK or NG OK >> INSPECTION END NG >> Replace fuel filler tube or replace one-way fuel valve
with fuel tank.

[QR25DE]

SEF665U

Component Inspection
REFUELING EVAP VAPOR CUT VALVE

UBS00JT9

With CONSULT-II 1. Remove fuel tank. Refer to FL-7, "FUEL TANK" .

2. Drain fuel from the tank as follows:

­ Remove fuel feed hose located on "fuel level sensor and fuel pump".

­ Connect a spare fuel hose, one side to fuel gauge retainer where the hose was removed and the other side to a fuel container.

­ Drain fuel using "FUEL PUMP RELAY" in "ACTIVE TEST" mode with CONSULT-II.

3. Check refueling EVAP vapor cut valve for being stuck to close as follows. Blow air into the refueling EVAP vapor cut valve (from hose end B ), and check that the air flows freely into the tank.

4. Check EVAP vapor cut valve for being stuck to open as follows.

Revision: December 2006

EC-636

2006 Sentra

ON BOARD REFUELING VAPOR RECOVERY (ORVR)
[QR25DE]

­ Connect vacuum pump to hose ends A and B using a suitable 3-way connector.

­ Remove fuel gauge retainer with fuel gauge unit.

A

Always replace O-ring with new one.

­ Put fuel tank upside down. ­ Apply vacuum pressure to both hose ends A and B [-13.3 kPa (-100 mmHg, -3.94 inHg)] with fuel EC
gauge retainer remaining open and check that the pressure is applicable.

C

D

E

F

G

H

BBIA0295E

With GST

1. Remove fuel tank. Refer to FL-7, "FUEL TANK" .

I

2. Drain fuel from the tank as follows:

­ Remove "fuel level sensor and fuel pump". J
­ Drain fuel from the tank using a handy pump into a fuel container.

3. Check refueling EVAP vapor cut valve for being stuck closed as follows.

Blow air into the refueling EVAP vapor cut valve (from hose end B ), and check that the air flows freely into

the tank.

K

4. Check EVAP vapor cut valve for being stuck open as follows.

­ Connect vacuum pump to hose ends A and B using a suitable 3-way connector.

L

­ Remove fuel level sensor unit retainer with fuel level sensor unit.

Always replace O-ring with new one.

­ Put fuel tank upside down.

M

Revision: December 2006

EC-637

2006 Sentra

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

[QR25DE]

­ Apply vacuum pressure to both hose ends A and B [-13.3 kPa (-100 mmHg, -3.94 inHg)] with fuel level sensor unit retainer remaining open and check that the pressure is applicable.

BBIA0295E
REFUELING CONTROL VALVE 1. Remove fuel filler cap. 2. Check air continuity between hose ends A and B.
Blow air into the hose end B. Air should flow freely into the fuel tank. 3. Blow air into hose end A and check there is no leakage. 4. Apply pressure to both hose ends A and B [20 kPa (150 mmHg, 5.91 inHg)] using a pressure pump and a
suitable 3-way connector. Check that there is no leakage.

Revision: December 2006

EC-638

BBIA0295E
2006 Sentra

POSITIVE CRANKCASE VENTILATION
POSITIVE CRANKCASE VENTILATION Description
SYSTEM DESCRIPTION

[QR25DE]
PFP:11810
A
UBS00JTA
EC

C

D

E

F

G

PBIB0492E

This system returns blow-by gas to the intake manifold.

The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake H

manifold. During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the

PCV valve. Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of venti-

lating air. The ventilating air is then drawn from the air inlet tubes into the crankcase. In this process the air passes through the hose connecting air inlet tubes to rocker cover. Under full-throttle condition, the manifold I

vacuum is insufficient to draw the blow-by flow through the valve. The flow goes through the hose connection

in the reverse direction.

On vehicles with an excessively high blow-by, the valve does not

J

meet the requirement. This is because some of the flow will go

through the hose connection to the air inlet tubes under all condi-

tions.

K

L

Component Inspection
PCV (POSITIVE CRANKCASE VENTILATION) VALVE
With engine running at idle, remove PCV valve from rocker cover. A properly working valve makes a hissing noise as air passes through it. A strong vacuum should be felt immediately when a finger is placed over valve inlet.

PBIB1588E

M

UBS00JTB

Revision: December 2006

EC-639

PBIB1589E
2006 Sentra

POSITIVE CRANKCASE VENTILATION
PCV VALVE VENTILATION HOSE 1. Check hoses and hose connections for leaks. 2. Disconnect all hoses and clean with compressed air. If any hose
cannot be freed of obstructions, replace.

[QR25DE]

S-ET277

Revision: December 2006

EC-640

2006 Sentra

NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)
[QR25DE]

NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS) Description

PFP:25386
A
UBS00J9G

G If the security indicator lights up with the ignition switch in

the ON position or "NATS MALFUNCTION" is displayed on

EC

"SELF-DIAG RESULTS" screen, perform self-diagnostic

results mode with CONSULT-II using NATS program card.

Refer to BL-96, "NVIS (NISSAN VEHICLE IMMOBILIZER

SYSTEM -- NATS)" .

C

G Confirm no self-diagnostic results of NVIS (NATS) is dis-

played before touching "ERASE" in "SELF-DIAG RESULTS"

mode with CONSULT-II.

D

G When replacing ECM, initialization of NVIS (NATS) system

and registration of all NVIS (NATS) ignition key IDs must be

SEF543X

carried out with CONSULT-II using NATS program card.

E

Therefore, be sure to receive all keys from vehicle owner. Regarding the procedures of NVIS

(NATS) initialization and all NVIS (NATS) ignition key ID registration, refer to CONSULT-II Operation

Manual, IVIS/NVIS.

F

G

H

I

J

K

L

M

Revision: December 2006

EC-641

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

PFP:00028

Introduction

UBS00J9H

The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actuators. The ECM also records various emission-related diagnostic information including:

Emission-related diagnostic information

Diagnostic service

Diagnostic Trouble Code (DTC)

Service $03 of SAE J1979

Freeze Frame data

Service $02 of SAE J1979

System Readiness Test (SRT) code

Service $01 of SAE J1979

1st Trip Diagnostic Trouble Code (1st Trip DTC)

Service $07 of SAE J1979

1st Trip Freeze Frame data

Test values and Test limits

Service $06 of SAE J1979

Calibration ID

Service $09 of SAE J1979

The above information can be checked using procedures listed in the table below.
×: Applicable --: Not applicable

DTC

1st trip DTC

Freeze Frame data

1st trip Freeze Frame data

SRT code

SRT status

Test value

CONSULT-II

×

×

×

×

×

×

--

GST

×

×

×

--

×

×

×

ECM

×

×*

--

--

--

×

--

*: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.

The malfunction indicator lamp (MIL) on the instrument panel lights up when the same malfunction is detected in two consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to EC-685 .)

Two Trip Detection Logic

UBS00J9I

When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in the ECM memory. The MIL will not light up at this stage. <1st trip> If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in the ECM memory, and the MIL lights up. The MIL lights up at the same time when the DTC is stored. <2nd trip> The "trip" in the "Two Trip Detection Logic" means a driving mode in which self-diagnosis is performed during vehicle operation. Specific on board diagnostic items will cause the ECM to light up or blink the MIL, and store DTC and Freeze Frame data, even in the 1st trip, as shown below.
×: Applicable --: Not applicable

MIL

DTC

1st trip DTC

Items

1st trip

Blinking

Lighting up

2nd trip

Blinking

Lighting up

1st trip 2nd trip 1st trip displaying displaying displaying

2nd trip display-
ing

Misfire (Possible three way cata-

lyst damage) -- DTC: P0300 -

×

--

--

--

--

--

×

--

P0304 is being detected

Misfire (Possible three way cata-

lyst damage) -- DTC: P0300 -

--

--

×

--

--

×

--

--

P0304 is being detected

One trip detection diagnoses

(Refer to EC-643, "EMISSIONRELATED DIAGNOSTIC INFOR-

--

×

--

--

×

--

--

--

MATION ITEMS" .)

Except above

--

--

--

×

--

×

×

--

When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when there is malfunction on engine control system.

Revision: December 2006

EC-642

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as

NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means A

of operating fail-safe function.

The fail-safe function also operates when above diagnoses except MIL circuit are detected, and demands the

driver to repair the malfunction.

EC

Engine operating condition in fail-safe mode

Engine speed will not rise more than 2,500 rpm due to the fuel cut

Emission-related Diagnostic Information
EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS

UBS00J9J
C
×: Applicable --: Not applicable

Items (CONSULT-II screen terms)

DTC*1

CONSULT-II GST*2

ECM*3

CAN COMM CIRCUIT

U1000

1000*4

SRT code

Test value/ Test limit (GST only)

--

--

Trip
1 (A/T) 2 (M/T)

MIL light- Reference D

ing up

page

× (A/T) -- (M/T)

EC-743

E

CAN COMM CIRCUIT CONTROL UNIT(CAN)

U1001

1001*4

--

U1010

1010

--

--

2

--

EC-743

--

1 (A/T) 2 (M/T)

× (A/T) -- (M/T)

EC-743

F

NO DTC IS DETECTED.

FURTHER TESTING

P0000

0000

--

--

MAY BE REQUIRED.

INT/V TIM CONT-B1

P0011

0011

--

--

A/F SEN1 HTR (B1)

P0031

0031

--

×

A/F SEN1 HTR (B1)

P0032

0032

--

×

HO2S2 HTR (B1)

P0037

0037

--

×

HO2S2 HTR (B1)

P0038

0038

--

×

INT/V TIM V/CIR-B1

P0075

0075

--

--

MAF SEN/CIRCUIT

P0101

0101

--

--

MAF SEN/CIRCUIT

P0102

0102

--

--

MAF SEN/CIRCUIT

P0103

0103

--

--

IAT SEN/CIRCUIT

P0112

0112

--

--

IAT SEN/CIRCUIT

P0113

0113

--

--

ECT SEN/CIRC

P0117

0117

--

--

ECT SEN/CIRC

P0118

0118

--

--

TP SEN 2/CIRC

P0122

0122

--

--

TP SEN 2/CIRC

P0123

0123

--

--

ECT SENSOR

P0125

0125

--

--

IAT SENSOR

P0127

0127

--

--

THERMSTAT FNCTN

P0128

0128

--

--

A/F SENSOR

P0130

0130

--

×

A/F SENSOR

P0131

0131

--

×

A/F SENSOR

P0132

0132

--

×

A/F SENSOR

P0133

0133

×

×

HO2S2 (B1)

P0137

0137

×

×

HO2S2 (B1)

P0138

0138

×

×

HO2S2 (B1)

P0139

0139

×

×

FUEL SYS-LEAN-B1

P0171

0171

--

--

FUEL SYS-RICH-B1

P0172

0172

--

--

FTT SENSOR

P0181

0181

--

--

--

Flashing*5 EC-656

G

2

×

EC-748

2

×

EC-752

H

2

×

EC-752

2

×

EC-757

2

×

EC-757

I

2

×

EC-763

2

×

EC-768

J

1

×

EC-777

1

×

EC-777

2

×

EC-785

K

2

×

EC-785

1

×

EC-791

L

1

×

EC-791

1

×

EC-797

1

×

EC-797

M

2

×

EC-804

2

×

EC-807

2

×

EC-810

2

×

EC-812

2

×

EC-819

2

×

EC-825

2

×

EC-831

2

×

EC-841

2

×

EC-849

2

×

EC-859

2

×

EC-867

2

×

EC-875

2

×

EC-882

Revision: December 2006

EC-643

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Items (CONSULT-II screen terms)
FTT SEN/CIRCUIT FTT SEN/CIRCUIT TP SEN 1/CIRC TP SEN 1/CIRC MULTI CYL MISFIRE CYL 1 MISFIRE CYL 2 MISFIRE CYL 3 MISFIRE CYL 4 MISFIRE KNOCK SEN/CIRC-B1 KNOCK SEN/CIRC-B1 CKP SEN/CIRCUIT CMP SEN/CIRC-B1 TW CATALYST SYS-B1 EVAP PURG FLOW/MON EVAP SMALL LEAK PURG VOLUME CONT/V PURG VOLUME CONT/V PURG VOLUME CONT/V VENT CONTROL VALVE VENT CONTROL VALVE EVAP SYS PRES SEN EVAP SYS PRES SEN EVAP SYS PRES SEN EVAP GROSS LEAK EVAP VERY SML LEAK FUEL LEV SEN SLOSH FUEL LEVEL SENSOR FUEL LEVL SEN/CIRC FUEL LEVL SEN/CIRC VEH SPEED SEN/CIRC*7 ISC SYSTEM ISC SYSTEM PW STP SEN/CIRC ECM BACK UP/CIRC ECM SENSOR POWER/CIRC PNP SW/CIRC ATF TEMP SEN/CIRC VEH SPD SEN/CIR AT*7 ENGINE SPEED SIG A/T 1ST GR FNCTN

DTC*1

CONSULT-II GST*2

ECM*3

P0182

0182

P0183

0183

P0222

0222

P0223

0223

P0300

0300

P0301

0301

P0302

0302

P0303

0303

P0304

0304

P0327

0327

P0328 P0335

0328 0335

P0340 P0420

0340 0420

P0441

0441

P0442

0442

P0443

0443

P0444

0444

P0445

0445

P0447

0447

P0448

0448

P0451

0451

P0452

0452

P0453

0453

P0455

0455

P0456

0456

P0460

0460

P0461 P0462

0461 0462

P0463

0463

P0500

0500

P0506

0506

P0507 P0550

0507 0550

P0603

0603

P0605

0605

P0643

0643

P0705

0705

P0710

0710

P0720

0720

P0725

0725

P0731

0731

SRT code

Test value/ Test limit (GST only)

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

×

×

×

×

×

×

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

×*6

×

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

Revision: December 2006

EC-644

Trip
2 2 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1 or 2 1 2 2 2 2 2

[QR25DE]

MIL light- Reference

ing up

page

× × × × × × × × × -- -- × × × × × × × × × × × × × × × × × × × × × × -- × -- or × × × × × × ×

EC-887 EC-887 EC-891 EC-891 EC-898 EC-898 EC-898 EC-898 EC-898 EC-905 EC-905 EC-910 EC-917 EC-924 EC-929 EC-935 EC-944 EC-952 EC-952 EC-959 EC-966 EC-973 EC-976 EC-983 EC-991 EC-999 EC-1009 EC-1011 EC-1013 EC-1013 EC-1015 EC-1017 EC-1019 EC-1021 EC-1026 EC-1030 EC-1033 AT-486 AT-492 AT-498 AT-503 AT-507

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

Items (CONSULT-II screen terms)

DTC*1

CONSULT-II GST*2

ECM*3

SRT code

Test value/ Test limit (GST only)

Trip

MIL light- Reference A

ing up

page

A/T 2ND GR FNCTN A/T 3RD GR FNCTN

P0732

0732

--

--

2

P0733

0733

--

--

2

×

AT-512 EC

×

AT-517

A/T 4TH GR FNCTN

P0734

0734

--

--

2

×

AT-522

TCC SOLENOID/CIRC

P0740

0740

--

--

2

×

AT-529

C

A/T TCC S/V FNCTN

P0744

0744

--

--

2

×

AT-534

L/PRESS SOL/CIRC SFT SOL A/CIRC

P0745

0745

--

--

2

P0750

0750

--

--

1

×

AT-542

D

×

AT-548

SFT SOL B/CIRC

P0755

0755

--

--

1

×

AT-553

P-N POS SW/CIRCUIT

P0850

0850

--

--

2

×

EC-1038

E

CLOSED LOOP-B1

P1148

1148

--

--

1

×

EC-1042

ENG OVER TEMP CTP LEARNING

P1217

1217

--

--

1

×

EC-1043

F

P1225

1225

--

--

2

--

EC-1056

CTP LEARNING

P1226

1226

--

--

2

--

EC-1058

ASCD SW ASCD BRAKE SW

P1564

1564

--

--

1

--

EC-1060

G

P1572

1572

--

--

1

--

EC-1067

ASCD VHL SPD SEN

P1574

1574

--

--

1

--

EC-1078

TP SEN/CIRC A/T

H

P1705

1705

--

--

1

×

AT-558

O/R CLTCH SOL/CIRC

P1760

1760

--

--

2

×

AT-563

VIAS S/V CIRC

P1800

1800

--

--

2

--

EC-1080

I

BRAKE SW/CIRCUIT

P1805

1805

--

--

2

--

EC-1085

ETC MOT PWR

P2100

2100

--

--

1

×

EC-1090

ETC FUNCTION/CIRC

P2101

2101

--

--

1

×

EC-1096

J

ETC MOT PWR ETC MOT ETC ACTR APP SEN 1/CIRC APP SEN 1/CIRC

P2103

2103

--

--

1

×

EC-1090

P2118

2118

--

--

1

×

EC-1103

K

P2119

2119

--

--

1

×

EC-1108

P2122

2122

--

--

1

×

EC-1110

P2123

2123

--

--

1

×

EC-1110

L

APP SEN 2/CIRC

P2127

2127

--

--

1

×

EC-1117

APP SEN 2/CIRC TP SENSOR

P2128

2128

--

--

1

×

EC-1117

M

P2135

2135

--

--

1

×

EC-1125

APP SENSOR

P2138

2138

--

--

1

×

EC-1132

A/F SENSOR

P2A00

2A00

--

×

2

×

EC-1140

*1: 1st trip DTC No. is the same as DTC No. *2: This number is prescribed by SAE J2012. *3: In Diagnostic Test Mode II (Self-diagnostic results), this number is controlled by NISSAN. *4: The troubleshooting for this DTC needs CONSULT-II. *5: When the ECM in the mode of displaying SRT status, MIL may flash. For the details, refer to EC-650, "How to Display SRT Status" . *6: SRT code will not be set if the self-diagnostic result is NG. *7: When the fail-safe operations for both self-diagnoses occur at the same time, the MIL illuminates.

DTC AND 1ST TRIP DTC
The 1st trip DTC (whose number is the same as the DTC number) is displayed for the latest self-diagnostic result obtained. If the ECM memory was cleared previously, and the 1st trip DTC did not reoccur, the 1st trip DTC will not be displayed. If a malfunction is detected during the 1st trip, the 1st trip DTC is stored in the ECM memory. The MIL will not light up (two trip detection logic). If the same malfunction is not detected in the 2nd trip (meeting the required

Revision: December 2006

EC-645

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

driving pattern), the 1st trip DTC is cleared from the ECM memory. If the same malfunction is detected in the 2nd trip, both the 1st trip DTC and DTC are stored in the ECM memory and the MIL lights up. In other words, the DTC is stored in the ECM memory and the MIL lights up when the same malfunction occurs in two consecutive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and 2nd trips, only the 1st trip DTC will continue to be stored. For malfunctions that blink or light up the MIL during the 1st trip, the DTC and 1st trip DTC are stored in the ECM memory. Procedures for clearing the DTC and the 1st trip DTC from the ECM memory are described in EC-653, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" . For malfunctions in which 1st trip DTCs are displayed, refer to EC-643, "EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS" . These items are required by legal regulations to continuously monitor the system/ component. In addition, the items monitored non-continuously are also displayed on CONSULT-II. 1st trip DTC is specified in Service $07 of SAE J1979. 1st trip DTC detection occurs without lighting up the MIL and therefore does not warn the driver of a malfunction. However, 1st trip DTC detection will not prevent the vehicle from being tested, for example during Inspection/Maintenance (I/M) tests. When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame data as specified in Work Flow procedure Step 2, refer to EC-678, "WORK FLOW" . Then perform DTC Confirmation Procedure or Overall Function Check to try to duplicate the malfunction. If the malfunction is duplicated, the item requires repair.

How to Read DTC and 1st Trip DTC
DTC and 1st trip DTC can be read by the following methods.
WITH CONSULT-II WITH GST CONSULT-II or GST (Generic Scan Tool) Examples: P0340, P0850, P1148, etc. These DTCs are prescribed by SAE J2012. (CONSULT-II also displays the malfunctioning component or system.) NO TOOLS The number of blinks of the MIL in the Diagnostic Test Mode II (Self-Diagnostic Results) indicates the DTC. Example: 0340, 0850, 1148, etc. These DTCs are controlled by NISSAN.
G 1st trip DTC No. is the same as DTC No.
G Output of a DTC indicates a malfunction. However, GST or the Diagnostic Test Mode II do not indicate whether the malfunction is still occurring or has occurred in the past and has returned to normal. CONSULT-II can identify malfunction status as shown below. Therefore, using CONSULT-II (if available) is recommended.
A sample of CONSULT-II display for DTC and 1st trip DTC is shown below. DTC or 1st trip DTC of a malfunction is displayed in SELF-DIAGNOSTIC RESULTS mode of CONSULT-II. Time data indicates how many times the vehicle was driven after the last detection of a DTC. If the DTC is being detected currently, the time data will be 0. If a 1st trip DTC is stored in the ECM, the time data will be [1t].

PBIB0911E
FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA
The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant temperature, short term fuel trim, long term fuel trim, engine speed, vehicle speed, base fuel schedule and intake air temperature at the moment a malfunction is detected. Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data. The data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT-II or GST. The 1st trip freeze frame data can only be displayed on the CONSULT-II screen, not on the GST. For details, see EC-646, "FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA" .

Revision: December 2006

EC-646

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the

ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority A

for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once

freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no

longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the following priorities to update the data.

EC

Priority

Items

1

Freeze frame data

Misfire -- DTC: P0300 - P0304 Fuel Injection System Function -- DTC: P0171, P0172

C

2

Except the above items (Includes A/T related items)

3

1st trip freeze frame data

D

For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was stored in the 2nd trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated from the EGR malfunction to the misfire. The 1st trip freeze frame data is updated each time a different mal- E function is detected. There is no priority for 1st trip freeze frame data. However, once freeze frame data is stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or 1st trip freeze frame data can be stored in the ECM). If freeze frame data is stored in the ECM memory and freeze F frame data with the same priority occurs later, the first (original) freeze frame data remains unchanged in the ECM memory. Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM memory is erased. Procedures for clearing the ECM memory are described in EC-643, "EMISSION-RELATED G DIAGNOSTIC INFORMATION ITEMS" .

SYSTEM READINESS TEST (SRT) CODE
H System Readiness Test (SRT) code is specified in Service $01 of SAE J1979.

As part of an enhanced emissions test for Inspection & Maintenance (I/M), certain states require the status of

SRT be used to indicate whether the ECM has completed self-diagnosis of major emission systems and com-

ponents. Completion must be verified in order for the emissions inspection to proceed.

I

If a vehicle is rejected for a State emissions inspection due to one or more SRT items indicating "INCMP", use

the information in this Service Manual to set the SRT to "CMPLT".

In most cases the ECM will automatically complete its self-diagnosis cycle during normal usage, and the SRT J status will indicate "CMPLT" for each application system. Once set as "CMPLT", the SRT status remains

"CMPLT" until the self-diagnosis memory is erased.

Occasionally, certain portions of the self-diagnostic test may not be completed as a result of the customer's

normal driving pattern; the SRT will indicate "INCMP" for these items.

K

NOTE:

The SRT will also indicate "INCMP" if the self-diagnosis memory is erased for any reason or if the ECM mem-

ory power supply is interrupted for several hours.

L

If, during the state emissions inspection, the SRT indicates "CMPLT" for all test items, the inspector will con-

tinue with the emissions test. However, if the SRT indicates "INCMP" for one or more of the SRT items the

vehicle is returned to the customer untested.

M

NOTE:

If MIL is ON during the state emissions inspection, the vehicle is also returned to the customer untested even

though the SRT indicates "CMPLT" for all test items. Therefore, it is important to check SRT ("CMPLT") and

DTC (No DTCs) before the inspection.

SRT Item The table below shows required self-diagnostic items to set the SRT to "CMPLT".

SRT item (CONSULT-II indication)
CATALYST EVAP SYSTEM

Performance Priority*
2
2
1
2

Required self-diagnostic items to set the SRT to "CMPLT"
Three way catalyst function EVAP control system purge flow monitoring EVAP control system EVAP control system

Corresponding DTC No.
P0420 P0441 P0442 P0456

Revision: December 2006

EC-647

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

SRT item (CONSULT-II indication)

Performance Priority*

Required self-diagnostic items to set the SRT to "CMPLT"

Corresponding DTC No.

HO2S

2

Air fuel ratio (A/F) sensor 1

P0133

Heated oxygen sensor 2

P0137

Heated oxygen sensor 2

P0138

Heated oxygen sensor 2

P0139

*: If completion of several SRTs is required, perform driving patterns (DTC confirmation procedure), one by one based on the priority for models with CONSULT-II.

SRT Set Timing
SRT is set as "CMPLT" after self-diagnosis has been performed one or more times. Completion of SRT is done regardless of whether the result is OK or NG. The set timing is different between OK and NG results and is shown in the table below.

Self-diagnosis result

All OK

Case 1

Case 2

NG exists

Case 3

Diagnosis
P0400 P0402 P1402 SRT of EGR P0400 P0402 P1402 SRT of EGR P0400 P0402
P1402
(1st trip) DTC

Example

Ignition cycle  ON  OFF  ON  OFF  ON  OFF  ON 

OK (1)

-- (1)

OK (2)

-- (2)

OK (1)

-- (1)

-- (1)

OK (2)

OK (1)

OK (2)

-- (2)

-- (2)

"CMPLT"

"CMPLT"

"CMPLT"

"CMPLT"

OK (1)

-- (1)

-- (1)

-- (1)

-- (0)

-- (0)

OK (1)

-- (1)

OK (1)

OK (2)

-- (2)

-- (2)

"INCMP"

"INCMP"

"CMPLT"

"CMPLT"

OK

OK

--

--

--

--

--

--

NG

NG

--

NG

(Consecutive

NG)

1st trip DTC

--

1st trip DTC

DTC (= MIL "ON")

SRT of EGR
OK: Self-diagnosis is carried out and the result is OK. NG: Self-diagnosis is carried out and the result is NG. --: Self-diagnosis is not carried out.

"INCMP"

"INCMP"

"INCMP"

"CMPLT"

When all SRT related self-diagnoses showed OK results in a single cycle (Ignition OFF-ON-OFF), the SRT will indicate "CMPLT".  Case 1 above When all SRT related self-diagnoses showed OK results through several different cycles, the SRT will indicate "CMPLT" at the time the respective self-diagnoses have at least one OK result.  Case 2 above If one or more SRT related self-diagnoses showed NG results in 2 consecutive cycles, the SRT will also indicate "CMPLT".  Case 3 above The table above shows that the minimum number of cycles for setting SRT as "INCMP" is one (1) for each self-diagnosis (Case 1 & 2) or two (2) for one of self-diagnoses (Case 3). However, in preparation for the state emissions inspection, it is unnecessary for each self-diagnosis to be executed twice (Case 3) for the following reasons:
G The SRT will indicate "CMPLT" at the time the respective self-diagnoses have one (1) OK result.
G The emissions inspection requires "CMPLT" of the SRT only with OK self-diagnosis results.
G When, during SRT driving pattern, 1st trip DTC (NG) is detected prior to "CMPLT" of SRT, the self-diagnosis memory must be erased from ECM after repair.
G If the 1st trip DTC is erased, all the SRT will indicate "INCMP".

Revision: December 2006

EC-648

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

NOTE:
SRT can be set as "CMPLT" together with the DTC(s). Therefore, DTC check must always be carried out A prior to the state emission inspection even though the SRT indicates "CMPLT".

SRT Service Procedure If a vehicle has failed the state emissions inspection due to one or more SRT items indicating "INCMP", review EC the flowchart diagnostic sequence on the next page.

C

D

E

F

G

H

I

J

K

L

M

*1 EC-646

*2 EC-650

*3 EC-650

PBIB2320E

Revision: December 2006

EC-649

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM
How to Display SRT Status
WITH CONSULT-II Selecting "SRT STATUS" in "DTC CONFIRMATION" mode with CONSULT-II. For items whose SRT codes are set, a "CMPLT" is displayed on the CONSULT-II screen; for items whose SRT codes are not set, "INCMP" is displayed. A sample of CONSULT-II display for SRT code is shown at right. "INCMP" means the self-diagnosis is incomplete and SRT is not set. "CMPLT" means the self-diagnosis is complete and SRT is set. NOTE: Though displayed on the CONSULT-II screen, "HO2S HTR" is not SRT item.
WITH GST Selecting Service $01 with GST (Generic Scan Tool).
NO TOOLS A SRT code itself can not be displayed while only SRT status can be. 1. Turn ignition switch ON and wait 20 seconds. 2. SRT status is indicated as shown below.
G When all SRT codes are set, MIL lights up continuously. G When any SRT codes are not set, MIL will flash periodically for 10 seconds.

[QR25DE]
SEF949Z

PBIB2317E
How to Set SRT Code
To set all SRT codes, self-diagnosis for the items indicated above must be performed one or more times. Each diagnosis may require a long period of actual driving under various conditions.
WITH CONSULT-II Perform corresponding DTC Confirmation Procedure one by one based on Performance Priority in the table on EC-647, "SRT Item" .
WITHOUT CONSULT-II The most efficient driving pattern in which SRT codes can be properly set is explained on the next page. The driving pattern should be performed one or more times to set all SRT codes.

Revision: December 2006

EC-650

2006 Sentra

Driving Pattern

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-651

PBIB2906E
2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

G The time required for each diagnosis varies with road surface conditions, weather, altitude, individual driving habits, etc. Zone A refers to the range where the time, required for the diagnosis under normal conditions*, is the shortest. Zone B refers to the range where the diagnosis can still be performed if the diagnosis is not completed within zone A.

*: Normal conditions refer to the following:

G Sea level

G Flat road

G Ambient air temperature: 20 - 30°C (68 - 86°F)

G Diagnosis is performed as quickly as possible under normal conditions. Under different conditions [For example: ambient air temperature other than 20 - 30°C (68 - 86°F)], diagnosis may also be performed.

Pattern 1:

G The engine is started at the engine coolant temperature of -10 to 35°C (14 to 95°F) (where the voltage between the ECM terminal 73 and ground is 3.0 - 4.3V).

G The engine must be operated at idle speed until the engine coolant temperature is greater than 70°C (158°F) (where the voltage between the ECM terminal 73 and ground is lower than 1.4V).

G The engine is started at the fuel tank temperature of warmer than 0°C (32°F) (where the voltage between the ECM terminal 107 and ground is less than 4.1V).

Pattern 2:

G When steady-state driving is performed again even after it is interrupted, each diagnosis can be conducted. In this case, the time required for diagnosis may be extended.

Pattern 3:

G Operate vehicle following the driving pattern shown in the figure.

G Release the accelerator pedal during decelerating vehicle speed from 90 km/h (56 MPH) to 0 km/h (0 MPH).

Pattern 4:

G The accelerator pedal must be held very steady during steadystate driving.

G If the accelerator pedal is moved, the test must be conducted all over again.

*1: Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH), then release the accelerator pedal and keep it released for more than 10 seconds. Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH) again. *2: Checking the vehicle speed with GST is advised.

PBIB2244E

Suggested Transmission Gear Position for A/T Models Set the selector lever in the D position with the overdrive switch turned ON. Suggested upshift speeds for M/T models Shown below are suggested vehicle speeds for shifting into a higher gear. These suggestions relate to fuel economy and vehicle performance. Actual upshift speeds will vary according to road conditions, the weather and individual driving habits.

For normal acceleration in low altitude areas
[less than 1,219 m (4,000 ft)]:

For quick acceleration in low altitude areas

For high attitude areas [over 1,219m (4,000 ft)]:

Gear change

ACCEL shift point km/h (MPH)

km/h (MPH)

km/h (MPH)

1st to 2nd

16 (10)

26 (16)

24 (15)

2nd to 3rd

23 (14)

42 (26)

40 (25)

3rd to 4th

40 (25)

55 (34)

64 (40)

4th to 5th

60 (37)

66 (41)

72 (45)

5th to 6th

72 (45)

72 (45)

80 (50)

Revision: December 2006

EC-652

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

Suggested Maximum Speed in Each Gear

Downshift to a lower gear if the engine is not running smoothly, or if you need to accelerate.

A

Do not exceed the maximum suggested speed (shown below) in any gear. For level road driving, use the high-

est gear suggested for that speed. Always observe posted speed limits and drive according to the road condi-

tions to ensure safe operation. Do not over-rev the engine when shifting to a lower gear as it may cause engine damage or loss of vehicle control.

EC

Gear

km/h (MPH)

1st

45 (25)

C

2nd

80 (50)

3rd

130 (80)

4th

--

D

5th

--

6th

--

E

TEST VALUE AND TEST LIMIT (GST ONLY -- NOT APPLICABLE TO CONSULT-II)

The following is the information specified in Service $06 of SAE J1979. The test value is a parameter used to determine whether a system/circuit diagnostic test is "OK" or "NG" while F being monitored by the ECM during self-diagnosis. The test limit is a reference value which is specified as the maximum or minimum value and is compared with the test value being monitored. These data (test value and test limit) are specified by Test ID (TID) and Component ID (CID) and can be dis- G played on the GST screen.

Test value (GST display)

Item

Self-diagnostic test item

DTC

Test limit Conversion

TID

CID

H

P0420

01H

01H

Max.

1/128

CATALYST

Three way catalyst function

P0420

02H

81H

Min.

1

I

EVAP control system (Small leak)

P0442

05H

03H

Max.

1/128 mm2

EVAP SYSTEM

EVAP control system purge flow monitoring P0441

06H

83H

Min.

20 mV

EVAP control system (Very small leak) P0456

07H

03H

Max.

1/128 mm2

J

P0131

41H

8EH

Min.

5 mV

P0132

42H

0EH

Max.

5 mV

K

P2A00

43H

0EH

Max.

0.002

A/F sensor 1

P2A00

44H

8EH

Min.

0.002

P0133

45H

8EH

Min.

0.002

L

HO2S

P0130

46H

0EH

Max.

5 mV

P0130

47H

8EH

Min.

5 mV

M

P0133

48H

8EH

Min.

0.002

P0139

19H

86H

Min.

10mV/500 ms

Heated oxygen sensor 2

P0137 P0138

1AH

86H

Min.

1BH

06H

Max.

10 mV 10 mV

P0138

1CH

06H

Max.

10 mV

HO2S HEATER

A/F sensor 1 heater Heated oxygen sensor 2 heater

P0032 P0031 P0038 P0037

57H 58H 2DH 2EH

10H 90H 0AH 8AH

Max. Min. Max. Min.

5 mV 5 mV 20 mV 20 mV

HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION How to Erase DTC
With CONSULT-II The emission related diagnostic information in the ECM can be erased by selecting "ERASE" in the "SELFDIAG RESULTS" mode with CONSULT-II.

Revision: December 2006

EC-653

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

If DTCs are displayed for both ECM and TCM (Transmission control module), they need to be erased individually from the ECM and TCM (Transmission control module).
NOTE: If the DTC is not for A/T related items (see EC-605, "INDEX FOR DTC" ), skip steps 2 through 4. 1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10
seconds and then turn it ON (engine stopped) again. 2. Turn CONSULT-II ON and touch "A/T".
3. Touch "SELF-DIAG RESULTS". 4. Touch "ERASE". [The DTC in the TCM (Transmission control module) will be erased.] Then touch "BACK"
twice. 5. Touch "ENGINE".
6. Touch "SELF-DIAG RESULTS". 7. Touch "ERASE". (The DTC in the ECM will be erased.)

SCIA5334E
With GST The emission related diagnostic information in the ECM can be erased by selecting Service $04 with GST. NOTE: If the DTC is not for A/T related items (see EC-605, "INDEX FOR DTC" ), skip step 2. 1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once.
Wait at least 10 seconds and then turn it ON (engine stopped) again. 2. Perform AT-428, "HOW TO ERASE DTC (WITH GST)" . (The DTC in the TCM will be erased.) 3. Select Service $04 with GST (Generic Scan Tool).
No Tools NOTE: If the DTC is not for A/T related items (see EC-605, "INDEX FOR DTC" ), skip step 2.

Revision: December 2006

EC-654

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once.

Wait at least 10 seconds and then turn it ON (engine stopped) again.

A

2. Perform AT-428, "HOW TO ERASE DTC (NO TOOLS)" . (The DTC in the TCM will be erased.)

3. Change the diagnostic test mode from Mode II to Mode I by depressing the accelerator pedal. Refer to

EC-656, "HOW TO SWITCH DIAGNOSTIC TEST MODE" .

EC

G If the battery is disconnected, the emission-related diagnostic information will be lost within 24 hours.

G The following data are cleared when the ECM memory is erased.

C

­ Diagnostic trouble codes

­ 1st trip diagnostic trouble codes

­ Freeze frame data

D

­ 1st trip freeze frame data

­ System readiness test (SRT) codes

E

­ Test values

Actual work procedures are explained using a DTC as an example. Be careful so that not only the DTC, but all

of the data listed above, are cleared from the ECM memory during work procedures.

F

Malfunction Indicator Lamp (MIL)

UBS00J9K

DESCRIPTION

The MIL is located on the instrument panel.

G

1. The MIL will light up when the ignition switch is turned ON with-

out the engine running. This is a bulb check.

If the MIL does not light up, refer to DI-27, "WARNING LAMPS" ,

H

or see EC-1210, "MIL AND DATA LINK CONNECTOR" .

2. When the engine is started, the MIL should go off.

If the MIL remains on, the on board diagnostic system has

I

detected an engine system malfunction.

SEF217U

J

K

L

M

Revision: December 2006

EC-655

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

ON BOARD DIAGNOSTIC SYSTEM FUNCTION The on board diagnostic system has the following three functions.

Diagnostic Test Mode

KEY and ENG. Status

Function

Explanation of Function

Mode I

Ignition switch in BULB CHECK ON position

This function checks the MIL bulb for damage (blown, open circuit, etc.). If the MIL does not come on, check MIL circuit.

Engine stopped

Engine running

MALFUNCTION WARNING

Mode II

Ignition switch in SELF-DIAGNOSTIC

ON position

RESULTS

Engine stopped

This is a usual driving condition. When a malfunction is detected twice in two consecutive driving cycles (two trip detection logic), the MIL will light up to inform the driver that a malfunction has been detected. The following malfunctions will light up or blink the MIL in the 1st trip.
G Misfire (Possible three way catalyst damage)
G One trip detection diagnoses
This function allows DTCs and 1st trip DTCs to be read.

When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when there is malfunction on engine control system. Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means of operating fail-safe function. The fail-safe function also operates when above diagnoses except MIL circuit are detected, and demands the driver to repair the malfunction.

Engine operating condition in fail-safe mode

Engine speed will not rise more than 2,500 rpm due to the fuel cut

MIL Flashing Without DTC When any SRT codes are not set, MIL may flash without DTC. For the details, refer to EC-650, "How to Display SRT Status"
HOW TO SWITCH DIAGNOSTIC TEST MODE NOTE: G It is better to count the time accurately with a clock. G It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit
has a malfunction. G Always ECM returns to Diagnostic Test Mode I after ignition switch is turned OFF.
How to Set Diagnostic Test Mode II (Self-diagnostic Results) 1. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds. 2. Repeat the following procedure quickly five times within 5 seconds. a. Fully depress the accelerator pedal. b. Fully release the accelerator pedal. 3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the MIL starts
blinking.

Revision: December 2006

EC-656

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

NOTE: Do not release the accelerator pedal for 10 seconds if MIL may start blinking on the halfway of this A 10 seconds. This blinking is displaying SRT status and is continued for another 10 seconds. For the details, refer to EC-650, "How to Display SRT Status" .

4. Fully release the accelerator pedal.

EC

ECM has entered to Diagnostic Test Mode II (Self-diagnostic results).

NOTE:

Wait until the same DTC (or 1st trip DTC) appears to confirm all DTCs certainly.

C

D

E

F
PBIB0092E

How to Erase Diagnostic Test Mode II (Self-diagnostic Results)

1. Set ECM in Diagnostic Test Mode II (Self-diagnostic results). Refer to EC-656, "How to Set Diagnostic G Test Mode II (Self-diagnostic Results)" .

2. Fully depress the accelerator pedal and keep it for more than 10 seconds.

The emission-related diagnostic information has been erased from the backup memory in the ECM.

H

3. Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.

DIAGNOSTIC TEST MODE I -- BULB CHECK In this mode, the MIL on the instrument panel should stay ON. If it remains OFF, check the bulb. Refer to DI- I
27, "WARNING LAMPS" .

DIAGNOSTIC TEST MODE I -- MALFUNCTION WARNING

J

MIL

Condition

ON

When the malfunction is detected.

OFF

No malfunction

K

These DTC numbers are clarified in Diagnostic Test Mode II (SELF-DIAGNOSTIC RESULTS)

DIAGNOSTIC TEST MODE II -- SELF-DIAGNOSTIC RESULTS

L

In this mode, the DTC and 1st trip DTC are indicated by the number of blinks of the MIL as shown below.

The DTC and 1st trip DTC are displayed at the same time. If the MIL does not illuminate in diagnostic test

mode I (Malfunction warning), all displayed items are 1st trip DTCs. If only one code is displayed when the MIL M illuminates in diagnostic test mode II (SELF-DIAGNOSTIC RESULTS), it is a DTC; if two or more codes are

displayed, they may be either DTCs or 1st trip DTCs. DTC No. is same as that of 1st trip DTC. These uniden-

tified codes can be identified by using the CONSULT-II or GST. A DTC will be used as an example for how to

read a code.

Revision: December 2006

EC-657

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

PBIB3005E
A particular trouble code can be identified by the number of four-digit numeral flashes. The "zero" is indicated by the number of ten flashes. The "A" is indicated by the number of eleven flash. The length of time the 1,000th-digit numeral flashes on and off is 1.2 seconds consisting of an ON (0.6-second) - OFF (0.6-second) cycle. The 100th-digit numeral and lower digit numerals consist of a 0.3-second ON and 0.3-second OFF cycle. A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later numeral appears on the display 1.3 seconds after the former numeral has disappeared. A change from one trouble code to another occurs at an interval of 1.8-second OFF. In this way, all the detected malfunctions are classified by their DTC numbers. The DTC 0000 refers to no malfunction. (See EC-605, "INDEX FOR DTC" )

How to Erase Diagnostic Test Mode II (Self-diagnostic Results) The DTC can be erased from the back-up memory in the ECM by depressing accelerator pedal. Refer to EC657, "How to Erase Diagnostic Test Mode II (Self-diagnostic Results)" . G If the battery is disconnected, the DTC will be lost from the backup memory within 24 hours. G Be careful not to erase the stored memory before starting trouble diagnoses.

OBD System Operation Chart
RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS

UBS00J9L

G When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are stored in the ECM memory.

G When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are stored in the ECM memory, and the MIL will come on. For details, refer to EC-642, "Two Trip Detection Logic" .

G The MIL will go off after the vehicle is driven 3 times (driving pattern B) with no malfunction. The drive is counted only when the recorded driving pattern is met (as stored in the ECM). If another malfunction occurs while counting, the counter will reset.

Revision: December 2006

EC-658

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

G The DTC and the freeze frame data will be stored until the vehicle is driven 40 times (driving pattern A)

without the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and A

Fuel Injection System, the DTC and freeze frame data will be stored until the vehicle is driven 80 times

(driving pattern C) without the same malfunction recurring. The "TIME" in "SELF-DIAGNOSTIC

RESULTS" mode of CONSULT-II will count the number of times the vehicle is driven.

EC

G The 1st trip DTC is not displayed when the self-diagnosis results in OK for the 2nd trip.

SUMMARY CHART
Items

Fuel Injection System

Misfire

Other

C

MIL (goes off)

3 (pattern B)

3 (pattern B)

3 (pattern B)

DTC, Freeze Frame Data (no display)

80 (pattern C)

80 (pattern C)

40 (pattern A)

D

1st Trip DTC (clear)

1 (pattern C), *1

1 (pattern C), *1

1 (pattern B)

1st Trip Freeze Frame Data (clear)

*1, *2

*1, *2

1 (pattern B)

E

For details about patterns B and C under "Fuel Injection System" and "Misfire", see EC-661 .

For details about patterns A and B under "Other", see EC-663 .

*1: Clear timing is at the moment OK is detected.

F

*2: Clear timing is when the same malfunction is detected in the 2nd trip.

G

H

I

J

K

L

M

Revision: December 2006

EC-659

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

RELATIONSHIP BETWEEN MIL, DTC, 1ST TRIP DTC AND DRIVING PATTERNS FOR "MISFIRE <EXHAUST QUALITY DETERIORATION>", "FUEL INJECTION SYSTEM"

*1: When the same malfunction is detected in two consecutive trips, MIL will light up.

*2: MIL will go off after vehicle is driven 3 times (pattern B) without any malfunctions.

*4: The DTC and the freeze frame data *5: When a malfunction is detected for

will not be displayed any longer after

the first time, the 1st trip DTC and

vehicle is driven 80 times (pattern C)

the 1st trip freeze frame data will be

without the same malfunction. (The

stored in ECM.

DTC and the freeze frame data still

remain in ECM.)

*7: When the same malfunction is detected in the 2nd trip, the 1st trip freeze frame data will be cleared.

*8: 1st trip DTC will be cleared when vehicle is driven once (pattern C) without the same malfunction after DTC is stored in ECM.

SEF392S
*3: When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data will be stored in ECM.
*6: The 1st trip DTC and the 1st trip freeze frame data will be cleared at the moment OK is detected.

Revision: December 2006

EC-660

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

EXPLANATION FOR DRIVING PATTERNS FOR "MISFIRE <EXHAUST QUALITY DETERIORA-

TION>", "FUEL INJECTION SYSTEM"

A

<Driving Pattern B>

Driving pattern B means the vehicle operation as follows:

All components and systems should be monitored at least once by the OBD system.

EC

G The B counter will be cleared when the malfunction is detected once regardless of the driving pattern.

G The B counter will be counted up when driving pattern B is satisfied without any malfunction.

G The MIL will go off when the B counter reaches 3. (*2 in "OBD SYSTEM OPERATION CHART")

C

<Driving Pattern C>

Driving pattern C means the vehicle operation as follows:

D

The following conditions should be satisfied at the same time:

Engine speed: (Engine speed in the freeze frame data) ±375 rpm

Calculated load value: (Calculated load value in the freeze frame data) x (1±0.1) [%]

Engine coolant temperature (T) condition:

E

G When the freeze frame data shows lower than 70°C (158°F), "T" should be lower than 70°C (158°F).

G

When the freeze frame data shows higher than or equal to 70°C (158°F), "T" should be higher than or equal to 70°C (158°F).

F

Example:

If the stored freeze frame data is as follows:

Engine speed: 850 rpm, Calculated load value: 30%, Engine coolant temperature: 80°C (176°F)

G

To be satisfied with driving pattern C, the vehicle should run under the following conditions:

Engine speed: 475 - 1,225 rpm, Calculated load value: 27 - 33%, Engine coolant temperature: more than 70°C

(158°F)

H

G The C counter will be cleared when the malfunction is detected regardless of vehicle conditions above.

G The C counter will be counted up when vehicle conditions above is satisfied without the same malfunction.

G The DTC will not be displayed after C counter reaches 80. (*2 in "OBD SYSTEM OPERATION CHART") I

G The 1st trip DTC will be cleared when C counter is counted once without the same malfunction after DTC is stored in ECM. J

K

L

M

Revision: December 2006

EC-661

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

RELATIONSHIP BETWEEN MIL, DTC, 1ST TRIP DTC AND DRIVING PATTERNS EXCEPT FOR "MISFIRE <EXHAUST QUALITY DETERIORATION>", "FUEL INJECTION SYSTEM"

*1: When the same malfunction is detected in two consecutive trips, MIL will light up.

*2: MIL will go off after vehicle is driven 3 times (pattern B) without any malfunctions.

*4: The DTC and the freeze frame data *5: When a malfunction is detected for

will not be displayed any longer after

the first time, the 1st trip DTC and

vehicle is driven 40 times (pattern A)

the 1st trip freeze frame data will be

without the same malfunction.

stored in ECM.

(The DTC and the freeze frame data

still remain in ECM.)

*7: When the same malfunction is detected in the 2nd trip, the 1st trip freeze frame data will be cleared.

SEF393SD
*3: When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data will be stored in ECM.
*6: 1st trip DTC will be cleared after vehicle is driven once (pattern B) without the same malfunction.

Revision: December 2006

EC-662

2006 Sentra

ON BOARD DIAGNOSTIC (OBD) SYSTEM

[QR25DE]

EXPLANATION FOR DRIVING PATTERNS EXCEPT FOR "MISFIRE <EXHAUST QUALITY

DETERIORATION>", "FUEL INJECTION SYSTEM"

A

<Driving Pattern A>

EC

C

D

E

F

G The A counter will be cleared when the malfunction is detected regardless of (1) - (4).

G
AEC574

G The A counter will be counted up when (1) - (4) are satisfied without the same malfunction.

H

G The DTC will not be displayed after the A counter reaches 40. (*2 in "OBD SYSTEM OPERATION CHART")

<Driving Pattern B>

I

Driving pattern B means the vehicle operation as follows:

All components and systems should be monitored at least once by the OBD system.

G The B counter will be cleared when the malfunction is detected once regardless of the driving pattern.

J

G The B counter will be counted up when driving pattern B is satisfied without any malfunctions.

G The MIL will go off when the B counter reaches 3 (*2 in "OBD SYSTEM OPERATION CHART").

K

L

M

Revision: December 2006

EC-663

2006 Sentra

BASIC SERVICE PROCEDURE
BASIC SERVICE PROCEDURE Basic Inspection
1. INSPECTION START

[QR25DE]
PFP:00018
UBS00J9M

1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for scheduled maintenance.

2. Open engine hood and check the following:

­ Harness connectors for improper connections

­ Wiring harness for improper connections, pinches and cut

­ Vacuum hoses for splits, kinks and improper connections

­ Hoses and ducts for leaks

­ Air cleaner clogging

­ Gasket

3. Confirm that electrical or mechanical loads are not applied.

­ Headlamp switch is OFF. ­ Air conditioner switch is OFF.

SEF983U

­ Rear window defogger switch is OFF.

­ Steering wheel is in the straight-ahead position, etc.

4. Start engine and warm it up until engine coolant temperature indicator points the middle of gauge. Ensure engine stays below 1,000 rpm.

5. Run engine at about 2,000 rpm for about 2 minutes under noload.
6. Make sure that no DTC is displayed with CONSULT-II or GST.
OK or NG
OK >> GO TO 3. NG >> GO TO 2.

SEF976U

2. REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding Diagnostic Procedure.
>> GO TO 3.

SEF977U

Revision: December 2006

EC-664

2006 Sentra

BASIC SERVICE PROCEDURE
3. CHECK TARGET IDLE SPEED
With CONSULT-II 1. Run engine at about 2,000 rpm for about 2 minutes under no-load. 2. Rev engine (2,000 to 3,000 rpm) 2 or 3 times under no-load,
then run engine at idle speed for about 1 minute.

[QR25DE]
A EC
C

D

3. Read idle speed in "DATA MONITOR" mode with CONSULT-II. Refer to EC-669, "IDLE SPEED" .
M/T: 700 ± 50 rpm (in Neutral position) A/T: 700 ± 50 rpm (in P or N position)

E
PBIA8513J
F
G

H

Without CONSULT-II

SEF058Y
I

1. Run engine at about 2,000 rpm for about 2 minutes under no-load.

2. Rev engine (2,000 to 3,000 rpm) 2 or 3 times under no-load, then run engine at idle speed for about 1 J minute.

3. Check idle speed. Refer to EC-669, "IDLE SPEED" .

M/T: 700 ± 50 rpm (in Neutral position)

K

A/T: 700 ± 50 rpm (in P or N position)

OK or NG

L

OK >> GO TO 10.

NG >> GO TO 4.

4. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

M

1. Stop engine. 2. Perform EC-670, "Accelerator Pedal Released Position Learning" .

>> GO TO 5.
5. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform EC-671, "Throttle Valve Closed Position Learning" .

>> GO TO 6.

Revision: December 2006

EC-665

2006 Sentra

BASIC SERVICE PROCEDURE
6. PERFORM IDLE AIR VOLUME LEARNING

[QR25DE]

Refer to EC-671, "Idle Air Volume Learning" . Is Idle Air Volume Learning carried out successfully? Yes or No
Yes >> GO TO 7. No >> 1. Follow the instruction of Idle Air Volume Learning.
2. GO TO 4.
7. CHECK TARGET IDLE SPEED AGAIN

With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Read idle speed in "DATA MONITOR" mode with CONSULT-II.
Refer to EC-669, "IDLE SPEED" .
M/T: 700 ± 50 rpm (in Neutral position) A/T: 700 ± 50 rpm (in P or N position)
Without CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Check idle speed. Refer to EC-669, "IDLE SPEED" .
M/T: 700 ± 50 rpm (in Neutral position) A/T: 700 ± 50 rpm (in P or N position)
OK or NG OK >> GO TO 10. NG >> GO TO 8.
8. DETECT MALFUNCTIONING PART

SEF174Y

Check the following. G Check camshaft position sensor (PHASE) and circuit. Refer to EC-917 . G Check crankshaft position sensor (POS) and circuit. Refer to EC-910 . OK or NG
OK >> GO TO 9. NG >> 1. Repair or replace.
2. GO TO 4.
9. CHECK ECM FUNCTION

1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare case.)
2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to BL-96, "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM -- NATS)" .

>> GO TO 4.

Revision: December 2006

EC-666

2006 Sentra

BASIC SERVICE PROCEDURE
10. CHECK IGNITION TIMING
1. Run engine at idle. 2. Check ignition timing with a timing light. Refer to EC-669, "IGNI-
TION TIMING" .
M/T: 15 ± 5° BTDC (in Neutral position) A/T: 15 ± 5° BTDC (in P or N position) OK or NG OK >> GO TO 19. NG >> GO TO 11.

11. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Stop engine. 2. Perform EC-670, "Accelerator Pedal Released Position Learning" .
>> GO TO 12.
12. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform EC-671, "Throttle Valve Closed Position Learning" .
>> GO TO 13.
13. PERFORM IDLE AIR VOLUME LEARNING
Refer to EC-671, "Idle Air Volume Learning" . Is Idle Air Volume Learning carried out successfully? Yes or No
Yes >> GO TO 14. No >> 1. Follow the instruction of Idle Air Volume Learning.
2. GO TO 4.
14. CHECK TARGET IDLE SPEED AGAIN
With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Read idle speed in "DATA MONITOR" mode with CONSULT-II.
Refer to EC-669, "IDLE SPEED" .
M/T: 700 ± 50 rpm (in Neutral position) A/T: 700 ± 50 rpm (in P or N position)
Without CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Check idle speed. Refer to EC-669, "IDLE SPEED" .
M/T: 700 ± 50 rpm (in Neutral position) A/T: 700 ± 50 rpm (in P or N position) OK or NG OK >> GO TO 15. NG >> GO TO 17.

Revision: December 2006

EC-667

[QR25DE]
A EC
C D
BBIA0005E
E F G H I J K L M
SEF174Y
2006 Sentra

BASIC SERVICE PROCEDURE
15. CHECK IGNITION TIMING AGAIN
1. Run engine at idle. 2. Check ignition timing with a timing light. Refer to EC-669, "IDLE
SPEED" .
M/T: 15 ± 5° BTDC (in Neutral position) A/T: 15 ± 5° BTDC (in P or N position) OK or NG OK >> GO TO 19 NG >> GO TO 16.

[QR25DE]

16. CHECK TIMING CHAIN INSTALLATION

BBIA0005E

Check timing chain installation. Refer to EM-136, "TIMING CHAIN" . OK or NG
OK >> GO TO 17. NG >> 1. Repair the timing chain installation.
2. GO TO 4.
17. DETECT MALFUNCTIONING PART

Check the following. G Check camshaft position sensor (PHASE) and circuit. Refer to EC-917 . G Check crankshaft position sensor (POS) and circuit. Refer to EC-910 . OK or NG
OK >> GO TO 18. NG >> 1. Repair or replace.
2. GO TO 4.
18. CHECK ECM FUNCTION

1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare case.)
2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to BL-96, "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM -- NATS)" .

>> GO TO 4.
19. INSPECTION END
Did you replace ECM, referring this Basic Inspection procedure? Yes or No
Yes >> 1. Perform EC-670, "VIN Registration" . 2. INSPECTION END
No >> INSPECTION END

Revision: December 2006

EC-668

2006 Sentra

BASIC SERVICE PROCEDURE Idle Speed and Ignition Timing Check
IDLE SPEED With CONSULT-II
Check idle speed in "DATA MONITOR" mode with CONSULT-II.
With GST Check idle speed in Service $01 with GST. IGNITION TIMING Any of following two methods may be used. Method A 1. Slide the harness protector off the ignition coil No.1 to clear the
wires. 2. Attach timing light to the ignition coil No. 1 wires as shown in the
figure. 3. Check ignition timing.
Method B 1. Remove No. 1 ignition coil.

2. Connect No. 1 ignition coil and No. 1 spark plug with suitable high-tension wire as shown, and attach timing light clamp to this wire.

Revision: December 2006

EC-669

[QR25DE]
UBS00J9N
A EC
C D
SEF058Y
E F G H I J
BBIA0089E
K L M
BBIA0004E
BBIA0076E
2006 Sentra

BASIC SERVICE PROCEDURE

[QR25DE]

3. Check ignition timing.

SEF166Y

BBIA0005E

VIN Registration
DESCRIPTION

UBS00J9P

VIN Registration is an operation to registering VIN in ECM. It must be performed each time ECM is replaced.

NOTE: Accurate VIN which is registered in ECM may be required for Inspection & Maintenance (I/M).

OPERATION PROCEDURE With CONSULT-II
1. Check the VIN of the vehicle and note it. Refer to GI-46, "IDENTIFICATION INFORMATION" . 2. Turn ignition switch ON and engine stopped. 3. Select "VIN REGISTRATION" in "WORK SUPPORT" mode. 4. Follow the instruction of CONSULT-II display.

PBIB2242E

Accelerator Pedal Released Position Learning
DESCRIPTION

UBS00J9Q

Accelerator Pedal Released Position Learning is an operation to learn the fully released position of the accelerator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each time harness connector of accelerator pedal position sensor or ECM is disconnected.

OPERATION PROCEDURE 1. Make sure that accelerator pedal is fully released. 2. Turn ignition switch ON and wait at least 2 seconds. 3. Turn ignition switch OFF and wait at least 10 seconds. 4. Turn ignition switch ON and wait at least 2 seconds. 5. Turn ignition switch OFF and wait at least 10 seconds.

Revision: December 2006

EC-670

2006 Sentra

BASIC SERVICE PROCEDURE

[QR25DE]

Throttle Valve Closed Position Learning
DESCRIPTION

UBS00J9R
A

Throttle Valve Closed Position Learning is an operation to learn the fully closed position of the throttle valve by

monitoring the throttle position sensor output signal. It must be performed each time harness connector of

electric throttle control actuator or ECM is disconnected.

EC

OPERATION PROCEDURE

1. Make sure that accelerator pedal is fully released.

2. Turn ignition switch ON.

C

3. Turn ignition switch OFF and wait at least 10 seconds.

Make sure that throttle valve moves during above 10 seconds by confirming the operating sound.

D

Idle Air Volume Learning

UBS00J9S

DESCRIPTION

Idle Air Volume Learning is an operation to learn the idle air volume that keeps each engine within the specific E range. It must be performed under any of the following conditions:

G Each time electric throttle control actuator or ECM is replaced.

G Idle speed or ignition timing is out of specification.

F

PREPARATION

Before performing Idle Air Volume Learning, make sure that all of the following conditions are satisfied.

Learning will be cancelled if any of the following conditions are missed for even a moment.

G

G Battery voltage: More than 12.9V (At idle)

G Engine coolant temperature: 70 - 95°C (158 - 203°F) H
G PNP switch: ON

G Electric load switch: OFF (Air conditioner, headlamp, rear window defogger) On vehicles equipped with daytime light systems, if the parking brake is applied before the engine I is started the headlamp will not be illuminated.

G Steering wheel: Neutral (Straight-ahead position)

G Vehicle speed: Stopped

J

G Transmission: Warmed-up

­ A/T models

K

· With CONSULT-II: Drive vehicle until "FLUID TEMP SE" in "DATA MONITOR" mode of "A/T" system indi-

cates less than 0.9V.

· Without CONSULT-II: Drive vehicle for 10 minutes.

L

­ M/T models

· Drive vehicle for 10 minutes.

OPERATION PROCEDURE

M

With CONSULT-II

1. Perform EC-670, "Accelerator Pedal Released Position Learning" .

2. Perform EC-671, "Throttle Valve Closed Position Learning" .

3. Start engine and warm it up to normal operating temperature.

4. Check that all items listed under the topic PREPARATION (previously mentioned) are in good order.

5. Select "IDLE AIR VOL LEARN" in "WORK SUPPORT" mode.

Revision: December 2006

EC-671

SEF217Z
2006 Sentra

BASIC SERVICE PROCEDURE
6. Touch "START" and wait 20 seconds.

[QR25DE]

SEF454Y

7. Make sure that "CMPLT" is displayed on CONSULT-II screen. If "CMPLT" is not displayed, Idle Air Volume Learning will not be carried out successfully. In this case, find the cause of the incident by referring to the DIAGNOSTIC PROCEDURE below.
8. Rev up the engine 2 or 3 times and make sure that idle speed and ignition timing are within the specifications. Refer to EC669, "IDLE SPEED" .

ITEM Idle speed
Ignition timing

SPECIFICATION
M/T: 700 ± 50 rpm (in Neutral position) A/T: 700 ± 50 rpm (in P or N position)
M/T: 15 ± 5° BTDC (in Neutral position) A/T: 15 ± 5° BTDC (in P or N position)

MBIB0238E

Without CONSULT-II NOTE: G It is better to count the time accurately with a clock. G It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit
has a malfunction. 1. Perform EC-670, "Accelerator Pedal Released Position Learning" . 2. Perform EC-671, "Throttle Valve Closed Position Learning" . 3. Start engine and warm it up to normal operating temperature. 4. Check that all items listed under the topic PREPARATION (previously mentioned) are in good order. 5. Turn ignition switch OFF and wait at least 10 seconds. 6. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds. 7. Repeat the following procedure quickly 5 times within 5 seconds. a. Fully depress the accelerator pedal. b. Fully release the accelerator pedal. 8. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL stops
blinking and turned ON. 9. Fully release the accelerator pedal within 3 seconds after the MIL turned ON. 10. Start engine and let it idle.

Revision: December 2006

EC-672

2006 Sentra

11. Wait 20 seconds.

BASIC SERVICE PROCEDURE

[QR25DE]
A

EC

C

SEC897C

D

12. Rev up the engine 2 or 3 times and make sure that idle speed and ignition timing are within the specifica-

tions. Refer to EC-669, "IDLE SPEED" .

E

ITEM

SPECIFICATION

Idle speed

M/T: 700 ± 50 rpm (in Neutral position)

A/T: 700 ± 50 rpm (in P or N position)

F

Ignition timing

M/T: 15 ± 5° BTDC (in Neutral position)

A/T: 15 ± 5° BTDC (in P or N position)

13. If idle speed and ignition timing are not within the specification, Idle Air Volume Learning will not be carried G out successfully. In this case, find the cause of the incident by referring to the Diagnostic Procedure below.

DIAGNOSTIC PROCEDURE

If idle air volume learning cannot be performed successfully, proceed as follows:

H

1. Check that throttle valve is fully closed.

2. Check PCV valve operation.

3. Check that downstream of throttle valve is free from air leakage.

I

4. When the above three items check out OK, engine component parts and their installation condi-

tion are questionable. Check and eliminate the cause of the incident.

It is useful to perform EC-725, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .

J

5. If any of the following conditions occur after the engine has started, eliminate the cause of the

incident and perform Idle air volume learning all over again:

­ Engine stalls.

K

­ Erroneous idle.

Fuel Pressure Check
FUEL PRESSURE RELEASE With CONSULT-II
1. Turn ignition switch ON.
2. Perform "FUEL PRESSURE RELEASE" in "WORK SUPPORT" mode with CONSULT-II.
3. Start engine.
4. After engine stalls, crank it 2 or 3 times to release all fuel pressure.
5. Turn ignition switch OFF.

UBS00J9T

L

M

SEF214Y

Revision: December 2006

EC-673

2006 Sentra

BASIC SERVICE PROCEDURE
Without CONSULT-II 1. Remove fuel pump fuse located. 2. Start engine. 3. After engine stalls, crank it 2 or 3 times to release all fuel pres-
sure. 4. Turn ignition switch OFF. 5. Reinstall fuel pump fuse after servicing fuel system.

[QR25DE]

LEC298

FUEL PRESSURE CHECK
Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.
NOTE: Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel pressure cannot be completely released because B15 models do not have fuel return system.

Method A

CAUTION: G The fuel hose connection method used when taking fuel pressure check must not be used for
other purposes.

G Be careful not to scratch or put debris around connection area when servicing, so that the quick connector maintains saleability with O-rings inside.

1. Release fuel pressure to zero. Refer to EC-673, "FUEL PRESSURE RELEASE" .

2. Prepare fuel hose and fuel hose clamp for fuel pressure check, and connect fuel pressure gauge.

G Use suitable fuel hose for fuel pressure check (genuine NISSAN fuel hose without quick connector).

G To avoid unnecessary force or tension to hose, use moderately long fuel hose for fuel pressure check.

G Do not use the fuel hose for checking fuel pressure with damage or cracks on it.

G Use fuel pressure gauge to check fuel pressure.

3. Remove fuel hose. Refer to EM-108, "INTAKE MANIFOLD" .

G Do not twist or kink fuel hose because it is plastic hose.

G Do not remove fuel hose from quick connector.

G Keep the original fuel hose to be free from intrusion of dust or foreign substances with a suitable cover.

4. Install the fuel pressure gauge as shown in the figure.

G Wipe off oil or dirt from hose insertion part using cloth moistened with gasoline.

G Apply proper amount of gasoline between top of the fuel tube and No.1 spool.

G Insert fuel hose for fuel pressure check until it touches the No.1 spool on fuel tube.

G Use NISSAN genuine hose clamp (part number: 16439 N4710 or 16439 40U00).

G When reconnecting fuel line, always use new clamps.
G When reconnecting fuel hose, check the original fuel hose for damage and abnormality.

BBIA0111E

G Use a torque driver to tighten clamps.

Revision: December 2006

EC-674

2006 Sentra

BASIC SERVICE PROCEDURE

[QR25DE]

G Install hose clamp to the position within 1 - 2 mm (0.04 - 0.08

in).

A

Tightening torque:

1 - 1.5 N·m (0.1 - 0.15 kg-m, 9 - 13 in-lb.)

EC

G Make sure that clamp screw does not contact adjacent parts.

5. After connecting fuel hose for fuel pressure check, pull the hose

with a force of approximately 98 N (10 kg, 22 lb.) to confirm fuel

C

tube does not come off.

6. Turn ignition switch ON, and check for fuel leakage. 7. Start engine and check for fuel leakage. 8. Read the indication of fuel pressure gauge.

PBIB0669E
D

G Do not perform fuel pressure check with system operating. Fuel pressure gauge may indicate false

readings.

E

G During fuel pressure check, confirm for fuel leakage from fuel connection every 3 minutes.

At idling: Approximately 350 kPa (3.57 kg/cm2 , 51 psi)

F

9. If result is unsatisfactory, go to next step.

10. Check the following.

G Fuel hoses and fuel tubes for clogging

G

G Fuel filter for clogging

G Fuel pump

H

G Fuel pressure regulator for clogging

If OK, replace fuel pressure regulator.

If NG, repair or replace.

I

Method B

CAUTION: G Be careful not to scratch or get the fuel hose connection area dirty when servicing, so that the J
quick connector o-ring maintains sealability.

G Use Fuel Pressure Gauge Kit J-44321 and Fuel Pressure Adapter J-44321-6 to check fuel pressure.

1. Release fuel pressure to zero. Refer to EC-673, "FUEL PRESSURE RELEASE" .

K

2. Remove fuel hose using Quick Connector Release J-45488. Refer to EM-121, "FUEL INJECTOR AND

FUEL TUBE" .

G Do not twist or kink fuel hose because it is plastic hose.

L

G Do not remove fuel hose from quick connector.

G Keep fuel hose connections clean.

3. Install Fuel Pressure Adapter J-44321-6 and Fuel Pressure

M

Gauge (from kit J-44321) as shown in the figure.

G Do not distort or bend fuel rail tube when installing fuel pressure gauge adapter.

G When reconnecting fuel hose, check the original fuel hose for damage and abnormality.

4. Turn ignition switch ON (reactivate fuel pump), and check for fuel leakage. 5. Start engine and check for fuel leakage. 6. Read the indication of fuel pressure gauge.
G During fuel pressure check, check for fuel leakage from fuel connection every 3 minutes.

BBIA0436E

Revision: December 2006

EC-675

2006 Sentra

BASIC SERVICE PROCEDURE

[QR25DE]

At idling: Approximately 350 kPa (3.57 kg/cm2 , 51 psi)
7. If result is unsatisfactory, go to next step. 8. Check the following.
G Fuel hoses and fuel tubes for clogging G Fuel filter for clogging G Fuel pump G Fuel pressure regulator for clogging If OK, replace fuel pressure regulator. If NG, repair or replace. 9. Before disconnecting Fuel Pressure Gauge and Fuel Pressure Adapter J-44321-6, release fuel pressure to zero. Refer to EC-673, "FUEL PRESSURE RELEASE" .

Revision: December 2006

EC-676

2006 Sentra

TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS Trouble Diagnosis Introduction
INTRODUCTION The engine has an ECM to control major systems such as fuel control, ignition control, idle air control system, etc. The ECM accepts input signals from sensors and instantly drives actuators. It is essential that both input and output signals are proper and stable. At the same time, it is important that there are no malfunctions such as vacuum leaks, fouled spark plugs, or other malfunctions with the engine.
It is much more difficult to diagnose an incident that occurs intermittently rather than continuously. Most intermittent incidents are caused by poor electric connections or improper wiring. In this case, careful checking of suspected circuits may help prevent the replacement of good parts.
A visual check only may not find the cause of the incidents. A road test with CONSULT-II (or GST) or a circuit tester connected should be performed. Follow the WORK FLOW on EC-678 . Before undertaking actual checks, take a few minutes to talk with a customer who approaches with a driveability complaint. The customer can supply good information about such incidents, especially intermittent ones. Find out what symptoms are present and under what conditions they occur. A DIAGNOSTIC WORKSHEET like the example on EC-682 should be used. Start your diagnosis by looking for conventional malfunctions first. This will help troubleshoot driveability malfunctions on an electronically controlled engine vehicle.

[QR25DE]
PFP:00004
A
UBS00J9U
EC

C

D

MEF036D

E

F

G
H
SEF233G
I

J

K

L
SEF234G
M

Revision: December 2006

EC-677

2006 Sentra

WORK FLOW Overall Sequence

TROUBLE DIAGNOSIS

[QR25DE]

Revision: December 2006

EC-678

PBIB2267E
2006 Sentra

TROUBLE DIAGNOSIS
Detailed Flow
1. GET INFORMATION FOR SYMPTOM

[QR25DE]
A

Get the detailed information from the customer about the symptom (the condition and the environment when

the incident/malfunction occurred) using the EC-681, "DIAGNOSTIC WORKSHEET" .

EC

>> GO TO 2. C
2. CHECK DTC*1

1. Check DTC*1 .

D

2. Perform the following procedure if DTC*1 is displayed.

­ Record DTC*1 and freeze frame data*2 . (Print them out with CONSULT-II or GST.) E
­ Erase DTC*1 . (Refer to EC-653, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" .)

­ Study the relationship between the cause detected by DTC*1 and the symptom described by the cus- F tomer. (Symptom Matrix Chart is useful. Refer to EC-686 .)

3. Check related service bulletins for information.

Is any symptom described and any DTC detected?

G

Symptom is described, DTC*1 is displayed>>GO TO 3.

Symptom is described, DTC*1 is not displayed>>GO TO 4.

Symptom is not described, DTC*1 is displayed>>GO TO 5.

H

3. CONFIRM THE SYMPTOM

I

Try to confirm the symptom described by the customer (except MIL ON).

DIAGNOSIS WORK SHEET is useful to verify the incident.

Connect CONSULT-II to the vehicle in DATA MONITOR (AUTO TRIG) mode and check real time diagnosis results.

J

Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 5.

K

4. CONFIRM THE SYMPTOM

L

Try to confirm the symptom described by the customer.

DIAGNOSIS WORK SHEET is useful to verify the incident.

Connect CONSULT-II to the vehicle in DATA MONITOR (AUTO TRIG) mode and check real time diagnosis results.

M

Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 6.

Revision: December 2006

EC-679

2006 Sentra

TROUBLE DIAGNOSIS
5. PERFORM DTC CONFIRMATION PROCEDURE

[QR25DE]

Perform DTC Confirmation Procedure for the displayed DTC*1 , and then make sure that DTC*1 is detected again. At this time, always connect CONSULT-II to the vehicle, and check diagnostic results in real time on "DATA MONITOR (AUTO TRIG)". If two or more DTCs*1 are detected, refer to EC-683, "DTC Inspection Priority Chart" and determine trouble diagnosis order.
NOTE: G Freeze frame data*2 is useful if the DTC*1 is not detected.
G Perform Overall Function Check if DTC Confirmation Procedure is not included on Service Manual. This simplified check procedure is an effective alternative though DTC*1 cannot be detected during this check. If the result of Overall Function Check is NG, it is the same as the detection of DTC*1 by DTC Confirmation Procedure.
Is DTC*1 detected?
Yes >> GO TO 10. No >> Check according to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
6. PERFORM BASIC INSPECTION

Perform EC-664, "Basic Inspection" .

With CONSULT-II>>GO TO 7. Without CONSULT-II>>GO TO 9.
7. PERFORM DATA MONITOR (SPEC) MODE
With CONSULT-II Make sure that "MAS A/F SE-B1", "B/FUEL SCHDL", and "A/F ALPHA-B1" are within the SP value using CONSULT-II "DATA MONITOR (SPEC)" mode. Refer to EC-726, "Diagnostic Procedure" . Are they within the SP value?
Yes >> GO TO 9. No >> GO TO 8.

8. DETECT MALFUNCTIONING PART BY TROUBLE DIAGNOSIS - SPECIFICATION VALUE

SEF601Z

Detect malfunctioning part according to EC-725, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" . Is malfunctioning part detected?
Yes >> GO TO 11. No >> GO TO 9.
9. DETECT MALFUNCTIONING SYSTEM BY SYMPTOM MATRIX CHART

Detect malfunctioning system according to EC-686, "Symptom Matrix Chart" based on the confirmed symptom in step 4, and determine the trouble diagnosis order based on possible causes and symptom.

>> GO TO 10.

Revision: December 2006

EC-680

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

10. DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE A

Inspect according to Diagnostic Procedure of the system.

NOTE: The Diagnostic Procedure in EC section described based on open circuit inspection. A short circuit inspection EC is also required for the circuit check in the Diagnostic Procedure. For details, refer to Circuit Inspection in GI26, "How to Perform Efficient Diagnosis for an Electrical Incident" .

Is malfunctioning part detected?

C

Yes >> GO TO 11.

No >> Monitor input data from related sensors or check voltage of related ECM terminals using CON-

SULT-II. Refer to EC-719, "CONSULT-II Reference Value in Data Monitor Mode" , EC-698, "ECM D Terminals and Reference Value" .

11. REPAIR OR REPLACE THE MALFUNCTIONING PART E 1. Repair or replace the malfunctioning part.

2. Reconnect parts or connectors disconnected during Diagnostic Procedure again after repair and replace-

ment.

F

3. Check DTC. If DTC is displayed, erase it, refer to EC-653, "HOW TO ERASE EMISSION-RELATED

DIAGNOSTIC INFORMATION" .

G >> GO TO 12.

12. FINAL CHECK

H

When DTC was detected in step 2, perform DTC Confirmation Procedure or Overall Function Check again,
and then make sure that the malfunction have been repaired securely. When symptom was described from the customer, refer to confirmed symptom in step 3 or 4, and make sure I
that the symptom is not detected.

OK or NG

NG (DTC*1 is detected)>>GO TO 10.

J

NG (Symptom remains)>>GO TO 6. OK >> 1. Before returning the vehicle to the customer, make sure to erase unnecessary DTC*1 in ECM

and TCM (Transmission Control Module). (Refer to EC-653, "HOW TO ERASE EMISSION- K

RELATED DIAGNOSTIC INFORMATION" and AT-427, "HOW TO ERASE DTC" .)

2. If the completion of SRT is needed, drive vehicle under the specific driving pattern. Refer to EC-

651, "Driving Pattern" .

L

3. INSPECTION END

*1: Include 1st trip DTC.

*2: Include 1st trip freeze frame data.

M

DIAGNOSTIC WORKSHEET Description

There are many operating conditions that lead to the malfunction of engine components. A good grasp of such conditions can make troubleshooting faster and more accurate. In general, each customer feels differently about an incident. It is important to fully understand the symptoms or conditions for a customer complaint. Utilize a diagnostic worksheet like the one on the next page in order to organize all the information for troubleshooting. Some conditions may cause the MIL to come on steady or blink and DTC to be detected. Examples:

G Vehicle ran out of fuel, which caused the engine to misfire.
G Fuel filler cap was left off or incorrectly screwed on, allowing fuel to evaporate into the atmosphere.

SEF907L

Revision: December 2006

EC-681

2006 Sentra

Worksheet Sample

TROUBLE DIAGNOSIS

[QR25DE]

MTBL0017

Revision: December 2006

EC-682

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

DTC Inspection Priority Chart

UBS00J9V

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority A

chart.

NOTE: G If DTC U1000 and/or U1001 is displayed with other DTC, first perform the trouble diagnosis for EC
DTC U1000 and U1001. Refer to EC-743, "DTC U1000, U1001 CAN COMMUNICATION LINE" .

G If DTC U1010 is displayed with other DTC, first perform the trouble diagnosis for DTC U1010. Refer

to EC-746, "DTC U1010 CAN COMMUNICATION" .

C

Priority

Detected items (DTC)

1

G U1000 U1001 CAN communication line

D

G U1010 CAN communication

G P0101 P0102 P0103 Mass air flow sensor

G P0112 P0113 P0127 Intake air temperature sensor

E

G P0117 P0118 P0125 Engine coolant temperature sensor

G P0122 P0123 P0222 P0223 P1225 P1226 P2135 Throttle position sensor

G P0128 Thermostat function

F

G P0181 P0182 P0183 Fuel tank temperature sensor

G P0327 P0328 Knock sensor

G P0335 Crankshaft position sensor (POS)

G

G P0340 Camshaft position sensor (PHASE)

G P0460 P0461 P0462 P0463 Fuel level sensor

G P0500 Vehicle speed sensor

H

G P0605 ECM

G P0643 Sensor power supply

G P0850 Park/Neutral position (PNP) switch

I

G P1610-P1615 NATS

G P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor
J

K

L

M

Revision: December 2006

EC-683

2006 Sentra

Priority 2
3

TROUBLE DIAGNOSIS

[QR25DE]

Detected items (DTC)
G P0031, P0032 A/F sensor 1 heater G P0037 P0038 Heated oxygen sensor 2 heater G P0075 Intake valve timing control solenoid valve G P0130 P0131 P0132 P0133 P2A00 A/F sensor 1 G P0137 P0138 P0139 Heated oxygen sensor 2 G P0441 EVAP control system purge flow monitoring G P0443 P0444 P0445 EVAP canister purge volume control solenoid valve G P0447 P0448 EVAP canister vent control valve G P0451 P0452 P0453 EVAP control system pressure sensor G P0506 P0507 Idle speed control system G P0550 power steering pressure sensor G P0603 ECM power supply G P0705 P0710 P0720 P0725 P0740 P0745 P0750 P0755 P1705 P1760 A/T related sensors and solenoid valves G P1800 VIAS control solenoid valve G P1805 Brake switch G P2100 P2103 Electric throttle control motor relay G P2101 Electric throttle control function G P2118 Electric throttle control actuator
G P0011 Intake valve timing control G P0171 P0172 Fuel injection system function G P0300 - P0304 Misfire G P0420 Three way catalyst function G P0442 P0455 P0456 EVAP control system (SMALL LEAK, VERY SMALL LEAK, GROSS LEAK) G P0731 - P0734 A/T function G P1148 Closed loop control G P1217 Engine over temperature (OVERHEAT) G P1564 ASCD steering switch G P1572 ASCD brake switch G P1574 ASCD vehicle speed sensor G P2119 Electric throttle control actuator

Revision: December 2006

EC-684

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

Fail-safe Chart
When the DTC listed below is detected, the ECM enters fail-safe mode and the MIL lights up.

UBS00J9W
A

DTC No. Detected items

Engine operating condition in fail-safe mode

P0102

Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.

EC

P0103

P0117 P0118

Engine coolant tempera- Engine coolant temperature will be determined by ECM based on the time after turning

ture sensor circuit

ignition switch ON or START.

C

CONSULT-II displays the engine coolant temperature decided by ECM.

Condition
Just as ignition switch is turned ON or START

Engine coolant temperature decided (CONSULTII display)
D
40°C (104°F)

More than approx. 4 minutes after ignition ON or START

80°C (176°F)

E

Except as shown above

40 - 80°C (104 - 176°F) (Depends on the time)

F
When the fail-safe system for engine coolant temperature sensor is activated, the cool-

ing fan operates while engine is running.

P0122 P0123 P0222 P0223 P2135
P0643

Throttle position sensor Sensor power supply

The ECM controls the electric throttle control actuator in regulating the throttle opening

in order for the idle position to be within +10 degrees.

G

The ECM regulates the opening speed of the throttle valve to be slower than the nor-

mal condition.

So, the acceleration will be poor.

H

ECM stops the electric throttle control actuator control, throttle valve is maintained at a

fixed opening (approx. 5 degrees) by the return spring.

P2100 P2103

Throttle control relay

ECM stops the electric throttle control actuator control, throttle valve is maintained at a

I

fixed opening (approx. 5 degrees) by the return spring.

P2101

Electric throttle control func- ECM stops the electric throttle control actuator control, throttle valve is maintained at a

tion

fixed opening (approx. 5 degrees) by the return spring.

J

P2118

Throttle control motor

ECM stops the electric throttle control actuator control, throttle valve is maintained at a

fixed opening (approx. 5 degrees) by the return spring.

P2119

Electric throttle control actu- (When electric throttle control actuator does not function properly due to the return

ator

spring malfunction:)

K

ECM controls the electric throttle actuator by regulating the throttle opening around the idle position. The engine speed will not rise more than 2,000 rpm.

(When throttle valve opening angle in fail-safe mode is not in specified range:)

L

ECM controls the electric throttle control actuator by regulating the throttle opening to

20 degrees or less.

(When ECM detects the throttle valve is stuck open:)

M

While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops,

the engine stalls.

The engine can restart in N or P (A/T), Neutral (M/T) position, and engine speed will

not exceed 1,000 rpm or more.

P2122 P2123 P2127 P2128 P2138

Accelerator pedal position sensor

The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. So, the acceleration will be poor.

G When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when there is malfunction on engine control system. Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means of operating fail-safe function. The fail-safe function also operates when above diagnoses except MIL circuit are detected, and demands the driver to repair the malfunction.

Engine operating condition in fail-safe mode

Engine speed will not rise more than 2,500 rpm due to the fuel cut

Revision: December 2006

EC-685

2006 Sentra

TROUBLE DIAGNOSIS

Symptom Matrix Chart
SYSTEM -- BASIC ENGINE CONTROL SYSTEM

SYMPTOM

[QR25DE]
UBS00KJI

HARD/NO START/RESTART (EXCP. HA) ENGINE STALL HESITATION/SURGING/FLAT SPOT SPARK KNOCK/DETONATION LACK OF POWER/POOR ACCELERATION HIGH IDLE/LOW IDLE ROUGH IDLE/HUNTING IDLING VIBRATION SLOW/NO RETURN TO IDLE OVERHEATS/WATER TEMPERATURE HIGH EXCESSIVE FUEL CONSUMPTION EXCESSIVE OIL CONSUMPTION BATTERY DEAD (UNDER CHARGE)

Reference page

Warranty symptom code

Fuel Fuel pump circuit

Fuel pressure regulator system

Fuel injector circuit

Evaporative emission system

Air

Positive crankcase ventilation sys-

tem

Incorrect idle speed adjustment

Electric throttle control actuator

Ignition Incorrect ignition timing adjustment Ignition circuit
Main power supply and ground circuit
Mass air flow sensor circuit

A/F sensor 1 circuit

Engine coolant temperature sensor circuit

Throttle position sensor circuit

Accelerator pedal position sensor circuit
Knock sensor circuit Crankshaft position sensor (POS) circuit Camshaft position sensor (PHASE) circuit

AA AB AC AD AE AF AG AH AJ AK AL AM HA

11232

22

3

2 EC-1178

334444444

4

EC-674

11232

22

2

EC-1172

334444444

4

EC-626

3 34 4 4 4 4 4 4

41

EC-639

33

1 11 1

1

1 1 2 33 2 2 2 2

2

33111 11222 22333
1 1 2 22

11 22 33
22

1 2 23
2

1232

22

2

11222322312

12

22222

2

3212
22 22 22

2 3

EC-664

EC-1090,

2

EC-1096 , EC-1103 ,

EC-1108

EC-664

EC-1184

2 EC-736

EC-768, EC-777 ,

EC-812, EC-819 , EC-825 , EC-831 , EC-1140

EC-791, EC-804

EC-797, EC-891 , EC-1056 , EC-1058 , EC-1125

EC-1033, EC-1110 , EC-1117 , EC-1132

EC-905

EC-910

EC-917

Revision: December 2006

EC-686

2006 Sentra

TROUBLE DIAGNOSIS
SYMPTOM

[QR25DE]
A

HARD/NO START/RESTART (EXCP. HA) ENGINE STALL HESITATION/SURGING/FLAT SPOT SPARK KNOCK/DETONATION LACK OF POWER/POOR ACCELERATION HIGH IDLE/LOW IDLE ROUGH IDLE/HUNTING IDLING VIBRATION SLOW/NO RETURN TO IDLE OVERHEATS/WATER TEMPERATURE HIGH EXCESSIVE FUEL CONSUMPTION EXCESSIVE OIL CONSUMPTION BATTERY DEAD (UNDER CHARGE)

EC

Reference

C

page

D

E

Warranty symptom code Vehicle speed signal circuit

AA AB AC AD AE AF AG AH AJ AK AL AM HA

23

3

3

EC-1015

F

Power steering pressure sensor circuit

2

3333

EC-1021

ECM

22333333333

EC-1030,

G

EC-1026

Intake valve timing control solenoid valve circuit

3

3

2

13223

3

VIAS control solenoid valve circuit

1

EC-763
H
EC-1080,
EC-1202

PNP switch circuit Refrigerant pressure sensor circuit

3

33333

3

2

3333

4

EC-1038

I

EC-1197

Electrical load signal circuit Air conditioner circuit

3333

EC-1160

223333333

3

2 MTC-19

J

1 - 6: The numbers refer to the order of inspection. (continued on next page)
K

L

M

Revision: December 2006

EC-687

2006 Sentra

TROUBLE DIAGNOSIS

SYSTEM -- ENGINE MECHANICAL & OTHER

SYMPTOM

[QR25DE]

HARD/NO START/RESTART (EXCP. HA) ENGINE STALL HESITATION/SURGING/FLAT SPOT SPARK KNOCK/DETONATION LACK OF POWER/POOR ACCELERATION HIGH IDLE/LOW IDLE ROUGH IDLE/HUNTING IDLING VIBRATION SLOW/NO RETURN TO IDLE OVERHEATS/WATER TEMPERATURE HIGH EXCESSIVE FUEL CONSUMPTION EXCESSIVE OIL CONSUMPTION BATTERY DEAD (UNDER CHARGE)

Reference page

Warranty symptom code

AA AB AC AD AE AF AG AH AJ AK AL AM HA

Fuel

Fuel tank

Fuel piping

5

555

55

FL-7

5

FL-2

Vapor lock

5

--

Valve deposit

--

Poor fuel (Heavy weight gaso-

5

555

55

5

line, Low octane)

--

Air

Air duct

EM-106

Air cleaner

EM-106

Air leakage from air duct

(Mass air flow sensor --electric throttle control actuator)

55

5

55

5

Electric throttle control actuator

5

5

5

5

EM-106 EC-1106

Air leakage from intake manifold/ Collector/Gasket

EM-108

Cranking Battery Alternator circuit

111

1

11

SC-6

1

1

SC-21

Starter circuit

3

SC-11

Signal plate/Flywheel/Drive plate 6

CL-33or EM-164

PNP switch 4

EC-1038 AT-640 or AT-486

Engine

Cylinder head Cylinder head gasket

55555

55

5

4

3

EM-148

Cylinder block

Piston

4

Piston ring Connecting rod

66666

66

6

EM-164

Bearing

Crankshaft

Revision: December 2006

EC-688

2006 Sentra

TROUBLE DIAGNOSIS
SYMPTOM

[QR25DE]
A

HARD/NO START/RESTART (EXCP. HA) ENGINE STALL HESITATION/SURGING/FLAT SPOT SPARK KNOCK/DETONATION LACK OF POWER/POOR ACCELERATION HIGH IDLE/LOW IDLE ROUGH IDLE/HUNTING IDLING VIBRATION SLOW/NO RETURN TO IDLE OVERHEATS/WATER TEMPERATURE HIGH EXCESSIVE FUEL CONSUMPTION EXCESSIVE OIL CONSUMPTION BATTERY DEAD (UNDER CHARGE)

EC

Reference

C

page

D

E

Warranty symptom code

Valve mechanism

Timing chain Camshaft Intake valve timing control

AA AB AC AD AE AF AG AH AJ AK AL AM HA

EM-136

F

EM-126

55555

55

5

EM-136

G

Intake valve Exhaust valve

3

EM-148

Exhaust

Exhaust manifold/Tube/Muffler/ Gasket
Three way catalyst

55555

Lubrica- Oil pan/Oil strainer/Oil pump/Oil

tion

filter/Oil gallery

55555

55 55

5 52

H
EM-113, EX-3

EM-115,

I

LU-19 , LU-

18

Oil level (Low)/Filthy oil

LU-16

J

Cooling Radiator/Hose/Radiator filler cap

CO-32

Thermostat Water pump Water gallery

55555

5

55

25

CO-30
K
CO-28 CO-25

Cooling fan

5

CO-37

L

Coolant level (low)/Contaminated coolant

NVIS (NISSAN Vehicle Immobilizer System -- NATS)

1

1

CO-26
EC-641 or M
BL-96

1 - 6: The numbers refer to the order of inspection.

Revision: December 2006

EC-689

2006 Sentra

TROUBLE DIAGNOSIS Engine Control Component Parts Location

[QR25DE]
UBS00J9Y

Revision: December 2006

EC-690

BBIA0302E
2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-691

BBIA0303E
2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

Revision: December 2006

EC-692

BBIA0128E
2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-693

BBIA0342E
2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

BBIA0296E BBIA0305E

Revision: December 2006

EC-694

2006 Sentra

Vacuum Hose Drawing

TROUBLE DIAGNOSIS

[QR25DE]
UBS00J9Z
A EC
C D E F G H I J K L M

BBIA0286E
NOTE: Do not use soapy water or any type of solvent while installing vacuum hose or purge hoses. Refer to EC-617, "System Diagram" for Vacuum Control System.

Revision: December 2006

EC-695

2006 Sentra

Circuit Diagram

TROUBLE DIAGNOSIS

[QR25DE]
UBS00JA0

Revision: December 2006

EC-696

BBWA2150E
2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-697

BBWA2151E
2006 Sentra

TROUBLE DIAGNOSIS ECM Harness Connector Terminal Layout

[QR25DE]
UBS00JA1

ECM Terminals and Reference Value
PREPARATION
1. ECM is located in the right side of the cowl top (behind the strut tower).

PBIB1192E UBS00KJJ

2. Remove ECM harness protector. 3. When disconnecting ECM harness connector, loosen it with
levers as far as they will go as shown at right. 4. Connect a break-out box (SST) and Y-cable adapter (SST)
between the ECM and ECM harness connector.
G Use extreme care not to touch 2 pins at one time. G Data is for comparison and may not be exact.

BBIA0191E

BBIA0138E
ECM INSPECTION TABLE Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

1

B

ECM ground

CONDITION
[Engine is running] G Idle speed

DATA (DC Voltage) Body ground

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

Revision: December 2006

EC-698

PBIB1584E
2006 Sentra

TROUBLE DIAGNOSIS

TERMINAL NO.
3

WIRE COLOR

ITEM

R/W

Throttle control motor power supply

CONDITION [Ignition switch: ON]

4

P

Throttle control motor (Close)

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully released

5

L

Throttle control motor (Open)

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully depressed

11 G/Y

[Engine is running] G Warm-up condition G Idle speed

Intake valve timing control solenoid valve

[Engine is running] G Warm-up condition G Engine speed: 2,500 rpm

12 P

Power steering pressure sensor

[Engine is running] G Steering wheel: Being turned [Engine is running] G Steering wheel: Not being turned

13*1 14*2

Y

[Engine is running] G Warm-up condition G Idle speed
Crankshaft position sensor (POS)
[Engine is running] G Engine speed: 2,000 rpm

[QR25DE]

DATA (DC Voltage)

A

BATTERY VOLTAGE

(11 - 14V)

EC

0 - 14V

C

0 - 14V

D
PBIB0534E
E

F

PBIB0533E

G

BATTERY VOLTAGE (11 - 14V)
H
7 - 10V

I

0.5 - 4.0V

J
PBIB1790E
K

0.4 - 0.8V
L
Approximately 3.0V

M

Approximately 3.0V

PBIB0527E

PBIB0528E

Revision: December 2006

EC-699

2006 Sentra

TERMINAL NO.

WIRE COLOR

TROUBLE DIAGNOSIS

ITEM

CONDITION

13*2 14*1

W/R

[Engine is running] G Warm-up condition G Idle speed
Camshaft position sensor (PHASE)

[Engine is running] G Engine speed: 2,000 rpm.

[QR25DE]
DATA (DC Voltage) 1.0 - 4.0V

1.0 - 4.0V

PBIB0525E

15 W

Knock sensor

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

22 G/B 23 R/B 41 L/B 42 Y/B

Fuel injector No. 3 Fuel injector No. 1 Fuel injector No. 4 Fuel injector No. 2

[Engine is running] G Idle speed [Engine is running] G Warm-up condition G Idle speed
[Engine is running] G Warm-up condition G Idle speed
[Engine is running] G Warm-up condition G Engine speed: 2,000 rpm

PBIB0526E
Approximately 2.5V
Approximately 3.1V Approximately 2.6V 2 - 3V 2 - 3V BATTERY VOLTAGE (11 - 14V)

BATTERY VOLTAGE (11 - 14V)

PBIB0529E

25 W/B

Heated oxygen sensor 2 heater

[Engine is running] G Engine speed: Below 3,600 rpm after
the following conditions are met. ­ Engine: After warming up ­ Keeping the engine speed between
3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load
[Ignition switch: ON] G Engine stopped [Engine is running] G Engine speed: Above 3,600 rpm.

0 - 1.0V
BATTERY VOLTAGE (11 - 14V)

PBIB0530E

Revision: December 2006

EC-700

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

A

[Engine is running]

BATTERY VOLTAGE

G Idle speed

(11 - 14V)

EC

29 Y/R

VIAS control solenoid valve

[Engine is running] G Engine speed: Above 5,000 rpm

0 - 1.0V

32 L

EVAP control system pressure sensor

[Ignition switch: ON]

C
Approximately 1.8 - 4.8V

34 Y/G

Intake air temperature sensor

[Engine is running]

Approximately 0 - 4.8V

Output voltage varies with intake

D

air temperature.

BATTERY VOLTAGE

(11 - 14V)

E

[Engine is running]

G Idle speed

G Accelerator pedal: Not depressed even

F

slightly, after engine starting

45 GY/L

EVAP canister purge volume control solenoid valve

PBIB0050E

G

Approximately 10V

H
[Engine is running]
G Engine speed: About 2,000 rpm (More than 100 seconds after starting engine)
I

PBIB0520E

47 B

Sensor power supply (Throttle position sensor)

[Ignition switch: ON]

Approximately 5V

J

48 R/W

Sensor power supply (EVAP control system pressure sensor)

[Ignition switch: ON]

Approximately 5V
K

49 R/Y

Sensor power supply (Refrigerant pressure sensor)

[Ignition switch: ON]

Approximately 5V
L

[Ignition switch: ON]

G Engine stopped

G Shift lever: D (A/T), 1ST (M/T)

More than 0.36V

M

50 W

Throttle position sensor 1

G Accelerator pedal: Fully released [Ignition switch: ON]

G Engine stopped G Shift lever: D (A/T), 1ST (M/T)

Less than 4.75V

G Accelerator pedal: Fully depressed

51 L/R

Mass air flow sensor

[Engine is running] G Warm-up condition G Idle speed
[Engine is running] G Warm-up condition G Engine speed: 2,500 rpm.

0.9 - 1.1V 1.5 - 1.8V

Revision: December 2006

EC-701

2006 Sentra

TERMINAL NO.

WIRE COLOR

TROUBLE DIAGNOSIS

ITEM

CONDITION

61 L/W

Ignition signal No. 3

62 BR

Ignition signal No. 1

80 GY/R Ignition signal No. 4

81 PU

Ignition signal No. 2

[Engine is running] G Warm-up condition G Idle speed
[Engine is running] G Warm-up condition G Engine speed: 2,000 rpm.

[QR25DE]
DATA (DC Voltage) 0 - 0.1V

0 - 0.2V

PBIB0521E

PBIB0522E

66 R

Sensor ground (Throttle position sensor)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

67 B/W

Sensor ground (MAF sensor, IAT sensor, ECT sensor, EVAP control system pressure sensor, PSP sensor, ASCD steering switch, Refrigerant pressure sensor)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

68 G/R

Sensor power supply (Power steering pressure sensor)

[Ignition switch: ON]

Approximately 5V

69 G

Throttle position sensor 2

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully released
[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully depressed

Less than 4.75V More than 0.36V

70 L

Refrigerant pressure sensor

[Engine is running]
G Warm-up condition G Both A/C switch and blower switch: ON
(Compressor operates.)

1.0 - 4.0V

73

BR/W

Engine coolant temperature sensor

[Engine is running]

Approximately 0 - 4.8V Output voltage varies with engine coolant temperature.

74 R/L

Heated oxygen sensor 2

[Engine is running]
G Revving engine from idle to 3,000 rpm quickly after the following conditions are met.
­ Engine: After warming up
­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load

0 - Approximately 1.0V

Revision: December 2006

EC-702

2006 Sentra

TROUBLE DIAGNOSIS

TERMINAL NO.

WIRE COLOR

ITEM

78 B

Sensor ground (Heated oxygen sensor 2)

82 B/Y 83 G

Sensor ground (Accelerator pedal position sensor 1)
Sensor ground (Accelerator pedal position sensor 2)

84 PU

Electrical load signal (Headlamp signal)

85 LG 86 Y

DATA link connector CAN communication line

89 LG/B

Cooling fan relay (High)

90 R 91 R/Y 93 L/W 94 L

Sensor power supply (Accelerator pedal position sensor 1) Sensor power supply (Accelerator pedal position sensor 2)
Electrical load signal (Rear window defogger signal)
CAN communication line

96 Y/G

Electrical load signal (Heater fan switch)

97 LG/R Cooling fan relay (Low)

98 R/B

Accelerator pedal position sensor 2

CONDITION
[Engine is running] G Warm-up condition G Idle speed [Engine is running] G Warm-up condition G Idle speed [Engine is running] G Warm-up condition G Idle speed [Lighting switch: ON] G Lighting switch: 2nd position [Lighting switch: ON] G Lighting switch: OFF [Ignition switch: ON] G CONSULT-II or GST: Disconnected. [Ignition switch: ON] [Engine is running] G Cooling fan: Not operating [Engine is running] G Cooling fan: High speed operating
[Ignition switch: ON]
[Ignition switch: ON]
[Ignition switch: ON] G Rear window defogger switch: ON [Ignition switch: ON] G Rear window defogger switch: OFF [Ignition switch: ON] [Engine is running] G Heater fan switch: ON [Engine is running] G Heater fan switch: OFF [Ignition switch: ON] G Cooling fan: Not operating [Ignition switch: ON] G Cooling fan: Operating [Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully depressed

[QR25DE]

DATA (DC Voltage)

A

Approximately 0V

EC

Approximately 0V

C

D
Approximately 0V

BATTERY VOLTAGE

E

(11 - 14V)

Approximately 0V
F

BATTERY VOLTAGE (11 - 14V)

Approximately 2.3V

G

BATTERY VOLTAGE (11 - 14V)
H
0 - 1.0V

I
Approximately 5V

Approximately 5V

J

BATTERY VOLTAGE

(11 - 14V)

K

Approximately 0V
L
Approximately 2.8V

Approximately 0V
M
Approximately 5V

BATTERY VOLTAGE (11 - 14V)

0 - 1.0V

0.28 - 0.48V

More than 2.0V

Revision: December 2006

EC-703

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

TERMINAL NO.

WIRE COLOR

ITEM

99 W/R

ASCD steering switch

101 R/G

Stop lamp switch

102 G/OR PNP switch

104 P

Throttle control motor relay

106 W

Accelerator pedal position sensor 1

107 OR

Fuel tank temperature sensor

108 P/L

ASCD brake switch

109 B/R

Ignition switch

111 W/G

ECM relay (Self shut-off)

Revision: December 2006

CONDITION

DATA (DC Voltage)

[Ignition switch: ON] G ASCD steering switch: OFF.

Approximately 4V

[Ignition switch: ON] G MAIN switch: Pressed

Approximately 0V

[Ignition switch: ON] G CANCEL switch: Pressed

Approximately 1V

[Ignition switch: ON]
G RESUME/ACCELERATE switch: Pressed

Approximately 3V

[Ignition switch: ON] G SET/COAST switch: Pressed

Approximately 2V

[Ignition switch: OFF] G Brake pedal: Fully released

Approximately 0V

[Ignition switch: OFF] G Brake pedal: Slightly depressed

BATTERY VOLTAGE (11 - 14V)

[Ignition switch: ON] G Shift lever: P or N (A/T), Neutral (M/T)

Approximately 0V

[Ignition switch: ON] G Except above position

BATTERY VOLTAGE (11 - 14V)

[Ignition switch: OFF]

BATTERY VOLTAGE (11 - 14V)

[Ignition switch: ON]

0 - 1.0V

[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully released

0.65 - 0.87V

[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully depressed

More than 4.3V

[Engine is running]

Approximately 0 - 4.8V Output voltage varies with fuel tank temperature.

[Ignition switch: ON] G Brake pedal: Slightly depressed (A/T) G Brake pedal and/or clutch pedal: Slightly
depressed (M/T)

Approximately 0V

[Ignition switch: ON] G Brake pedal: Fully released (A/T) G Brake pedal and clutch pedal: Fully
released (M/T)

BATTERY VOLTAGE (11 - 14V)

[Ignition switch: OFF]

0V

[Ignition switch: ON]

BATTERY VOLTAGE (11 - 14V)

[Engine is running] [Ignition switch: OFF]
G For a few seconds after turning ignition switch OFF

0 - 1.0V

[Ignition switch: OFF]
G More than a few seconds after turning ignition switch OFF

BATTERY VOLTAGE (11 - 14V)

EC-704

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

A

[Ignition switch: ON]

G For 1 second after turning ignition switch ON

0 - 1.0V

EC

113*1 (114)*2

B/P

Fuel pump relay

[Engine is running]

[Ignition switch: ON]

C

BATTERY VOLTAGE

G More than 1 second after turning ignition (11 - 14V)

switch ON.

115 116

B

ECM ground

[Engine is running] G Idle speed

Body ground

D

117 L/Y

EVAP canister vent control valve

[Ignition switch: ON]

BATTERY VOLTAGE

(11 - 14V)

E

119 120

R/G

121 W/L

Power supply for ECM
Power supply for ECM (Back-up)

[Ignition switch: ON] [Ignition switch: OFF]

BATTERY VOLTAGE (11 - 14V)

BATTERY VOLTAGE

F

(11 - 14V)

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

*1: Without NVIS (NATS).

G

*2: With NVIS (NATS).

CONSULT-II Function (ENGINE)
FUNCTION

UBS00JA3

H

Diagnostic test mode

Function

Work support

This mode enables a technician to adjust some devices faster and more accurately by following the

I

indications on the CONSULT-II unit.

Self-diagnostic results Data monitor

Self-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame data

can be read and erased quickly.*

J

Input/Output data in the ECM can be read.

Data monitor (SPEC)

Input/Output of the specification for Basic fuel schedule, AFM, A/F feedback control value and the

other data monitor items can be read.

K

CAN diagnostic support monitor

The results of transmit/receive diagnosis of CAN communication can be read.

Active test

Diagnostic Test Mode in which CONSULT-II drives some actuators apart from the ECMs and also

L

shifts some parameters in a specified range.

Function test

This mode is used to inform customers when their vehicle condition requires periodic maintenance.

DTC & SRT confirmation

The status of system monitoring tests and the self-diagnosis status/result can be confirmed.

M

ECM part number

ECM part number can be read.

*: The following emission-related diagnostic information is cleared when the ECM memory is erased. G Diagnostic trouble codes G 1st trip diagnostic trouble codes G Freeze frame data G 1st trip freeze frame data G System readiness test (SRT) codes G Test values

Revision: December 2006

EC-705

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

ENGINE CONTROL COMPONENT PARTS/CONTROL SYSTEMS APPLICATION

DIAGNOSTIC TEST MODE

Item

WORK SUPPORT

SELF-DIAGNOSTIC RESULTS

DTC*1

FREEZE FRAME DATA*2

DATA MONITOR

DATA MONITOR (SPEC)

ACTIVE TEST

DTC & SRT CONFIRMATION

SRT STATUS

DTC WORK SUPPORT

Crankshaft position sensor (POS)

×

×

×

×

Camshaft position sensor (PHASE)

×

×

×

×

Mass air flow sensor

×

×

×

Engine coolant temperature sensor

×

×

×

×

×

Air fuel ratio (A/F) sensor 1 Heated oxygen sensor 2

×

×

×

×

×

×

×

×

×

×

Vehicle speed sensor

×

×

×

×

Accelerator pedal position sensor Throttle position sensor

×

×

×

×

×

×

×

ENGINE CONTROL COMPONENT PARTS INPUT

Fuel tank temperature sensor

×

×

×

×

EVAP control system pressure sensor

×

×

×

Intake air temperature sensor

×

×

×

×

Knock sensor Refrigerant pressure sensor

×

×

×

Closed throttle position switch (accelerator pedal position sensor signal)

×

×

Air conditioner switch

×

×

Park/neutral position (PNP) switch

×

×

×

Stop lamp switch

×

×

×

Power steering pressure sensor

×

×

×

Battery voltage Load signal

×

×

×

×

Fuel level sensor

×

×

×

ASCD steering switch

×

×

×

ASCD brake switch

×

×

×

ASCD clutch switch

×

×

×

Revision: December 2006

EC-706

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

Item Fuel injector

WORK SUPPORT

DIAGNOSTIC TEST MODE

SELF-DIAGNOSTIC

A
DTC & SRT

RESULTS

DTC*1

FREEZE FRAME DATA*2

DATA MONITOR

DATA MONITOR (SPEC)

ACTIVE TEST

CONFIRMATION

SRT STATUS

DTC WORK SUPPORT

EC

×

×

×

C

Power transistor (Ignition timing)

×

×

×

ENGINE CONTROL COMPONENT PARTS OUTPUT

Throttle control motor relay

×

×

×

D

Throttle control motor

×

EVAP canister purge volume control solenoid valve

×

×

×

×

×

E

Air conditioner relay

×

×

Fuel pump relay

×

×

×

×

F

Cooling fan relay

×

×

×

×

Air fuel ratio (A/F) sensor 1 heater

×

Heated oxygen sensor 2 heater

×

×

×

×

×

×*3

×*3

G

EVAP canister vent control valve

×

×

×

×

×

Intake valve timing control solenoid valve

×

×

×

×

H

VIAS control solenoid valve

×

×

×

×

Calculated load value

×

×

×

I

X: Applicable *1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame data or freeze frame data. The items appear on CONSULT-II screen in freeze frame data J
mode only if a 1st trip DTC or DTC is detected. For details, refer to EC-646 . *3: Always "CMPLT" is displayed.

INSPECTION PROCEDURE

K

1. Turn ignition switch OFF.

2. Connect CONSULT-II and CONSULT-II CONVERTER to data

link connector, which is located under LH dash panel.

L

3. Turn ignition switch ON.

M

LAT136
4. Touch "START" (NISSAN BASED VHCL).

Revision: December 2006

EC-707

BCIA0029E
2006 Sentra

TROUBLE DIAGNOSIS
5. Touch "ENGINE". If "ENGINE" is not indicated, go to GI-38, "CONSULT-II Data Link Connector (DLC) Circuit" .

[QR25DE]

6. Perform each diagnostic test mode according to each service procedure.
For further information, see the CONSULT-II Operation Manual.

BCIA0030E

BCIA0031E

WORK SUPPORT MODE Work Item

WORK ITEM

CONDITION

USAGE

FUEL PRESSURE RELEASE

G FUEL PUMP WILL STOP BY TOUCHING START DURING IDLING. CRANK A FEW TIMES AFTER ENGINE STALLS.

When releasing fuel pressure from fuel line

IDLE AIR VOL LEARN

G THE IDLE AIR VOLUME THAT KEEPS THE ENGINE WITHIN THE SPECIFIED RANGE IS MEMORIZED IN ECM.

When learning the idle air volume

SELF-LEARNING CONT

G THE COEFFICIENT OF SELF-LEARNING CONTROL When clearing the coefficient of MIXTURE RATIO RETURNS TO THE ORIGINAL COEF- self-learning control value FICIENT.

EVAP SYSTEM CLOSE

CLOSE THE EVAP CANISTER VENT CONTROL VALVE IN ORDER TO MAKE EVAP SYSTEM CLOSE UNDER THE FOLLOWING CONDITIONS.
G IGN SW ON
G ENGINE NOT RUNNING
G AMBIENT TEMPERATURE IS ABOVE 0°C (32°F).
G NO VACUUM AND NO HIGH PRESSURE IN EVAP SYSTEM
G FUEL TANK TEMP. IS MORE THAN 0°C (32°F).
G WITHIN 10 MINUTES AFTER STARTING "EVAP SYSTEM CLOSE"
G WHEN TRYING TO EXECUTE "EVAP SYSTEM CLOSE" UNDER THE CONDITION EXCEPT ABOVE, CONSULTII WILL DISCONTINUE IT AND DISPLAY APPROPRIATE INSTRUCTION.
NOTE: WHEN STARTING ENGINE, CONSULT-II MAY DISPLAY "BATTERY VOLTAGE IS LOW. CHARGE BATTERY", EVEN IN USING CHARGED BATTERY.

When detecting EVAP vapor leak point of EVAP system

VIN REGISTRATION

G IN THIS MODE, VIN IS REGISTERED IN ECM

When registering VIN in ECM

Revision: December 2006

EC-708

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

WORK ITEM TARGET IDLE RPM ADJ* TARGET IGN TIM ADJ*

G IDLE CONDITION G IDLE CONDITION

CONDITION

*: This function is not necessary in the usual service procedure.

USAGE
A
When setting target idle speed
When adjusting target ignition timing
EC

SELF-DIAG RESULTS MODE

Self Diagnostic Item

C

Regarding items of "DTC and 1st trip DTC", refer to EC-643, "EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS" .

Freeze Frame Data and 1st Trip Freeze Frame Data

D

Freeze frame data item

Description

E

DIAG TROUBLE CODE [PXXXX]

G The engine control component part/control system has a trouble code, it is displayed as "PXXXX". (Refer to EC-605, "INDEX FOR DTC" .)

G "Fuel injection system status" at the moment a malfunction is detected is displayed.

F

G One mode in the following is displayed.

FUEL SYS-B1

"Mode2": Open loop due to detected system malfunction

"Mode3": Open loop due to driving conditions (power enrichment, deceleration enleanment)

G

"Mode4": Closed loop - using oxygen sensor(s) as feedback for fuel control

"Mode5": Open loop - has not yet satisfied condition to go to closed loop

CAL/LD VALUE [%] G The calculated load value at the moment a malfunction is detected is displayed.

H

COOLANT TEMP [°C] or [°F]

G The engine coolant temperature at the moment a malfunction is detected is displayed.

G "Long-term fuel trim" at the moment a malfunction is detected is displayed.

I

L-FUEL TRM-B1 [%] G The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule

than short-term fuel trim.

G "Short-term fuel trim" at the moment a malfunction is detected is displayed.

J

S-FUEL TRM-B1 [%] G The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel

schedule.

ENGINE SPEED [rpm]

G The engine speed at the moment a malfunction is detected is displayed.

K

VEHICL SPEED [km/ h] or [mph]

G The vehicle speed at the moment a malfunction is detected is displayed.

L

ABSOL TH-P/S [%] G The throttle valve opening angle at the moment a malfunction is detected is displayed.

B/FUEL SCHDL [msec]

G The base fuel schedule at the moment a malfunction is detected is displayed.

M

INT/A TEMP SE [°C] or [°F]

G The intake air temperature at the moment a malfunction is detected is displayed.

*: The items are the same as those of 1st trip freeze frame data.

Revision: December 2006

EC-709

2006 Sentra

DATA MONITOR MODE Monitored Item

Monitored item [Unit]

ECM INPUT SIGNALS

ENG SPEED [rpm]

×

MAS A/F SE-B1 [V]

×

B/FUEL SCHDL [msec]

A/F ALPHA-B1 [%]

COOLAN TEMP/S [°C] or [°F]

×

A/F SEN1 (B1) [V]

×

HO2S2 (B1) [V]

×

HO2S2 MNTR (B1) [RICH/LEAN]

×

VHCL SPEED SE [km/h] or [mph]

×

BATTERY VOLT [V]

×

ACCEL SEN 1 [V]

×

ACCEL SEN 2 [V]

×

THRTL SEN 1 [V]

×

THRTL SEN 2 [V]

×

FUEL T/TMP SE [°C] or [°F]

×

VEHICLE SPEED [km/h] or [MPH]

×

INT/A TEMP SE [°C] or [°F]

×

MAIN SIGNALS
× × × × × ×
× × × ×
×

TROUBLE DIAGNOSIS

[QR25DE]

×: Applicable

Description

Remarks

G Indicates the engine speed computed from the signals of the crankshaft position sensor (POS) and camshaft position sensor (PHASE).

G Accuracy becomes poor if engine speed drops below the idle rpm.
G If the signal is interrupted while the engine is running, an abnormal value may be indicated.

G The signal voltage of the mass air flow sensor is displayed.

G When the engine is stopped, a certain value is indicated.

G "Base fuel schedule" indicates the fuel injection pulse width programmed into ECM, prior to any learned on board correction.

G The mean value of the air-fuel ratio feedback correction factor per cycle is indicated.

G When the engine is stopped, a certain value is indicated.
G This data also includes the data for the air-fuel ratio learning control.

G The engine coolant temperature (determined by the signal voltage of the engine coolant temperature sensor) is displayed.

G When the engine coolant temperature sensor is open or short-circulated, ECM enters fail-safe mode. The engine coolant temperature determined by the ECM is displayed.

G The A/F signal computed from the input signal of the A/F sensor 1 is displayed.

G The signal voltage of the heated oxygen sensor 2 is displayed.

G Display of heated oxygen sensor 2 signal: RICH... means the amount of oxygen after three way catalyst is relatively small. LEAN... means the amount of oxygen after three way catalyst is relatively large.

G When the engine is stopped, a certain value is indicated.

G The vehicle speed computed from the vehicle speed signal sent from combination meter is displayed.

G The power supply voltage of ECM is displayed.

G The accelerator pedal position sensor signal voltage is displayed.

G ACCEL SEN 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.

G The throttle position sensor signal voltage is displayed.

G THRTL SEN 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.

G The fuel temperature (determined by the signal voltage of the fuel tank temperature sensor) is displayed.

G Indicates the vehicle speed computed from the revolution sensor signal.

G The intake air temperature (determined by the signal voltage of the intake air temperature sensor) is indicated.

Revision: December 2006

EC-710

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

Monitored item [Unit]

ECM INPUT SIGNALS

MAIN SIGNALS

Description

A
Remarks

EVAP SYS PRES [V]

×

G The signal voltage of EVAP control system pressure sensor is displayed.

EC

FUEL LEVEL SE [V]

×

START SIGNAL [ON/ OFF]

×

G The signal voltage of the fuel level sen-

sor is displayed.

C

G Indicates start signal status [ON/OFF]

×

computed by the ECM according to the G After starting the engine, [OFF] is dissignals of engine speed and battery volt- played regardless of the starter signal.

age.

D

CLSD THL POS [ON/ OFF]

×

G Indicates idle position [ON/OFF] com-

×

puted by ECM according to the accelera-

tor pedal position sensor signal.

E

AIR COND SIG [ON/ OFF]

×

G Indicates [ON/OFF] condition of the air

×

conditioner switch as determined by the

air conditioner signal.

F

P/N POSI SW [ON/OFF]

×

×

G Indicates [ON/OFF] condition from the park/neutral position (PNP) switch signal.

G [ON/OFF] condition of the power steering

G

PW/ST SIGNAL [ON/ OFF]

×

×

system (determined by the power steering pressure sensor) signal voltage of the

is indicated.

G Indicates [ON/OFF] condition from the

H

electrical load signal.

LOAD SIGNAL [ON/ OFF]

×

ON... Rear window defogger switch is

×

ON and/or lighting switch is in 2nd posi-

tion.

I

OFF... Both rear window defogger switch

and lighting switch are OFF.

IGNITION SW [ON/OFF]

×

G Indicates [ON/OFF] condition from ignition switch.

J

HEATER FAN SW [ON/OFF]

×

G Indicates [ON/OFF] condition from the heater fan switch signal.

K

BRAKE SW [ON/OFF]

×

INJ PULSE-B1 [msec]

G Indicates [ON/OFF] condition from the stop lamp switch signal.

×

G Indicates the actual fuel injection pulse width compensated by ECM according to the input signals.

G When the engine is stopped, a certain computed value is indicated.

L

IGN TIMING [BTDC]

×

G Indicates the ignition timing computed by G When the engine is stopped, a certain

ECM according to the input signals.

value is indicated.

M

CAL/LD VALUE [%]

G "Calculated load value" indicates the value of the current airflow divided by peak airflow.

MASS AIRFLOW [g·m/s]

G Indicates the mass airflow computed by ECM according to the signal voltage of the mass air flow sensor.

PURG VOL C/V [%]

G Indicates the EVAP canister purge volume control solenoid valve control value computed by the ECM according to the input signals.
G The opening becomes larger as the value increases.

INT/V TIM (B1) [°CA]

G Indicates [°CA] of intake camshaft advanced angle.

Revision: December 2006

EC-711

2006 Sentra

TROUBLE DIAGNOSIS

Monitored item [Unit]

ECM INPUT SIGNALS

INT/V SOL (B1) [%]

VIAS S/V [ON/OFF]

AIR COND RLY [ON/ OFF]
FUEL PUMP RLY [ON/OFF]

VENT CONT/V [ON/ OFF]

THRTL RELAY [ON/ OFF]

COOLING FAN [HI/LOW/OFF]

HO2S2 HTR (B1) [ON/OFF]

IDL A/V LEARN [YET/ CMPLT]
TRVL AFTER MIL [km] or [mile]
A/F S1 HTR (B1) [%]

AC PRESS SEN [V]

×

VHCL SPEED SE [km/h] or [mph]

MAIN SIGNALS
× ×
× ×

Description
G The control value of the intake valve timing control solenoid valve (determined by ECM according to the input signal) is indicated.
G The advance angle becomes larger as the value increases.
G The control condition of the VIAS control solenoid valve (determined by ECM according to the input signals) is indicated. ON... VIAS control solenoid valve is operating. OFF... VIAS control solenoid valve is not operating.
G The air conditioner relay control condition (determined by ECM according to the input signals) is indicated.
G Indicates the fuel pump relay control condition determined by ECM according to the input signals.
G The control condition of the EVAP canister vent control valve (determined by ECM according to the input signals) is indicated. ON... Closed OFF... Open
G Indicates the throttle control motor relay control condition determined by the ECM according to the input signals.
G Indicates the condition of the cooling fan (determined by ECM according to the input signals). HI... High speed operation LOW... Low speed operation OFF... Stop
G Indicates [ON/OFF] condition of heated oxygen sensor 2 heater determined by ECM according to the input signals.
G Display the condition of idle air volume learning YET... Idle Air Volume Learning has not been performed yet. CMPLT... Idle Air Volume Learning has already been performed successfully.
G Distance traveled while MIL is activated.
G Indicates A/F sensor 1 heater control value computed by ECM according to the input signals.
G The current flow to the heater becomes larger as the value increases.
G The signal voltage from the refrigerant pressure sensor is displayed.
G The vehicle speed computed from the vehicle speed signal sent from TCM is displayed.

Revision: December 2006

EC-712

[QR25DE]
Remarks
2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

Monitored item [Unit]

ECM INPUT SIGNALS

MAIN SIGNALS

Description

A
Remarks

SET VHCL SPD [km/h] or [mph]

G The preset vehicle speed is displayed.

EC

MAIN SW

G Indicates [ON/OFF] condition from MAIN

[ON/OFF]

switch signal.

C

CANCEL SW

G Indicates [ON/OFF] condition from CAN-

[ON/OFF]

CEL switch signal.

RESUME/ACC SW

G Indicates [ON/OFF] condition from

D

[ON/OFF]

RESUME/ACCELERATE switch signal.

SET SW

G Indicates [ON/OFF] condition from SET/

[ON/OFF]

COAST switch signal.

E

BRAKE SW1 [ON/OFF]

G Indicates [ON/OFF] condition from ASCD brake switch signal, and ASCD clutch switch signal (M/T models).

BRAKE SW2

G Indicates [ON/OFF] condition of stop

F

[ON/OFF]

lamp switch signal.

G Indicates the vehicle cruise condition.

NON... Vehicle speed is maintained at

G

VHCL SPD CUT

the ASCD set speed.

[NON/CUT]

CUT...Vehicle speed increased to exces-

sively high compared with the ASCD set speed, and ASCD operation is cut off.

H

G Indicates the vehicle cruise condition.

NON... Vehicle speed is maintained at

LO SPEED CUT [NON/CUT]

the ASCD set speed. CUT...Vehicle speed decreased to excessively low compared with the

I

ASCD set speed, and ASCD operation is

cut off.

J

AT OD MONITOR [ON/OFF]

G Indicates [ON/OFF] condition of A/T O/D according to the input signal from the TCM.

G For M/T models always "OFF" is displayed.

K

AT OD CANCEL [ON/OFF]
CRUISE LAMP [ON/OFF]

G Indicates [ON/OFF] condition of A/T O/D G For M/T models always "OFF" is dis-

cancel signal sent from the TCM.

played.

G Indicates [ON/OFF] condition of CRUISE

L

lamp determined by the ECM according

to the input signals.

SET LAMP [ON/OFF]

G Indicates [ON/OFF] condition of SET lamp determined by the ECM according to the input signals.

M

Voltage [V]

Frequency [msec], [Hz] or [%] DUTY-HI DUTY-LOW PLS WIDTH-HI

G Voltage, frequency, duty cycle or pulse width measured by the probe.

G Only "#" is displayed if item is unable to be measured.
G Figures with "#"s are temporary ones. They are the same figures as an actual piece of data which was just previously measured.

PLS WIDTH-LOW

Revision: December 2006

EC-713

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

DATA MONITOR (SPEC) MODE Monitored Item

Monitored item [Unit]

ECM INPUT SIGNALS

MAIN SIGNALS

Description

Remarks

ENG SPEED [rpm]

×

G Indicates the engine speed computed from the signal of the crankshaft position sensor (POS) and camshaft position sensor (PHASE).

MAS A/F SE-B1 [V]

×

×

G The signal voltage of the mass air flow sensor specification is displayed.

G When engine is running specification range is indicated.

B/FUEL SCHDL [msec]

G "Base fuel schedule" indicates the fuel injection pulse width programmed into ECM, prior to any learned on board correction.

G When engine is running specification range is indicated.

A/F ALPHA-B1 [%]

G When engine is running specification

G The mean value of the air-fuel ratio feed- range is indicated.

×

back correction factor per cycle is indi-

cated.

G This data also includes the data for the

air-fuel ratio learning control.

NOTE: Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.

ACTIVE TEST MODE Test Item

TEST ITEM
FUEL INJECTION

CONDITION
G Engine: Return to the original trouble condition
G Change the amount of fuel injection using CONSULT-II.

JUDGEMENT
If trouble symptom disappears, see CHECK ITEM.

CHECK ITEM (REMEDY)
G Harness and connectors G Fuel injector G Air fuel ratio (A/F) sensor 1

IGNITION TIMING
POWER BALANCE
COOLING FAN
ENG COOLANT TEMP
FUEL PUMP RELAY

G Engine: Return to the original trouble condition
G Timing light: Set G Retard the ignition timing using
CONSULT-II.
G Engine: After warming up, idle the engine.
G A/C switch OFF G Shift lever P or N (A/T), Neutral
(M/T) G Cut off each fuel injector signal
one at a time using CONSULT-II.
G Ignition switch: ON G Turn the cooling fan "LOW", "HI"
and "OFF" with CONSULT-II.
G Engine: Return to the original trouble condition
G Change the engine coolant temperature using CONSULT-II.
G Ignition switch: ON (Engine stopped)
G Turn the fuel pump relay ON and OFF using CONSULT-II and listen to operating sound.

If trouble symptom disappears, see CHECK ITEM.
Engine runs rough or dies.
Cooling fan moves and stops. If trouble symptom disappears, see CHECK ITEM.
Fuel pump relay makes the operating sound.

G Perform Idle Air Volume Learning.
G Harness and connectors G Compression G Fuel injector G Power transistor G Spark plug G Ignition coil G Harness and connectors G Cooling fan relay G Cooling fan motor G Harness and connectors G Engine coolant temperature sen-
sor G Fuel injector
G Harness and connectors G Fuel pump relay

Revision: December 2006

EC-714

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

TEST ITEM

CONDITION

JUDGEMENT

CHECK ITEM (REMEDY)

A
G Ignition switch: ON

VIAS SOL VALVE G Turn solenoid valve ON and OFF with CONSULT-II and listen for

Solenoid valve makes an operating sound.

G Harness and connectors G Solenoid valve

operating sound.

EC

G Engine: After warming up, run

engine at 1,500 rpm.

PURG VOL

G Change the EVAP canister purge Engine speed changes according to G Harness and connectors

C

CONT/V

volume control solenoid valve

the opening percent.

G Solenoid valve

opening percent using CON-

SULT-II.

D

FUEL/T TEMP SEN

G Change the fuel tank temperature using CONSULT-II.

VENT CONTROL/V
V/T ASSIGN ANGLE

G Ignition switch: ON (Engine stopped)

Solenoid valve makes an operating G Harness and connectors

E

G Turn solenoid valve "ON" and

sound.

"OFF" with the CONSULT-II and

G Solenoid valve

listen to operating sound.

F

G Engine: Return to the original trouble condition

G Harness and connectors If trouble symptom disappears, see

G Change intake valve timing using CHECK ITEM. CONSULT-II.

G Intake valve timing control sole-

noid valve

G

DTC & SRT CONFIRMATION MODE

SRT STATUS Mode

H

For details, refer to EC-647, "SYSTEM READINESS TEST (SRT) CODE" .

SRT WORK SUPPORT Mode

I

This mode enables a technician to drive a vehicle to set the SRT while monitoring the SRT status.

DTC WORK SUPPORT Mode
Test mode

Test item

J

Corresponding DTC No.

Reference page

EVAPORATIVE SYSTEM

EVP SML LEAK P0442/P1442* EVP V/S LEAK P0456/P1456*

P0442 P0455 P0456

EC-935

EC-991

K

EC-999

PURG VOL CN/V P1444 PURG FLOW P0441

P0443 P0441

EC-944

EC-929

L

A/F SEN1

A/F SEN1 (B1) P1278/P1279 A/F SEN1 (B1) P1276 HO2S2 (B1) P1146

P0133 P0130 P0138

EC-831

EC-812

M

EC-849

HO2S2

HO2S2 (B1) P1147

P0137

EC-841

HO2S2 (B1) P0139

P0139

EC-859

*: DTC P1442 and P1456 does not apply to B15 models but appears in DTC WORK SUPPORT Mode screens.

REAL TIME DIAGNOSIS IN DATA MONITOR MODE (RECORDING VEHICLE DATA) Description CONSULT-II has two kinds of triggers and they can be selected by touching "SETTING" in "DATA MONITOR" mode. 1. "AUTO TRIG" (Automatic trigger):

Revision: December 2006

EC-715

2006 Sentra

TROUBLE DIAGNOSIS
G The malfunction will be identified on the CONSULT-II screen in real time. In other words, DTC/1st trip DTC and malfunction item will be displayed if the malfunction is detected by ECM. At the moment a malfunction is detected by ECM, "MONITOR" in "DATA MONITOR" screen is changed to "Recording Data ... xx%" as shown at right, and the data after the malfunction detection is recorded. Then when the percentage reached 100%, "REAL-TIME DIAG" screen is displayed. If "STOP" is touched on the screen during "Recording Data ... xx%", "REAL-TIME DIAG" screen is also displayed. The recording time after the malfunction detection and the recording speed can be changed by "TRIGGER POINT" and "Recording Speed". Refer to CONSULT-II Operation Manual.
2. "MANU TRIG" (Manual trigger):
G DTC/1st trip DTC and malfunction item will not be displayed automatically on CONSULT-II screen even though a malfunction is detected by ECM. DATA MONITOR can be performed continuously even though a malfunction is detected.

[QR25DE]
PBIB1593E

SEF707X
Operation 1. "AUTO TRIG"
G While trying to detect the DTC/1st trip DTC by performing the DTC Confirmation Procedure, be sure to select to "DATA MONITOR (AUTO TRIG)" mode. You can confirm the malfunction at the moment it is detected.
G While narrowing down the possible causes, CONSULT-II should be set in "DATA MONITOR (AUTO TRIG)" mode, especially in case the incident is intermittent. When you are inspecting the circuit by gently shaking (or twisting) the suspicious connectors, components and harness in the DTC Confirmation Procedure, the moment a malfunction is found the DTC/1st trip DTC will be displayed. (Refer to "Incident Simulation Tests" in GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident" .)
2. "MANU TRIG"
G If the malfunction is displayed as soon as "DATA MONITOR" is selected, reset CONSULT-II to "MANU TRIG". By selecting "MANU TRIG" you can monitor and store the data. The data can be utilized for further diagnosis, such as a comparison with the value for the normal operating condition.

Revision: December 2006

EC-716

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]
A

EC

C

D

E

F

G

Generic Scan Tool (GST) Function
DESCRIPTION
Generic Scan Tool (OBDII scan tool) complying with SAE J1978 has 8 different functions explained below. ISO9141 is used as the protocol. The name "GST" or "Generic Scan Tool" is used in this service manual.

H
PBIB0197E
I
UBS00JA4
J
K
L

FUNCTION
Diagnostic service Service $01 READINESS TESTS
Service $02 (FREEZE DATA)
Service $03 DTCs

SEF139P

M

Function
This diagnostic service gains access to current emission-related data values, including analog inputs and outputs, digital inputs and outputs, and system status information.
This diagnostic service gains access to emission-related data value which were stored by ECM during the freeze frame. For details, refer to EC-646, "FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA" .
This diagnostic service gains access to emission-related power train trouble codes which were stored by ECM.

Revision: December 2006

EC-717

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

Diagnostic service Service $04 CLEAR DIAG INFO
Service $06 (ON BOARD TESTS) Service $07 (ON BOARD TESTS)

Service $08

--

Service $09 (CALIBRATION ID)

Function
This diagnostic service can clear all emission-related diagnostic information. This includes: G Clear number of diagnostic trouble codes (Service $01) G Clear diagnostic trouble codes (Service $03) G Clear trouble code for freeze frame data (Service $01) G Clear freeze frame data (Service $02) G Reset status of system monitoring test (Service $01) G Clear on board monitoring test results (Service $06 and $07)
This diagnostic service accesses the results of on board diagnostic monitoring tests of specific components/systems that are not continuously monitored.
This diagnostic service enables the off board test drive to obtain test results for emissionrelated powertrain components/systems that are continuously monitored during normal driving conditions.
This diagnostic service can close EVAP system in ignition switch ON position (Engine stopped). When this diagnostic service is performed, EVAP canister vent control valve can be closed. In the following conditions, this diagnostic service cannot function. G Low ambient temperature G Low battery voltage G Engine running G Ignition switch OFF G Low fuel temperature G Too much pressure is applied to EVAP system
This diagnostic service enables the off-board test device to request specific vehicle information such as Vehicle Identification Number (VIN) and Calibration IDs.

INSPECTION PROCEDURE 1. Turn ignition switch OFF. 2. Connect GST to data link connector, which is located under LH
dash panel near the fuse box cover.
3. Turn ignition switch ON.

4. Enter the program according to instruction on the screen or in the operation manual.
(*: Regarding GST screens in this section, sample screens are shown.)

Revision: December 2006

EC-718

LAT136
SEF398S
2006 Sentra

TROUBLE DIAGNOSIS
5. Perform each diagnostic service according to each service procedure.
For further information, see the GST Operation Manual of the tool maker.

[QR25DE]
A EC

C

CONSULT-II Reference Value in Data Monitor Mode

SEF416S
D
UBS00KJK

Remarks:

G Specification data are reference values.

G Specification data are output/input values which are detected or supplied by the ECM at the connector.

E

* Specification data may not be directly related to their components signals/values/operations.

i.e. Adjust ignition timing with a timing light before monitoring IGN TIMING, because the monitor may show the specification data in

spite of the ignition timing not being adjusted to the specification data. This IGN TIMING monitors the data calculated by the ECM

according to the signals input from the camshaft position sensor and other ignition timing related sensors.

MONITOR ITEM

CONDITION

SPECIFICATION

F

ENG SPEED

G Run engine and compare the CONSULT-II value with tachometer indica- Almost the same speed as the

tion.

tachometer indication.

G

MAS A/F SE-B1

G See EC-725, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .

B/FUEL SCHDL

G See EC-725, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .

A/F ALPHA-B1

G See EC-725, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .

H

COOLAN TEMP/S G Engine: After warming up

More than 70°C (158°F)

A/F SEN1 (B1)

G Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5V

I

HO2S2 (B1)

G Revving engine from idle to 3,000 rpm quickly after the following conditions are met.

­ Engine: After warming up

0 - 0.3V  Approx. 0.6 - 1.0V

J

­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load

G Revving engine from idle to 3,000 rpm quickly after the following condi-

K

tions are met.

HO2S2 MNTR (B1) ­ Engine: After warming up

LEAN  RICH

­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute

L

and at idle for 1 minute under no load

VHCL SPEED SE

G Turn drive wheels and compare the CONSULT-II value with speedometer Almost the same speed as the

indication.

speedometer indication.

M

BATTERY VOLT

G Ignition switch: ON (Engine stopped)

11 - 14V

ACCEL SEN 1

G Ignition switch: ON (Engine stopped)
G Shift lever: D (A/T), 1ST (M/T)

Accelerator pedal: Fully released Accelerator pedal: Fully depressed

0.65 - 0.87V More than 4.3V

ACCEL SEN 2*

G Ignition switch: ON (Engine stopped)
G Shift lever: D (A/T), 1ST (M/T)

Accelerator pedal: Fully released Accelerator pedal: Fully depressed

0.56 - 0.96V More than 4.0V

THRTL SEN 1 THRTL SEN 2*

G Ignition switch: ON (Engine stopped)
G Shift lever: D (A/T), 1ST (M/T)

Accelerator pedal: Fully released Accelerator pedal: Fully depressed

More than 0.36V Less than 4.75V

EVAP SYS PRES G Ignition switch: ON

1.8 - 4.8V

START SIGNAL

G Ignition switch: ON  START  ON

OFF  ON  OFF

CLSD THL POS

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released

ON

Accelerator pedal: Slightly depressed OFF

Revision: December 2006

EC-719

2006 Sentra

MONITOR ITEM AIR COND SIG P/N POSI SW PW/ST SIGNAL LOAD SIGNAL IGNITION SW HEATER FAN SW BRAKE SW INJ PULSE-B1
IGN TIMING
CAL/LD VALUE
MASS AIRFLOW
PURG VOL C/V
INT/V TIM (B1)

TROUBLE DIAGNOSIS

[QR25DE]

CONDITION

SPECIFICATION

G Engine: After warming up, idle the engine

Air conditioner switch: OFF
Air conditioner switch: ON (Compressor operates.)

OFF ON

G Ignition switch: ON

Shift lever: P or N (A/T), Neutral (M/T) ON

Shift lever: Except above position

OFF

G Engine: After warming up, idle the engine

Steering wheel: Not being turned. (Forward direction)
Steering wheel: Being turned.

OFF ON

G Ignition switch: ON

Rear window defogger switch: ON and/or Lighting switch: 2nd position
Rear window defogger switch is OFF and lighting switch: OFF

ON OFF

G Ignition switch: ON  OFF  ON

ON  OFF  ON

G Engine: After warming up, idle the engine

Heater fan: Operating Heater fan: Not operating

ON OFF

G Ignition switch: ON

Brake pedal: Fully released Brake pedal: Slightly depressed

OFF ON

G Engine: After warming up G Shift lever: P or N (A/T), Neutral
(M/T) G Air conditioner switch: OFF G No-load

Idle 2,000 rpm

2.0 - 3.0 msec 1.9 - 2.9 msec

G Engine: After warming up G Shift lever: P or N (A/T), Neutral
(M/T) G Air conditioner switch: OFF G No-load

Idle 2,000 rpm

10° - 20° BTDC 25° - 45° BTDC

G Engine: After warming up G Shift lever: P or N (A/T), Neutral
(M/T) G Air conditioner switch: OFF G No-load

Idle 2,500 rpm

10% - 35% 10% - 35%

G Engine: After warming up G Shift lever: P or N (A/T), Neutral
(M/T) G Air conditioner switch: OFF G No-load

Idle 2,500 rpm

1.0 - 4.0 g·m/s 4.0 - 10.0 g·m/s

G Engine: After warming up

Idle

G Shift lever: P or N (A/T), Neutral (Accelerator pedal: Not depressed

0%

(M/T)

even slightly, after engine starting)

G Air conditioner switch: OFF

2,000 rpm

--

G No-load

G Engine: After warming up G Shift lever: P or N (A/T), Neutral
(M/T) G Air conditioner switch: OFF G No-load

Idle 2,000 rpm

-5° - 5°CA Approx. 0° - 20°CA

Revision: December 2006

EC-720

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

MONITOR ITEM INT/V SOL (B1)

CONDITION

G Engine: After warming up G Shift lever: P or N (A/T), Neutral
(M/T) G Air conditioner switch: OFF G No-load

Idle 2,000 rpm

SPECIFICATION
A
0% - 2%

Approx. 25% - 60%

EC

Idle

OFF

VIAS S/V

G Engine: After warming up

C

More than 5,000 rpm

ON

Air conditioner switch: OFF

OFF

AIR COND RLY

G Engine: After warming up, idle the engine

Air conditioner switch: ON (Compressor operates)

ON

D

G For 1 seconds after turning ignition switch ON

ON

FUEL PUMP RLY G Engine running or cranking

E

G Except above conditions

OFF

VENT CONT/V THRTL RELAY

G Ignition switch: ON G Ignition switch: ON

OFF

ON

F

Engine coolant temperature is 94°C (201°F) or less

OFF

G
G Engine: After warming up, idle Engine coolant temperature is

COOLING FAN

the engine

between 95°C (203°F) and 99°C

LOW

G Air conditioner switch: OFF

(210°F)

Engine coolant temperature is 100°C (212°F) or more

HIGH

H

G Engine speed: Below 3,600 rpm after the following conditions are met

­ Engine: After warming up

I
ON

HO2S2 HTR (B1) ­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute

and at idle for 1 minute under no load.

G Engine speed: Above 3,600 rpm

OFF

J

TRVL AFTER MIL G Ignition switch: ON

Vehicle has traveled after MIL has turned ON.

0 - 65,535 km (0 - 40,723 mile)

A/F S1 HTR (B1)

G Engine: After warming up, idle the engine

0 - 100%

K

AC PRESS SEN

G Ignition switch: ON (Engine stopped) G Engine: Idle G Air conditioner switch: OFF

Approx. 0V

1.0 - 4.0V

L

VHCL SPEED SE

G Turn drive wheels and compare the CONSULT-II value with speedometer Almost the same speed as the

indication.

speedometer indication.

M

SET VHCL SPD

G Engine: Running

ASCD: Operating

The preset vehicle speed is displayed.

MAIN SW

G Ignition switch: ON

MAIN switch: Pressed MAIN switch: Released

ON OFF

CANCEL SW

G Ignition switch: ON

CANCEL switch: Pressed CANCEL switch: Released

ON OFF

RESUME/ACC SW G Ignition switch: ON

RESUME/ACCELERATE switch: Pressed
RESUME/ACCELERATE switch: Released

ON OFF

SET SW

G Ignition switch: ON

SET/COAST switch: Pressed SET/COAST switch: Released

ON OFF

Revision: December 2006

EC-721

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

MONITOR ITEM

CONDITION

SPECIFICATION

BRAKE SW1 (ASCD brake switch)

G Ignition switch: ON

Clutch pedal (M/T) and brake pedal: Fully released
Clutch pedal (M/T) and/or brake pedal: Slightly depressed

ON OFF

BRAKE SW2 (Stop lamp switch)

G Ignition switch: ON

Brake pedal: Fully released Brake pedal: Slightly depressed

OFF ON

CRUISE LAMP

G Ignition switch: ON

MAIN switch: Pressed at 1st time  2nd time

ON  OFF

SET LAMP

G MAIN switch: ON
G When vehicle speed is between 40 km/h (25 MPH) and 144 km/h (89 MPH)

ASCD: Operating ASCD: Not operating

ON OFF

*: Accelerator pedal position sensor 2 signal and throttle position sensor 2 signal are converted by ECM internally. Thus, they differ from ECM terminals voltage signal.

Major Sensor Reference Graph in Data Monitor Mode

UBS00KJL

The following are the major sensor reference graphs in "DATA MONITOR" mode.

CLSD THL POS, ACCEL SEN 1, THRTL SEN 1
Below is the data for "CLSD THL POS", "ACCEL SEN 1" and "THRTL SEN 1" when depressing the accelerator pedal with the ignition switch ON and with shift lever in D position (A/T), 1st position (M/T). The signal of "ACCEL SEN 1" and "THRTL SEN 1" should rise gradually without any intermittent drop or rise after "CLSD THL POS" is changed from "ON" to "OFF".

PBIB0198E
ENG SPEED, MAS A/F SE-B1, THRTL SEN 1, HO2S2 (B1), INJ PULSE-B1 Below is the data for "ENG SPEED", "MAS A/F SE-B1", "THRTL SEN 1", "HO2S2 (B1)" and "INJ PULSE-B1" when revving engine quickly up to 4,800 rpm under no load after warming up engine sufficiently.

Revision: December 2006

EC-722

2006 Sentra

TROUBLE DIAGNOSIS
Each value is for reference, the exact value may vary.

[QR25DE]
A EC
C D E F
PBIB2445E
G H I J K L M

Revision: December 2006

EC-723

2006 Sentra

TROUBLE DIAGNOSIS

[QR25DE]

Revision: December 2006

EC-724

PBIB2099E
2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

[QR25DE]

TROUBLE DIAGNOSIS - SPECIFICATION VALUE Description

PFP:00031
A
UBS00JA7

The specification (SP) value indicates the tolerance of the value that is displayed in "DATA MONITOR (SPEC)" mode of CONSULT-II during normal operation of the Engine Control System. When the value in "DATA MONI- EC TOR (SPEC)" mode is within the SP value, the Engine Control System is confirmed OK. When the value in "DATA MONITOR (SPEC)" mode is NOT within the SP value, the Engine Control System may have one or more malfunctions. The SP value is used to detect malfunctions that may affect the Engine Control System, but will not light the C MIL. The SP value will be displayed for the following three items:

G B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board cor- D rection)

G A/F ALPHA-B1 (The mean value of air-fuel ratio feedback correction factor per cycle)

G MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)

E

Testing Condition

UBS00JA8

G Vehicle driven distance: More than 5,000 km (3,107 miles)

F

G Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm2 , 14.25 - 15.12 psi)

G Atmospheric temperature: 20 - 30°C (68 - 86°F)

G Engine coolant temperature: 75 - 95°C (167 - 203°F)

G

G Transmission: Warmed-up*1

G Electrical load: Not applied*2

H

G Engine speed: Idle

*1: For A/T models, after the engine is warmed up to normal operating temperature, drive vehicle until "FLUID

TEMP SE" (A/T fluid temperature sensor signal) indicates more than 60°C (140°F).

I

For M/T models, after the engine is warmed up to normal operating temperature, drive vehicle for 5 minutes.

*2: Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight

ahead.
Inspection Procedure

J
UBS00JA9

NOTE:

Perform "DATA MONITOR (SPEC)" mode in maximum scale display.

K

1. Perform EC-664, "Basic Inspection" .

2. Confirm that the testing conditions indicated above are met.

3. Select "B/FUEL SCHDL", "A/F ALPHA-B1" and "MAS A/F SE-

L

B1" in "DATA MONITOR (SPEC)" mode with CONSULT-II.

4. Make sure that monitor items are within the SP value.

5. If NG, go to EC-726, "Diagnostic Procedure" .

M

SEF601Z

Revision: December 2006

EC-725

2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE
Diagnostic Procedure
OVERALL SEQUENCE

[QR25DE]
UBS00KK3

Revision: December 2006

EC-726

PBIB2318E
2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

[QR25DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-727

PBIB2509E
2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE
DETAILED PROCEDURE
1. CHECK "A/F ALPHA-B1"
1. Start engine. 2. Confirm that the testing conditions are met. Refer to EC-725, "Testing Condition" . 3. Select "A/F ALPHA-B1" in "DATA MONITOR (SPEC)" mode,
and make sure that the indication is within the SP value. NOTE: Check "A/F ALPHA-B1" for approximately 1 minute because they may fluctuate. It is NG if the indication is out of the SP value even a little. OK or NG OK >> GO TO 17. NG (Less than the SP value)>>GO TO 2. NG (More than the SP value)>>GO TO 3.
2. CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within the SP value. OK or NG
OK >> GO TO 4. NG (More than the SP value)>>GO TO 19.

[QR25DE]
PBIB2369E

3. CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within the SP value. OK or NG
OK >> GO TO 6. NG (More than the SP value)>>GO TO 6. NG (Less than the SP value)>>GO TO 25.

PBIB2332E

4. CHECK "A/F ALPHA-B1"

PBIB2332E

1. Stop the engine. 2. Disconnect PCV hose, and then plug it. 3. Start engine. 4. Select "A/F ALPHA-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within
the SP value. OK or NG
OK >> GO TO 5. NG >> GO TO 6.

Revision: December 2006

EC-728

2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

[QR25DE]

5. CHANGE ENGINE OIL A

1. Stop the engine.

2. Change engine oil.

NOTE:

EC

This symptom may occur when a large amount of gasoline is mixed with engine oil because of driving

conditions (such as when engine oil temperature does not rise enough since a journey distance is too

short during winter). The symptom will not be detected after changing engine oil or changing driving con- C

dition.

>> INSPECTION END

D

6. CHECK FUEL PRESSURE

Check fuel pressure. (Refer to EC-673, "Fuel Pressure Check" .)

E

OK or NG

OK >> GO TO 9.

NG (Fuel pressure is too high)>>Replace fuel pressure regulator, refer to EC-673 . GO TO 8.

F

NG (Fuel pressure is too low)>>GO TO 7.

7. DETECT MALFUNCTIONING PART

G

1. Check the following.

­ Clogged and bent fuel hose and fuel tube

H

­ Clogged fuel filter

­ Fuel pump and its circuit (Refer to EC-1178, "FUEL PUMP" .)

2. If NG, repair or replace the malfunctioning part. (Refer to EC-673 .)

I

If OK, replace fuel pressure regulator.

>> GO TO 8.

J

8. CHECK "A/F ALPHA-B1"

1. Start engine.

K

2. Select "A/F ALPHA-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within

the SP value.

OK or NG

L

OK >> INSPECTION END NG >> GO TO 9.
M
9. PERFORM POWER BALANCE TEST

1. Perform "POWER BALANCE" in "ACTIVE TEST" mode.
2. Make sure that the each cylinder produces a momentary engine speed drop.
OK or NG
OK >> GO TO 12. NG >> GO TO 10.

PBIB0133E

Revision: December 2006

EC-729

2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE
10. DETECT MALFUNCTIONING PART

[QR25DE]

1. Check the following. ­ Ignition coil and its circuit (Refer to EC-1184, "IGNITION SIGNAL" .) ­ Fuel injector and its circuit (Refer to EC-1172, "FUEL INJECTOR" .) ­ Intake air leakage ­ Low compression pressure (Refer to EM-148, "CHECKING COMPRESSION PRESSURE" .) 2. If NG, repair or replace the malfunctioning part.
If OK, replace fuel injector. (It may be caused by leakage from fuel injector or clogging.)

>> GO TO 11.
11. CHECK "A/F ALPHA-B1"
1. Start engine. 2. Select "A/F ALPHA-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within
the SP value. OK or NG
OK >> INSPECTION END NG >> GO TO 12.
12. CHECK A/F SENSOR 1 FUNCTION
Perform all DTC Confirmation Procedure related with A/F sensor 1. G For DTC P0130, refer to EC-812, "DTC Confirmation Procedure" . G For DTC P0131, refer to EC-820, "DTC Confirmation Procedure" . G For DTC P0132, refer to EC-826, "DTC Confirmation Procedure" . G For DTC P0133, refer to EC-832, "DTC Confirmation Procedure" . G For DTC P2A00, refer to EC-1141, "DTC Confirmation Procedure" . OK or NG
OK >> GO TO 15. NG >> GO TO 13.
13. CHECK A/F SENSOR 1 CIRCUIT
Perform Diagnostic Procedure according to corresponding DTC.

>> GO TO 14.
14. CHECK "A/F ALPHA-B1"
1. Start engine. 2. Select "A/F ALPHA-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within
the SP value. OK or NG
OK >> INSPECTION END NG >> GO TO 15.
15. DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR
1. Stop the engine. 2. Disconnect ECM harness connector. Check pin terminal and connector for damage, and then reconnect it.

>> GO TO 16.

Revision: December 2006

EC-730

2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

[QR25DE]

16. CHECK "A/F ALPHA-B1" A

1. Start engine.

2. Select "A/F ALPHA-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within

the SP value.

EC

OK or NG

OK >> INSPECTION END

NG >> Detect malfunctioning part according to EC-94, "Symptom Matrix Chart" .

C

17. CHECK "B/FUEL SCHDL"

Select "B/FUEL SCHDL" in "DATA MONITOR (SPEC)" mode, and

D

make sure that the indication is within the SP value.

OK or NG E
OK >> INSPECTION END NG (More than the SP value)>>GO TO 18. NG (Less than the SP value)>>GO TO 25.
F

18. DETECT MALFUNCTIONING PART
1. Check for the cause of large engine friction. Refer to the following. ­ Engine oil level is too high ­ Engine oil viscosity ­ Belt tension of power steering, alternator, A/C compressor, etc. is excessive ­ Noise from engine ­ Noise from transmission, etc. 2. Check for the cause of insufficient combustion. Refer to the following. ­ Valve clearance malfunction ­ Intake valve timing control function malfunction ­ Camshaft sprocket installation malfunction, etc.
>> Repair or replace malfunctioning part, and then GO TO 30.
19. CHECK INTAKE SYSTEM
Check for the cause of uneven air flow through mass air flow sensor. Refer to the following. G Crushed air ducts G Malfunctioning seal of air cleaner element G Uneven dirt of air cleaner element G Improper specification of intake air system OK or NG
OK >> GO TO 21. NG >> Repair or replace malfunctioning part, and then GO TO 20.

G
PBIB2332E
H I J K L M

Revision: December 2006

EC-731

2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE
20. CHECK "A/F ALPHA-B1" AND "B/FUEL SCHDL"

[QR25DE]

Select "A/F ALPHA-B1" and "B/FUEL SCHDL" in "DATA MONITOR (SPEC)" mode, and make sure that the each indication is within the SP value. OK or NG
OK >> INSPECTION END NG ("B/FUEL SCHDL" is more, "A/F ALPHA-B1" is less than the SP value)>>GO TO 21.
21. DISCONNECT AND RECONNECT MASS AIR FLOW SENSOR HARNESS CONNECTOR

1. Stop the engine.
2. Disconnect mass air flow sensor harness connector. Check pin terminal and connector for damage and then reconnect it again.

>> GO TO 22.
22. CHECK "A/F ALPHA-B1"
1. Start engine. 2. Select "A/F ALPHA-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within
the SP value. OK or NG
OK >> 1. Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to EC-777 . 2. GO TO 29.
NG >> GO TO 23.
23. CHECK "MAS A/F SE-B1"
Select "MAS A/F SE-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within the SP value. OK or NG
OK >> GO TO 24. NG (More than the SP value)>>Replace mass air flow sensor, and
then GO TO 29.

24. REPLACE ECM

PBIB2370E

1. Replace ECM. 2. Perform initialization of NVIS(NATS) system and registration of all NVIS(NATS) ignition key IDs. Refer to
BL-96, "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM -- NATS)" . 3. Perform EC-670, "VIN Registration" . 4. Perform EC-670, "Accelerator Pedal Released Position Learning" . 5. Perform EC-671, "Throttle Valve Closed Position Learning" . 6. Perform EC-671, "Idle Air Volume Learning" .

>> GO TO 29.

Revision: December 2006

EC-732

2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE
25. CHECK INTAKE SYSTEM
Check for the cause of uneven air flow through mass air flow sensor. Refer to the following. G Crushed air ducts G Malfunctioning seal of air cleaner element G Uneven dirt of air cleaner element G Improper specification of intake air system OK or NG
OK >> GO TO 27. NG >> Repair or replace malfunctioning part, and then GO TO 26.
26. CHECK "B/FUEL SCHDL"

[QR25DE]
A EC
C D

Select "B/FUEL SCHDL" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within the E SP value.

OK or NG

OK >> INSPECTION END

F

NG (Less than the SP value)>>GO TO 27.

27. CHECK "MAS A/F SE-B1" G

Select "MAS A/F SE-B1" in "DATA MONITOR (SPEC)" mode, and make sure that the indication is within the SP value.

OK or NG

H

OK >> GO TO 28.

NG (Less than the SP value)>>Replace mass air flow sensor, and

then GO TO 30.

I

J

28. CHECK INTAKE SYSTEM

PBIB2370E
K

Check for the cause of air leak after the mass air flow sensor. Refer to the following.

G Disconnection, looseness, and cracks in air duct

L

G Looseness of oil filler cap

G Disconnection of oil level gauge

G Open stuck, breakage, hose disconnection, or cracks of PCV valve

M

G Disconnection or cracks of EVAP purge hose, open stuck of EVAP canister purge volume control solenoid valve

G Malfunctioning seal of rocker cover gasket

G Disconnection, looseness, or cracks of hoses, such as vacuum hose, connecting to intake air system parts

G Malfunctioning seal of intake air system, etc.

>> GO TO 30.
29. CHECK "A/F ALPHA-B1" AND "B/FUEL SCHDL"

Select "A/F ALPHA-B1" and "B/FUEL SCHDL" in "DATA MONITOR (SPEC)" mode, and make sure that the each indication is within the SP value.
OK or NG
OK >> INSPECTION END NG >> Detect malfunctioning part according to EC-94, "Symptom Matrix Chart" .

Revision: December 2006

EC-733

2006 Sentra

TROUBLE DIAGNOSIS - SPECIFICATION VALUE
30. CHECK "B/FUEL SCHDL"

[QR25DE]

Select "B/FUEL SCHDL" in "DATA MONITOR (SPEC)" mode, and then make sure that the indication is within the SP value.
OK or NG
OK >> INSPECTION END NG >> Detect malfunctioning part according to EC-94, "Symptom Matrix Chart" .

Revision: December 2006

EC-734

2006 Sentra

TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT
[QR25DE]

TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT Description

PFP:00006
A
UBS00JAB

Intermittent incidents may occur. In many cases, the malfunction resolves itself (the part or circuit function

returns to normal without intervention). It is important to realize that the symptoms described in the customer's EC

complaint often do not recur on (1st trip) DTC visits. Realize also that the most frequent cause of intermittent

incident occurrences is poor electrical connections. Because of this, the conditions under which the incident

occurred may not be clear. Therefore, circuit checks made as part of the standard diagnostic procedure may

not indicate the specific malfunctioning area.

C

Common Intermittent Incidents Report Situations

STEP in Work Flow

Situation

D

2

The CONSULT-II is used. The SELF-DIAG RESULTS screen shows time data other than 0 or [1t].

3 or 4

The symptom described by the customer does not recur.

5

(1st trip) DTC does not appear during the DTC Confirmation Procedure.

E

10

The Diagnostic Procedure for PXXXX does not indicate the malfunctioning area.

Diagnostic Procedure

UBS00JAC

F

1. INSPECTION START G Erase (1st trip) DTCs. Refer to EC-653, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" .

H >> GO TO 2.

2. CHECK GROUND TERMINALS

I

Check ground terminals for corroding or loose connection.

Refer to EC-742, "Ground Inspection" .

OK or NG

J

OK >> GO TO 3.

NG >> Repair or replace.

3. SEARCH FOR ELECTRICAL INCIDENT

K

Perform GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident" , "INCIDENT SIMULATION TESTS".

L

OK or NG

OK >> GO TO 4. NG >> Repair or replace.

M

4. CHECK CONNECTOR TERMINALS

Refer to GI-23, "How to Check Terminal" , "HOW TO PROBE CONNECTORS", "How to Check Enlarged Contact Spring of Terminal".
OK or NG
OK >> INSPECTION END NG >> Repair or replace connector.

Revision: December 2006

EC-735

2006 Sentra

POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT Wiring Diagram

[QR25DE]
PFP:24110
UBS00JAD

Revision: December 2006

EC-736

BBWA2318E
2006 Sentra

POWER SUPPLY AND GROUND CIRCUIT

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

1

B

ECM ground

[Engine is running]

Body ground

C

G Idle speed

109 B/R

Ignition switch

[Ignition switch: OFF] [Ignition switch: ON]

0V

BATTERY VOLTAGE

D

(11 - 14V)

[Engine is running]

[Ignition switch: OFF]

E

0 - 1.0V

G For a few seconds after turning ignition

111 W/G

ECM relay (Self shut-off)

switch OFF

[Ignition switch: OFF]

F
BATTERY VOLTAGE

G More than a few seconds after turning (11 - 14V)

ignition switch OFF

115 116

B

ECM ground

[Engine is running] G Idle speed

Body ground

G

119 120

R/G

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE

(11 - 14V)

H

Diagnostic Procedure
1. INSPECTION START

UBS00JAE
I

Start engine.

Is engine running?

Yes or No

J

Yes >> GO TO 11.
No >> GO TO 2. K
2. CHECK ECM POWER SUPPLY CIRCUIT-I

1. Turn ignition switch OFF and then ON.

L

2. Check voltage between ECM terminal 109 and ground with

CONSULT-II or tester.

Voltage: Battery voltage

M

OK or NG
OK >> GO TO 4. NG >> GO TO 3.

MBIB0015E

Revision: December 2006

EC-737

2006 Sentra

POWER SUPPLY AND GROUND CIRCUIT
3. DETECT MALFUNCTIONING PART
Check the following. G Fuse block (J/B) connector M1 G 10A fuse G Harness connectors M19, E108 G Harness connectors E10, F48 G Harness for open or short between ECM and fuse

[QR25DE]

>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body.
Refer to EC-742, "Ground Inspection" .

OK or NG OK >> GO TO 5. NG >> Repair or replace ground connections.
5. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I
1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminals 1, 115, 116 and ground.
Refer to Wiring Diagram.
Continuity should exist. 3. Also check harness for short to power. OK or NG
OK >> GO TO 7. NG >> GO TO 6.
6. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors F26, M58 G Harness for open or short between ECM and ground
>> Repair open circuit or short to power in harness or connectors.

Revision: December 2006

EC-738

BBIA0515E
2006 Sentra

POWER SUPPLY AND GROUND CIRCUIT
7. CHECK ECM POWER SUPPLY CIRCUIT-II
1. Disconnect ECM relay.

[QR25DE]
A EC

C

2. Check voltage between ECM relay terminals 1, 6 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 9. NG >> GO TO 8.

D
BBIA0100E
E
F
G

8. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E10, F48 G 10A fuse G 15A fuse G Fuse and fusible link box E22, E24 G Harness for open or short between ECM relay and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 111 and ECM relay terminal 2. Refer to Wiring Diagram.
Continuity should exist. 2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 10. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
10. CHECK ECM RELAY
Refer to EC-742, "Component Inspection" . OK or NG
OK >> Go to EC-1184, "IGNITION SIGNAL" . NG >> Replace ECM relay.

H
SEF420X
I J K L M

Revision: December 2006

EC-739

2006 Sentra

POWER SUPPLY AND GROUND CIRCUIT

11. CHECK ECM POWER SUPPLY CIRCUIT-III

1. Stop engine and wait at least 10 seconds.
2. Turn ignition switch ON and then OFF. 3. Check voltage between ECM terminals 119, 120 and ground
with CONSULT-II or tester.

Voltage:

After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop approximately 0V.

OK or NG OK >> GO TO 16. NG (Battery voltage does not exist.)>>GO TO 12. NG (Battery voltage exists for more than a few seconds.)>>GO TO 14.
12. CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Disconnect ECM relay.

[QR25DE]
PBIB1630E

2. Check voltage between ECM relay terminal 3 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 14. NG >> GO TO 13.

BBIA0100E

13. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E10, F48 G 10A fuse G Harness for open or short between ECM relay and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.

SEF860T

Revision: December 2006

EC-740

2006 Sentra

POWER SUPPLY AND GROUND CIRCUIT
14. CHECK ECM POWER SUPPLY CIRCUIT-V
1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminals 119, 120 and ECM relay terminal 5.
Refer to Wiring Diagram.
Continuity should exist. 3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 15. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
15. CHECK ECM RELAY
Refer to EC-742, "Component Inspection" . OK or NG
OK >> GO TO 16. NG >> Replace ECM relay.
16. CHECK GROUND CONNECTIONS
1. Loosen and retighten two ground screws on the body. Refer to EC-742, "Ground Inspection" .

[QR25DE]
A EC
C D E F G H

I

J

OK or NG OK >> GO TO 17. NG >> Repair or replace ground connections.
17. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II
1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminals 1, 115, 116 and ground.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to power. OK or NG
OK >> GO TO 19. NG >> GO TO 18.
18. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors F26, M58 G Harness for open or short between ECM and ground

>> Repair open circuit or short to power in harness or connectors.

Revision: December 2006

EC-741

BBIA0515E

K

L

M

2006 Sentra

POWER SUPPLY AND GROUND CIRCUIT

19. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
ECM RELAY 1. Apply 12V direct current between ECM relay terminals 1 and 2. 2. Check continuity between relay terminals 3 and 5, 6 and 7.

Condition 12V direct current supply between terminals 1 and 2 OFF
3. If NG, replace ECM relay.

Continuity Yes No

[QR25DE]
UBS00KK5

PBIB0077E

Ground Inspection

UBS00JAF

Ground connections are very important to the proper operation of electrical and electronic circuits. Ground connections are often exposed to moisture, dirt and other corrosive elements. The corrosion (rust) can become an unwanted resistance. This unwanted resistance can change the way a circuit works. Electronically controlled circuits are very sensitive to proper grounding. A loose or corroded ground can drastically affect an electronically controlled circuit. A poor or corroded ground can easily affect the circuit. Even when the ground connection looks clean, there can be a thin film of rust on the surface. When inspecting a ground connection follow these rules:
G Remove the ground bolt or screw.
G Inspect all mating surfaces for tarnish, dirt, rust, etc.
G Clean as required to assure good contact.
G Reinstall bolt or screw securely.
G Inspect for "add-on" accessories which may be interfering with the ground circuit.
G If several wires are crimped into one ground eyelet terminal, check for proper crimps. Make sure all of the wires are clean, securely fastened and providing a good ground path. If multiple wires are cased in one eyelet make sure no ground wires have excess wire insulation.
For detailed ground distribution information, refer to PG-13, "Ground Distribution" .

Revision: December 2006

EC-742

PBIB1870E
2006 Sentra

DTC U1000, U1001 CAN COMMUNICATION LINE

[QR25DE]

DTC U1000, U1001 CAN COMMUNICATION LINE Description

PFP:23710
A
UBS00JAG

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec- EC

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.

Each control unit transmits/receives data but selectively reads required data only.

C

On Board Diagnosis Logic

UBS00JAH

DTC No.

Trouble diagnosis name

DTC detecting condition

D
Possible cause

U1000*1 1000*1
U1001*2 1001*2

CAN communication line

G ECM cannot communicate to other control units.
G ECM cannot communicate for more than the specified time.

*1: This self-diagnosis has the one trip detection logic. (A/T models) The MIL will not light up for this diagnosis. (M/T models)
*2: The MIL will not light up for this diagnosis.

DTC Confirmation Procedure

1. Turn ignition switch ON and wait at least 3 seconds. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. If 1st trip DTC is detected, go to EC-745, "Diagnostic Procedure" .

E
G Harness or connectors (CAN communication line is open or shorted)
F
G
UBS00JAI
H

I

J

K

L

M

Revision: December 2006

EC-743

2006 Sentra

DTC U1000, U1001 CAN COMMUNICATION LINE Wiring Diagram

[QR25DE]
UBS00JAJ

Revision: December 2006

EC-744

BBWA0274E
2006 Sentra

DTC U1000, U1001 CAN COMMUNICATION LINE
Diagnostic Procedure
Go to LAN-14, "CAN COMMUNICATION" .

[QR25DE]
UBS00JAK
A EC
C D E F G H I J K L M

Revision: December 2006

EC-745

2006 Sentra

DTC U1010 CAN COMMUNICATION

[QR25DE]

DTC U1010 CAN COMMUNICATION

PFP:23710

Description

UBS00N96

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

On Board Diagnosis Logic

UBS00N97

This self-diagnosis has the one trip detection logic. (A/T models) The MIL will not light up for this diagnosis. (M/T models)

DTC No.
U1010 1010

Trouble diagnosis name CAN communication bus

DTC detecting condition
Initializing CAN communication bus is malfunctioning.

DTC Confirmation Procedure
WITH CONSULT-II 1. Turn ignition switch ON.
2. Select "DATA MONITOR" mode with CONSULT-II.
3. If DTC is detected, go to EC-747, "Diagnostic Procedure" .

G ECM

Possible cause

UBS00N98

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-746

2006 Sentra

DTC U1010 CAN COMMUNICATION
Diagnostic Procedure
1. INSPECTION START

[QR25DE]
UBS00N99
A

With CONSULT-II

1. Turn ignition switch ON.

EC

2. Select "SELF-DIAG RESULTS" mode with CONSULT-II.

3. Touch "ERASE". C
4. Perform DTC Confirmation Procedure. See EC-746, "DTC Confirmation Procedure" .

5. Is the DTC U1010 displayed again?

D

With GST

1. Turn ignition switch ON.

2. Select Service $04 with GST.

E

3. Perform DTC Confirmation Procedure. See EC-746, "DTC Confirmation Procedure" .

4. Is the DTC U1010 displayed again?

F

Yes or No

Yes >> GO TO 2.

No >> INSPECTION END

G

2. REPLACE ECM

1. Replace ECM.

H

2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to

BL-96, "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM -- NATS)" .

3. Perform EC-670, "VIN Registration" .

I

4. Perform EC-670, "Accelerator Pedal Released Position Learning" .

5. Perform EC-671, "Throttle Valve Closed Position Learning" .

J

6. Perform EC-671, "Idle Air Volume Learning" .

>> INSPECTION END

K

L

M

Revision: December 2006

EC-747

2006 Sentra

DTC P0011 IVT CONTROL

DTC P0011 IVT CONTROL

Description
SYSTEM DESCRIPTION

Sensor

Input signal to ECM

Crankshaft position sensor (POS) Camshaft position sensor (PHASE)

Engine speed

Engine coolant temperature sensor

Engine coolant temperature

Vehicle speed sensor

Vehicle speed*

*: This signal is sent to ECM through CAN communication line.

ECM function
Intake valve timing control

[QR25DE]
PFP:23796
UBS00JAL
Actuator
Intake valve timing control solenoid valve

PBIB3085E
This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake valve. The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing control solenoid valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to increase engine torque in low/mid speed range and output in high-speed range.

CONSULT-II Reference Value in Data Monitor Mode

UBS00JAM

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

INT/V TIM (B1)

G Engine: After warming up G Shift lever: P or N (A/T), Neutral
(M/T) G Air conditioner switch: OFF G No-load

Idle 2,000 rpm

-5° - 5°CA Approx. 0° - 20°CA

INT/V SOL (B1)

G Engine: After warming up G Shift lever: P or N (A/T), Neutral
(M/T) G Air conditioner switch: OFF G No-load

Idle 2,000 rpm

0% - 2% Approx. 25% - 60%

Revision: December 2006

EC-748

2006 Sentra

DTC P0011 IVT CONTROL

[QR25DE]

On Board Diagnosis Logic

DTC No.

Trouble diagnosis name

Detecting condition

Possible cause

UBS00JAN
A

P0011 0011

Intake valve timing control performance

There is a gap between angle of target and phase-control angle degree.

G Crankshaft position sensor (POS)

EC

G Camshaft position sensor (PHASE)

G Intake valve control solenoid valve

G Accumulation of debris to the signal pick-up C
portion of the camshaft

G Timing chain installation

G Foreign matter caught in the oil groove for

D

intake valve timing control

FAIL-SAFE MODE

E

ECM enters fail-safe mode when the malfunction is detected.

Detected items

Engine operating condition in fail-safe mode

Intake valve timing control

The signal is not energized to the solenoid valve and the valve control does not function

F

DTC Confirmation Procedure

UBS00JAO

CAUTION:

G

Always drive at a safe speed.

NOTE: G If DTC P0011 is displayed with DTC P0075, first perform trouble diagnosis for DTC P0075. See EC- H
763, "DTC P0075 IVT CONTROL SOLENOID VALVE" .

G If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait

at least 10 seconds before conducting the next test.

I

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is between 10V and 16V at

idle. J

WITH CONSULT-II

1. Turn ignition switch ON and select "DATA MONITOR" mode with

CONSULT-II.

K

2. Start engine and warm it up to the normal operating tempera-

ture.

3. Maintain the following conditions for at least 6 consecutive sec-

L

onds.

Hold the accelerator pedal as steady as possible.

ENG SPEED

500 - 2,000 rpm (A constant rotation is maintained.)

COOLANT TEMPS

70 - 120°C (158 - 248°F)

B/FUEL SCHDL

More than 4 msec

Selector lever

P or N position (A/T) Neutral position (M/T)

4. Let engine idle for 10 seconds. 5. If the 1st trip DTC is detected, go to EC-750, "Diagnostic Procedure" .
If the 1st trip DTC is not detected, go to next step.
6. Maintain the following conditions for at least 6 consecutive seconds.

M
SEF174Y

ENG SPEED COOLANT TEMPS Selector lever
Driving location uphill

1,800 - 3,175 rpm (A constant rotation is maintained.)
70 - 105°C (158 - 221°F)
1st or 2nd position
Driving vehicle uphill (Increased engine load will help maintain the driving conditions required for this test.)

Revision: December 2006

EC-749

2006 Sentra

DTC P0011 IVT CONTROL
7. If the 1st trip DTC is detected, go to EC-750, "Diagnostic Procedure" . WITH GST
Follow the procedure "WITH CONSULT-II" above.
Diagnostic Procedure
1. CHECK OIL PRESSURE WARNING LAMP
1. Start engine. 2. Check oil pressure warning lamp and confirm it is not illumi-
nated. OK or NG
OK >> GO TO 2. KG >> Go to LU-16, "OIL PRESSURE CHECK" .
2. CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE
Refer to EC-751, "Component Inspection" . OK or NG
OK >> GO TO 3. NG >> Replace intake valve timing control solenoid valve.
3. CHECK CRANKSHAFT POSITION SENSOR (POS)
Refer to EC-915, "Component Inspection" . OK or NG
OK >> GO TO 4. NG >> Replace crankshaft position sensor (POS).
4. CHECK CAMSHAFT POSITION SENSOR (PHASE)
Refer to EC-923, "Component Inspection" . OK or NG
OK >> GO TO 5. NG >> Replace camshaft position sensor (PHASE).
5. CHECK CAMSHAFT (INTAKE)
Check the following. G Accumulation of debris to the signal plate of camshaft rear end G Chipping signal plate of camshaft rear end OK or NG
OK >> GO TO 6. NG >> Remove debris and clean the signal plate of camshaft
rear end or replace camshaft.

Revision: December 2006

EC-750

[QR25DE]
UBS00JAP PBIA8559J
PBIB0565E
2006 Sentra

DTC P0011 IVT CONTROL
6. CHECK TIMING CHAIN INSTALLATION
Check service records for any recent repairs that may cause timing chain misaligned. Are there any service records that may cause timing chain misaligned? Yes or No
Yes >> Check timing chain installation. Refer to EM-136, "TIMING CHAIN" . No >> GO TO 7.
7. CHECK LUBRICATION CIRCUIT

[QR25DE]
A EC
C

Refer to EM-133, "INSPECTION OF CAMSHAFT SPROCKET (INT) OIL GROOVE" .

OK or NG

D

OK >> GO TO 8.
NG >> Clean lubrication line. E
8. CHECK INTERMITTENT INCIDENT

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

F

For Wiring Diagram, refer to EC-912 for CKP sensor (POS) and EC-919 for CMP sensor (PHASE).

>> INSPECTION END
Component Inspection
INTAKE VALVE TIMING CONTROL SOLENOID VALVE 1. Disconnect intake valve timing control solenoid valve harness connector.
2. Check resistance between intake valve timing control solenoid valve as follows.

Terminal 1 and 2 1 or 2 and ground

Resistance
8 [at 20°C (68°F)] 
(Continuity should not exist.)

If NG, replace intake valve timing control solenoid valve. If OK, go to next step.
3. Remove intake valve timing control solenoid valve.

4. Provide 12V DC between intake valve timing control solenoid valve terminals and then interrupt it. Make sure that the plunger moves as shown in the figure.
CAUTION: Do not apply 12V DC continuously for 5 seconds or more. Doing so may result in damage to the coil in intake valve timing control solenoid valve. If NG, replace intake valve timing control solenoid valve.
NOTE: Always replace O-ring when intake valve timing control solenoid valve is removed.
Removal and Installation
INTAKE VALVE TIMING CONTROL SOLENOID VALVE
Refer to EM-136, "TIMING CHAIN" .

G
UBS00JAQ
H I J K
PBIB0193E
L M
PBIB2275E UBS00JAR

Revision: December 2006

EC-751

2006 Sentra

DTC P0031, P0032 A/F SENSOR 1 HEATER

[QR25DE]

DTC P0031, P0032 A/F SENSOR 1 HEATER

PFP:22693

Description
SYSTEM DESCRIPTION

UBS00JH5

Sensor

Input Signal to ECM

ECM function

Actuator

Camshaft position sensor (PHASE) Crankshaft position sensor (POS)
Mass air flow sensor

Engine speed Amount of intake air

Air fuel ratio (A/F) sensor 1 Air fuel ratio (A/F) sensor 1

heater control

heater

The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to the engine operating condition to keep the temperature of A/F sensor 1 element at the specified range.

CONSULT-II Reference Value in Data Monitor Mode

UBS00JH6

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

A/F S1 HTR (B1)

G Engine: After warming up, idle the engine

0 - 100%

On Board Diagnosis Logic

UBS00JH7

DTC No.
P0031 0031
P0032 0032

Trouble diagnosis name
Air fuel ratio (A/F) sensor 1 heater control circuit low
Air fuel ratio (A/F) sensor 1 heater control circuit high

DTC detecting condition

Possible cause

The current amperage in the air fuel ratio (A/F) sensor 1 heater circuit is out of the normal range. (An excessively low voltage signal is sent to ECM through the air fuel ratio (A/F) sensor 1 heater.)

G Harness or connectors (The A/F sensor 1 heater circuit is open or shorted.)
G Air fuel ratio (A/F) sensor 1 heater

The current amperage in the air fuel ratio (A/F) sensor 1 heater circuit is out of the normal range. (An excessively high voltage signal is sent to ECM through the air fuel ratio (A/F) sensor 1 heater.)

G Harness or connectors (The A/F sensor 1 heater circuit is shorted.)
G Air fuel ratio (A/F) sensor 1 heater

DTC Confirmation Procedure

UBS00JH8

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at idle. With CONSULT-II

WITH CONSULT-II

1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.
2. Start engine and run it for at least 10 seconds at idle speed.
3. If 1st trip DTC is detected, go to EC-754, "Diagnostic Procedure" .

WITH GST Follow the procedure WITH CONSULT-II above.

Revision: December 2006

EC-752

SEF058Y
2006 Sentra

DTC P0031, P0032 A/F SENSOR 1 HEATER Wiring Diagram

[QR25DE]
UBS00JH9
A EC
C D E F G H I J K L M

Revision: December 2006

EC-753

BBWA1471E
2006 Sentra

DTC P0031, P0032 A/F SENSOR 1 HEATER

[QR25DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

[Engine is running] G Warm-up condition G Idle speed

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body. Refer to EC-742, "Ground Inspection" .

Approximately 3.1V Approximately 2.6V 2 - 3V 2 - 3V

PBIB1584E

UBS00JHA

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

BBIA0515E

Revision: December 2006

EC-754

2006 Sentra

DTC P0031, P0032 A/F SENSOR 1 HEATER
2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect air fuel ratio (A/F) sensor 1 harness connector. 2. Turn ignition switch ON.

[QR25DE]
A EC

C

3. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 4. NG >> GO TO 3.

D
BBIA0304E
E
F
G

3. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M19, E108 G Harness connectors E10, F48 G Fuse block (J/B) connector M1 G 15A fuse G Harness for open or short between A/F sensor 1 and fuse

H
PBIB1683E
I J K

>> Repair or replace harness or connectors. L
4. CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF.

M

2. Disconnect ECM harness connector.

3. Check harness continuity between ECM terminal 2 and A/F sensor 1 terminal 4. Refer to Wiring Diagram.

Continuity should exist.

4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK A/F SENSOR 1 HEATER

Refer to EC-756, "Component Inspection" .
OK or NG OK >> GO TO 6. NG >> GO TO 7.

Revision: December 2006

EC-755

2006 Sentra

DTC P0031, P0032 A/F SENSOR 1 HEATER
6. CHECK INTERMITTENT INCIDENT

[QR25DE]

Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . OK or NG
OK >> GO TO 7. NG >> Repair or replace.
7. REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace air fuel ratio (A/F) sensor 1.
CAUTION: G Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
G Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> INSPECTION END
Component Inspection
AIR FUEL RATIO (A/F) SENSOR 1 HEATER Check resistance between terminals 3 and 4.
Resistance: 2.3 - 4.3 [at 25°C (77°F)]
Check continuity between terminals 3 and 1, 2, 5, 6, terminals 4 and 1, 2, 5, 6.
Continuity should not exist.
If NG, replace the A/F sensor 1. CAUTION: G Discard any A/F sensor which has been dropped from a
height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one. G Before installing new A/F sensor, clean exhaust system threads using Heated Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

UBS00JHB

Removal and Installation
AIR FUEL RATIO SENSOR HEATER
Refer to EM-113, "EXHAUST MANIFOLD AND THREE WAY CATALYST" .

PBIB1684E UBS00JHC

Revision: December 2006

EC-756

2006 Sentra

DTC P0037, P0038 HO2S2 HEATER

[QR25DE]

DTC P0037, P0038 HO2S2 HEATER
Description
SYSTEM DESCRIPTION

PFP:226A0
A
UBS00JTK

Sensor Camshaft position sensor (PHASE) Crankshaft position sensor (POS)
Engine coolant temperature sensor

Input Signal to ECM

ECM Function

Actuator

EC

Engine speed

Engine coolant tempera-

Heated oxygen sensor 2 heater control

Heated oxygen sensor 2 heater

C

ture

Mass air flow sensor

Amount of intake air

D The ECM performs ON/OFF control of the heated oxygen sensor 2 heater corresponding to the engine speed,

amount of intake air and engine coolant temperature.

OPERATION

E

Engine speed rpm

Heated oxygen sensor 2 heater

Above 3,600 Below 3,600 rpm after the following conditions are met.

OFF
F

G Engine: After warming up

ON

G Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load

G

CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.

UBS00JTL
H

MONITOR ITEM

CONDITION

SPECIFICATION

G Engine speed: Below 3,600 rpm after the following conditions

I

are met

­ Engine: After warming up

ON

HO2S2 HTR (B1)

­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load.

J

G Engine speed: Above 3,600 rpm

OFF

On Board Diagnosis Logic

UBS00JTM

K

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

The current amperage in the heated oxygen sensor G Harness or connectors

L

P0037 Heated oxygen sensor 2 2 heater circuit is out of the normal range.

(The heated oxygen sensor 2 heater

0037

heater control circuit low (An excessively low voltage signal is sent to ECM

circuit is open or shorted.)

through the heated oxygen sensor 2 heater.)

G Heater oxygen sensor 2 heater

M
The current amperage in the heated oxygen sensor G Harness or connectors

P0038 Heated oxygen sensor 2 2 heater circuit is out of the normal range.

(The heated oxygen sensor 2 heater

0038

heater control circuit high (An excessively high voltage signal is sent to ECM circuit is shorted.)

through the heated oxygen sensor 2 heater.)

G Heater oxygen sensor 2 heater

DTC Confirmation Procedure

UBS00JTN

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at idle.

WITH CONSULT-II 1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II. 2. Start engine and warm it up to the normal operating temperature. 3. Turn ignition switch OFF and wait at least 10 seconds.

Revision: December 2006

EC-757

2006 Sentra

DTC P0037, P0038 HO2S2 HEATER
4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 1 minute. 6. If 1st trip DTC is detected, go to EC-760, "Diagnostic Procedure"
.
WITH GST Follow the procedure "WITH CONSULT-II" above.

[QR25DE]
SEF174Y

Revision: December 2006

EC-758

2006 Sentra

Wiring Diagram

DTC P0037, P0038 HO2S2 HEATER

[QR25DE]
UBS00JTO
A EC
C D E F G H I J K L M

Revision: December 2006

EC-759

BBWA1389E
2006 Sentra

DTC P0037, P0038 HO2S2 HEATER

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

25 W/B

Heated oxygen sensor 2 heater

[Engine is running]
G Engine speed: Below 3,600 rpm after the following conditions are met.
­ Engine: After warming up
­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load

0 - 1.0V

[Ignition switch: ON] G Engine stopped [Engine is running] G Engine speed: Above 3,600 rpm.

BATTERY VOLTAGE (11 - 14V)

74 R/L

Heated oxygen sensor 2

[Engine is running]
G Revving engine from idle to 3,000 rpm quickly after the following conditions are met.
­ Engine: After warming up
­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load

0 - Approximately 1.0V

78 B

Sensor ground (Heated oxygen sensor 2)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS00JTP

1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body. Refer to EC-742, "Ground Inspection" .

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-760

BBIA0515E
2006 Sentra

DTC P0037, P0038 HO2S2 HEATER
2. CHECK HO2S2 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor 2 harness connector. 2. Turn ignition switch ON.

[QR25DE]
A EC

C

3. Check voltage between HO2S2 terminal 3 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 4. NG >> GO TO 3.

D
BBIA0175E
E
F
G

3. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M19, E108 G Harness connectors E10, F48 G Fuse block (J/B) connector M1 G 15A fuse G Harness for open or short between heated oxygen sensor 2 and fuse

H
PBIB0112E
I J K

>> Repair open circuit or short to ground or short to power in harness or connectors. L
4. CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

M

2. Disconnect ECM harness connector.

3. Check harness continuity between ECM terminal 25 and HO2S2 terminal 2. Refer to Wiring Diagram.

Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK HEATED OXYGEN SENSOR 2 HEATER

Refer to EC-762, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> Replace heated oxygen sensor 2.

Revision: December 2006

EC-761

2006 Sentra

DTC P0037, P0038 HO2S2 HEATER

6. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
HEATED OXYGEN SENSOR 2 HEATER 1. Check resistance between HO2S2 terminals as follows.

Terminal No.

Resistance

2 and 3

5.0 - 7.0  [at 25°C (77°F)]

1 and 2, 3, 4 4 and 1, 2, 3

  (Continuity should not exist)

2. If NG, replace heated oxygen sensor 2.
CAUTION: G Discard any heated oxygen sensor which has been dropped
from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
G Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-4389718 or J-43897-12 and approved anti-seize lubricant.

[QR25DE]
UBS00JTQ

Removal and Installation
HEATED OXYGEN SENSOR 2
Refer to EM-113, "Removal and Installation" .

PBIB0542E UBS00JTR

Revision: December 2006

EC-762

2006 Sentra

DTC P0075 IVT CONTROL SOLENOID VALVE
DTC P0075 IVT CONTROL SOLENOID VALVE
Component Description
Intake valve timing control solenoid valve is activated by ON/OFF pulse duty (ratio) signals from the ECM. The intake valve timing control solenoid valve changes the oil amount and direction of flow through intake valve timing control unit or stops oil flow. The longer pulse width advances valve angle. The shorter pulse width retards valve angle. When ON and OFF pulse widths become equal, the solenoid valve stops oil pressure flow to fix the intake valve angle at the control position.

[QR25DE]
PFP:23796
A
UBS00JHI
EC
C
D

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

CONDITION

INT/V SOL (B1)

G Engine: After warming up G Shift lever: P or N (A/T), Neutral
(M/T) G Air conditioner switch: OFF G No-load

Idle 2,000 rpm

On Board Diagnosis Logic

PBIB1842E
E
UBS00JHJ

SPECIFICATION

F

0% - 2%

G
Approx. 25% - 60%

H
UBS00JHK

DTC No. Trouble diagnosis name

DTC detecting condition

P0075 0075

Intake valve timing con- An improper voltage is sent to the ECM

trol solenoid valve cir- through intake valve timing control solenoid

cuit

valve.

Possible cause
I
G Harness or connectors (Intake valve timing control solenoid valve circuit is open or shorted.)
G Intake valve timing control solenoid valve J

DTC Confirmation Procedure

UBS00JHL

NOTE:

K

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and

wait at least 10 seconds before conducting the next test.

WITH CONSULT-II

L

1. Turn ignition switch ON.

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Start engine and let it idle for 5 seconds.

M

4. If 1st trip DTC is detected, go to EC-766, "Diagnostic Procedure" .

WITH GST Following the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-763

2006 Sentra

DTC P0075 IVT CONTROL SOLENOID VALVE Wiring Diagram

[QR25DE]
UBS00JHM

Revision: December 2006

EC-764

BBWA1465E
2006 Sentra

DTC P0075 IVT CONTROL SOLENOID VALVE

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION
[Engine is running] G Warm-up condition G Idle speed

DATA (DC Voltage)
C
BATTERY VOLTAGE (11 - 14V)
D

7 - 10V

11 G/Y

Intake valve timing control solenoid valve

[Engine is running]

E

G Warm-up condition G Engine speed: 2,500 rpm
F

111 W/G

ECM relay (Self shut-off)

119 120

R/G

Power supply for ECM

PBIB1790E

[Engine is running]

[Ignition switch: OFF]

G

0 - 1.0V

G For a few seconds after turning ignition

switch OFF

[Ignition switch: OFF]

H

BATTERY VOLTAGE

G More than a few seconds after turning (11 - 14V)

ignition switch OFF

[Ignition switch: ON]

BATTERY VOLTAGE

I

(11 - 14V)

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
J

K

L

M

Revision: December 2006

EC-765

2006 Sentra

DTC P0075 IVT CONTROL SOLENOID VALVE

[QR25DE]

Diagnostic Procedure
1. CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

UBS00JHN

1. Turn ignition switch OFF. 2. Disconnect intake valve timing control solenoid valve harness
connector.
3. Turn ignition switch ON.

4. Check voltage between intake valve timing control solenoid valve terminal 2 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 2. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

BBIA0018E

PBIB0192E
2. CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR
OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 11 and intake valve timing control solenoid valve termi-
nal 1. Refer to Wiring Diagram.
Continuity should exist. 4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
3. CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE
Refer to EC-767, "Component Inspection" . OK or NG
OK >> GO TO 4. NG >> Replace intake valve timing control solenoid valve.
4. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END

Revision: December 2006

EC-766

2006 Sentra

DTC P0075 IVT CONTROL SOLENOID VALVE

Component Inspection
INTAKE VALVE TIMING CONTROL SOLENOID VALVE 1. Disconnect intake valve timing control solenoid valve harness connector.
2. Check resistance between intake valve timing control solenoid valve as follows.

Terminal 1 and 2
1 or 2 and ground

Resistance
Approximately 8  [at 20°C (68°F)]
 (Continuity should not exist.)

If NG, replace intake valve timing control solenoid valve. If OK, go to next step.
3. Remove intake valve timing control solenoid valve.

4. Provide 12V DC between intake valve timing control solenoid valve terminals and then interrupt it. Make sure that the plunger moves as shown in the figure.
CAUTION: Do not apply 12V DC continuously for 5 seconds or more. Doing so may result in damage to the coil in intake valve timing control solenoid valve. If NG, replace intake valve timing control solenoid valve.
NOTE: Always replace O-ring when intake valve timing control solenoid valve is removed.
Removal and Installation
INTAKE VALVE TIMING CONTROL SOLENOID VALVE
Refer to EM-136, "TIMING CHAIN" .

[QR25DE]
UBS00JHO
A

EC

C

D
PBIB0193E
E

F

G

H
PBIB2275E

UBS00JHP

I

J

K L

M

Revision: December 2006

EC-767

2006 Sentra

DTC P0101 MAF SENSOR
DTC P0101 MAF SENSOR
Component Description
The mass air flow sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. The mass air flow sensor controls the temperature of the hot wire to a certain amount. The heat generated by the hot wire is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the electric current supplied to hot wire is changed to maintain the temperature of the hot wire as air flow increases. The ECM detects the air flow by means of this current change.

[QR25DE]
PFP:22680
UBS00JB0

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

CONDITION

MAS A/F SE-B1

G See EC-725, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .

CAL/LD VALUE

G Engine: After warming up G Shift lever: P or N (A/T), Neutral
(M/T) G Air conditioner switch: OFF G No-load

Idle 2,500 rpm

MASS AIRFLOW

G Engine: After warming up G Shift lever: P or N (A/T), Neutral
(M/T) G Air conditioner switch: OFF G No-load

Idle 2,500 rpm

On Board Diagnosis Logic

PBIB1604E UBS00JB1
SPECIFICATION 10% - 35% 10% - 35% 1.0 - 4.0 g·m/s 4.0 - 10.0 g·m/s
UBS00JB2

DTC No. Trouble diagnosis name

A)

P0101 0101

Mass air flow sensor circuit range/performance

B)

DTC detecting condition
A high voltage from the sensor is sent to ECM under light load driving condition.
A low voltage from the sensor is sent to ECM under heavy load driving condition.

Possible cause
G Harness or connectors (The sensor circuit is open or shorted.)
G Mass air flow sensor G EVAP control system pressure
sensor G Intake air temperature sensor
G Harness or connectors (The sensor circuit is open or shorted.)
G Intake air leaks G Mass air flow sensor G EVAP control system pressure
sensor G Intake air temperature sensor

Revision: December 2006

EC-768

2006 Sentra

DTC P0101 MAF SENSOR

[QR25DE]

DTC Confirmation Procedure
Perform PROCEDURE FOR MALFUNCTION A first. If the DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.

UBS00JB3
A

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

EC

least 10 seconds before conducting the next test.

PROCEDURE FOR MALFUNCTION A

C

NOTE:

If engine will not start or stops soon, wait at least 10 seconds with engine stopped (Ignition switch ON) instead

of running engine at idle speed. D

With CONSULT-II

1. Turn ignition switch ON.

2. Select "DATA MONITOR" mode with CONSULT-II.

E

3. Start engine and warm it up to normal operating temperature.

4. Run engine for at least 10 seconds at idle speed.

5. If 1st trip DTC is detected, go to EC-772, "Diagnostic Procedure"

F

.

G

With GST Follow the procedure "With CONSULT-II" above.
PROCEDURE FOR MALFUNCTION B CAUTION: Always drive vehicle at a safe speed.
With CONSULT-II 1. Turn ignition switch ON. 2. Start engine and warm it up to normal operating temperature.
If engine cannot be started, go to EC-772, "Diagnostic Procedure" . 3. Select "DATA MONITOR" mode with CONSULT-II. 4. Check the voltage of "MAS A/F SE-B1" with "DATA MONITOR". 5. Increases engine speed to about 4,000 rpm. 6. Monitor the linear voltage rise in response to engine speed
increases. If NG, go to EC-772, "Diagnostic Procedure" . If OK, go to following step.

SEF174Y

H

I

J

K

L

M

Revision: December 2006

EC-769

SEF243Y
2006 Sentra

DTC P0101 MAF SENSOR

[QR25DE]

7. Maintain the following conditions for at least 10 consecutive seconds.

ENG SPEED

More than 2,000 rpm

THRTL SEN 1

More than 3V

THRTL SEN 2

More than 3V

Shift lever

Suitable position

Driving location

Driving vehicle uphill (Increased engine load) will help maintain the driving conditions required for this test.

8. If 1st trip DTC is detected, go to EC-772, "Diagnostic Procedure" .

PBIB0199E

Overall Function Check
PROCEDURE FOR MALFUNCTION B

UBS00JB4

Use this procedure to check the overall function of the mass air flow sensor circuit. During this check, a 1st trip DTC might not be confirmed.

With GST 1. Start engine and warm it up to normal operating temperature. 2. Select Service $01 with GST. 3. Check the mass air flow sensor signal with Service $01. 4. Check for linear mass air flow sensor signal value rise in
response to increases to about 4,000 rpm in engine speed. 5. If NG, go to EC-772, "Diagnostic Procedure" .

SEF534P

Revision: December 2006

EC-770

2006 Sentra

Wiring Diagram

DTC P0101 MAF SENSOR

[QR25DE]
UBS00JB5
A EC
C D E F G H I J K L M

Revision: December 2006

EC-771

BBWA2152E
2006 Sentra

DTC P0101 MAF SENSOR

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

51 L/R 67 B/W

Mass air flow sensor
Sensor ground (MAF sensor, IAT sensor, ECT sensor, EVAP control system pressure sensor, PSP sensor, ASCD steering switch, Refrigerant pressure sensor)

[Engine is running] G Warm-up condition G Idle speed [Engine is running] G Warm-up condition G Engine speed: 2,500 rpm.
[Engine is running] G Warm-up condition G Idle speed

0.9 - 1.1V 1.5 - 1.8V Approximately 0V

111 W/G

ECM relay (Self shut-off)

119 120

R/G

Power supply for ECM

[Engine is running] [Ignition switch: OFF] G For a few seconds after turning ignition
switch OFF
[Ignition switch: OFF] G More than a few seconds after turning
ignition switch OFF
[Ignition switch: ON]

0 - 1.0V
BATTERY VOLTAGE (11 - 14V) BATTERY VOLTAGE (11 - 14V)

Diagnostic Procedure
1. INSPECTION START

UBS00JB6

Which malfunction (A or B) is duplicated?

A or B

A

>> GO TO 3.

B

>> GO TO 2.

2. CHECK INTAKE AIR LEAK

Check the following for connections. G Air duct G Vacuum hoses G Intake air passage between air duct and intake manifold OK or NG
OK >> GO TO 3. NG >> Reconnect the parts.

Revision: December 2006

EC-772

2006 Sentra

DTC P0101 MAF SENSOR
3. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body.
Refer to EC-742, "Ground Inspection" .
OK or NG OK >> GO TO 4. NG >> Repair or replace ground connections.
4. CHECK MAF SENSOR POWER SUPPLY CIRCUIT
1. Disconnect mass air flow (MAF) sensor harness connector. 2. Turn ignition switch ON.
3. Check voltage between MAF sensor terminal 2 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 6. NG >> GO TO 5.

[QR25DE]
A EC
C D E
BBIA0515E
F G H I J
BBIA0130E
K L M

5. DETECT MALFUNCTIONING PART
Check the following. G Harness for open or short between mass air flow sensor and ECM relay G Harness for open or short between mass air flow sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB2580E

Revision: December 2006

EC-773

2006 Sentra

DTC P0101 MAF SENSOR
6. CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Disconnect TCM harness connector (A/T models). 4. Check harness continuity between the following;
MAF sensor terminal 3 and ECM terminal 67, MAF sensor terminal 3 and TCM terminal 42 (A/T models). Refer to Wiring Diagram.
Continuity should exist. 5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 8. NG >> GO TO 7.
7. DETECT MALFUNCTIONING PART
Check the following. G Harness for open or short between mass air flow sensor and ECM. G Harness for open or short between mass air flow sensor and TCM (A/T models).

[QR25DE]

>> Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between MAF sensor terminal 4 and ECM terminal 51. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK INTAKE AIR TEMPERATURE SENSOR
Refer to EC-790, "Component Inspection" . OK or NG
OK >> GO TO 10. NG >> Replace intake air temperature sensor.
10. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-975, "Component Inspection" . OK or NG
OK >> GO TO 11. NG >> Replace EVAP control system pressure sensor.
11. CHECK MASS AIR FLOW SENSOR
Refer to EC-775, "Component Inspection" . OK or NG
OK >> GO TO 12. NG >> Replace mass air flow sensor.

Revision: December 2006

EC-774

2006 Sentra

DTC P0101 MAF SENSOR

12. CHECK INTERMITTENT INCIDENT
Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
MASS AIR FLOW SENSOR With CONSULT-II
1. Reconnect all harness connectors disconnected. 2. Start engine and warm it up to normal operating temperature. 3. Connect CONSULT-II and select "DATA MONITOR" mode. 4. Select "MAS A/F SE-B1" and check indication under the follow-
ing conditions.

Condition

MAS A/F SE-B1 (V)

Ignition switch ON (Engine stopped.)

Approx 0.4

Idle (Engine is warmed-up to normal operating temperature.)

0.9 - 1.1

2,500 rpm (Engine is warmed-up to normal operating temperature.)

1.5 - 1.8

Idle to about 4,000 rpm

0.9 - 1.1 to 2.4*

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
5. If the voltage is out of specification, proceed the following. a. Check for the cause of uneven air flow through mass air flow sensor. Refer to following.
G Crushed air ducts G Malfunctioning seal of air cleaner element G Uneven dirt of air cleaner element G Improper specification of intake air system parts b. If NG, repair or replace malfunctioning part and perform step 2 to 4 again. If OK, go to next step. 6. Turn ignition switch OFF. 7. Disconnect mass air flow sensor harness connector and reconnect it again. 8. Perform step 2 to 4 again. 9. If NG, clean or replace mass air flow sensor.

Without CONSULT-II 1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature. 3. Check voltage between ECM terminal 51 (Mass air flow sensor
signal) and ground.

Condition

Voltage V

Ignition switch ON (Engine stopped.)

Approx 0.4

Idle (Engine is warmed-up to normal operating temperature.)

0.9 - 1.1

2,500 rpm (Engine is warmed-up to normal operating temperature.)

1.5 - 1.8

Idle to about 4,000 rpm

0.9 - 1.1 to 2.4*

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
4. If the voltage is out of specification, proceed the following.

Revision: December 2006

EC-775

[QR25DE]
A EC
UBS00JB7
C D E F G
PBIB2371E
H I J K L M
PBIB1106E
2006 Sentra

DTC P0101 MAF SENSOR
a. Check for the cause of uneven air flow through mass air flow sensor. Refer to following. G Crushed air ducts G Malfunctioning seal of air cleaner element G Uneven dirt of air cleaner element G Improper specification of intake air system parts
b. If NG, repair or replace malfunctioning part and perform step 2 to 3 again. If OK, go to next step.
5. Turn ignition switch OFF. 6. Disconnect mass air flow sensor harness connector and reconnect it again. 7. Perform step 2 and 3 again. 8. If NG, clean or replace mass air flow sensor.
Removal and Installation
MASS AIR FLOW SENSOR Refer to EM-106, "AIR CLEANER AND AIR DUCT" .

[QR25DE]
UBS00JB8

Revision: December 2006

EC-776

2006 Sentra

DTC P0102, P0103 MAF SENSOR
DTC P0102, P0103 MAF SENSOR
Component Description
The mass air flow sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. The mass air flow sensor controls the temperature of the hot wire to a certain amount. The heat generated by the hot wire is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the electric current supplied to hot wire is changed to maintain the temperature of the hot wire as air flow increases. The ECM detects the air flow by means of this current change.

[QR25DE]
PFP:22680
A
UBS00JB9
EC
C
D

CONSULT-II Reference Value in Data Monitor Mode

PBIB1604E
E
UBS00JBA

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

F

MAS A/F SE-B1

G See EC-725, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .

CAL/LD VALUE

G Engine: After warming up G Shift lever: P or N (A/T), Neutral
(M/T) G Air conditioner switch: OFF G No-load

Idle 2,500 rpm

10% - 35%
G
10% - 35%
H

MASS AIRFLOW

G Engine: After warming up G Shift lever: P or N (A/T), Neutral
(M/T) G Air conditioner switch: OFF G No-load

Idle 2,500 rpm

On Board Diagnosis Logic

1.0 - 4.0 g·m/s 4.0 - 10.0 g·m/s

I
J
UBS00JBB

These self-diagnoses have the one trip detection logic.

DTC No.

Trouble diagnosis name

DTC detecting condition

K
Possible cause

G Harness or connectors

P0102 Mass air flow sensor An excessively low voltage from the sensor is

(The sensor circuit is open or shorted.)

L

0102

circuit low input

sent to ECM.

G Intake air leaks

G Mass air flow sensor

G Harness or connectors

M

P0103 Mass air flow sensor An excessively high voltage from the sensor is

(The sensor circuit is open or shorted.)

0103

circuit high input

sent to ECM.

G Mass air flow sensor

FAIL-SAFE MODE When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

Detected items

Engine operating condition in fail-safe mode

Mass air flow sensor circuit

Engine speed will not rise more than 2,400 rpm due to the fuel cut.

Revision: December 2006

EC-777

2006 Sentra

DTC P0102, P0103 MAF SENSOR

[QR25DE]

DTC Confirmation Procedure

UBS00JBC

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

PROCEDURE FOR DTC P0102 With CONSULT-II
1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and wait at least 5 seconds. 4. If DTC is detected, go to EC-780, "Diagnostic Procedure" .

With GST Follow the procedure "With CONSULT-II" above. PROCEDURE FOR DTC P0103
With CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Wait at least 5 seconds. 4. If DTC is detected, go to EC-780, "Diagnostic Procedure" .
If DTC is not detected, go to next step. 5. Start engine and wait at least 5 seconds. 6. If DTC is detected, go to EC-780, "Diagnostic Procedure" .
With GST Follow the procedure "With CONSULT-II" above.

SEF058Y SEF058Y

Revision: December 2006

EC-778

2006 Sentra

Wiring Diagram

DTC P0102, P0103 MAF SENSOR

[QR25DE]
UBS00JBD
A EC
C D E F G H I J K L M

Revision: December 2006

EC-779

BBWA2152E
2006 Sentra

DTC P0102, P0103 MAF SENSOR

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

51 L/R 67 B/W

Mass air flow sensor
Sensor ground (MAF sensor, IAT sensor, ECT sensor, EVAP control system pressure sensor, PSP sensor, ASCD steering switch, Refrigerant pressure sensor)

[Engine is running] G Warm-up condition G Idle speed [Engine is running] G Warm-up condition G Engine speed: 2,500 rpm.
[Engine is running] G Warm-up condition G Idle speed

0.9 - 1.1V 1.5 - 1.8V Approximately 0V

111 W/G

ECM relay (Self shut-off)

119 120

R/G

Power supply for ECM

[Engine is running] [Ignition switch: OFF] G For a few seconds after turning ignition
switch OFF
[Ignition switch: OFF] G More than a few seconds after turning
ignition switch OFF
[Ignition switch: ON]

0 - 1.0V
BATTERY VOLTAGE (11 - 14V) BATTERY VOLTAGE (11 - 14V)

Diagnostic Procedure
1. INSPECTION START

UBS00JBE

Which malfunction (P0102 or P0103) is duplicated? P0102 or P0103
P0102 >> GO TO 2. P0103 >> GO TO 3.
2. CHECK INTAKE SYSTEM

Check the following for connections. G Air duct G Vacuum hoses G Intake air passage between air duct and intake manifold OK or NG
OK >> GO TO 3. NG >> Reconnect the parts.

Revision: December 2006

EC-780

2006 Sentra

DTC P0102, P0103 MAF SENSOR
3. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body.
Refer to EC-742, "Ground Inspection" .
OK or NG OK >> GO TO 4. NG >> Repair or replace ground connections.
4. CHECK MAF SENSOR POWER SUPPLY CIRCUIT
1. Disconnect mass air flow (MAF) sensor harness connector. 2. Turn ignition switch ON.
3. Check voltage between MAF sensor terminal 2 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 6. NG >> GO TO 5.

[QR25DE]
A EC
C D E
BBIA0515E
F G H I J
BBIA0130E
K L M

5. DETECT MALFUNCTIONING PART
Check the following. G Harness for open or short between ECM relay and mass air flow sensor G Harness for open or short between mass air flow sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB2580E

Revision: December 2006

EC-781

2006 Sentra

DTC P0102, P0103 MAF SENSOR
6. CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Disconnect TCM harness connector (A/T models). 4. Check harness continuity between the following;
MAF sensor terminal 3 and ECM terminal 67, MAF sensor terminal 3 and TCM terminal 42 (A/T models). Refer to Wiring Diagram.
Continuity should exist. 5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 8. NG >> GO TO 7.
7. DETECT MALFUNCTIONING PART
Check the following. G Harness for open or short between mass air flow sensor and ECM G Harness for open or short between mass air flow sensor and TCM (A/T models)

[QR25DE]

>> Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR POEN AND SHORT
1. Check harness continuity between MAF sensor terminal 4 and ECM terminal 51. Refer to Wiring Diagram.
Continuity should exist. 2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK MASS AIR FLOW SENSOR
Refer to EC-782, "Component Inspection" . OK or NG
OK >> GO TO 10. NG >> Replace mass air flow sensor.
10. CHECK INTERMITTENT INCIDENT
Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
MASS AIR FLOW SENSOR With CONSULT-II
1. Reconnect all harness connectors disconnected. 2. Start engine and warm it up to normal operating temperature. 3. Connect CONSULT-II and select "DATA MONITOR" mode.

UBS00JBF

Revision: December 2006

EC-782

2006 Sentra

DTC P0102, P0103 MAF SENSOR

4. Select "MAS A/F SE-B1" and check indication under the following conditions.

Condition

MAS A/F SE-B1 (V)

Ignition switch ON (Engine stopped.)

Approx 0.4

Idle (Engine is warmed-up to normal operating temperature.)

0.9 - 1.1

2,500 rpm (Engine is warmed-up to normal operating temperature.)

1.5 - 1.8

Idle to about 4,000 rpm

0.9 - 1.1 to 2.4*

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
5. If the voltage is out of specification, proceed the following. a. Check for the cause of uneven air flow through mass air flow sensor. Refer to following.
G Crushed air ducts G Malfunctioning seal of air cleaner element G Uneven dirt of air cleaner element G Improper specification of intake air system parts b. If NG, repair or replace malfunctioning part and perform step 2 to 4 again. If OK, go to next step. 6. Turn ignition switch OFF. 7. Disconnect mass air flow sensor harness connector and reconnect it again. 8. Perform step 2 to 4 again. 9. If NG, clean or replace mass air flow sensor.

Without CONSULT-II 1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Check voltage between ECM terminal 51 (Mass air flow sensor signal) and ground.

Condition

Voltage V

Ignition switch ON (Engine stopped.)

Approx 0.4

Idle (Engine is warmed-up to normal operating temperature.)

0.9 - 1.1

2,500 rpm (Engine is warmed-up to normal operating temperature.)

1.5 - 1.8

Idle to about 4,000 rpm

0.9 - 1.1 to 2.4*

*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.

4. If the voltage is out of specification, proceed the following. a. Check for the cause of uneven air flow through mass air flow sensor. Refer to following.
G Crushed air ducts G Malfunctioning seal of air cleaner element G Uneven dirt of air cleaner element G Improper specification of intake air system parts b. If NG, repair or replace malfunctioning part and perform step 2 to 3 again. If OK, go to next step. 5. Turn ignition switch OFF. 6. Disconnect mass air flow sensor harness connector and reconnect it again. 7. Perform step 2 and 3 again. 8. If NG, clean or replace mass air flow sensor.

Revision: December 2006

EC-783

[QR25DE]
A EC
C
PBIB2371E
D E F G H I J K L M
PBIB1106E
2006 Sentra

DTC P0102, P0103 MAF SENSOR
Removal and Installation
MASS AIR FLOW SENSOR Refer to EM-106, "AIR CLEANER AND AIR DUCT" .

[QR25DE]
UBS00JBG

Revision: December 2006

EC-784

2006 Sentra

DTC P0112, P0113 IAT SENSOR
DTC P0112, P0113 IAT SENSOR Component Description
The intake air temperature sensor is built into mass air flow sensor. The sensor detects intake air temperature and transmits a signal to the ECM. The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rise.

[QR25DE]
PFP:22630
A
UBS00JBH
EC
C

D

<Reference data>

PBIB1604E
E

Intake air temperature °C (°F)

Voltage* V

Resistance k

25 (77)

3.3

1.800 - 2.200

80 (176)

1.2

0.283 - 0.359

*: This data is reference value and is measured between ECM terminal 34 (Intake air temperature sensor) and ground.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis Logic

F
G
H
SEF012P
I
UBS00JBI

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

J

P0112 0112

Intake air temperature sensor circuit low input

An excessively low voltage from the sensor is sent to ECM.

G Harness or connectors

K

(The sensor circuit is open or shorted.)

P0113 0113

Intake air temperature sensor circuit high input

An excessively low voltage from the sensor is sent to ECM.

G Intake air temperature sensor

L

DTC Confirmation Procedure

UBS00JBJ

NOTE:

M

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Wait at least 5 seconds. 4. If 1st trip DTC is detected, go to EC-788, "Diagnostic Procedure"
.

Revision: December 2006

EC-785

SEF058Y
2006 Sentra

DTC P0112, P0113 IAT SENSOR
WITH GST Follow the procedure "WITH CONSULT-II" above.

[QR25DE]

Revision: December 2006

EC-786

2006 Sentra

Wiring Diagram

DTC P0112, P0113 IAT SENSOR

[QR25DE]
UBS00JBK
A EC
C D E F G H I J K L M

Revision: December 2006

EC-787

BBWA2153E
2006 Sentra

DTC P0112, P0113 IAT SENSOR
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body.
Refer to EC-742, "Ground Inspection" .

[QR25DE]
UBS00JBL

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY
1. Disconnect mass air flow sensor (intake air temperature sensor is built-into) sensor harness connector.
2. Turn ignition switch ON.
3. Check voltage between MAF sensor terminal 5 and ground with CONSULT-II or tester. Voltage: Approximately 5V
OK or NG OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

BBIA0515E BBIA0130E PBIB2581E

Revision: December 2006

EC-788

2006 Sentra

DTC P0112, P0113 IAT SENSOR

[QR25DE]

3. CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT A

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Disconnect TCM harness connector (A/T models).

EC

4. Check harness continuity between mass air flow sensor terminal 6 and ECM terminal 67, TCM terminal 42

(A/T models).

Refer to wiring diagram.

C

Continuity should exist.

5. Also check harness for short to ground and short to power.

D

OK or NG

OK >> GO TO 5.

NG >> GO TO 4.

E

4. DETECT MALFUNCTIONING PART

Check the following.

F

G Harness for open or short between TCM and MAF sensor (A/T models).

G Harness for open or short between ECM and MAF sensor. G

>> Repair open circuit or short to ground or short to power in harness or connectors.

5. CHECK INTAKE AIR TEMPERATURE SENSOR

H

Refer to EC-790, "Component Inspection" .

OK or NG

I

OK >> GO TO 6.

NG >> Replace mass air flow sensor (with intake temperature sensor).

6. CHECK INTERMITTENT INCIDENT

J

Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . K

>> INSPECTION END L

M

Revision: December 2006

EC-789

2006 Sentra

DTC P0112, P0113 IAT SENSOR

Component Inspection
INTAKE AIR TEMPERATURE SENSOR
1. Check resistance between intake air temperature sensor terminals 5 and 6 under the following conditions.

Intake air temperature °C (°F)

Resistance k

25 (77)

1.800 - 2.200

2. If NG, replace mass air flow sensor (with intake air temperature sensor).

[QR25DE]
UBS00JBM
PBIB1604E

Removal and Installation
MASS AIR FLOW SENSOR
Refer to EM-106, "AIR CLEANER AND AIR DUCT" .

SEF012P UBS00JBN

Revision: December 2006

EC-790

2006 Sentra

DTC P0117, P0118 ECT SENSOR
DTC P0117, P0118 ECT SENSOR Component Description
The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

[QR25DE]
PFP:22630
A
UBS00JBO
EC
C

D

<Reference data>

SEF594K
E

Engine coolant temperature °C (°F)

Voltage* V

Resistance k

F

-10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.1 - 2.9

G

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

*: These data are reference values and are measured between ECM terminal 73 (Engine coolant temperature sensor) and ground.

H
SEF012P

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

I

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

On Board Diagnosis Logic
These self-diagnoses have the one trip detection logic.

UBS00JBP

J

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

K

P0117 0117

Engine coolant temperature sensor circuit low input

An excessively low voltage from the sensor is sent to ECM.

G Harness or connectors

L

Engine coolant

(The sensor circuit is open or shorted.)

P0118

temperature sen- An excessively high voltage from the sensor is G Engine coolant temperature sensor

0118

sor circuit high input

sent to ECM.

M

FAIL-SAFE MODE When this malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

Revision: December 2006

EC-791

2006 Sentra

DTC P0117, P0118 ECT SENSOR

[QR25DE]

Detected items

Engine operating condition in fail-safe mode

Engine coolant temperature will be determined by ECM based on the time after turning ignition switch ON or START. CONSULT-II displays the engine coolant temperature decided by ECM.

Condition

Engine coolant temperature decided (CONSULT-II display)

Engine coolant temperature sensor circuit

Just as ignition switch is turned ON or START
More than approx. 4 minutes after ignition ON or START

40°C (104°F) 80°C (176°F)

Except as shown above

40 - 80°C (104 - 176°F) (Depends on the time)

When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates while engine is running.

DTC Confirmation Procedure

UBS00JBQ

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Wait at least 5 seconds. 4. If DTC is detected, go to EC-794, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-792

2006 Sentra

Wiring Diagram

DTC P0117, P0118 ECT SENSOR

[QR25DE]
UBS00JBR
A EC
C D E F G H I J K L M

Revision: December 2006

EC-793

BBWA1426E
2006 Sentra

DTC P0117, P0118 ECT SENSOR
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

[QR25DE]
UBS00JBS

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-742, "Ground Inspection" .

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. CHECK ECT SENSOR POWER SUPPLY CIRCUIT
1. Disconnect engine coolant temperature (ECT) sensor harness connector.
2. Turn ignition switch ON.
3. Check voltage between ECT sensor terminal 1 and ground with CONSULT-II or tester. Voltage: Approximately 5V
OK or NG OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

BBIA0515E BBIA0010E PBIB0080E

Revision: December 2006

EC-794

2006 Sentra

DTC P0117, P0118 ECT SENSOR

[QR25DE]

3. CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT A

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Disconnect TCM harness connector (A/T models).

EC

4. Check harness continuity between ECT sensor terminal 2 and ECM terminal 67, TCM terminal 42 (A/T

models).

Refer to Wiring Diagram.

C

Continuity should exist.

5. Also check harness for short to ground and short to power.

D

OK or NG

OK >> GO TO 5.

NG >> GO TO 4.

E

4. DETECT MALFUNCTIONING PART

Check the following.

F

G Harness for open or short between TCM and engine coolant temperature sensor (A/T models).

G Harness for open or short between ECM and engine coolant temperature sensor. G

>> Repair open circuit or short to ground or short to power in harness or connectors.

5. CHECK ENGINE COOLANT TEMPERATURE SENSOR

H

Refer to CO-30, "THERMOSTAT AND THERMOSTAT HOUSING" .

OK or NG

I

OK >> GO TO 6.

NG >> Replace engine coolant temperature sensor.

6. CHECK INTERMITTENT INCIDENT

J

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . K

>> INSPECTION END L

M

Revision: December 2006

EC-795

2006 Sentra

DTC P0117, P0118 ECT SENSOR
Component Inspection
ENGINE COOLANT TEMPERATURE SENSOR 1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.

[QR25DE]
UBS00JBT

<Reference data>

Engine coolant temperature °C (°F)

Resistance k

20 (68)

2.1 - 2.9

50 (122)

0.68 - 1.00

90 (194)

0.236 - 0.260

2. If NG, replace engine coolant temperature sensor.

Removal and Installation
ENGINE COOLANT TEMPERATURE SENSOR
Refer to CO-30, "THERMOSTAT AND THERMOSTAT HOUSING" .

PBIB2005E
SEF012P UBS00JBU

Revision: December 2006

EC-796

2006 Sentra

DTC P0122, P0123 TP SENSOR

[QR25DE]

DTC P0122, P0123 TP SENSOR Component Description

PFP:16119
A
UBS00JBV

Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement. The throttle position sensor has the two sensors. These sensors are a kind of potentiometers which transform the throttle valve position into output voltage, and emit the voltage signal to the ECM. In addition, these sensors detect the opening and closing speed of the throttle valve and feed the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.
CONSULT-II Reference Value in Data Monitor Mode

EC
C
D
PBIB0145E
E
UBS00JBW

Specification data are reference values.
MONITOR ITEM

CONDITION

F
SPECIFICATION

THRTL SEN1 THRTL SEN2*

G Ignition switch: ON (Engine stopped)
G Shift lever: D (A/T), 1ST (M/T)

Accelerator pedal: Fully released Accelerator pedal: Fully depressed

More than 0.36V Less than 4.75V

*: Throttle position sensor 2 signal is converted by ECM internally. thus it differs from ECM terminal voltage signal.

On Board Diagnosis Logic

G H
UBS00JBX

These self-diagnoses have the one trip detection logic.

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

I

P0122

Throttle position sensor An excessively low voltage from the TP sensor G Harness or connectors

0122

2 circuit low input

2 is sent to ECM.

(The TP sensor 2 circuit is open or

shorted.)

J

(APP sensor 2 circuit is shorted.)

P0123

Throttle position sensor An excessively high voltage from the TP sen- G Electric throttle control actuator

0123

2 circuit high input

sor 2 is sent to ECM.

(TP sensor 2)

K

G Accelerator pedal position sensor

(APP sensor 2)

FAIL-SAFE MODE

L

When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

Engine operation condition in fail-safe mode

M

The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. So, the acceleration will be poor.

Revision: December 2006

EC-797

2006 Sentra

DTC P0122, P0123 TP SENSOR

[QR25DE]

DTC Confirmation Procedure

UBS00JBY

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for 1 second. 4. If DTC is detected, go to EC-800, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-798

2006 Sentra

Wiring Diagram

DTC P0122, P0123 TP SENSOR

[QR25DE]
UBS00JBZ
A EC
C D E F G H I J K L M

Revision: December 2006

EC-799

BBWA2159E
2006 Sentra

DTC P0122, P0123 TP SENSOR

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

47 B

Sensor power supply (Throttle position sensor)

[Ignition switch: ON]

Approximately 5V

50 W 66 R 69 G 91 R/Y

Throttle position sensor 1
Sensor ground (Throttle position sensor)
Throttle position sensor 2
Sensor power supply (Accelerator pedal position sensor 2)

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully depressed [Engine is running] G Warm-up condition G Idle speed [Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully depressed
[Ignition switch: ON]

More than 0.36V Less than 4.75V Approximately 0V Less than 4.75V More than 0.36V Approximately 5V

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS00JC0

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-742, "Ground Inspection" .

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-800

BBIA0515E
2006 Sentra

DTC P0122, P0123 TP SENSOR
2. CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-I
1. Disconnect electric throttle control actuator harness connector. 2. Turn ignition switch ON.

[QR25DE]
A EC

C

3. Check voltage between electric throttle control actuator terminal 1 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 7. NG >> GO TO 3.

D
BBIA0103E
E
F
G

3. CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-II

PBIB0082E

H

1. Turn ignition switch OFF.

I

2. Disconnect ECM harness connector.

3. Check harness continuity between electric throttle control actuator terminal 1 and ECM terminal 47.

Refer to Wiring Diagram.

J

Continuity should exist.

OK or NG

K

OK >> GO TO 4.

NG >> Repair or replace open circuit.

4. CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-III

L

Check harness for short to power and short to ground, between the following terminals. M

ECM terminal

Sensor terminal

Reference Wiring Diagram

47

Electric throttle control actuator terminal 1

EC-799

91

APP sensor terminal 1

EC-1119

OK or NG
OK >> GO TO 5. NG >> Repair short to ground or short to power in harness or connectors.

5. CHECK APP SENSOR

Refer to EC-1124, "Component Inspection" .
OK or NG OK >> GO TO 11. NG >> GO TO 6.

Revision: December 2006

EC-801

2006 Sentra

DTC P0122, P0123 TP SENSOR
6. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. 2. Perform EC-670, "Accelerator Pedal Released Position Learning" . 3. Perform EC-671, "Throttle Valve Closed Position Learning" . 4. Perform EC-671, "Idle Air Volume Learning" .

[QR25DE]

>> INSPECTION END
7. CHECK THROTTLE POSITION SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 66 and electric throttle control actuator terminal 5.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 8. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK THROTTLE POSITION SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 69 and electric throttle control actuator terminal 2. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK THROTTLE POSITION SENSOR
Refer to EC-803, "Component Inspection" . OK or NG
OK >> GO TO 11. NG >> GO TO 10.
10. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. 2. Perform EC-671, "Throttle Valve Closed Position Learning" . 3. Perform EC-671, "Idle Air Volume Learning" .

>> INSPECTION END
11. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-802

2006 Sentra

DTC P0122, P0123 TP SENSOR

Component Inspection
THROTTLE POSITION SENSOR 1. Reconnect all harness connectors disconnected.
2. Perform EC-671, "Throttle Valve Closed Position Learning" .
3. Turn ignition switch ON.
4. Set shift lever to D position (A/T models) or 1st position (M/T models).
5. Check voltage between ECM terminals 50 (TP sensor 1), 69 (TP sensor 2) and ground under the following conditions.

Terminal

Accelerator pedal

Voltage

50 (Throttle position sensor 1)

Fully released Fully depressed

More than 0.36V Less than 4.75V

69 (Throttle position sensor 2)

Fully released Fully depressed

Less than 4.75V More than 0.36V

6. If NG, replace electric throttle control actuator and go to the next step.
7. Perform EC-671, "Throttle Valve Closed Position Learning" . 8. Perform EC-671, "Idle Air Volume Learning" .

Removal and Installation
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EM-108, "INTAKE MANIFOLD" .

[QR25DE]
UBS00JC1
A

EC

C

D

E

PBIB1060E

F

G
UBS00JC2
H

I

J

K

L

M

Revision: December 2006

EC-803

2006 Sentra

DTC P0125 ECT SENSOR

[QR25DE]

DTC P0125 ECT SENSOR

PFP:22630

Description

UBS00JC3

NOTE: If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117 or P0118. Refer to EC-791 .

COMPONENT DESCRIPTION
The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

SEF594K

< Reference data>

Engine coolant temperature °C (°F)

Voltage* V

Resistance k

-10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.1 - 2.9

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

*: This data is reference value and is measured between ECM terminal 73 (Engine coolant temperature sensor) and ground.

SEF012P

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

On Board Diagnosis Logic

UBS00JC4

DTC No.
P0125 0125

Trouble diagnosis name
Insufficient engine coolant temperature for closed loop fuel control

DTC detecting condition
G Voltage sent to ECM from the sensor is not practical, even when some time has passed after starting the engine.
G Engine coolant temperature is insufficient for closed loop fuel control.

Possible cause
G Harness or connectors (High resistance in the circuit)
G Engine coolant temperature sensor G Thermostat

DTC Confirmation Procedure

UBS00JC5

CAUTION: Be careful not to overheat engine.

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II 1. Turn ignition switch ON.

Revision: December 2006

EC-804

2006 Sentra

DTC P0125 ECT SENSOR
2. Select "DATA MONITOR" mode with CONSULT-II. 3. Check that "COOLAN TEMP/S" is above 10°C (50°F).
If it is above 10°C (50°F), the test result will be OK. If it is below 10°C (50°F), go to following step. 4. Start engine and run it for 65 minutes at idle speed. If "COOLAN TEMP/S" increases to more than 10°C (50°F) within 65 minutes, stop engine because the test result will be OK. 5. If 1st trip DTC is detected, go to EC-805, "Diagnostic Procedure" .
WITH GST Follow the procedure "WITH CONSULT-II" above.
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

[QR25DE]
A

EC

C
SEF174Y
D

UBS00JC6

E

1. Turn ignition switch OFF.

F

2. Loosen and retighten two ground screws on the body. Refer to EC-742, "Ground Inspection" .

G

H

I

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. CHECK ENGINE COOLANT TEMPERATURE SENSOR

BBIA0515E
J
K

Refer to EC-806, "Component Inspection" .

L

OK or NG

OK >> GO TO 3.

NG >> Replace engine coolant temperature sensor.

M

3. CHECK THERMOSTAT OPERATION

When the engine is cold [lower than 70°C (158°F)] condition, grasp lower radiator hose and confirm the engine coolant does not flow. OK or NG
OK >> GO TO 4. NG >> Repair or replace thermostat. Refer to CO-30, "THERMOSTAT AND THERMOSTAT HOUSING" .
4. CHECK INTERMITTENT INCIDENT

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-805

2006 Sentra

DTC P0125 ECT SENSOR
Component Inspection
ENGINE COOLANT TEMPERATURE SENSOR 1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.

<Reference data>

Engine coolant temperature °C (°F)

Resistance k

20 (68)

2.1 - 2.9

50 (122)

0.68 - 1.00

90 (194)

0.236 - 0.260

2. If NG, replace engine coolant temperature sensor.

Removal and Installation
ENGINE COOLANT TEMPERATURE SENSOR
Refer to CO-30, "THERMOSTAT AND THERMOSTAT HOUSING"

[QR25DE]
UBS00JC7
PBIB2005E
SEF012P UBS00JC8

Revision: December 2006

EC-806

2006 Sentra

DTC P0127 IAT SENSOR
DTC P0127 IAT SENSOR Component Description
The intake air temperature sensor is built into mass air flow sensor. The sensor detects intake air temperature and transmits a signal to the ECM. The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rise.

[QR25DE]
PFP:22630
A
UBS00JC9
EC
C

D

<Reference data>

PBIB1604E
E

Intake air temperature °C (°F)

Voltage* V

Resistance k

25 (77)

3.3

1.800 - 2.200

80 (176)

1.2

0.283 - 0.359

*: This data is reference value and is measured between ECM terminal 34 (Intake air temperature sensor) and ground.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis Logic

F
G
H
SEF012P
I
UBS00JCA

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

J

P0127 0127

Intake air temperature too high

Rationally incorrect voltage from the sensor is sent to ECM, compared with the voltage signal from engine coolant temperature sensor.

G Harness or connectors (The sensor circuit is open or shorted)
G Intake air temperature sensor

K

DTC Confirmation Procedure

UBS00JCB

CAUTION:

L

Always drive vehicle at a safe speed.

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at M least 10 seconds before conducting the next test. TESTING CONDITION: This test may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.

WITH CONSULT-II 1. Wait until engine coolant temperature is less than 90°C (194°F) a. Turn ignition switch ON.

Revision: December 2006

EC-807

2006 Sentra

DTC P0127 IAT SENSOR
b. Select "DATA MONITOR" mode with CONSULT-II. c. Check the engine coolant temperature. d. If the engine coolant temperature is not less than 90°C (194°F),
turn ignition switch OFF and cool down engine. G Perform the following steps before engine coolant tempera-
ture is above 90°C (194°F). 2. Turn ignition switch ON. 3. Select "DATA MONITOR" mode with CONSULT-II. 4. Start engine. 5. Hold vehicle speed at more than 70 km/h (43 MPH) for 100 con-
secutive seconds. 6. If 1st trip DTC is detected, go to EC-808, "Diagnostic Procedure" .
WITH GST Follow the procedure "WITH CONSULT-II" above.
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

[QR25DE]
SEF189Y UBS00JCC

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-742, "Ground Inspection" .

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. CHECK INTAKE AIR TEMPERATURE SENSOR
Refer to EC-809, "Component Inspection" . OK or NG
OK >> GO TO 3. NG >> Replace mass air flow sensor (with intake air temperature sensor).
3. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . Refer to EC-787, "Wiring Diagram" .
>> INSPECTION END

BBIA0515E

Revision: December 2006

EC-808

2006 Sentra

DTC P0127 IAT SENSOR

Component Inspection
INTAKE AIR TEMPERATURE SENSOR
1. Check resistance between intake air temperature sensor terminals 5 and 6 under the following conditions.

Intake air temperature °C (°F)

Resistance k

25 (77)

1.800 - 2.200

2. If NG, replace mass air flow sensor (with intake air temperature sensor).

Removal and Installation
MASS AIR FLOW SENSOR
Refer to EM-106, "AIR CLEANER AND AIR DUCT" .

[QR25DE]
UBS0 0JC D
A

EC

C

D
PBIB1604E
E

F

G

SEF012P

H

UBS00JCE
I

J

K L

M

Revision: December 2006

EC-809

2006 Sentra

DTC P0128 THERMOSTAT FUNCTION

[QR25DE]

DTC P0128 THERMOSTAT FUNCTION

PFP:21200

On Board Diagnosis Logic

UBS00JCF

Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long enough. This is due to a leak in the seal or the thermostat stuck open.

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0128 0128

Thermostat function

The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.

G Thermostat G Leakage from sealing portion of thermo-
stat G Engine coolant temperature sensor

DTC Confirmation Procedure

UBS00JCG

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION:
G For best results, perform at ambient temperature of ­10°C (14°F) or higher.
G For best results, perform at engine coolant temperature of ­10°C (14°F) to 68°C (154°F).

WITH CONSULT-II
1. Replace thermostat with new one. Refer to CO-30, "THERMOSTAT AND THERMOSTAT HOUSING" . Use only a genuine NISSAN thermostat as a replacement. If an incorrect thermostat is used, the MIL may come on.
2. Turn ignition switch ON.
3. Select "COOLAN TEMP/S" in "DATA MONITOR" mode with CONSULT-II.
4. Check that the "COOLAN TEMP/S" is above 68°C (154°F). If it is below 68°C (154°F), go to following step. If it is above 68°C (154°F), stop engine and cool down the engine to less than 68°C (154°F), then retry from step 1.
5. Drive vehicle for 10 consecutive minutes under the following conditions.

VHCL SPEED SE

80 - 120 km/h (50 - 75 MPH)

If 1st trip DTC is detected, go to EC-810, "Diagnostic Procedure" .
WITH GST
Follow the procedure "WITH CONSULT-II" above.
Diagnostic Procedure
1. CHECK ENGINE COOLANT TEMPERATURE SENSOR

SEF176Y UBS00JCH

Refer to EC-811, "Component Inspection" .
OK or NG OK >> INSPECTION END NG >> Replace engine coolant temperature sensor.

Revision: December 2006

EC-810

2006 Sentra

DTC P0128 THERMOSTAT FUNCTION
Component Inspection
ENGINE COOLANT TEMPERATURE SENSOR 1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.

<Reference data>

Engine coolant temperature °C (°F)

Resistance k

20 (68)

2.1 - 2.9

50 (122)

0.68 - 1.00

90 (194)

0.236 - 0.260

2. If NG, replace engine coolant temperature sensor.

Removal and Installation
ENGINE COOLANT TEMPERATURE SENSOR
Refer to CO-30, "THERMOSTAT AND THERMOSTAT HOUSING" .

[QR25DE]
UBS00JCI
A
EC
C
D
PBIB2005E
E
F
G
H
SEF012P UBS00JCJ
I
J
K
L
M

Revision: December 2006

EC-811

2006 Sentra

DTC P0130 A/F SENSOR 1
DTC P0130 A/F SENSOR 1
Component Description
The A/F sensor 1 is a planar dual-cell limit current sensor. The sensor element of the A/F sensor 1 is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element. The sensor is capable of precise measurement = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide range (0.7 <
< air). The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygenpump cell so that the composition of the exhaust gas in the diffusion gap remains constant at = 1. Therefore, the A/F sensor 1 is able to indicate air-fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800°C (1,292 - 1,472°F).

[QR25DE]
PFP:22693
UBS00JKB
SEF579Z

CONSULT-II Reference Value in Data Monitor Mode

SEF580Z UBS00JKC

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

A/F SEN1 (B1)

G Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5V

On Board Diagnosis Logic

UBS00JKD

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the air fuel ratio (A/ F) sensor 1 signal fluctuates according to fuel feedback control.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P0130 0130

Air fuel ratio (A/F) sensor 1 circuit

The A/F signal computed by ECM from the A/F sensor 1 signal is constantly approx. 1.5V.

G Harness or connectors (The sensor circuit is open or shorted.)
G Air fuel ratio (A/F) sensor 1

DTC Confirmation Procedure

UBS00JKE

CAUTION: Always drive vehicle at a safe speed.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

WITH CONSULT-II
1. Start engine and warm it up to normal operating temperature. 2. Select "A/F SEN1 (B1)" in "DATA MONITOR" mode with CONSULT-II.
3. Check "A/F SEN1 (B1)" indication. If the indication is constantly approx. 1.5V and does not fluctuates, go to EC-816, "Diagnostic Procedure" . If the indication fluctuates around 1.5V, go to next step.

Revision: December 2006

EC-812

2006 Sentra

DTC P0130 A/F SENSOR 1

[QR25DE]

4. Select "A/F SEN1 (B1) P1276" of "A/F SEN1" in "DTC WORK SUPPORT" mode with CONSULT-II.

5. Touch "START".

A

6. When the following conditions are met, "TESTING" will be dis-

played on the CONSULT-II screen.

EC

ENG SPEED

1,750 - 3,200 rpm

Vehicle speed

More than 64 km/h (40 MPH)

B/FUEL SCHDL

1.0 - 8.0 msec

C

COOLANT TEMP/S

More than 70°C (158°F)

Shift lever

D position with OD ON (A/T models) 5th position (M/T models)

If "TESTING" is not displayed after 20 seconds, retry from step 2.

D
SEF576Z
E

7. Release accelerator pedal fully.

NOTE:

F

Never apply brake during releasing the accelerator pedal.

G

8. Make sure that "TESTING" changes to "COMPLETED". If "TESTING" changed to "OUT OF CONDITION", retry from step 6.
9. Make sure that "OK" is displayed after touching "SELF-DIAG RESULT". If "NG" is displayed, go to EC-816, "Diagnostic Procedure" .

H
SEF577Z
I
J
K

L

SEF578Z

Overall Function Check

UBS00JKF

M

Use this procedure to check the overall function of the A/F sensor 1 circuit. During this check, a 1st trip DTC

might not be confirmed.

WITH GST

1. Start engine and warm it up to normal operating temperature. 2. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in the suitable gear position. 3. Set D position with "OD" ON (A/T) or 5th position (M/T), then release the accelerator pedal fully until the
vehicle speed decreases to 50 km/h (30 MPH). NOTE: Never apply brake during releasing the accelerator pedal. 4. Repeat steps 2 to 3 for 5 times. 5. Stop the vehicle and turn ignition switch OFF. 6. Wait at least 10 seconds and restart engine. 7. Repeat steps 2 to 3 for 5 times. 8. Stop the vehicle and connect GST to the vehicle.

Revision: December 2006

EC-813

2006 Sentra

DTC P0130 A/F SENSOR 1
9. Make sure that no 1st trip DTC is displayed. If the 1st trip DTC is displayed, go to EC-816, "Diagnostic Procedure" .

[QR25DE]

Revision: December 2006

EC-814

2006 Sentra

Wiring Diagram

DTC P0130 A/F SENSOR 1

[QR25DE]
UBS00JKG
A EC
C D E F G H I J K L M

Revision: December 2006

EC-815

BBWA1478E
2006 Sentra

DTC P0130 A/F SENSOR 1

[QR25DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

[Engine is running] G Warm-up condition G Idle speed

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body. Refer to EC-742, "Ground Inspection" .

Approximately 3.1V Approximately 2.6V 2 - 3V 2 - 3V

PBIB1584E

UBS00JKH

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

BBIA0515E

Revision: December 2006

EC-816

2006 Sentra

DTC P0130 A/F SENSOR 1
2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect A/F sensor 1 harness connector. 2. Turn ignition switch ON.
3. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 4. NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M19, E108 G Harness connectors E10, F48 G Fuse block (J/B) connector M1 G 15A fuse G Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors.

[QR25DE]
A

EC

C

D
BBIA0304E
E

F

G

PBIB1683E

H

I

J

K

L

M

Revision: December 2006

EC-817

2006 Sentra

DTC P0130 A/F SENSOR 1

4. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between the following terminals. Refer to Wiring Diagram.

A/F sensor 1 terminal 1 5 6 2

ECM terminal 16 35 56 75

[QR25DE]

Continuity should exist.
4. Check harness continuity between ECM terminals 16, 35, 56, 75 or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to Wiring Diagram.
Continuity should not exist.
5. Also check harness for short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK INTERMITTENT INCIDENT
Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . OK or NG
OK >> GO TO 6. NG >> Repair or replace.
6. REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1. CAUTION: G Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one. G Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> INSPECTION END
Removal and Installation
AIR FUEL RATIO SENSOR Refer to EM-113, "EXHAUST MANIFOLD AND THREE WAY CATALYST"

UBS00JKI

Revision: December 2006

EC-818

2006 Sentra

DTC P0131 A/F SENSOR 1
DTC P0131 A/F SENSOR 1
Component Description
The A/F sensor 1 is a planar dual-cell limit current sensor. The sensor element of the A/F sensor 1 is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element. The sensor is capable of precise measurement = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide range (0.7 <
< air). The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygenpump cell so that the composition of the exhaust gas in the diffusion gap remains constant at = 1. Therefore, the A/F sensor 1 is able to indicate air-fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800°C (1,292 - 1,472°F).

[QR25DE]
PFP:22693
A
UBS00JJJ
EC
C
D
SEF579Z
E
F
G

H

CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.

SEF580Z

UBS00JJK

I

MONITOR ITEM

CONDITION

SPECIFICATION

A/F SEN1 (B1)

G Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5V

J

On Board Diagnosis Logic

UBS00JJL

K

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the air fuel ratio (A/

F) sensor 1 signal is not inordinately low.

DTC No.

Trouble diagnosis name

DTC detecting condition

L
Possible Cause

P0131 0131

The A/F signal computed by ECM from the A/F G Harness or connectors

Air fuel ratio (A/F) sen- sensor 1 signal is constantly approx. 0V. sor 1 circuit low voltage

(The sensor circuit is open or shorted.)

M

G Air fuel ratio (A/F) sensor 1

Revision: December 2006

EC-819

2006 Sentra

DTC P0131 A/F SENSOR 1

[QR25DE]

DTC Confirmation Procedure

UBS00JJM

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

WITH CONSULT-II

1. Start engine and warm it up to normal operating temperature.
2. Select "A/F SEN1 (B1)" in "DATA MONITOR" mode with CONSULT-II.
3. Check "A/F SEN1 (B1)" indication. If the indication is constantly approx. 0V, go to EC-822, "Diagnostic Procedure" . If the indication is not constantly approx. 0V, go to next step.
4. Turn ignition switch OFF, wait at least 10 seconds and then restart engine.
5. Drive and accelerate vehicle to more than 40 km/h (25 MPH) within 20 seconds after restarting engine.
6. Maintain the following conditions for about 20 consecutive seconds.

ENG SPEED

1,000 - 3,200 rpm

SEF581Z

VHCL SPEED SE

More than 40 km/h (25 MPH)

B/FUEL SCHDL

1.5 - 9.0 msec

COOLANT TEMP/S

Less than 70°C (158°F)

Shift lever

Suitable position

NOTE: G Keep the accelerator pedal as steady as possible during the cruising. G If this procedure is not completed within 1 minute after restarting engine at step 4, return to step
4. 7. If 1st trip DTC is displayed, go to EC-822, "Diagnostic Procedure" .
WITH GST
Follow the procedure "WITH CONSULT-II" above.

Revision: December 2006

EC-820

2006 Sentra

Wiring Diagram

DTC P0131 A/F SENSOR 1

[QR25DE]
UBS00JJN
A EC
C D E F G H I J K L M

Revision: December 2006

EC-821

BBWA1478E
2006 Sentra

DTC P0131 A/F SENSOR 1

[QR25DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

[Engine is running] G Warm-up condition G Idle speed

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body. Refer to EC-742, "Ground Inspection" .

Approximately 3.1V Approximately 2.6V 2 - 3V 2 - 3V

PBIB1584E

UBS00JJO

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

BBIA0515E

Revision: December 2006

EC-822

2006 Sentra

DTC P0131 A/F SENSOR 1
2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect A/F sensor 1 harness connector. 2. Turn ignition switch ON.
3. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 4. NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M19, E108 G Harness connectors E10, F48 G Fuse block (J/B) connector M1 G 15A fuse G Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors.

[QR25DE]
A

EC

C

D
BBIA0304E
E

F

G

PBIB1683E

H

I

J

K

L

M

Revision: December 2006

EC-823

2006 Sentra

DTC P0131 A/F SENSOR 1

4. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between the following terminals. Refer to Wiring Diagram.

A/F sensor 1 terminal 1 5 6 2

ECM terminal 16 35 56 75

[QR25DE]

Continuity should exist.
4. Check harness continuity between ECM terminals 16, 35, 56, 75 or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to Wiring Diagram.
Continuity should not exist.
5. Also check harness for short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK INTERMITTENT INCIDENT
Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . OK or NG
OK >> GO TO 6. NG >> Repair or replace.
6. REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1. CAUTION: G Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one. G Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> INSPECTION END
Removal and Installation
AIR FUEL RATIO SENSOR Refer to EM-113, "EXHAUST MANIFOLD AND THREE WAY CATALYST" .

UBS00JJP

Revision: December 2006

EC-824

2006 Sentra

DTC P0132 A/F SENSOR 1
DTC P0132 A/F SENSOR 1
Component Description
The A/F sensor 1 is a planar dual-cell limit current sensor. The sensor element of the A/F sensor 1 is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element. The sensor is capable of precise measurement = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide range (0.7 <
< air). The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygenpump cell so that the composition of the exhaust gas in the diffusion gap remains constant at = 1. Therefore, the A/F sensor 1 is able to indicate air-fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800°C (1,292 - 1,472°F).

[QR25DE]
PFP:22693
A
UBS00JJQ
EC
C
D
SEF579Z
E
F
G

H

CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.

SEF580Z

UBS00JJR

I

MONITOR ITEM

CONDITION

SPECIFICATION

A/F SEN1 (B1)

G Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5V

J

On Board Diagnosis Logic

UBS00JJS

K

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the air fuel ratio (A/ F) sensor 1 signal is not inordinately high.

DTC No.

Trouble diagnosis name

DTC detecting condition

L
Possible Cause

P0132 0132

Air fuel ratio (A/F) sen- The A/F signal computed by ECM from the A/F G Harness or connectors

sor 1 circuit high volt- sensor 1 signal is constantly approx. 5V.

(The sensor circuit is open or shorted.)

M

age

G Air fuel ratio (A/F) sensor 1

Revision: December 2006

EC-825

2006 Sentra

DTC P0132 A/F SENSOR 1

[QR25DE]

DTC Confirmation Procedure

UBS00JJT

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

WITH CONSULT-II

1. Start engine and warm it up to normal operating temperature.
2. Select "A/F SEN1 (B1)" in "DATA MONITOR" mode with CONSULT-II.
3. Check "A/F SEN1 (B1)" indication. If the indication is constantly approx. 5V, go to EC-828, "Diagnostic Procedure" . If the indication is not constantly approx. 5V, go to next step.
4. Turn ignition switch OFF, wait at least 10 seconds and then restart engine.
5. Drive and accelerate vehicle to more than 40 km/h (25 MPH) within 20 seconds after restarting engine.
6. Maintain the following conditions for about 20 consecutive seconds.

ENG SPEED

1,000 - 3,200 rpm

SEF581Z

VHCL SPEED SE

More than 40 km/h (25 MPH)

B/FUEL SCHDL

1.5 - 9.0 msec

COOLANT TEMP/S

Less than 70°C (158°F)

Shift lever

Suitable position

NOTE: G Keep the accelerator pedal as steady as possible during the cruising. G If this procedure is not completed within 1 minute after restarting engine at step 4, return to step
4. 7. If 1st trip DTC is displayed, go to EC-828, "Diagnostic Procedure" .
WITH GST
Follow the procedure "WITH CONSULT-II" above.

Revision: December 2006

EC-826

2006 Sentra

Wiring Diagram

DTC P0132 A/F SENSOR 1

[QR25DE]
UBS00JJU
A EC
C D E F G H I J K L M

Revision: December 2006

EC-827

BBWA1478E
2006 Sentra

DTC P0132 A/F SENSOR 1

[QR25DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

[Engine is running] G Warm-up condition G Idle speed

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body. Refer to EC-742, "Ground Inspection" .

Approximately 3.1V Approximately 2.6V 2 - 3V 2 - 3V

PBIB1584E

UBS00JJV

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

BBIA0515E

Revision: December 2006

EC-828

2006 Sentra

DTC P0132 A/F SENSOR 1
2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect A/F sensor 1 harness connector. 2. Turn ignition switch ON.
3. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 4. NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M19, E108 G Harness connectors E10, F48 G Fuse block (J/B) connector M1 G 15A fuse G Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors.

[QR25DE]
A

EC

C

D
BBIA0304E
E

F

G

PBIB1683E

H

I

J

K

L

M

Revision: December 2006

EC-829

2006 Sentra

DTC P0132 A/F SENSOR 1

4. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between the following terminals. Refer to Wiring Diagram.

A/F sensor 1 terminal 1 5 6 2

ECM terminal 16 35 56 75

[QR25DE]

Continuity should exist.
4. Check harness continuity between ECM terminals 16, 35, 56, 75 or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to Wiring Diagram.
Continuity should not exist.
5. Also check harness for short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK INTERMITTENT INCIDENT
Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . OK or NG
OK >> GO TO 6. NG >> Repair or replace.
6. REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1. CAUTION: G Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one. G Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> INSPECTION END
Removal and Installation
AIR FUEL RATIO SENSOR Refer to EM-113, "EXHAUST MANIFOLD AND THREE WAY CATALYST" .

UBS00JJW

Revision: December 2006

EC-830

2006 Sentra

DTC P0133 A/F SENSOR 1
DTC P0133 A/F SENSOR 1
Component Description
The A/F sensor 1 is a planar dual-cell limit current sensor. The sensor element of the A/F sensor 1 is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element. The sensor is capable of precise measurement = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide range (0.7 <
< air). The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygenpump cell so that the composition of the exhaust gas in the diffusion gap remains constant at = 1. Therefore, the A/F sensor 1 is able to indicate air-fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800°C (1,292 - 1,472°F).

[QR25DE]
PFP:22693
A
UBS00JKJ
EC
C
D
SEF579Z
E
F
G

H

CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.

SEF580Z

UBS00JKK

I

MONITOR ITEM

CONDITION

SPECIFICATION

A/F SEN1 (B1)

G Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5V

J

On Board Diagnosis Logic

UBS00JKL

K

To judge the malfunction of air fuel ratio (A/F) sensor 1, this diagnosis measures response time of the A/F sig-

nal computed by ECM from the air fuel ratio (A/F) sensor 1 signal. The time is compensated by engine operat-

ing (speed and load), fuel feedback control constant, and the air fuel ratio (A/F) sensor 1 temperature index. L Judgment is based on whether the compensated time (the A/F sensor 1 signal cycling time index) is inordi-

nately long or not.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

M

P0133 0133

Air fuel ratio (A/F) sensor 1 circuit slow response

The response of the A/F signal computed by ECM from A/F sensor 1 signal takes more than the specified time.

G Harness or connectors (The sensor circuit is open or shorted.)
G Air fuel ratio (A/F) sensor 1 G Air fuel ratio (A/F) sensor heater 1 G Fuel pressure G Fuel injector G Intake air leaks G Exhaust gas leaks G PCV G Mass air flow sensor

Revision: December 2006

EC-831

2006 Sentra

DTC P0133 A/F SENSOR 1

[QR25DE]

DTC Confirmation Procedure

UBS00JKM

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

WITH CONSULT-II

1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1minute under no load.
4. Let engine idle for 1 minute.
5. Select "A/F SEN1(B1) P1278/P1279" of "A/F SEN1" in "DTC WORK SUPPORT" mode with CONSULT-II.
6. Touch "START". If "COMPLETED" appears on CONSULT-II screen, go to step 10. If "COMPLETED" does not appear on CONSULT-II screen, go to the following step.

7. After perform the following procedure, "TESTING" will be displayed on the CONSULT-II screen.
a. Increase the engine speed up to 4,000 to 5,000 rpm and keep it for 10 seconds.
b. Fully release accelerator pedal and then let engine idle for about 10 seconds. If "TESTING" is not displayed after 10 seconds, refer to EC725, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .
8. Wait for about 20 seconds at idle at under the condition that "TESTING" is displayed on the CONSULT-II screen.
9. Make sure that "TESTING" changes to "COMPLETED". If "TESTING" changed to "OUT OF CONDITION", refer to EC-725, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .
10. Make sure that "OK" is displayed after touching "SELF-DIAG RESULT". If "NG" is displayed, go to EC-835, "Diagnostic Procedure" .

PBIB0756E PBIB1925E

WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Select Service $01 with GST.
3. Calculate the total value of "Short term fuel trim" and "Long term fuel trim" indications. Make sure that the total percentage should be within ±15%. If OK, go to the following step. If NG, check the following.
G Intake air leaks

Revision: December 2006

EC-832

PBIB0758E
2006 Sentra

DTC P0133 A/F SENSOR 1

[QR25DE]

G Exhaust gas leaks

G Incorrect fuel pressure

A

G Lack of fuel

G Fuel injector

G Incorrect PCV hose connection

EC

G PCV valve

G Mass air flow sensor

C

4. Turn ignition switch OFF and wait at least 10 seconds.

5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1minute under no load.

6. Let engine idle for 1 minute.

D

7. Increase the engine speed up to 4,000 to 5,000 rpm and keep it for 10 seconds.

8. Fully release accelerator pedal and then let engine idle for about 1 minute.

9. Select Service $07 with GST.

E

If 1st trip DTC is detected, go to EC-835, "Diagnostic Procedure" .

F

G

H

I

J

K

L

M

Revision: December 2006

EC-833

2006 Sentra

Wiring Diagram

DTC P0133 A/F SENSOR 1

[QR25DE]
UBS00JKN

Revision: December 2006

EC-834

BBWA1478E
2006 Sentra

DTC P0133 A/F SENSOR 1

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)
C

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

[Engine is running] G Warm-up condition G Idle speed

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body. Refer to EC-742, "Ground Inspection" .

D

E

PBIB1584E

Approximately 3.1V

Approximately 2.6V

F

2 - 3V

2 - 3V

G

UBS00JKO

H

I

J

K

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1
Loosen and retighten the air fuel ratio (A/F) sensor 1. Tightening torque: 40 - 60 N-m (4.1 - 6.1 kg-m, 30 - 44 ft-lb)
>> GO TO 3.

L

BBIA0515E

M

Revision: December 2006

EC-835

BBIA0304E
2006 Sentra

DTC P0133 A/F SENSOR 1
3. CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle. 2. Listen for an exhaust gas leak before three way catalyst (manifold).

[QR25DE]

OK or NG OK >> GO TO 4. NG >> Repair or replace.
4. CHECK FOR INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor. OK or NG
OK >> GO TO 5. NG >> Repair or replace.

PBIB1216E

Revision: December 2006

EC-836

2006 Sentra

DTC P0133 A/F SENSOR 1
5. CLEAR THE SELF-LEARNING DATA
With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT-II. 3. Clear the self-learning control coefficient by touching "CLEAR"
or "START". 4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?

[QR25DE]
A EC
C D

E

SEF215Z

F

Without CONSULT-II

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF.

G

3. Disconnect mass air flow sensor harness connector, and restart

and run engine for at least 5 seconds at idle speed.

4. Stop engine and reconnect mass air flow sensor harness con-

H

nector.

5. Make sure DTC P0102 is displayed.

6. Erase the DTC memory. Refer to EC-653, "HOW TO ERASE

I

EMISSION-RELATED DIAGNOSTIC INFORMATION" .

7. Make sure DTC P0000 is displayed.
8. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?
Yes or No

J
BBIA0130E
K

Yes >> Perform trouble diagnosis for DTC P0171 or P0172. Refer to EC-867, "DTC P0171 FUEL INJEC-

TION SYSTEM FUNCTION" or EC-875, "DTC P0172 FUEL INJECTION SYSTEM FUNCTION" .

No >> GO TO 6.

L

M

Revision: December 2006

EC-837

2006 Sentra

DTC P0133 A/F SENSOR 1
6. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect A/F sensor 1 harness connector. 3. Turn ignition switch ON.

[QR25DE]

4. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 8. NG >> GO TO 7.
7. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M19, E108 G Harness connectors E10, F48 G Fuse block (J/B) connector M1 G 15A fuse G Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors.

BBIA0304E PBIB1683E

Revision: December 2006

EC-838

2006 Sentra

DTC P0133 A/F SENSOR 1

8. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between the following terminals. Refer to Wiring Diagram.

A/F sensor 1 terminal 1 5 6 2

ECM terminal 16 35 56 75

[QR25DE]
A EC
C D

Continuity should exist. E
4. Check harness continuity between ECM terminals 16, 35, 56, 75 or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to Wiring Diagram.

Continuity should not exist.

F

5. Also check harness for short to power.

OK or NG

OK >> GO TO 9.

G

NG >> Repair open circuit or short to ground or short to power in harness or connectors.

9. CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER

H

Refer to EC-756, "Component Inspection" .

OK or NG

I

OK >> GO TO 10.

NG >> GO TO 13.

10. CHECK MASS AIR FLOW SENSOR

J

Refer to EC-775, "Component Inspection" .

OK or NG

K

OK >> GO TO 11.
NG >> Replace mass air flow sensor. L
11. CHECK PCV VALVE

Refer to EC-639, "Component Inspection" .

M

OK or NG

OK >> GO TO 12. NG >> Repair or replace PCV valve.

12. CHECK INTERMITTENT INCIDENT

Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . OK or NG
OK >> GO TO 13. NG >> Repair or replace.

Revision: December 2006

EC-839

2006 Sentra

DTC P0133 A/F SENSOR 1
13. REPLACE AIR FUEL RATIO (A/F) SENSOR 1

[QR25DE]

Replace air fuel ratio (A/F) sensor 1.
CAUTION: G Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
G Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> INSPECTION END
Removal and Installation
AIR FUEL RATIO SENSOR Refer to EM-113, "EXHAUST MANIFOLD AND THREE WAY CATALYST" .

UBS00JKP

Revision: December 2006

EC-840

2006 Sentra

DTC P0137 HO2S2
DTC P0137 HO2S2
Component Description
The heated oxygen sensor 2, after three way catalyst (manifold), monitors the oxygen level in the exhaust gas. Even if switching characteristics of the air fuel ratio (A/F) sensor 1 are shifted, the air-fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2. This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 2 is not used for engine control operation.

[QR25DE]
PFP:226A0
A
UBS00JXQ
EC
C
D

CONSULT-II Reference Value in Data Monitor Mode

SEF327R
E
UBS00JXR

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

F

HO2S2 (B1)

G Revving engine from idle to 3,000 rpm quickly after the following conditions 0 - 0.3V  Approx. 0.6 -

are met

1.0V

­ Engine: after warming up

G

HO2S2 MNTR (B1) ­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at LEAN  RICH idle for 1 minute under no load

On Board Diagnosis Logic

H
UBS00JXS

The heated oxygen sensor 2 has a much longer switching time

between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen storage capacity before the three way catalyst (manifold) causes

I

the longer switching time. To judge the malfunctions of heated oxy-

gen sensor 2, ECM monitors whether the maximum voltage of the

sensor is sufficiently high during the various driving condition such

J

as fuel-cut.

K

PBIB2030E
L

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

G Harness or connectors

M

(The sensor circuit open or shorted.)

P0137 0137

Heated oxygen sensor 2 cir- The maximum voltage from the sensor is

cuit low voltage

not reached to the specified voltage.

G Heated oxygen sensor 2 G Fuel pressure

G Fuel injector

G Intake air leaks

Revision: December 2006

EC-841

2006 Sentra

DTC P0137 HO2S2

[QR25DE]

DTC Confirmation Procedure

UBS00JXT

NOTE: If DTC confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II

TESTING CONDITION: For the best results, perform DTC WORK SUPPORT at a temperature of 0 to 30°C (32 to 86°F).

1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.

2. Start engine and warm it up to the normal operating temperature.

3. Turn ignition switch OFF and wait at least 10 seconds.

4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

5. Let engine idle for 1 minute.

6. Make sure that "COOLAN TEMP/S" indicates more than 70°C (158°F). If not, warm up engine and go to next step when "COOLAN TEMP/S" indication reaches to 70°C (158°F).

SEF174Y

7. Open engine hood.

8. Select "HO2S2 (B1) P1147" of "HO2S2" in "DTC WORK SUPPORT" mode with CONSULT-II.

9. Start engine and following the instruction of CONSULT-II.

NOTE: It will take at most 10 minutes until "COMPLETED" is displayed.
10. Make sure that "OK" is displayed after touching "SELF-DIAG RESULTS". If "NG" is displayed, refer to EC-845, "Diagnostic Procedure" . If "CAN NOT BE DIAGNOSED" is displayed, perform the following.
a. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
b. Return to step 1.

PBIB2373E

Overall Function Check

UBS00JXU

Use this procedure to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st trip DTC might not be confirmed.

WITH GST 1. Start engine and warm it up to the normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. 4. Let engine idle 1 minute. 5. Set voltmeter probes between ECM terminal 74 (HO2S2 signal) and ground.

Revision: December 2006

EC-842

2006 Sentra

DTC P0137 HO2S2
6. Check the voltage when revving up to 4,000 rpm under no load at least 10 times. (Depress and release accelerator pedal as soon as possible.) The voltage should be above 0.78V at least once during this procedure. If the voltage can be confirmed in step 6, step 7 is not necessary.
7. Keep vehicle idling for 10 minutes, then check the voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position with "OD" OFF (A/T models) 3rd gear position (M/T models). The voltage should be above 0.78V at least once during this procedure.
8. If NG, go to EC-845, "Diagnostic Procedure" .

[QR25DE]
A EC
C
PBIB1197E
D E F G H I J K L M

Revision: December 2006

EC-843

2006 Sentra

Wiring Diagram

DTC P0137 HO2S2

[QR25DE]
UBS00JXV

Revision: December 2006

EC-844

BBWA1427E
2006 Sentra

DTC P0137 HO2S2

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

[Engine is running]

C

G Engine speed: Below 3,600 rpm after

the following conditions are met.

­ Engine: After warming up

0 - 1.0V

D

­ Keeping the engine speed between

25 W/B

Heated oxygen sensor 2 heater

3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load

E
[Ignition switch: ON]

G Engine stopped

BATTERY VOLTAGE

[Engine is running]

(11 - 14V)

F

G Engine speed: Above 3,600 rpm.

74 R/L

Heated oxygen sensor 2

78 B

Sensor ground (Heated oxygen sensor 2)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

[Engine is running] G Revving engine from idle to 3,000 rpm
quickly after the following conditions are met. ­ Engine: After warming up
­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load
[Engine is running]
G Warm-up condition G Idle speed

0 - Approximately 1.0V Approximately 0V

1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body. Refer to EC-742, "Ground Inspection" .

G H
I J
UBS00JXW
K L

M

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

BBIA0515E

Revision: December 2006

EC-845

2006 Sentra

DTC P0137 HO2S2
2. CLEAR THE SELF-LEARNING DATA
With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode
with CONSULT-II. 3. Clear the self-learning control coefficient by touching "CLEAR". 4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 detected? Is it difficult to start engine?
Without CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF. 3. Disconnect mass air flow sensor harness connector, and restart
and run engine for at least 5 seconds at idle speed. 4. Stop engine and reconnect mass air flow sensor harness con-
nector. 5. Make sure that DTC P0102 is displayed. 6. Erase the DTC memory. Refer to EC-653, "HOW TO ERASE
EMISSION-RELATED DIAGNOSTIC INFORMATION" . 7. Make sure that DTC P0000 is displayed. 8. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 detected? Is it difficult to start engine? Yes or No Yes >> Perform trouble diagnosis for DTC P0171. Refer to EC-867 . No >> GO TO 3.
3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 2 harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between ECM terminal 78 and HO2S2
terminal 4. Refer to Wiring Diagram.
Continuity should exist. 5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power
in harness or connectors.

Revision: December 2006

EC-846

[QR25DE]
SEF215Z BBIA0130E
BBIA0175E
2006 Sentra

DTC P0137 HO2S2
4. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 74 and HO2S2 terminal 1. Refer to Wiring Diagram.
Continuity should exist. 2. Check harness continuity between ECM terminal 74 or HO2S2 terminal 1 and ground.
Refer to Wiring Diagram.
Continuity should not exist. 3. Also check harness for short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK HEATED OXYGEN SENSOR 2
Refer to EC-847, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> Replace heated oxygen sensor 2.
6. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

[QR25DE]
A EC
C D E F G H

>> INSPECTION END
Component Inspection
HEATED OXYGEN SENSOR 2

I
UBS00JXX

With CONSULT-II

J

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. K

4. Let engine idle 1 minute.

5. Select "FUEL INJECTION" in "ACTIVE TEST" mode, and select

"HO2S2 (B1)" as the monitor item with CONSULT-II.

L

M

PBIB1783E

Revision: December 2006

EC-847

2006 Sentra

DTC P0137 HO2S2
6. Check "HO2S2 (B1)" at idle speed when adjusting "FUEL INJECTION" to ±25%.

[QR25DE]

PBIB2163E
"HO2S2 (B1)" should be above 0.78V at least once when the "FUEL INJECTION" is +25%. "HO2S2 (B1)" should be below 0.18V at least once when the "FUEL INJECTION" is -25%.
CAUTION: G Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
G Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

Without CONSULT-II

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4. Let engine idle for 1 minute.

5. Set voltmeter probes between ECM terminal 74 (HO2S2 signal) and ground.

6. Check the voltage when revving up to 4,000 rpm under no load at least 10 times. (Depress and release accelerator pedal as soon as possible.) The voltage should be above 0.78V at least once during this procedure. If the voltage is above 0.78V at step 6, step 7 is not necessary.

7. Keep vehicle idling for 10 minutes, then check voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position with "OD" OFF (A/T models) 3rd gear position (M/T models). The voltage should be below 0.18V at least once during this procedure.

PBIB1197E

8. If NG, replace heated oxygen sensor 2.

CAUTION: G Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.

G Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

Removal and Installation
HEATED OXYGEN SENSOR 2
Refer to EM-113, "EXHAUST MANIFOLD AND THREE WAY CATALYST" .

UBS00JXY

Revision: December 2006

EC-848

2006 Sentra

DTC P0138 HO2S2
DTC P0138 HO2S2
Component Description
The heated oxygen sensor 2, after three way catalyst (manifold), monitors the oxygen level in the exhaust gas. Even if switching characteristics of the air fuel ratio (A/F) sensor 1 are shifted, the air-fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2. This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 2 is not used for engine control operation.

[QR25DE]
PFP:226A0
A
UBS00JUI
EC
C
D

CONSULT-II Reference Value in Data Monitor Mode

SEF327R
E
UBS00JUJ

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

F

HO2S2 (B1)

G Revving engine from idle to 3,000 rpm quickly after the following conditions 0 - 0.3V  Approx. 0.6 -

are met

1.0V

­ Engine: after warming up

G

HO2S2 MNTR (B1) ­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at LEAN  RICH idle for 1 minute under no load

On Board Diagnosis Logic

H
UBS00JUK

The heated oxygen sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/

F) sensor 1. The oxygen storage capacity before the three way catalyst (manifold) causes the longer switching time.

I

MALFUNCTION A

To judge the malfunctions of rear heated oxygen sensor 2, ECM

J

monitors whether the voltage is unusually high during the various

driving condition such as fuel-cut.

K

L

MALFUNCTION B
To judge the malfunctions of heated oxygen sensor 2, ECM monitors whether the minimum voltage of sensor is sufficiently low during the various driving condition such as fuel-cut.

PBIB2266E

M

Revision: December 2006

EC-849

PBIB2376E
2006 Sentra

DTC P0138 HO2S2

[QR25DE]

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

G Harness or connectors

A)

An excessively high voltage from the sensor is sent to ECM.

(The sensor circuit is open or shorted.)

G Heated oxygen sensor 2

P0138 0138

Heated oxygen sensor 2 circuit high voltage
B)

The minimum voltage from the sensor is not reached to the specified voltage.

G Harness or connectors (The sensor circuit is open or shorted.)
G Heated oxygen sensor 2 G Fuel pressure G Fuel injector

DTC Confirmation Procedure

UBS00N9E

Perform PROCEDURE FOR MALFUNCION A first. If DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

PROCEDURE FOR MALFUNCTION A With CONSULT-II
1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.
2. Start engine and warm it up to the normal operating temperature. 3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 2 minutes. 6. If 1st trip DTC is detected, go to EC-853, "Diagnostic Procedure"
.

SEF174Y

With GST Follow the procedure "With CONSULT-II" above.

PROCEDURE FOR MALFUNCTION B

With CONSULT-II

TESTING CONDITION: For the best results, perform DTC WORK SUPPORT at a temperature of 0 to 30°C (32 to 86°F).

1. Turn ignition switch ON and select "DATA MONITOR " mode with CONSULT-II

2. Start engine and warm it up to the normal operating temperature.

3. Turn ignition switch OFF and wait at least 10 seconds.

4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

5. Let engine idle for 1 minute.

6. Make sure that "COOLAN TEMP/S" indicates more than 70°C (158°F). If not, warm up engine and go to next step when "COOLAN TEMP/S" indication reaches to 70°C (158°F).

SEF174Y

7. Open engine hood.

8. Select "HO2S2 (B1) P1146" of "HO2S2" in "DTC WORK SUPPORT" mode with CONSULT-II.

Revision: December 2006

EC-850

2006 Sentra

DTC P0138 HO2S2
9. Start engine and following the instruction of COSULT-II.

[QR25DE]
A

EC

C

NOTE: It will take at most 10 minutes until "COMPLETED" is displayed.
10. Make sure that "OK" is displayed after touching "SELF-DIAG RESULTS". If "NG" is displayed, refer to EC-853, "Diagnostic Procedure" . If "CAN NOT BE DIAGNOSED" is displayed, perform the following.
a. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
b. Return to step 1.

PBIB2372E

D

E

F

Overall Function Check
PROCEDURE FOR MALFUNCTION B

UBS00JXL

G

Use this procedure to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st
trip DTC might not be confirmed. H
With GST

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

I

3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4. Let engine idle 1 minute.

5. Set voltmeter probes between ECM terminal 74 (HO2S2 signal) and ground.

J

6. Check the voltage when revving up to 4,000 rpm under no load

at least 10 times.

(Depress and release accelerator pedal as soon as possible.)

K

The voltage should be below 0.18V at least once during this

procedure.

If the voltage can be confirmed in step 6, step 7 is not nec-

L

essary.

7. Keep vehicle at idling for 10 minutes, then check the voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position with "OD" OFF (A/T models) 3rd gear position (M/T models). The voltage should be below 0.18V at least once during this procedure.

M
PBIB1197E

8. If NG, go to EC-853, "Diagnostic Procedure" .

Revision: December 2006

EC-851

2006 Sentra

Wiring Diagram

DTC P0138 HO2S2

[QR25DE]
UBS00JUM

Revision: December 2006

EC-852

BBWA1427E
2006 Sentra

DTC P0138 HO2S2

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

[Engine is running]

C

G Engine speed: Below 3,600 rpm after

the following conditions are met.

­ Engine: After warming up

0 - 1.0V

D

­ Keeping the engine speed between

25 W/B

Heated oxygen sensor 2 heater

3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load

E
[Ignition switch: ON]

G Engine stopped

BATTERY VOLTAGE

[Engine is running]

(11 - 14V)

F

G Engine speed: Above 3,600 rpm.

74 R/L

Heated oxygen sensor 2

[Engine is running]
G Revving engine from idle to 3,000 rpm quickly after the following conditions are met.
­ Engine: After warming up
­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load

0 - Approximately 1.0V

78 B

Sensor ground (Heated oxygen sensor 2)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

Diagnostic Procedure
PROCEDURE FOR MALFUNCTION A
1. CHECK GROUND CONNECTIONS

G
H
I
J
UBS0 0JU N
K

1. Turn ignition switch OFF.

2. Loosen and retighten engine two screws on the body.

L

Refer to EC-742, "Ground Inspection" .

M

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-853

BBIA0515E
2006 Sentra

DTC P0138 HO2S2
2. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Disconnect heated oxygen sensor 2 harness connector. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 78 and HO2S2
terminal 4. Refer to Wiring Diagram.
Continuity should exist. 4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
3. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 74 and HO2S2 terminal 1. Refer to Wiring Diagram.
Continuity should exist. 2. Check harness continuity between ECM terminal 74 or HO2S2 terminal 1 and ground.
Refer to Wiring Diagram.
Continuity should not exist. 3. Also check harness for short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK HO2S2 CONNECTOR FOR WATER
Check connectors for water. Water should not exist.
OK or NG OK >> GO TO 5. NG >> Repair or replace harness or connectors.
5. CHECK HEATED OXYGEN SENSOR 2
Refer to EC-856, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> Replace heated oxygen sensor 2.
6. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

[QR25DE]
BBIA0175E

>> INSPECTION END

Revision: December 2006

EC-854

2006 Sentra

DTC P0138 HO2S2
PROCEDURE FOR MALFUNCTION B
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF. 2. Loosen and retighten engine two screws on the body.
Refer to EC-742, "Ground Inspection" .

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. CLEAR THE SELF-LEARNING DATA
With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode
with CONSULT-II. 3. Clear the self-learning control coefficient by touching "CLEAR". 4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 detected? Is it difficult to start engine?

Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF.
3. Disconnect mass air flow sensor harness connector, and restart and run engine for at least 5 seconds at idle speed.
4. Stop engine and reconnect mass air flow sensor harness connector.
5. Make sure that DTC P0102 is displayed.
6. Erase the DTC memory. Refer to EC-653, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" .
7. Make sure that DTC P0000 is displayed.
8. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0172 detected? Is it difficult to start engine?
Yes or No
Yes >> Perform trouble diagnosis for DTC P0172. Refer to EC-875 . No >> GO TO 3.

Revision: December 2006

EC-855

[QR25DE]
A EC
C D E
BBIA0515E
F G H I J K
SEF215Z
L M
BBIA0130E
2006 Sentra

DTC P0138 HO2S2
3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 2 harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between ECM terminal 78 and HO2S2
terminal 4. Refer to Wiring Diagram.
Continuity should exist. 5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
4. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 74 and HO2S2 terminal 1. Refer to Wiring Diagram.
Continuity should exist. 2. Check harness continuity between ECM terminal 74 or HO2S2 terminal 1 and ground.
Refer to Wiring Diagram.
Continuity should not exist. 3. Also check harness for short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK HEATED OXYGEN SENSOR 2
Refer to EC-856, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> Replace heated oxygen sensor 2.
6. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

[QR25DE]
BBIA0175E

>> INSPECTION END

Component Inspection
HEATED OXYGEN SENSOR 2

UBS00JUO

With CONSULT-II

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4. Let engine idle for 1 minute.

Revision: December 2006

EC-856

2006 Sentra

DTC P0138 HO2S2
5. Select "FUEL INJECTION" in "ACTIVE TEST" mode, and select "HO2S2 (B1)" as the monitor item with CONSULT-II.

[QR25DE]
A

EC

6. Check "HO2S2 (B1)" at idle speed when adjusting "FUEL INJECTION" to ±25%.

C
PBIB1783E
D
E

F

G

PBIB2163E

"HO2S2 (B1)" should be above 0.78V at least once when the "FUEL INJECTION" is +25%.

H

"HO2S2 (B1)" should be below 0.18V at least once when the "FUEL INJECTION" is -25%.

CAUTION: G Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 I
in) onto a hard surface such as a concrete floor; use a new one.

G Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread

Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

J

Without CONSULT-II

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

K

3. Start engine and keep the engine speed at between 3,500 and 4,000 rpm for at least 1 minute under no

load.

4. Let engine idle for 1 minute.

L

5. Set voltmeter probes between ECM terminal 74 (HO2S2 signal) and ground.

6. Check the voltage when revving up to 4,000 rpm under no load

at least 10 times.

M

(Depress and release accelerator pedal as soon as possible.)

The voltage should be above 0.78V at least once during this

procedure.

If the voltage is above 0.78V at step 6, step 7 is not neces-

sary.

7. Keep vehicle idling for 10 minutes, then check voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position with "OD" OFF (A/T models) 3rd gear position (M/T models). The voltage should be below 0.18V at least once during this procedure.

PBIB1197E

8. If NG, replace heated oxygen sensor 2.

CAUTION: G Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.

G Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

Revision: December 2006

EC-857

2006 Sentra

DTC P0138 HO2S2
Removal and Installation
HEATED OXYGEN SENSOR 2 Refer to EM-113, "EXHAUST MANIFOLD AND THREE WAY CATALYST" .

[QR25DE]
UBS00JUP

Revision: December 2006

EC-858

2006 Sentra

DTC P0139 HO2S2
DTC P0139 HO2S2
Component Description
The heated oxygen sensor 2, after three way catalyst (manifold), monitors the oxygen level in the exhaust gas. Even if switching characteristics of the air fuel ratio (A/F) sensor 1 are shifted, the air-fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2. This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 2 is not used for engine control operation.

[QR25DE]
PFP:226A0
A
UBS00JUQ
EC
C
D

CONSULT-II Reference Value in Data Monitor Mode

SEF327R
E
UBS0 0JU R

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

F

HO2S2 (B1)

G Revving engine from idle to 3,000 rpm quickly after the following conditions 0 - 0.3V  Approx. 0.6 -

are met

1.0V

­ Engine: after warming up

G

HO2S2 MNTR (B1) ­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at LEAN  RICH idle for 1 minute under no load

On Board Diagnosis Logic

H
UBS00JUS

The heated oxygen sensor 2 has a much longer switching time

between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen storage capacity before the three way catalyst (manifold) causes

I

the longer switching time. To judge the malfunctions of heated oxy-

gen sensor 2, ECM monitors whether the switching response of the

sensor's voltage is faster than specified during the various driving

J

condition such as fuel-cut.

K

SEF302U
L

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

G Harness or connectors

M

(The sensor circuit is open or shorted.)

P0139 0139

Heated oxygen sensor 2 circuit slow response

It takes more time for the sensor to respond

G Heated oxygen sensor 2

between rich and lean than the specified time. G Fuel pressure

G Fuel injector

G Intake air leaks

Revision: December 2006

EC-859

2006 Sentra

DTC P0139 HO2S2

[QR25DE]

DTC Confirmation Procedure

UBS00JUT

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: For the best results, perform "DTC WORK SUPPORT" at a temperature of 0 to 30°C (32 to 86°F).

WITH CONSULT-II

1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.

2. Start engine and warm it up to normal operating temperature.

3. Turn ignition switch OFF and wait at least 10 seconds.

4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at lest 1 minute under no load.

5. Let engine idle for 1 minute.

6. Make sure that "COOLAN TEMP/S" indicates more than 70°C (158°F). If not, warm up engine and go to next step when "COOLAN TEMP/S" indication reaches to 70°C (158°F).

SEF174Y

7. Open engine hood.

8. Select "HO2S2 (B1) P0139" of "HO2S2" in "DTC WORK SUPPORT" mode with CONSULT-II and follow the instruction of CONSULT-II.

NOTE: It will take at most 10 minutes until "COMPLETED" is displayed.
9. Make sure that "OK" is displayed after touching "SELF-DIAG RESULTS". If "NG" is displayed, refer to EC-863, "Diagnostic Procedure" . If "CAN NOT BE DIAGNOSED" is displayed, perform the following.
a. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
b. Return to step 1.

PBIB2374E

Overall Function Check

UBS00JUU

Use this procedure to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st trip DTC might not be confirmed.

WITH GST 1. Start engine and warm it up to the normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. 4. Let engine idle for 1 minute. 5. Set voltmeter probes between ECM terminal 74 (HO2S2 signal) and ground.

Revision: December 2006

EC-860

2006 Sentra

DTC P0139 HO2S2
6. Check the voltage when revving up to 4,000 rpm under no load at least 10 times. (Depress and release accelerator pedal as soon as possible.) A change of voltage should be more than 0.15V for 1 second during this procedure. If the voltage can be confirmed in step 6, step 7 is not necessary.
7. Keep vehicle at idling for 10 minutes, then check the voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position with "OD" OFF (A/T models) 3rd gear position (M/T models). A change of voltage should be more than 0.15V for 1 second during this procedure.
8. If NG, go to EC-863, "Diagnostic Procedure" .

[QR25DE]
A EC
C
PBIB1197E
D E F G H I J K L M

Revision: December 2006

EC-861

2006 Sentra

Wiring Diagram

DTC P0139 HO2S2

[QR25DE]
UBS00JUV

Revision: December 2006

EC-862

BBWA1427E
2006 Sentra

DTC P0139 HO2S2

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

[Engine is running]

C

G Engine speed: Below 3,600 rpm after

the following conditions are met.

­ Engine: After warming up

0 - 1.0V

D

­ Keeping the engine speed between

25 W/B

Heated oxygen sensor 2 heater

3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load

E
[Ignition switch: ON]

G Engine stopped

BATTERY VOLTAGE

[Engine is running]

(11 - 14V)

F

G Engine speed: Above 3,600 rpm.

74 R/L

Heated oxygen sensor 2

78 B

Sensor ground (Heated oxygen sensor 2)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

[Engine is running] G Revving engine from idle to 3,000 rpm
quickly after the following conditions are met. ­ Engine: After warming up
­ Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load
[Engine is running]
G Warm-up condition G Idle speed

0 - Approximately 1.0V Approximately 0V

1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body. Refer to EC-742, "Ground Inspection" .

G H
I J
UBS00JUW
K L

M

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

BBIA0515E

Revision: December 2006

EC-863

2006 Sentra

DTC P0139 HO2S2
2. CLEAR THE SELF-LEARNING DATA
With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode
with CONSULT-II. 3. Clear the self-learning control coefficient by touching "CLEAR". 4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?

[QR25DE]

Without CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF. 3. Disconnect mass air flow sensor harness connector, and restart
and run engine for at least 5 seconds at idle speed. 4. Stop engine and reconnect mass air flow sensor harness con-
nector. 5. Make sure that DTC P0102 is displayed. 6. Erase the DTC memory. Refer to EC-653, "HOW TO ERASE
EMISSION-RELATED DIAGNOSTIC INFORMATION" . 7. Make sure that DTC P0000 is displayed. 8. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine? Yes or No Yes >> Perform trouble diagnosis for DTC P0171 or P0172. Refer to EC-867 or EC-875 . No >> GO TO 3.
3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 2 harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between ECM terminal 78 and HO2S2
terminal 4. Refer to Wiring Diagram.
Continuity should exist.
5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power
in harness or connectors.

SEF215Z BBIA0130E BBIA0175E

Revision: December 2006

EC-864

2006 Sentra

DTC P0139 HO2S2
4. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 74 and HO2S2 terminal 1. Refer to Wiring Diagram.
Continuity should exist. 2. Check harness continuity between ECM terminal 74 or HO2S2 terminal 1 and ground.
Refer to Wiring Diagram.
Continuity should not exist. 3. Also check harness for short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK HEATED OXYGEN SENSOR 2
Refer to EC-865, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> Replace heated oxygen sensor 2.
6. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

[QR25DE]
A EC
C D E F G H

>> INSPECTION END
Component Inspection
HEATED OXYGEN SENSOR 2 With CONSULT-II
1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.
2. Start engine and warm it up to the normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds. 4. Start engine and keep the engine speed between 3,500 and
4,000 rpm for at least 1 minute under no load. 5. Let engine idle for 1 minute.
6. Select "FUEL INJECTION" in "ACTIVE TEST" mode, and select "HO2S2 (B1)" as the monitor item with CONSULT-II.

I
UBS00JUX
J
K
L
M
SEF174Y

Revision: December 2006

EC-865

PBIB1783E
2006 Sentra

DTC P0139 HO2S2
7. Check "HO2S2 (B1)" at idle speed when adjusting "FUEL INJECTION" to ±25%.

[QR25DE]

PBIB2163E
"HO2S2 (B1)" should be above 0.78V at least once when the "FUEL INJECTION" is +25%. "HO2S2 (B1)" should be below 0.18V at least once when the "FUEL INJECTION" is -25%.
CAUTION: G Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
G Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

Without CONSULT-II

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4. Let engine idle for 1 minute.

5. Set voltmeter probes between ECM terminal 74 (HO2S2 signal) and ground.

6. Check the voltage when revving up to 4,000 rpm under no load at least 10 times. (Depress and release accelerator pedal as soon as possible.) The voltage should be above 0.78V at least once during this procedure. If the voltage is above 0.78V at step 6, step 7 is not necessary.

7. Keep vehicle idling for 10 minutes, then check voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position with "OD" OFF (A/T models) 3rd gear position (M/T models). The voltage should be below 0.18V at least once during this procedure.

PBIB1197E

8. If NG, replace heated oxygen sensor 2.

CAUTION: G Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.

G Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

Removal and Installation
HEATED OXYGEN SENSOR 2
Refer to EM-113, "EXHAUST MANIFOLD AND THREE WAY CATALYST" .

UBS00JUY

Revision: December 2006

EC-866

2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION

[QR25DE]

DTC P0171 FUEL INJECTION SYSTEM FUNCTION On Board Diagnosis Logic

PFP:16600
A
UBS00JUZ

With the Air-Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the air fuel ratio (A/F) sensor 1. The EC ECM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic). C

Sensor Air fuel ratio (A/F) sensor 1

Input Signal to ECM

ECM function

Actuator

D

Density of oxygen in exhaust gas (Mixture ratio feedback signal)

Fuel injection control

Fuel injector

DTC No.

Trouble diagnosis
name

DTC detecting condition

E
Possible Cause

G Intake air leaks

F

G Air fuel ratio (A/F) sensor 1

G Fuel injector

P0171 0171

Fuel injection system too lean

G Fuel injection system does not operate properly.
G The amount of mixture ratio compensation is too large. (The mixture ratio is too lean.)

G Exhaust gas leaks G Incorrect fuel pressure

G

G Lack of fuel

G Mass air flow sensor

H

G Incorrect PCV hose connection

DTC Confirmation Procedure

UBS00JV0

I

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

J

WITH CONSULT-II

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

K

3. Turn ignition switch ON and select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT-II.

4. Clear the self-learning control coefficient by touching "CLEAR".

L

5. Select "DATA MONITOR" mode with CONSULT-II.

6. Start engine again and let it idle for at least 10 minutes.

The 1st trip DTC P0171 should be detected at this stage, if a

M

malfunction exists. If so, go to EC-871, "Diagnostic Procedure" .

NOTE: If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.

a. Turn ignition switch OFF and wait at least 10 seconds.

b. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for 10 minutes. Refer to the table below. Hold the accelerator pedal as steady as possible.

SEF215Z

The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following conditions should be satisfied at the same time.

Engine speed Vehicle speed

Engine speed in the freeze frame data ± 400 rpm Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)

Revision: December 2006

EC-867

2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION

[QR25DE]

Engine coolant temperature (T) condition

When the freeze frame data shows lower than 70 °C (158 °F), T should be lower than 70 °C (158 °F).
When the freeze frame data shows higher than or equal to 70 °C (158 °F), T should be higher than or equal to 70 °C (158 °F).

7. If it is difficult to start engine at step 6, the fuel injection system has a malfunction, too.
8. Crank engine while depressing accelerator pedal. If engine starts, go to EC-871, "Diagnostic Procedure" . If engine does not start, check exhaust and intake air leak visually.

WITH GST

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Disconnect mass air flow sensor harness connector.

4. Restart engine and let it idle for at least 5 seconds.

5. Stop engine and reconnect mass air flow sensor harness connector.

6. Select Service $03 with GST. Make sure DTC P0102 is detected.

7. Select Service $04 with GST and erase the DTC P0102.

8. Start engine again and let it idle for at least 10 minutes.

9. Select Service $07 with GST. The 1st trip DTC P0171 should be detected at this stage, if a malfunction exists. If so, go to EC871, "Diagnostic Procedure" .

BBIA0130E

NOTE: If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.

a. Turn ignition switch OFF and wait at least 10 seconds.

b. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for 10 minutes. Refer to the table below. Hold the accelerator pedal as steady as possible.

The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following conditions should be satisfied at the same time.

Engine speed

Engine speed in the freeze frame data ± 400 rpm

Vehicle speed

Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)

Engine coolant temperature (T) condition

When the freeze frame data shows lower than 70 °C (158 °F), T should be lower than 70 °C (158 °F).
When the freeze frame data shows higher than or equal to 70 °C (158 °F), T should be higher than or equal to 70 °C (158 °F).

10. If it is difficult to start engine at step 8, the fuel injection system has a malfunction.
11. Crank engine while depressing accelerator pedal. If engine starts, go to EC-871, "Diagnostic Procedure" . If engine does not start, check exhaust and intake air leak visually.

Revision: December 2006

EC-868

2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION Wiring Diagram

[QR25DE]
UBS00JV1
A EC
C D E F G H I J K L M

Revision: December 2006

EC-869

BBWA2154E
2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION

[QR25DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

22 G/B 23 R/B 41 L/B 42 Y/B

Fuel injector No. 3 Fuel injector No. 1 Fuel injector No. 4 Fuel injector No. 2

[Engine is running] G Warm-up condition G Idle speed
[Engine is running] G Warm-up condition G Idle speed
[Engine is running] G Warm-up condition G Engine speed: 2,000 rpm

Approximately 3.1V Approximately 2.6V 2 - 3V 2 - 3V BATTERY VOLTAGE (11 - 14V)

PBIB1584E

BATTERY VOLTAGE (11 - 14V)

PBIB0529E

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

PBIB0530E

Revision: December 2006

EC-870

2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION
Diagnostic Procedure
1. CHECK EXHAUST AIR LEAK
1. Start engine and run it at idle. 2. Listen for an exhaust air leak before three way catalyst (manifold).

[QR25DE]
UBS00JV2
A
EC

C

D

OK or NG OK >> GO TO 2. NG >> Repair or replace.
2. CHECK FOR INTAKE AIR LEAK AND PCV HOSE

1. Listen for an intake air leak after the mass air flow sensor. 2. Check PCV hose connection. OK or NG
OK >> GO TO 3. NG >> Repair or replace.
3. CHECK AIR FUEL RATIO (A/F) SENSOR 1 CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector and ECM harness connector.
3. Check harness continuity between ECM terminals and A/F sensor 1 terminals as follows. Refer to Wiring Diagram.

ECM terminal 16 35 56 75

A/F sensor 1 1 5 6 2

E
PBIB1216E
F G H I J K L M
BBIA0304E

Continuity should exist.
4. Check harness continuity between ECM terminals 16, 35, 56, 75 and ground, or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to Wiring Diagram.
Continuity should not exist.
5. Also check harness for short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-871

2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION
4. CHECK FUEL PRESSURE

[QR25DE]

1. Release fuel pressure to zero. Refer to EC-673, "FUEL PRESSURE RELEASE" .
2. Install fuel pressure gauge and check fuel pressure. Refer to EC-674, "FUEL PRESSURE CHECK" .

At idling: Approximately 350 kPa (3.57 kg/cm2 , 51 psi)
OK or NG OK >> GO TO 6. NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART

Check the following. G Fuel pump and circuit (Refer to EC-1178, "FUEL PUMP" .) G Fuel pressure regulator (Refer to EC-673, "Fuel Pressure Check" .) G Fuel lines (Refer to EM-121, "FUEL INJECTOR AND FUEL TUBE" .) G Fuel filter for clogging

>> Repair or replace.
6. CHECK MASS AIR FLOW SENSOR

With CONSULT-II 1. Install all removed parts. 2. Check "MASS AIR FLOW" in "DATA MONITOR" mode with CONSULT-II.

at idling: at 2,500 rpm:

1.4 - 4.0 g·m/sec 4.0 - 10.0 g·m/sec

With GST 1. Install all removed parts. 2. Check mass air flow sensor signal in Service $01 with GST.

at idling: at 2,500 rpm:

1.4 - 4.0 g·m/sec 4.0 - 10.0 g·m/sec

OK or NG
OK >> GO TO 7. NG >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
ground. Refer to EC-768, "DTC P0101 MAF SENSOR" .

Revision: December 2006

EC-872

2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION
7. CHECK FUNCTION OF FUEL INJECTORS
With CONSULT-II 1. Start engine. 2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with
CONSULT-II. 3. Make sure that each circuit produces a momentary engine
speed drop.

[QR25DE]
A EC
C D

Without CONSULT-II
1. Start engine. 2. Listen to each fuel injector operating sound.
Clicking noise should be heard.

E
PBIB0133E
F
G

H

OK or NG OK >> GO TO 8. NG >> Perform trouble diagnosis for EC-1172, "FUEL INJECTOR" .
8. CHECK FUEL INJECTOR
1. Confirm that the engine is cooled down and there are no fire hazards near the vehicle. 2. Turn ignition switch OFF. 3. Disconnect all fuel injector harness connectors. 4. Remove fuel tube assembly. Refer to EM-121, "FUEL INJECTOR AND FUEL TUBE" .
Keep fuel hose and all fuel injectors connected to fuel tube. The fuel injector harness connectors should remain connected. 5. Disconnect all ignition coil harness connectors. 6. Prepare pans or saucers under each fuel injector. 7. Crank engine for about 3 seconds.Make sure that fuel sprays out from fuel injectors.
Fuel should be sprayed evenly for each fuel injector.
OK or NG OK >> GO TO 9. NG >> Replace fuel injectors from which fuel does not spray out. Always replace O-ring with new ones.

I
PBIB1986E
J
K
L
M

Revision: December 2006

EC-873

PBIB1726E
2006 Sentra

DTC P0171 FUEL INJECTION SYSTEM FUNCTION
9. CHECK INTERMITTENT INCIDENT
Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . >> INSPECTION END

[QR25DE]

Revision: December 2006

EC-874

2006 Sentra

DTC P0172 FUEL INJECTION SYSTEM FUNCTION

[QR25DE]

DTC P0172 FUEL INJECTION SYSTEM FUNCTION On Board Diagnosis Logic

PFP:16600
A
UBS00JV3

With the Air-Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the air fuel ratio (A/F) sensor 1. The EC ECM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (The actual mixture ratio is too rich.), the ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic). C

Sensor Air fuel ratio (A/F) sensor 1

Input Signal to ECM

ECM function

Actuator

D

Density of oxygen in exhaust gas (Mixture ratio feedback signal)

Fuel injection control

Fuel injector

DTC No.

Trouble diagnosis name

DTC detecting condition

E
Possible Cause

G Air fuel ratio (A/F) sensor 1

P0172 0172

Fuel injection system too rich

G Fuel injection system does not operate properly.
G The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.)

G Fuel injector G Exhaust gas leaks G Incorrect fuel pressure

F

G Mass air flow sensor

G

DTC Confirmation Procedure

UBS00JV4

NOTE:

H

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

WITH CONSULT-II

I

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

J

3. Turn ignition switch ON and select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CON-

SULT-II.

4. Clear the self-learning control coefficient by touching "CLEAR".

K

5. Select "DATA MONITOR" mode with CONSULT-II.

6. Start engine again and let it idle for at least 10 minutes.

The 1st trip DTC P0172 should be detected at this stage, if a malfunction exists. If so, go to EC-879, "Diagnostic Procedure" .

L

NOTE:

If 1st trip DTC is not detected during above procedure, perform-

ing the following procedure is advised.

M

a. Turn ignition switch OFF and wait at least 10 seconds.

b. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for a certain time. Refer to the table below. Hold the accelerator pedal as steady as possible.

SEF215Z

The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following conditions should be satisfied at the same time.

Engine speed Vehicle speed
Engine coolant temperature (T) condition

Engine speed in the freeze frame data ± 400 rpm
Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)
When the freeze frame data shows lower than 70 °C (158 °F), T should be lower than 70 °C (158 °F).
When the freeze frame data shows higher than or equal to 70 °C (158 °F), T should be higher than or equal to 70 °C (158 °F).

Revision: December 2006

EC-875

2006 Sentra

DTC P0172 FUEL INJECTION SYSTEM FUNCTION

[QR25DE]

7. If it is difficult to start engine at step 6, the fuel injection system has a malfunction, too.

8. Crank engine while depressing accelerator pedal. If engine starts, go to EC-879, "Diagnostic Procedure" . If engine does not start, remove spark plugs and check for fouling, etc.

WITH GST

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Disconnect mass air flow sensor harness connector. Then restart and run engine for at least 5 seconds at idle speed.

4. Stop engine and reconnect mass air flow sensor harness connector.

5. Select Service $03 with GST. Make sure DTC P0102 is detected.

6. Select Service $04 with GST and erase the DTC P0102.

7. Start engine again and let it idle for at least 10 minutes.

8. Select Service $07 with GST. The 1st trip DTC P0172 should be detected at this stage, if a malfunction exists. If so, go to EC879, "Diagnostic Procedure" .

BBIA0130E

NOTE: If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.

a. Turn ignition switch OFF and wait at least 10 seconds.

b. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for a certain time. Refer to the table below. Hold the accelerator pedal as steady as possible.

The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following conditions should be satisfied at the same time.

Engine speed

Engine speed in the freeze frame data ± 400 rpm

Vehicle speed

Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)

Engine coolant temperature (T) condition

When the freeze frame data shows lower than 70 °C (158 °F), T should be lower than 70 °C (158 °F).
When the freeze frame data shows higher than or equal to 70 °C (158 °F), T should be higher than or equal to 70 °C (158 °F).

9. If it is difficult to start engine at step 7, the fuel injection system has a malfunction.
10. Crank engine while depressing accelerator pedal. If engine starts, go to EC-879, "Diagnostic Procedure" . If engine does not start, remove ignition plugs and check for fouling, etc.

Revision: December 2006

EC-876

2006 Sentra

DTC P0172 FUEL INJECTION SYSTEM FUNCTION Wiring Diagram

[QR25DE]
UBS00JV5
A EC
C D E F G H I J K L M

Revision: December 2006

EC-877

BBWA2154E
2006 Sentra

DTC P0172 FUEL INJECTION SYSTEM FUNCTION

[QR25DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

22 G/B 23 R/B 41 L/B 42 Y/B

Fuel injector No. 3 Fuel injector No. 1 Fuel injector No. 4 Fuel injector No. 2

[Engine is running] G Warm-up condition G Idle speed
[Engine is running] G Warm-up condition G Idle speed
[Engine is running] G Warm-up condition G Engine speed: 2,000 rpm

Approximately 3.1V Approximately 2.6V 2 - 3V 2 - 3V BATTERY VOLTAGE (11 - 14V)

PBIB1584E

BATTERY VOLTAGE (11 - 14V)

PBIB0529E

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

PBIB0530E

Revision: December 2006

EC-878

2006 Sentra

DTC P0172 FUEL INJECTION SYSTEM FUNCTION
Diagnostic Procedure
1. CHECK FOR EXHAUST AIR LEAK
1. Start engine and run it at idle. 2. Listen for an exhaust air leak before three way catalyst (manifold).

[QR25DE]
UBS00JV6
A
EC

C

D

OK or NG OK >> GO TO 2. NG >> Repair or replace.
2. CHECK FOR INTAKE AIR LEAK

Listen for an intake air leak after the mass air flow sensor. OK or NG
OK >> GO TO 3. NG >> Repair or replace.
3. CHECK AIR FUEL RATIO (A/F) SENSOR 1 CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector and ECM harness connector.
3. Check harness continuity between ECM terminals and A/F sensor 1 terminals as follows. Refer to Wiring Diagram.

ECM terminal 16 35 56 75

A/F sensor 1 1 5 6 2

E
PBIB1216E
F G H I J K L M
BBIA0304E

Continuity should exist.
4. Check harness continuity between ECM terminals 16, 35, 56, 75 and ground, or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to Wiring Diagram.
Continuity should not exist.
5. Also check harness for short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-879

2006 Sentra

DTC P0172 FUEL INJECTION SYSTEM FUNCTION
4. CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to EC-673, "FUEL PRESSURE RELEASE" .
2. Install fuel pressure gauge and check fuel pressure.
At idling: Approximately 350 kPa (3.57 kg/cm2 , 51 psi) OK or NG
OK >> GO TO 6. NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following. G Fuel pump and circuit (Refer to EC-1178, "FUEL PUMP" .) G Fuel pressure regulator (Refer to EC-674, "FUEL PRESSURE CHECK" .) G Fuel lines (Refer to EM-121, "FUEL INJECTOR AND FUEL TUBE" .) G Fuel filter for clogging

[QR25DE]

>> Repair or replace.
6. CHECK MASS AIR FLOW SENSOR

With CONSULT-II 1. Install all removed parts. 2. Check "MASS AIR FLOW" in "DATA MONITOR" mode with CONSULT-II.

at idling

: 1.4 - 4.0 g·m/sec

at 2,500 rpm : 5.0 - 10.0 g·m/sec

With GST 1. Install all removed parts. 2. Check mass air flow sensor signal in Service $01 with GST.

at idling

: 1.4 - 4.0 g·m/sec

at 2,500 rpm : 5.0 - 10.0 g·m/sec

OK or NG
OK >> GO TO 7. NG >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
ground. Refer to EC-768, "DTC P0101 MAF SENSOR" .

Revision: December 2006

EC-880

2006 Sentra

DTC P0172 FUEL INJECTION SYSTEM FUNCTION
7. CHECK FUNCTION OF FUEL INJECTORS
With CONSULT-II 1. Start engine. 2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with
CONSULT-II. 3. Make sure that each circuit produces a momentary engine
speed drop.

[QR25DE]
A EC
C D

Without CONSULT-II 1. Start engine. 2. Listen to each fuel injector operating sound.
Clicking noise should be heard.

E
PBIB0133E
F
G

H

I

OK or NG OK >> GO TO 8. NG >> Perform trouble diagnosis for EC-1172, "FUEL INJECTOR" .
8. CHECK FUEL INJECTOR

PBIB1986E
J
K

1. Remove fuel tube assembly. Refer to EM-121, "FUEL INJECTOR AND FUEL TUBE" .

L

Keep fuel hose and all fuel injectors connected to fuel tube.

2. Confirm that the engine is cooled down and there are no fire hazards near the vehicle.

3. Disconnect all fuel injector harness connectors.

M

The fuel injector harness connectors should remain connected.

4. Disconnect all ignition coil harness connectors.

5. Prepare pans or saucers under each fuel injectors.

6. Crank engine for about 3 seconds. Make sure fuel does not drip from fuel injector.

OK or NG

OK (Does not drip.)>>GO TO 9. NG (Drips.)>>Replace the fuel injectors from which fuel is dripping. Always replace O-ring with new one.

9. CHECK INTERMITTENT INCIDENT

Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-881

2006 Sentra

DTC P0181 FTT SENSOR
DTC P0181 FTT SENSOR Component Description
The fuel tank temperature sensor is used to detect the fuel temperature inside the fuel tank. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the fuel temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

[QR25DE]
PFP:22630
UBS00JV7

BBIA0132E

<Reference data>

Fluid temperature °C (°F)

Voltage* V

Resistance k

20 (68)

3.5

2.3 - 2.7

50 (122)

2.2

0.79 - 0.90

*: This data is reference value and is measured between ECM terminal 107 (Fuel tank temperature sensor) and ground.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may damage the ECM's transistor. Use ground other than ECM, such as ground.
On Board Diagnosis Logic

SEF012P UBS00JV8

DTC No.
P0181 0181

Trouble diagnosis name

DTC detecting condition

Fuel tank temperature sensor circuit range/ performance

Rationally incorrect voltage from the sensor is sent to ECM, compared with the voltage signals from engine coolant temperature sensor and intake air temperature sensor.

Possible cause
G Harness or connectors (The sensor circuit is open or shorted)
G Fuel tank temperature sensor

DTC Confirmation Procedure

UBS00JV9

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II
1. Turn ignition switch ON.
2. Select "DATA MONITOR" mode with CONSULT-II.
3. Wait at least 10 seconds. If the result is NG, go to EC-885, "Diagnostic Procedure" . If the result is OK, go to following step.
4. Check "COOLAN TEMP/S" value. If the "COOLANT TEMP/S" is less than 60°C (140°F), the result will be OK. If the "COOLANT TEMP/S" is above 60°C (140°F), go to the following step.
5. Cool engine down until "COOLAN TEMP/S" signal is less than 60°C (140°F).
6. Wait at least 10 seconds.
7. If 1st trip DTC is detected, go to EC-885, "Diagnostic Procedure" .

SEF475Y

Revision: December 2006

EC-882

2006 Sentra

DTC P0181 FTT SENSOR
WITH GST Follow the procedure "WITH CONSULT-II" above.

[QR25DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-883

2006 Sentra

Wiring Diagram

DTC P0181 FTT SENSOR

[QR25DE]
UBS00JVA

Revision: December 2006

EC-884

BBWA1398E
2006 Sentra

DTC P0181 FTT SENSOR
Diagnostic Procedure
1. CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect "fuel level sensor unit and fuel pump" harness con-
nector. 3. Turn ignition switch ON.

[QR25DE]
UBS00JVB
A
EC
C

D

4. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 3. NG >> GO TO 2.

E
BBIA0132E
F G H

2. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness connectors B3, M16 G Harness for open or short between ECM and "fuel level sensor unit and fuel pump"

PBIB0932E
I J K

>> Repair open circuit or short to ground or short to power in harness or connector.

3. CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

L

1. Turn ignition switch OFF.

M

2. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 5 and ground.

Refer to Wiring Diagram.

Continuity should exist.
3. Also check harness for short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to power in harness or connectors.
4. CHECK FUEL TANK TEMPERATURE SENSOR

Refer to, EC-886, "Component Inspection" . OK or NG
OK >> GO TO 5. NG >> Replace fuel level sensor unit.

Revision: December 2006

EC-885

2006 Sentra

DTC P0181 FTT SENSOR

5. CHECK INTERMITTENT INCIDENT
Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
FUEL TANK TEMPERATURE SENSOR Check resistance by heating with hot water or heat gun as shown in the figure.

Temperature °C (°F) 20 (68) 50 (122)

Resistance k 2.3 - 2.7
0.79 - 0.90

[QR25DE]
UBS00JVC

Removal and Installation
FUEL TANK TEMPERATURE SENSOR
Refer to FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" .

PBIB0931E UBS00JVD

Revision: December 2006

EC-886

2006 Sentra

DTC P0182, P0183 FTT SENSOR
DTC P0182, P0183 FTT SENSOR Component Description
The fuel tank temperature sensor is used to detect the fuel temperature inside the fuel tank. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the fuel temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

[QR25DE]
PFP:22630
A
UBS00JVE
EC
C

D

<Reference data>

BBIA0132E
E

Fluid temperature °C (°F)

Voltage* V

Resistance k

20 (68)

3.5

2.3 - 2.7

50 (122)

2.2

0.79 - 0.90

*: This data is reference value and is measured between ECM terminal 107 (Fuel tank temperature sensor) and ground.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may damage the ECM's transistor. Use ground other than ECM, such as ground.
On Board Diagnosis Logic

F
G
H
SEF012P
I
UBS00JVF

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

J

P0182 0182
P0183 0183

Fuel tank temperature An excessively low voltage from the sensor is

sensor circuit low input sent to ECM.

G Harness or connectors

(The sensor circuit is open or shorted.)

Fuel tank temperature An excessively high voltage from the sensor is G Fuel tank temperature sensor

K

sensor circuit high input sent to ECM.

DTC Confirmation Procedure

UBS00JVG

L

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

M

WITH CONSULT-II

1. Turn ignition switch ON.

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Wait at least 5 seconds.

4. If 1st trip DTC is detected, go to EC-889, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

Revision: December 2006

EC-887

SEF174Y
2006 Sentra

Wiring Diagram

DTC P0182, P0183 FTT SENSOR

[QR25DE]
UBS00JVH

Revision: December 2006

EC-888

BBWA1398E
2006 Sentra

DTC P0182, P0183 FTT SENSOR
Diagnostic Procedure
1. CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect "fuel level sensor unit and fuel pump" harness con-
nector. 3. Turn ignition switch ON.

[QR25DE]
UBS00JVI
A
EC
C

D

4. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 3. NG >> GO TO 2.

E
BBIA0132E
F G H

2. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness connectors B3, M16 G Harness for open or short between ECM and "fuel level sensor unit and fuel pump"

PBIB0932E
I J K

>> Repair open circuit or short to ground or short to power in harness or connector.

3. CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

L

1. Turn ignition switch OFF.

M

2. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 5 and ground.

Refer to Wiring Diagram.

Continuity should exist.
3. Also check harness for short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to power in harness or connectors.
4. CHECK FUEL TANK TEMPERATURE SENSOR

Refer to, EC-890, "Component Inspection" . OK or NG
OK >> GO TO 5. NG >> Replace "fuel level sensor unit and fuel pump".

Revision: December 2006

EC-889

2006 Sentra

DTC P0182, P0183 FTT SENSOR

5. CHECK INTERMITTENT INCIDENT
Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
FUEL TANK TEMPERATURE SENSOR Check resistance by heating with hot water or heat gun as shown in the figure.

Temperature °C (°F) 20 (68) 50 (122)

Resistance k 2.3 - 2.7
0.79 - 0.90

If NG, replace "fuel level sensor unit and fuel pump".

[QR25DE]
UBS00JVJ

Removal and Installation
FUEL TANK TEMPERATURE SENSOR
Refer to FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" .

PBIB0931E UBS00JVK

Revision: December 2006

EC-890

2006 Sentra

DTC P0222, P0223 TP SENSOR

[QR25DE]

DTC P0222, P0223 TP SENSOR Component Description

PFP:16119
A
UBS0 0JD N

Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement. The throttle position sensor has two sensors. These sensors are a kind of potentiometers which transform the throttle valve position into output voltage, and emit the voltage signal to the ECM. In addition, these sensors detect the opening and closing speed of the throttle valve and feed the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.
CONSULT-II Reference Value in Data Monitor Mode

EC
C
D
PBIB0145E
E
UBS00JDO

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

F

THRTL SEN1

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released

More than 0.36V

THRTL SEN2*

G Shift lever: D (A/T), 1ST (M/T) Accelerator pedal: Fully depressed Less than 4.75V

G

*: Throttle position sensor 2 signal are converted by ECM internally. Thus, it differ from ECM terminals voltage signal.

On Board Diagnosis Logic
These self-diagnoses have the one trip detection logic.

UBS00JDP

H

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

I

P0222

Throttle position sensor An excessively low voltage from the TP sensor G Harness or connectors

0222

1 circuit low input

1 is sent to ECM.

(The TP sensor 1 circuit is open or

shorted.)

(APP sensor 2 circuit is shorted.)

J

P0223 0223

Throttle position sensor An excessively high voltage from the TP sen- G Electric throttle control actuator

1 circuit high input

sor 1 is sent to ECM.

(TP sensor 1)

G Accelerator pedal position sensor

K

(APP sensor 2)

FAIL-SAFE MODE

L

When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

Engine operation condition in fail-safe mode
M
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal condition.
So, the acceleration will be poor.

Revision: December 2006

EC-891

2006 Sentra

DTC P0222, P0223 TP SENSOR

[QR25DE]

DTC Confirmation Procedure

UBS00JDQ

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for 1 second. 4. If DTC is detected, go to EC-894, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-892

2006 Sentra

Wiring Diagram

DTC P0222, P0223 TP SENSOR

[QR25DE]
UBS0 0JD R
A EC
C D E F G H I J K L M

Revision: December 2006

EC-893

BBWA2156E
2006 Sentra

DTC P0222, P0223 TP SENSOR

[QR25DE]

TERMINAL NO.
47

WIRE COLOR
B

ITEM
Sensor power supply (Throttle position sensor)

50 W

Throttle position sensor 1

66 R

Sensor ground (Throttle position sensor)

69 G

Throttle position sensor 2

91 R/Y

Sensor power supply (Accelerator pedal position sensor 2)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

CONDITION
[Ignition switch: ON]
[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully depressed [Engine is running] G Warm-up condition G Idle speed [Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully depressed
[Ignition switch: ON]

DATA (DC Voltage) Approximately 5V More than 0.36V

Less than 4.75V Approximately 0V Less than 4.75V

More than 0.36V Approximately 5V

UBS00JDS

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-742, "Ground Inspection" .

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-894

BBIA0515E
2006 Sentra

DTC P0222, P0223 TP SENSOR
2. CHECK THROTTLE POSITION SENSOR 1 POWER SUPPLY CIRCUIT-I
1. Disconnect electric throttle control actuator harness connector. 2. Turn ignition switch ON.

[QR25DE]
A EC

C

3. Check voltage between electric throttle control actuator terminal 1 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 7. NG >> GO TO 3.

D
BBIA0103E
E
F
G

3. CHECK THROTTLE POSITION SENSOR 1 POWER SUPPLY CIRCUIT-II

PBIB0082E

H

1. Turn ignition switch OFF.

I

2. Disconnect ECM harness connector.

3. Check harness continuity between electric throttle control actuator terminal 1 and ECM terminal 47.

Refer to Wiring Diagram.

J

Continuity should exist.

OK or NG

K

OK >> GO TO 4.

NG >> Repair or replace open circuit.

4. CHECK THROTTLE POSITION SENSOR 1 POWER SUPPLY CIRCUIT-III

L

Check harness for short to power and short to ground, between the following terminals. M

ECM terminal

Sensor terminal

Reference Wiring Diagram

47

Electric throttle control actuator terminal 1

EC-893

91

APP sensor terminal 1

EC-1119

OK or NG
OK >> GO TO 5. NG >> Repair short to ground or short to power in harness or connectors.

5. CHECK APP SENSOR

Refer to EC-1124, "Component Inspection" .
OK or NG OK >> GO TO 11. NG >> GO TO 6.

Revision: December 2006

EC-895

2006 Sentra

DTC P0222, P0223 TP SENSOR
6. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. 2. Perform EC-670, "Accelerator Pedal Released Position Learning" . 3. Perform EC-671, "Throttle Valve Closed Position Learning" . 4. Perform EC-671, "Idle Air Volume Learning" .

[QR25DE]

>> INSPECTION END
7. CHECK THROTTLE POSITION SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 66 and electric throttle control actuator terminal 5.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 8. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK THROTTLE POSITION SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 50 and electric throttle control actuator terminal 4. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK THROTTLE POSITION SENSOR
Refer to EC-897, "Component Inspection" . OK or NG
OK >> GO TO 11. NG >> GO TO 10.
10. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. 2. Perform EC-671, "Throttle Valve Closed Position Learning" . 3. Perform EC-671, "Idle Air Volume Learning" .

>> INSPECTION END
11. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-896

2006 Sentra

DTC P0222, P0223 TP SENSOR

Component Inspection
THROTTLE POSITION SENSOR 1. Reconnect all harness connectors disconnected.
2. Perform EC-671, "Throttle Valve Closed Position Learning" .
3. Turn ignition switch ON.
4. Set shift lever to D position (A/T) or 1st position (M/T).
5. Check voltage between ECM terminals 50 (TP sensor 1 signal), 69 (TP sensor 2 signal) and ground under the following conditions.

Terminal

Accelerator pedal

Voltage

50 (Throttle position sensor 1)

Fully released Fully depressed

More than 0.36V Less than 4.75V

69 (Throttle position sensor 2)

Fully released Fully depressed

Less than 4.75V More than 0.36V

6. If NG, replace electric throttle control actuator and go to the next step.
7. Perform EC-671, "Throttle Valve Closed Position Learning" .
8. Perform EC-671, "Idle Air Volume Learning" .

Removal and Installation
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EM-108, "INTAKE MANIFOLD" .

[QR25DE]
UBS00JDT
A

EC

C

D

E

PBIB1060E

F

G
UBS0 0JD U
H

I

J

K

L

M

Revision: December 2006

EC-897

2006 Sentra

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MISFIRE
[QR25DE]

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MIS-

FIRE

PFP:00000

On Board Diagnosis Logic

UBS00JVL

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crankshaft position (CKP) sensor (POS) signal to vary, ECM can determine that a misfire is occurring.

Sensor

Input Signal to ECM

ECM function

Crankshaft position sensor (POS)

Engine speed

On board diagnosis of misfire

The misfire detection logic consists of the following two conditions.
1. One Trip Detection Logic (Three Way Catalyst Damage) On the first trip that a misfire condition occurs that can damage the three way catalyst (TWC) due to overheating, the MIL will blink. When a misfire condition occurs, the ECM monitors the CKP sensor signal every 200 engine revolutions for a change. When the misfire condition decreases to a level that will not damage the TWC, the MIL will turn off. If another misfire condition occurs that can damage the TWC on a second trip, the MIL will blink. When the misfire condition decreases to a level that will not damage the TWC, the MIL will remain on. If another misfire condition occurs that can damage the TWC, the MIL will begin to blink again.
2. Two Trip Detection Logic (Exhaust quality deterioration) For misfire conditions that will not damage the TWC (but will affect vehicle emissions), the MIL will only light when the misfire is detected on a second trip. During this condition, the ECM monitors the CKP sensor signal every 1,000 engine revolutions. A misfire malfunction can be detected on any one cylinder or on multiple cylinders.

DTC No.
P0300 0300
P0301 0301
P0302 0302
P0303 0303

Trouble diagnosis name

DTC detecting condition

Multiple cylinder misfire detected

Multiple cylinder misfire.

No.1 cylinder misfire detected

No. 1 cylinder misfires.

No. 2 cylinder misfire detected

No. 2 cylinder misfires.

No. 3 cylinder misfire detected

No. 3 cylinder misfires.

P0304 0304

No. 4 cylinder misfire detected

No. 4 cylinder misfires.

Possible cause
G Improper spark plug G Insufficient compression G Incorrect fuel pressure G The fuel injector circuit is open or
shorted G Fuel injector G Intake air leak G The ignition signal circuit is open or
shorted G Lack of fuel G Signal plate G Air fuel ratio (A/F) sensor 1 G Incorrect PCV hose connection

Revision: December 2006

EC-898

2006 Sentra

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MISFIRE
[QR25DE]

DTC Confirmation Procedure
CAUTION:

UBS00JVM
A

Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws when driv-

ing.

NOTE:

EC

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

WITH CONSULT-II

C

1. Turn ignition switch ON, and select "DATA MONITOR" mode

with CONSULT-II.

2. Start engine and warm it up to normal operating temperature.

D

3. Turn ignition switch OFF and wait at least 10 seconds.

4. Restart engine and let it idle for about 15 minutes.

E

5. If 1st trip DTC is detected, go to EC-900, "Diagnostic Procedure"

.

NOTE: If 1st trip DTC is not detected during above procedure, perform-

F

ing the following procedure is advised.

PBIB0164E

a. Turn ignition switch OFF and wait at least 10 seconds. G
b. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for a certain

time. Refer to the table below.

Hold the accelerator pedal as steady as possible. H

The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following con-

ditions should be satisfied at the same time.

I

Engine speed

Engine speed in the freeze frame data ± 400 rpm

Vehicle speed

Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)

When the freeze frame data shows lower than 70 °C (158 °F),

J

Engine coolant temperature

T should be lower than 70 °C (158 °F).

(T) condition

When the freeze frame data shows higher than or equal to 70 °C (158 °F),

T should be higher than or equal to 70 °C (158 °F).

K

The time to driving varies according to the engine speed in the freeze frame data.

Engine speed

Time

L

Around 1,000 rpm

Approximately 10 minutes

Around 2,000 rpm

Approximately 5 minutes

M

More than 3,000 rpm

Approximately 3.5 minutes

WITH GST Follow the procedure "WITH CONSULT-II" above.

Revision: December 2006

EC-899

2006 Sentra

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MISFIRE
[QR25DE]

Diagnostic Procedure
1. CHECK FOR INTAKE AIR LEAK AND PCV HOSE

UBS00JVN

1. Start engine and run it at idle speed. 2. Listen for the sound of the intake air leak. 3. Check PCV hose connection. OK or NG
OK >> GO TO 2. NG >> Discover air leak location and repair.
2. CHECK FOR EXHAUST SYSTEM CLOGGING

Stop engine and visually check exhaust tube, three way catalyst (manifold) and muffler for dents. OK or NG
OK >> GO TO 3. NG >> Repair or replace it.
3. PERFORM POWER BALANCE TEST

With CONSULT-II
1. Perform "POWER BALANCE" in "ACTIVE TEST" mode. 2. Is there any cylinder which does not produce a momentary
engine speed drop?

Without CONSULT-II When disconnecting each fuel injector harness connector one at a time, is there any cylinder which does not produce a momentary engine speed drop?

PBIB0133E

Yes or No
Yes >> GO TO 4. No >> GO TO 7.

BBIA0024E

Revision: December 2006

EC-900

2006 Sentra

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MISFIRE
[QR25DE]

4. CHECK FUEL INJECTOR A

Does each fuel injector make an operating sound at idle?

Yes or No

Yes >> GO TO 5.

EC

No >> Check fuel injector(s) and circuit(s). Refer to EC-1172,

"FUEL INJECTOR" .

C

D

5. CHECK FUNCTION OF IGNITION COIL-I

PBIB1986E
E

CAUTION:

Do the following procedure in the place where ventilation is good without the combustible.

1. Turn ignition switch OFF.

F

2. Remove fuel pump fuse located in fuse box to release fuel pres-

sure.

NOTE:

G

Do not use CONSULT-II to release fuel pressure, or fuel pres-

sure applies again during the following procedure.

3. Start engine.

H

4. After engine stalls, crank it 2 or 3 times to release all fuel pres-

sure.

5. Turn ignition switch OFF.

I

6. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
7. Remove ignition coil and spark plug of the cylinder to be checked.

LEC298
J

8. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.

9. Connect spark plug and harness connector to ignition coil.

K

10. Fix ignition coil using a rope etc. with gap of 13 - 17 mm

between the edge of the spark plug and grounded metal portion

as shown in the figure.

L

11. Crank engine for about three seconds, and check whether spark

is generated between the spark plug and the grounded metal

portion. M
Spark should be generated.

CAUTION: G Do not approach to the spark plug and the ignition coil
within 50cm. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20kV or more.

PBIB2325E

G It might cause to damage the ignition coil if the gap of more than 17 mm is taken.

NOTE: When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.

OK or NG

OK >> GO TO 9. NG >> GO TO 6.

Revision: December 2006

EC-901

2006 Sentra

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MISFIRE
[QR25DE]
6. CHECK FUNCTION OF IGNITION COIL-II
1. Turn ignition switch OFF. 2. Disconnect spark plug and connect a known-good spark plug. 3. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and
the grounded metal portion.
Spark should be generated.
OK or NG OK >> GO TO 7. NG >> Check ignition coil, power transistor and their circuits. Refer to EC-1184, "IGNITION SIGNAL" .
7. CHECK SPARK PLUGS
Check the spark plugs and check for fouling, etc. OK or NG
OK >> GO TO 8. NG >> Repair or replace spark plug (s) with standard type one
(s). For spark plug type ignition coil. Refer to MA-28, "Changing Spark Plugs (Double Platinum - Tipped Type)" .

8. CHECK FUNCTION OF IGNITION COIL-III

SEF156I

1. Reconnect the initial spark plugs. 2. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and
the grounded portion.
Spark should be generated.
OK or NG OK >> INSPECTION END NG >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to MA-28, "Changing Spark Plugs (Double Platinum - Tipped Type)" .
9. CHECK COMPRESSION PRESSURE

Check compression pressure. Refer to EM-148, "CHECKING COMPRESSION PRESSURE" . OK or NG
OK >> GO TO 10. NG >> Check pistons, piston rings, valves, valve seats and cylinder head gaskets.
10. CHECK FUEL PRESSURE

1. Install all removed parts. 2. Release fuel pressure to zero. Refer to EC-673, "FUEL PRESSURE RELEASE" . 3. Install fuel pressure gauge and check fuel pressure.
At idle: Approximately 350 kPa (3.57 kg/cm2 , 51 psi)
OK or NG OK >> GO TO 12. NG >> GO TO 11.

Revision: December 2006

EC-902

2006 Sentra

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MISFIRE
[QR25DE]

11. DETECT MALFUNCTIONING PART A

Check the following.

G Fuel pump and circuit (Refer to EC-1178, "FUEL PUMP" .)

G Fuel pressure regulator (Refer to EC-674, "FUEL PRESSURE CHECK" .)

EC

G Fuel lines (Refer to EM-121, "FUEL INJECTOR AND FUEL TUBE" .)

G Fuel filter for clogging C

>> Repair or replace.

12. CHECK IGNITION TIMING

D

Checking the following items. Refer to EC-664, "Basic Inspection" .

E

Items

Specifications

M/T

700 ± 50 rpm (in Neutral position)

Target idle speed

A/T

700 ± 50 rpm (in P or N position)

F

Ignition timing

M/T

15 ± 5° BTDC (in Neutral position)

A/T

15 ± 5° BTDC (in P or N position)

OK or NG

G

OK >> GO TO 13.
NG >> Follow the EC-664, "Basic Inspection" . H
13. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF.

I

2. Disconnect ECM harness connector and A/F sensor 1 harness

connector.

3. Check harness continuity between the following terminals. Refer

J

to Wiring Diagram.

A/F sensor 1 terminal 1 5 6 2

ECM terminal 16 35 56 75

K
L
BBIA0304E

Continuity should exist.

M

4. Check harness continuity between ECM terminals 16, 35, 56, 75 or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to Wiring Diagram.

Continuity should not exist.

5. Also check harness for short to power. OK or NG
OK >> GO TO 14. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
14. CHECK A/F SENSOR 1 HEATER

Refer to EC-756, "Component Inspection" .
OK or NG OK >> GO TO 15. NG >> Replace A/F sensor 1.

Revision: December 2006

EC-903

2006 Sentra

DTC P0300 - P0304 MULTIPLE CYLINDER MISFIRE, NO. 1 - 4 CYLINDER MISFIRE
[QR25DE]
15. CHECK MASS AIR FLOW SENSOR
With CONSULT-II Check "MASS AIR FLOW" in "DATA MONITOR" mode with CONSULT-II.
1.0 - 4.0 g·m/sec: at idling 4.0 - 10.0 g·m/sec: at 2,500 rpm
With GST Check mass air flow sensor signal in "Service $01" with GST.
1.0 - 4.0 g·m/sec: at idling 4.0 - 10.0 g·m/sec: at 2,500 rpm OK or NG OK >> GO TO 16. NG >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
ground. Refer to EC-768, "DTC P0101 MAF SENSOR" .
16. CHECK SYMPTOM MATRIX CHART
Check items on the rough idle symptom in EC-686, "Symptom Matrix Chart" . OK or NG
OK >> GO TO 17. NG >> Repair or replace.
17. ERASE THE 1ST TRIP DTC
Some tests may cause a 1st trip DTC to be set. Erase the 1st trip DTC from the ECM memory after performing the tests. Refer to EC-653, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" .
>> GO TO 18.
18. CHECK INTERMITTENT INCIDENT
Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END

Revision: December 2006

EC-904

2006 Sentra

DTC P0327, P0328 KS
DTC P0327, P0328 KS Component Description
The knock sensor is attached to the cylinder block. It senses engine knocking using a piezoelectric element. A knocking vibration from the cylinder block is sensed as vibrational pressure. This pressure is converted into a voltage signal and sent to the ECM.

[QR25DE]
PFP:22060
A
UBS00JDY
EC
C

D

On Board Diagnosis Logic

BBIA0291E
E
UBS00JDZ

The MIL will not light up for these diagnoses.

DTC No.

Trouble Diagnosis Name

DTC Detected Condition

Possible Cause

F

P0327

Knock sensor circuit An excessively low voltage from the sensor is

0327

low input

sent to ECM.

G Harness or connectors

(The sensor circuit is open or shorted.)

G

P0328 0328

Knock sensor circuit An excessively high voltage from the sensor is G Knock sensor

high input

sent to ECM.

DTC Confirmation Procedure

H
UBS00JE0

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

I

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II

J

1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.

2. Start engine and run it for at least 5 seconds at idle speed.

K

3. If 1st trip DTC is detected, go to EC-907, "Diagnostic Procedure"

.

L

M

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-905

2006 Sentra

Wiring Diagram

DTC P0327, P0328 KS

[QR25DE]
UBS00JE1

Revision: December 2006

EC-906

BBWA1462E
2006 Sentra

DTC P0327, P0328 KS

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

15 W

Knock sensor

[Engine is running] G Idle speed

Approximately 2.5V

C

Diagnostic Procedure
1. CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT-I

UBS00JE2
D

1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check resistance between ECM terminal 15 and ground. Refer to Wiring Diagram.
NOTE: It is necessary to use an ohmmeter which can measure more than 10 M.
Resistance: Approximately 530 - 590k [at 20°C (68°F)]
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> GO TO 2.
2. CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT-II
1. Disconnect knock sensor harness connector. 2. Check harness continuity between ECM terminal 15 and knock
sensor terminal 1. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
3. CHECK KNOCK SENSOR

E F G H I J K L
BBIA0291E
M

Refer to EC-908, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> Replace knock sensor.

Revision: December 2006

EC-907

2006 Sentra

DTC P0327, P0328 KS
4. CHECK GROUND CONNECTIONS
Loosen and retighten ground two screws on the body. Refer to EC-742, "Ground Inspection" .

[QR25DE]

OK or NG OK >> GO TO 5. NG >> Repair or replace ground connections.
5. CHECK KNOCK SENSOR SHIELD CIRCUIT FOR OPEN AND SHORT
1. Disconnect knock sensor harness connector. 2. Check harness continuity between knock sensor terminal 2 and ground.
Continuity should exist 3. Also check harness for short to power. OK or NG
OK >> GO TO 7. NG >> GO TO 6.
6. DETECT MALFUNCTIONING RART
Check the following. G Harness connectors F26, M58 G Harness for open or short between knock sensor terminal 2 and ground
>> Repair open circuit or short to power in harness or connectors.
7. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Component Inspection
KNOCK SENSOR Check resistance between knock sensor terminal 1 and ground. NOTE: It is necessary to use an ohmmeter which can measure more than 10 M.
Resistance: Approximately 530 - 590k [at 20°C (68°F)] CAUTION: Do not use any knock sensors that have been dropped or physically damaged. Use only new ones.

Revision: December 2006

EC-908

BBIA0515E
UBS00JE3 SEF227W
2006 Sentra

DTC P0327, P0328 KS
Removal and Installation
KNOCK SENSOR Refer to EM-164, "CYLINDER BLOCK" .

[QR25DE]
UBS00JE4
A EC
C D E F G H I J K L M

Revision: December 2006

EC-909

2006 Sentra

DTC P0335 CKP SENSOR (POS)
DTC P0335 CKP SENSOR (POS)
Component Description
The crankshaft position sensor (POS) is located on the cylinder block rear housing facing the gear teeth (cogs) of the signal plate at the end of the crankshaft. It detects the fluctuation of the engine revolution. The sensor consists of a permanent magnet and Hall IC. When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. Due to the changing magnetic field, the voltage from the sensor changes. The ECM receives the voltage signal and detects the fluctuation of the engine revolution. ECM receives the signals as shown in the figure.

[QR25DE]
PFP:23731
UBS00JE5
PBIB0562E

CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.

PBIB2382E UBS00JE6

MONITOR ITEM ENG SPEED

CONDITION

SPECIFICATION

G Run engine and compare the CONSULT-II value with tachometer indica- Almost the same speed as the

tion.

tachometer indication.

On Board Diagnosis Logic

UBS00JE7

DTC No.
P0335 0335

Trouble diagnosis name
Crankshaft position sensor (POS) circuit

DTC detecting condition
G The crankshaft position sensor (POS) signal is not detected by the ECM during the first few seconds of engine cranking.
G The proper pulse signal from the crankshaft position sensor (POS) is not sent to ECM while the engine is running.
G The crankshaft position sensor (POS) signal is not in the normal pattern during engine running.

Possible cause
G Harness or connectors (The sensor circuit is open or shorted)
G Crankshaft position sensor (POS) G Signal plate

Revision: December 2006

EC-910

2006 Sentra

DTC P0335 CKP SENSOR (POS)

[QR25DE]

DTC Confirmation Procedure

UBS00JE8

NOTE:

A

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

EC

Before performing the following procedure, confirm that battery voltage is more than 10.5V with igni-

tion switch ON.

WITH CONSULT-II

C

1. Turn ignition switch ON and select "DATA MONITOR" mode with

CONSULT-II.

2. Crank engine for at least 2 seconds and run it for at least 5 sec-

D

onds at idle speed.

3. If 1st trip DTC is detected, go to EC-913, "Diagnostic Procedure"

.

E

WITH GST Follow the procedure "WITH CONSULT-II" above.

F
SEF058Y
G
H

I

J

K

L

M

Revision: December 2006

EC-911

2006 Sentra

Wiring Diagram

DTC P0335 CKP SENSOR (POS)

[QR25DE]
UBS00JE9

Revision: December 2006

EC-912

BBWA2265E
2006 Sentra

DTC P0335 CKP SENSOR (POS)

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)
C

Approximately 3.0V

13*1 14*2

Y

[Engine is running] G Warm-up condition G Idle speed
Crankshaft position sensor (POS)
[Engine is running] G Engine speed: 2,000 rpm

D
E
PBIB0527E
Approximately 3.0V
F
G

111 W/G

ECM relay (Self shut-off)

[Engine is running] [Ignition switch: OFF]
G For a few seconds after turning ignition switch OFF

0 - 1.0V

PBIB0528E
H
I

[Ignition switch: OFF]

BATTERY VOLTAGE

G More than a few seconds after turning ignition switch OFF

(11 - 14V)

J

119 120

R/G

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE (11 - 14V)

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.) *1: Without NVIS (NATS). *2: With NVIS (NATS).
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-742, "Ground Inspection" .

K
L
UBS00NOO
M

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-913

BBIA0515E
2006 Sentra

DTC P0335 CKP SENSOR (POS)
2. CHECK CRANKSHAFT POSITION (CKP) SENSOR (POS) POWER SUPPLY CIRCUIT
1. Disconnect crankshaft position (CKP) sensor (POS) harness connector.
2. Turn ignition switch ON.

[QR25DE]

3. Check voltage between CKP sensor (POS) terminal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 4. NG >> GO TO 3.

BBIA0015E

3. DETECT MALFUNCTIONING PART
Check the following. G Harness for open or short between crankshaft position sensor (POS) and ECM G Harness for open or short between crankshaft position sensor (POS) and ECM relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK CKP (POS) GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Check harness continuity between CKP sensor (POS) terminal 3 and ground.
Refer to Wiring Diagram.
Continuity should exist. 3. Also check harness for and short to power. OK or NG
OK >> GO TO 6. NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors F26, M58 G Harness for open or short between crankshaft position sensor (POS) and ground.
>> Repair open circuit or short to power in harness or connectors.

PBIB0664E

Revision: December 2006

EC-914

2006 Sentra

DTC P0335 CKP SENSOR (POS)

[QR25DE]

6. CHECK CKP SENSOR (POS) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT A

1. Disconnect ECM harness connector.

2. Check harness continuity between ECM terminal 13 [Without NVIS (NATS)] or 14 [With NVIS (NATS)] and

CKP sensor (POS) terminal 2.

EC

Refer to Wiring Diagram.

Continuity should exist. C
3. Also check harness for short to ground and short to power.

OK or NG

OK >> GO TO 7.

D

NG >> Repair open circuit or short to ground or short to power in harness or connectors.

7. CHECK CRANKSHAFT POSITION SENSOR (POS) E

Refer to EC-915, "Component Inspection" .

OK or NG

OK >> GO TO 8.

F

NG >> Replace crankshaft position sensor (POS).

8. CHECK GEAR TOOTH

G

Visually check for chipping signal plate gear tooth.

OK or NG

H

OK >> GO TO 9.

NG >> Replace the signal plate.

9. CHECK INTERMITTENT INCIDENT

I

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Component Inspection
CRANKSHAFT POSITION SENSOR (POS) 1. Loosen the fixing bolt of the sensor. 2. Disconnect crankshaft position sensor (POS) harness connector. 3. Remove the sensor. 4. Visually check the sensor for chipping.

J

UBS0 0NO P

K

L

M

PBIB0563E

Revision: December 2006

EC-915

2006 Sentra

DTC P0335 CKP SENSOR (POS)

5. Check resistance as shown in the figure.

Terminal No. (Polarity)

Resistance  [at 25°C (77°F)]

1 (+) - 2 (-)

1 (+) - 3 (-)

Except 0 or 

2 (+) - 3 (-)

6. If NG, replace crankshaft position sensor (POS).

Removal and Installation
CRANKSHAFT POSITION SENSOR (POS)
Refer to EM-164, "CYLINDER BLOCK" .

[QR25DE]
PBIB0564E UBS00NOQ

Revision: December 2006

EC-916

2006 Sentra

DTC P0340 CMP SENSOR (PHASE)
DTC P0340 CMP SENSOR (PHASE)
Component Description
The camshaft position sensor (PHASE) senses the retraction with camshaft (intake) to identify a particular cylinder. The camshaft position sensor (PHASE) senses the piston position. When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor (PHASE) provides various controls of engine parts instead, utilizing timing of cylinder identification signals. The sensor consists of a permanent magnet and Hall IC. When engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. Due to the changing magnetic field, the voltage from the sensor changes. ECM receives the signals as shown in the figure.

[QR25DE]
PFP:23731
A
UBS00JED
EC
C
D
PBIB0562E
E
F

G

H

On Board Diagnosis Logic

PBIB2382E
I
UBS00JEE

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

J

G The cylinder No. signal is not sent to ECM for the first few seconds during engine

G Harness or connectors (The sensor circuit is open or shorted)

P0340 0340

Camshaft position sensor (PHASE) circuit

cranking.
G The cylinder No. signal is not set to ECM during engine running.

G Camshaft position sensor (PHASE) G Camshaft (Intake) G Starter motor (Refer to SC-18 .)

K

G The cylinder No. signal is not in the normal pattern during engine running.

G Starting system circuit (Refer to SC-7 .) G Dead (Weak) battery

L

M

Revision: December 2006

EC-917

2006 Sentra

DTC P0340 CMP SENSOR (PHASE)

[QR25DE]

DTC Confirmation Procedure

UBS00JEF

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10.5V with ignition switch ON.

WITH CONSULT-II 1. Turn ignition switch ON.
2. Select "DATA MONITOR" mode with CONSULT-II.
3. Crank engine for at least 2 seconds and run it for at least 5 seconds at idle speed.
4. If 1st trip DTC is detected, go to EC-920, "Diagnostic Procedure" . If 1st trip DTC is not detected, go to next step.
5. Maintaining engine speed at more than 800 rpm for at least 5 seconds.
6. If 1st trip DTC is detected, go to EC-920, "Diagnostic Procedure" .

SEF013Y

WITH GST Follow the procedure "WITH CONSULT-II" above.

Revision: December 2006

EC-918

2006 Sentra

Wiring Diagram

DTC P0340 CMP SENSOR (PHASE)

[QR25DE]
UBS00JEG
A EC
C D E F G H I J K L M

Revision: December 2006

EC-919

BBWA1417E
2006 Sentra

DTC P0340 CMP SENSOR (PHASE)

[QR25DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground. Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

1.0 - 4.0V

[Engine is running] G Warm-up condition G Idle speed

13*2 14*1

W/R

Camshaft position sensor (PHASE)

1.0 - 4.0V

PBIB0525E

[Engine is running] G Engine speed: 2,000 rpm.

111 W/G

ECM relay (Self shut-off)

119 120

R/G

Power supply for ECM

[Engine is running] [Ignition switch: OFF] G For a few seconds after turning ignition
switch OFF
[Ignition switch: OFF] G More than a few seconds after turning
ignition switch OFF
[Ignition switch: ON]

0 - 1.0V
BATTERY VOLTAGE (11 - 14V) BATTERY VOLTAGE (11 - 14V)

PBIB0526E

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.) *1: Without NVIS (NATS). *2: With NVIS (NATS).
Diagnostic Procedure
1. CHECK STARTING SYSTEM

UBS00JEH

Turn ignition switch to START position. Does the engine turn over? Does the starter motor operate?
Yes or No Yes >> GO TO 2. No >> Check starting system. (Refer to SC-7, "STARTING SYSTEM" .)

Revision: December 2006

EC-920

2006 Sentra

DTC P0340 CMP SENSOR (PHASE)

[QR25DE]

2. CHECK GROUND CONNECTIONS A
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body. Refer to EC-742, "Ground Inspection" . EC

C

D

OK or NG
OK >> GO TO 3. NG >> Repair or replace ground connections.

E
BBIA0515E
F

3. CHECK CAMSHAFT POSITION (CMP) SENSOR (PHASE) POWER SUPPLY CIRCUIT

G 1. Disconnect camshaft position (CMP) sensor (PHASE) harness
connector.

2. Turn ignition switch ON.

H

3. Check voltage between CMP sensor (PHASE) terminal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 5. NG >> GO TO 4.

I
J
BBIA0010E
K
L
M

4. DETECT MALFUNCTIONING PART
Check the following. G Harness for open or short between camshaft position sensor (PHASE) and ECM G Harness for open or short between camshaft position sensor (PHASE) and ECM relay
>> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB0664E

Revision: December 2006

EC-921

2006 Sentra

DTC P0340 CMP SENSOR (PHASE)
5. CHECK CMP SENSOR (PHASE) GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Check harness continuity between CMP sensor (PHASE) terminal 3 and ground.
Continuity should exist. 3. Also check harness for short to power. OK or NG
OK >> GO TO 7. NG >> GO TO 6.
6. DETECT MALFUNCTIONING PART
Check the following. G Harness connector F26, M58 G Harness for open or short between CMP sensor (PHASE) and ground.

[QR25DE]

>> Repair open circuit or short to power in harness or connectors.
7. CHECK CMP SENSOR (PHASE) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 14 [Without NVIS (NATS)] or 13 [With NVIS (NATS)] and
CMP sensor (PHASE) terminal 2. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 8. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK CAMSHAFT POSITION SENSOR (PHASE)
Refer to EC-923, "Component Inspection" . OK or NG
OK >> GO TO 9. NG >> Replace camshaft position sensor (PHASE).
9. CHECK CAMSHAFT (INTAKE)
Check the following. G Accumulation of debris to the signal plate of camshaft rear end G Chipping signal plate of camshaft rear end OK or NG
OK >> GO TO 10. NG >> Remove debris and clean the signal plate of camshaft
rear end or replace camshaft.

PBIB0565E

Revision: December 2006

EC-922

2006 Sentra

DTC P0340 CMP SENSOR (PHASE)
10. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Component Inspection
CAMSHAFT POSITION SENSOR (PHASE) 1. Loosen the fixing bolt of the sensor. 2. Disconnect camshaft position sensor (PHASE) harness connector. 3. Remove the sensor. 4. Visually check the sensor for chipping.

5. Check resistance as shown in the figure.

Terminal No. (Polarity) 1 (+) - 2 (-) 1 (+) - 3 (-) 2 (+) - 3 (-)

Resistance  [at 25°C (77°F)] Except 0 or 

Removal and Installation
CAMSHAFT POSITION SENSOR (PHASE)
Refer to EM-126, "CAMSHAFT" .

[QR25DE]
A

EC
UBS00JEI
C

D

E

F

G
PBIB0563E
H

I J

PBIB0564E

K

UBS00JEJ
L

M

Revision: December 2006

EC-923

2006 Sentra

DTC P0420 THREE WAY CATALYST FUNCTION
DTC P0420 THREE WAY CATALYST FUNCTION
On Board Diagnosis Logic
The ECM monitors the switching frequency ratio of air fuel ratio (A/F) sensor 1 and heated oxygen sensor 2. A three way catalyst (manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase. When the frequency ratio of air fuel ratio (A/F) sensor 1 and heated oxygen sensor 2 approaches a specified limit value, the three way catalyst (manifold) malfunction is diagnosed.

[QR25DE]
PFP:20905
UBS00JVO
SEF484YB

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0420 0420

Catalyst system efficiency below threshold

G Three way catalyst (manifold)

G Three way catalyst (manifold) does not operate properly.
G Three way catalyst (manifold) does not have enough oxygen storage capacity.

G Exhaust tube G Intake air leaks G Fuel injector G Fuel injector leaks G Spark plug

G Improper ignition timing

DTC Confirmation Procedure

UBS00JVP

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II

TESTING CONDITION: Do not hold engine speed for more than the specified minutes below.
1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.
2. Start engine and warm it up to normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 1 minute.
6. Make sure that "COOLAN TEMP/S" indicates more than 70°C (158°F).
7. Open engine hood.
8. Select "DTC & SRT CONFIRMATION" then "SRT WORK SUPPORT" mode with CONSULT-II.
9. Rev engine up to 2,500 to 3,500 rpm and hold it for 3 consecutive minutes, then release the accelerator pedal completely. If "CMPLT" of "CATALYST" changed to "COMPLT", go to STEP 12.
10. Wait 5 seconds at idle.

SEF189Y

Revision: December 2006

EC-924

PBIB1784E
2006 Sentra

DTC P0420 THREE WAY CATALYST FUNCTION
11. Rev engine up to 2,000 to 3,000 rpm and maintain it until "IMCMP" of "CATALYST" changes to "CMPLT" (it will take approximately 5 minutes). If not "CMPLT", stop engine and cool it down to less than 70°C (158°F) and then retest step 1.

[QR25DE]
A EC

12. Select "SELF-DIAG RESULTS" mode with CONSULT-II.
13. Confirm that the 1st trip DTC is not detected. If the 1st trip DTC is detected, go to EC-926, "Diagnostic Procedure" .

C
PBIB1785E
D
E
F

G

SEF535Z

Overall Function Check

UBS00JVQ

H

Use this procedure to check the overall function of the three way catalyst (Manifold). During this check, a DTC

might not be confirmed.

WITH GST

I

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds. 3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. J

4. Let engine idle for 1 minute.

5. Open engine hood. K
6. Set voltmeter probe between ECM terminal 74 and ground.

7. Keep engine speed at 2,500 rpm constant under no load.

8. Make sure that the voltage does not vary for more than 5 sec-

L

onds.

If the voltage fluctuation cycle takes less than 5 seconds, go to

EC-926, "Diagnostic Procedure" .

G 1 cycle: 0.6 - 1.0 V  0 - 0.3 V  0.6 - 1.0 V

M

PBIB1197E

Revision: December 2006

EC-925

2006 Sentra

DTC P0420 THREE WAY CATALYST FUNCTION
Diagnostic Procedure
1. CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dent. OK or NG
OK >> GO TO 2. NG >> Repair or replace.
2. CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle. 2. Listen for an exhaust gas leak before the three way catalyst (manifold).

[QR25DE]
UBS00JVR

OK or NG OK >> GO TO 3. NG >> Repair or replace.
3. CHECK INTAKE AIR LEAK

Listen for an intake air leak after the mass air flow sensor. OK or NG
OK >> GO TO 4. NG >> Repair or replace.
4. CHECK IGNITION TIMING

Check for ignition timing. Refer to EC-664, "Basic Inspection" .

Items

Specifications

Target idle speed

A/T

700 ± 50 rpm (in P or N position)

M/T

700 ± 50 rpm (in Neutral position)

Ignition timing

A/T

15 ± 5° BTDC (in P or N position)

M/T

15 ± 5° BTDC (in Neutral position)

OK or NG
OK >> GO TO 5. NG >> Follow the Basic Inspection.

PBIB1216E

Revision: December 2006

EC-926

2006 Sentra

DTC P0420 THREE WAY CATALYST FUNCTION
5. CHECK FUEL INJECTORS
1. Refer to Wiring Diagram for fuel injectors, EC-1173 . 2. Stop engine and then turn ignition switch ON. 3. Check voltage between ECM terminals 22, 23, 41, 42 and
ground with CONSULT-II or tester.
Battery voltage should exist. OK or NG
OK >> GO TO 6. NG >> Perform EC-1174, "Diagnostic Procedure" .

[QR25DE]
A EC
C D

E
MBIB0030E

6. CHECK FUNCTION OF IGNITION COIL-I

F CAUTION: Do the following procedure in the place where ventilation is good without the combustible.

1. Turn ignition switch OFF.

G

2. Remove fuel pump fuse located in fuse box to release fuel pres-

sure.

NOTE:

H

Do not use CONSULT-II to release fuel pressure, or fuel pres-

sure applies again during the following procedure.

3. Start engine.

I

4. After engine stalls, crank it 2 or 3 times to release all fuel pres-

sure.

5. Turn ignition switch OFF.
6. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.

J
LEC298

7. Remove ignition coil and spark plug of the cylinder to be checked.

K

8. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.

9. Connect spark plug and harness connector to ignition coil.

10. Fix ignition coil using a rope etc. with gap of 13 - 17 mm

L

between the edge of the spark plug and grounded metal portion

as shown in the figure.

11. Crank engine for about three seconds, and check whether spark

M

is generated between the spark plug and the grounded metal

portion.

Spark should be generated.

CAUTION: G Do not approach to the spark plug and the ignition coil
within 50cm. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20kV or more.

PBIB2325E

G It might cause to damage the ignition coil if the gap of more than 17 mm is taken.

NOTE: When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.

OK or NG

OK >> GO TO 10. NG >> GO TO 7.

Revision: December 2006

EC-927

2006 Sentra

DTC P0420 THREE WAY CATALYST FUNCTION
7. CHECK FUNCTION OF IGNITION COIL-II

[QR25DE]

1. Turn ignition switch OFF.
2. Disconnect spark plug and connect a known-good spark plug. 3. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and
the grounded metal portion.

Spark should be generated.
OK or NG OK >> GO TO 8. NG >> Check ignition coil, power transistor and their circuits. Refer to EC-1184, "IGNITION SIGNAL" .
8. CHECK SPARK PLUG

Check the initial spark plug for fouling, etc.
OK or NG
OK >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to MA-28, "Changing Spark Plugs (Double Platinum - Tipped Type)" .
NG >> 1. Repair or clean spark plug.
2. GO TO 9.

9. CHECK FUNCTION OF IGNITION COIL-III

SEF156I

1. Reconnect the initial spark plugs. 2. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and
the grounded portion.
Spark should be generated.
OK or NG OK >> INSPECTION END NG >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to MA-28, "Changing Spark Plugs (Double Platinum - Tipped Type)" .
10. CHECK FUEL INJECTOR

1. Turn ignition switch OFF. 2. Remove fuel tube assembly. Refer to EM-121, "FUEL INJECTOR AND FUEL TUBE" .
Keep fuel hose and all fuel injectors connected to fuel tube. 3. Disconnect ignition coil assembly harness connector. 4. Reconnect all fuel injector harness connectors. 5. Turn ignition switch ON.
Make sure fuel does not drip from fuel injector. OK or NG
OK (Does not drip)>>GO TO 11. NG (Drips)>>Replace the fuel injector(s) from which fuel is dripping.
11. CHECK INTERMITTENT INCIDENT

Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

Trouble is fixed>>INSPECTION END Trouble is not fixed>>Replace three way catalyst (manifold).

Revision: December 2006

EC-928

2006 Sentra

DTC P0441 EVAP CONTROL SYSTEM

[QR25DE]

DTC P0441 EVAP CONTROL SYSTEM System Description

PFP:14950
A
UBS00JVS

NOTE: If DTC P0441 is displayed with other DTC such as P2122, P2123 P2127, P2128, P2138, first perform EC trouble diagnosis for other DTC.

C

D

E

F

G

H
PBIB2359E
In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions. Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP canister purge volume control solenoid valve is open to admit purge flow. Purge flow exposes the EVAP con- I trol system pressure sensor to intake manifold vacuum.

On Board Diagnosis Logic

UBS00JVT

J

Under normal conditions (non-closed throttle), sensor output voltage indicates if pressure drop and purge flow

are adequate. If not, a malfunction is determined.

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

K

G EVAP canister purge volume control

solenoid valve stuck closed

G EVAP control system pressure sensor

L

and the circuit

G Loose, disconnected or improper con-

EVAP control system does not operate prop-

nection of rubber tube

M

P0441 0441

EVAP control system incorrect purge flow

erly, EVAP control system has a leak between intake manifold and EVAP control system pressure sensor.

G Blocked rubber tube G Cracked EVAP canister G EVAP canister purge volume control

solenoid valve circuit

G Accelerator pedal position sensor

G Blocked purge port

G EVAP canister vent control valve

Revision: December 2006

EC-929

2006 Sentra

DTC P0441 EVAP CONTROL SYSTEM

[QR25DE]

DTC Confirmation Procedure

UBS00JVU

CAUTION: Always drive vehicle at a safe speed.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Always perform test at a temperature of 5°C (41°F) or more.

WITH CONSULT-II

1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and let it idle for at least 70 seconds.
4. Select "PURG FLOW P0441" of "EVAPORATIVE SYSTEM" in "DTC CONFIRMATION" mode with CONSULT-II.
5. Touch "START". If "COMPLETED" is displayed, go to step 7.
6. When the following conditions are met, "TESTING" will be displayed on the CONSULT-II screen. Maintain the conditions continuously until "TESTING" changes to "COMPLETED". (It will take at least 35 seconds.)

Selector lever Vehicle speed ENG SPEED B/FUEL SCHDL Engine coolant temperature

Suitable position 32 - 120 km/h (20 - 75 MPH) 500 - 3,800 rpm 1.0 - 10.0 msec More than 0°C

PBIB0826E
If TESTING is not changed for a long time, retry from step 2. 7. Make sure that "OK" is displayed after touching "SELF-DIAG RESULTS". If "NG" is displayed, refer to EC-
931, "Diagnostic Procedure" .

Overall Function Check

UBS00JVV

Use this procedure to check the overall monitoring function of the EVAP control system purge flow monitoring. During this check, a 1st trip DTC might not be confirmed.

WITH GST

1. Lift up drive wheels. 2. Start engine and warm it up to normal operating temperature. 3. Turn ignition switch OFF, wait at least 10 seconds. 4. Start engine and wait at least 70 seconds.

Revision: December 2006

EC-930

2006 Sentra

DTC P0441 EVAP CONTROL SYSTEM
5. Set voltmeter probes to ECM terminals 32 (EVAP control system pressure sensor signal) and ground.
6. Check EVAP control system pressure sensor value at idle speed and note it.
7. Establish and maintain the following conditions for at least 1 minute.

[QR25DE]
A EC

Air conditioner switch

ON

C

Headlamp switch

ON

Rear window defogger switch Engine speed

ON Approx. 3,000 rpm

PBIB1109E
D

Shift lever

Any position other than P, N or R (A/T), Neutral (M/T)

8. Verify that EVAP control system pressure sensor value stays 0.1V less than the value at idle speed (mea- E sured at step 6) for at least 1 second.

9. If NG, go to EC-931, "Diagnostic Procedure" .

Diagnostic Procedure
1. CHECK EVAP CANISTER

F
UBS00JVW

1. Turn ignition switch OFF.

G

2. Check EVAP canister for cracks.

OK or NG

H

OK (With CONSULT-II)>>GO TO 2.

OK (Without CONSULT-II)>>GO TO 3.

NG >> Replace EVAP canister. I

2. CHECK PURGE FLOW

With CONSULT-II

J

1. Disconnect vacuum hose connected to EVAP canister purge

volume control solenoid valve at EVAP service port and install

vacuum gauge.

K

2. Start engine and let it idle.

3. Select "PURG VOL CONT/V" in "ACTIVE TEST" mode with

CONSULT-II.

L

4. Rev engine up to 2,000 rpm.

5. Touch "Qd" and "Qu" on CONSULT-II screen to adjust "PURG VOL CONT/V" opening and check vacuum existence.

PURG VOL CONT/V
100%
0%
OK or NG OK >> GO TO 7. NG >> GO TO 4.

VACUUM Should exist. should not exist.

M
BBIA0114E
PBIB1786E

Revision: December 2006

EC-931

2006 Sentra

DTC P0441 EVAP CONTROL SYSTEM
3. CHECK PURGE FLOW

[QR25DE]

Without CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Stop engine. 3. Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP ser-
vice port and install vacuum gauge. For the location of EVAP service port, refer to EC-627, "EVAPORATIVE EMISSION LINE DRAWING" . 4. Start engine and let it idle. Do not depress accelerator pedal even slightly. 5. Check vacuum gauge indication before 60 seconds passed after starting engine.
Vacuum should not exist.
6. Revving engine up to 2,000 rpm after 100 seconds passed after starting engine.
Vacuum should exist.
OK or NG OK >> GO TO 7. NG >> GO TO 4.
4. CHECK EVAP PURGE LINE

1. Turn ignition switch OFF. 2. Check EVAP purge line for improper connection or disconnection.
Refer to EC-627, "EVAPORATIVE EMISSION LINE DRAWING" . OK or NG
OK >> GO TO 5. NG >> Repair it.
5. CHECK EVAP PURGE HOSE AND PURGE PORT

1. Disconnect purge hoses connected to EVAP service port A and EVAP canister purge volume control solenoid valve B .
2. Blow air into each hose and EVAP purge port C .

3. Check that air flows freely.
OK or NG
OK (With CONSULT-II)>>GO TO 6. OK (Without CONSULT-II)>>GO TO 7. NG >> Repair or clean hoses and/or purge port.

Revision: December 2006

EC-932

SEF367U
SEF368U
2006 Sentra

DTC P0441 EVAP CONTROL SYSTEM
6. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
With CONSULT-II 1. Start engine. 2. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode with
CONSULT-II. Check that engine speed varies according to the valve opening. OK or NG OK >> GO TO 8. NG >> GO TO 7.

7. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to EC-951, "Component Inspection" . OK or NG
OK >> GO TO 8. NG >> Replace EVAP canister purge volume control solenoid valve.
8. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector. 2. Check connectors for water.
Water should not exist
OK or NG OK >> GO TO 9. NG >> Replace EVAP control system pressure sensor.
9. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR FUNCTION
Refer to DTC Confirmation Procedure for DTC P0452, EC-976 P0453, EC-983 . OK or NG
OK >> GO TO 10. NG >> Replace EVAP control system pressure sensor.
10. CHECK RUBBER TUBE FOR CLOGGING
1. Disconnect rubber tube connected to EVAP canister vent control valve. 2. Check the rubber tube for clogging. OK or NG
OK >> GO TO 11. NG >> Clean the rubber tube using an air blower.
11. CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to EC-964 . OK or NG
OK >> GO TO 12. NG >> Replace EVAP canister vent control valve.

Revision: December 2006

EC-933

[QR25DE]
A EC
C D E
PBIB1786E
F G H I J K L M
2006 Sentra

DTC P0441 EVAP CONTROL SYSTEM
12. CHECK EVAP PURGE LINE
Inspect EVAP purge line (pipe and rubber tube). Check for evidence of leaks. Refer to EC-627, "EVAPORATIVE EMISSION LINE DRAWING" . OK or NG
OK >> GO TO 13. NG >> Replace it.
13. CLEAN EVAP PURGE LINE
Clean EVAP purge line (pipe and rubber tube) using air blower.
>> GO TO 14.
14. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END

[QR25DE]

Revision: December 2006

EC-934

2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM

[QR25DE]

DTC P0442 EVAP CONTROL SYSTEM On Board Diagnosis Logic

PFP:14950
A
UBS00JVX

This diagnosis detects leaks in the EVAP purge line using engine intake manifold vacuum.

If pressure does not increase, the ECM will check for leaks in the line between the fuel tank and EVAP canister EC

purge volume control solenoid valve, under the following Vacuum test conditions.

The EVAP canister vent control valve is closed to shut the EVAP purge line off. The EVAP canister purge vol-

ume control solenoid valve will then be opened to depressurize the EVAP purge line using intake manifold

vacuum. After this occurs, the EVAP canister purge volume control solenoid valve will be closed.

C

D

E

F

G

H

PBIB2359E

I

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

G Incorrect fuel tank vacuum relief valve

J

G Incorrect fuel filler cap used

G Fuel filler cap remains open or fails to close.

G Foreign matter caught in fuel filler cap.

K

G Leak is in line between intake manifold and

EVAP canister purge volume control solenoid

valve.

L

G Foreign matter caught in EVAP canister vent

control valve.

G EVAP canister or fuel tank leaks

M

G EVAP purge line (pipe and rubber tube) leaks

P0442 0442

EVAP control system small leak detected (negative pressure)

EVAP control system has a leak, EVAP control system does not operate properly.

G EVAP purge line rubber tube bent G Loose or disconnected rubber tube G EVAP canister vent control valve and the circuit

G EVAP canister purge volume control solenoid valve and the circuit

G Fuel tank temperature sensor

G O-ring of EVAP canister vent control valve is missing or damaged

G EVAP canister is saturated with water

G EVAP control system pressure sensor

G Fuel level sensor and the circuit

G Refueling EVAP vapor cut valve

G Refueling control valve

G ORVR system leaks

Revision: December 2006

EC-935

2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM

[QR25DE]

CAUTION: G Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used,
the MIL may come on.
G If the fuel filler cap is not tightened properly, the MIL may come on.
G Use only a genuine NISSAN rubber tube as a replacement.

DTC Confirmation Procedure

UBS00JVY

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION:
G Perform "DTC WORK SUPPORT" when the fuel level is between 1/4 and 3/4 full, and vehicle is placed on flat level surface.
G Always perform test at a temperature of 0 to 30°C (32 to 86°F).
G Open engine hood before conducting following procedure.

WITH CONSULT-II

1. Turn ignition switch ON.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.
4. Check the following conditions are met. COOLAN TEMP/S: 0 - 70°C (32 - 158°F) INT/A TEMP SE: 0 - 30°C (32 - 86°F)

SEF475Y
5. Select "EVAP SML LEAK P0442/P1442" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT-II. Follow the instruction displayed.

PBIB0829E
NOTE: If the engine speed cannot be maintained within the range displayed on the CONSULT-II screen, go to EC-664, "Basic Inspection" .

Revision: December 2006

EC-936

2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM
6. Make sure that "OK" is displayed. If "NG" is displayed, refer to EC-938, "Diagnostic Procedure" . NOTE: Make sure that EVAP hoses are connected to the EVAP canister purge volume control solenoid valve properly.
WITH GST NOTE: Be sure to read the explanation of EC-651, "Driving Pattern" before driving vehicle. 1. Start engine. 2. Drive vehicle according to EC-651, "Driving Pattern" 3. Stop vehicle. 4. Turn ignition switch OFF, wait at least 10 seconds and then turn ignition switch ON. 5. Select Service $07 with GST. ­ If P0442 is displayed on the screen, go to EC-938, "Diagnostic Procedure" . ­ If P0441 is displayed on the screen, go to EC-931, "Diagnostic Procedure" .

[QR25DE]
A EC
C
SEC763C
D E F G H I J K L M

Revision: December 2006

EC-937

2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM
Diagnostic Procedure
1. CHECK FUEL FILLER CAP DESIGN
1. Turn ignition switch OFF. 2. Check for genuine NISSAN fuel filler cap design. OK or NG
OK >> GO TO 2. NG >> Replace with genuine NISSAN fuel filler cap.

[QR25DE]
UBS00JVZ

2. CHECK FUEL FILLER CAP INSTALLATION
Check that the cap is tightened properly by rotating the cap clockwise. OK or NG
OK >> GO TO 3. NG >> 1. Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.
2. Retighten until reteaching sound is heard.
3. CHECK FUEL FILLER CAP FUNCTION
Check for air releasing sound while opening the fuel filler cap. OK or NG
OK >> GO TO 5. NG >> GO TO 4.
4. CHECK FUEL TANK VACUUM RELIEF VALVE
Refer to EC-629, "FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FULLER CAP)" . OK or NG
OK >> GO TO 5. NG >> Replace fuel filler cap with a genuine one.

SEF915U

Revision: December 2006

EC-938

2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM
5. INSTALL THE PRESSURE PUMP
To locate the EVAP leak, install EVAP service port adapter and pressure pump to EVAP service port securely. NOTE: Improper installation of the EVAP service port adapter to the EVAP service port may cause leaking.

With CONSULT-II>>GO TO 6. Without CONSULT-II>>GO TO 7.
6. CHECK FOR EVAP LEAK
With CONSULT-II 1. Turn ignition switch ON. 2. Select "EVAP SYSTEM CLOSE" of "WORK SUPPORT" mode
with CONSULT-II. 3. Touch "START" and apply pressure into the EVAP line until the
pressure indicator reaches the middle of the bar graph. CAUTION: G Never use compressed air or a high pressure pump. G Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pres-
sure in the system.
4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. Refer to EC-627, "EVAPORATIVE EMISSION LINE DRAWING" .
OK or NG OK >> GO TO 8. NG >> Repair or replace.

Revision: December 2006

EC-939

[QR25DE]
A EC

C
D
BBIA0114E
E

F

G

SEF916U

H

I J

K L

M

PEF917U

SEF200U
2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM
7. CHECK FOR EVAP LEAK

[QR25DE]

Without CONSULT-II 1. Turn ignition switch OFF. 2. Apply 12 volts DC to EVAP canister vent control valve. The valve will close. (Continue to apply 12 volts
until the end of test.)

BBIA0292E
3. Pressurize the EVAP line using pressure pump with 1.3 to 2.7 kPa (10 to 20 mmHg, 0.39 to 0.79 inHg), then remove pump and EVAP service port adapter. CAUTION: G Never use compressed air or a high pressure pump. G Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pressure in the system.
4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. Refer to EC-627, "EVAPORATIVE EMISSION LINE DRAWING" .
OK or NG OK >> GO TO 8. NG >> Repair or replace.

8. CHECK EVAP CANISTER VENT CONTROL VALVE
Check the following, G EVAP canister vent control valve is installed properly.
Refer to EC-630, "Removal and Installation" . G EVAP canister vent control valve.
Refer to EC-629, "Component Inspection" . OK or NG
OK >> GO TO 9. NG >> Repair or replace EVAP canister vent control valve and O-ring.

SEF200U

Revision: December 2006

EC-940

2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM

[QR25DE]

9. CHECK IF EVAP CANISTER SATURATED WITH WATER A

1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.

2. Does water drain from the EVAP canister?

EC

Yes or No

Yes >> GO TO 10.

No (With CONSULT-II)>>GO TO 12.

C

No (Without CONSULT-II)>>GO TO 13.

D

PBIB1213E

E

10. CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor F

attached.

The weight should be less than 1.9 kg (4.2 lb).

OK or NG

G

OK (With CONSULT-II)>>GO TO 12.

OK (Without CONSULT-II)>>GO TO 13.

NG >> GO TO 11.

H

11. DETECT MALFUNCTIONING PART

Check the following.

I

G EVAP canister for damage

G EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

J

>> Repair hose or replace EVAP canister.

12. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

K

With CONSULT-II

L

1. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.

2. Start engine.

3. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode.

M

4. Touch "Qu" on CONSULT-II screen to increase "PURG VOL CONT/V" opening to 100%.

5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

OK or NG

OK >> GO TO 15. NG >> GO TO 14.

PBIB1786E

Revision: December 2006

EC-941

2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM

[QR25DE]

13. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

Without CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Stop engine. 3. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port. 4. Start engine and let it idle for at least 80 seconds. 5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.
Vacuum should exist.
OK or NG OK >> GO TO 16. NG >> GO TO 14.
14. CHECK VACUUM HOSE
Check vacuum hoses for clogging or disconnection. Refer to EC-695, "Vacuum Hose Drawing" . OK or NG
OK >> GO TO 15. NG >> Repair or reconnect the hose.
15. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to EC-629, "Component Inspection" . OK or NG
OK >> GO TO 16. NG >> Replace EVAP canister purge volume control solenoid valve.
16. CHECK FUEL TANK TEMPERATURE SENSOR
Refer to EC-886, "Component Inspection" . OK or NG
OK >> GO TO 17. NG >> Replace fuel level sensor unit.
17. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-975, "Component Inspection" . OK or NG
OK >> GO TO 18. NG >> Replace EVAP control system pressure sensor.
18. CHECK EVAP PURGE LINE
Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection. Refer to EC-626, "EVAPORATIVE EMISSION SYSTEM" . OK or NG
OK >> GO TO 19. NG >> Repair or reconnect the hose.
19. CLEAN EVAP PURGE LINE
Clean EVAP purge line (pipe and rubber tube) using air blower.

>> GO TO 20.

Revision: December 2006

EC-942

2006 Sentra

DTC P0442 EVAP CONTROL SYSTEM

[QR25DE]

20. CHECK EVAP/ORVR LINE A

Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper connection. For location, refer to EC-633, "ON BOARD REFUELING VAPOR RECOVERY (ORVR)" .

OK or NG

EC

OK >> GO TO 21. NG >> Repair or replace hoses and tubes.

21. CHECK SIGNAL LINE AND RECIRCULATION LINE

C

Check signal line and recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, loose-

ness and improper connection.

D

OK or NG

OK >> GO TO 22.

NG >> Repair or replace hoses, tubes or filler neck tube.

E

22. CHECK REFUELING CONTROL VALVE

F Refer to EC-636, "Component Inspection" .

OK or NG

OK >> GO TO 23.

G

NG >> Replace refueling control valve with fuel tank.

23. CHECK REFUELING EVAP VAPOR CUT VALVE H

Refer to EC-636, "Component Inspection" .

OK or NG

OK >> GO TO 24.

I

NG >> Replace refueling EVAP vapor cut valve with fuel tank.

24. CHECK FUEL LEVEL SENSOR

J

Refer to FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" .

OK or NG

K

OK >> GO TO 25.

NG >> Replace fuel level sensor unit.

25. CHECK INTERMITTENT INCIDENT

L

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . M
>> INSPECTION END

Revision: December 2006

EC-943

2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QR25DE]

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

PFP:14920

Description
SYSTEM DESCRIPTION

UBS00JY3

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS) Camshaft position sensor (PHASE)

Engine speed*1

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Battery Throttle position sensor Accelerator pedal position sensor

Battery voltage*1 Throttle position Accelerator pedal position

EVAP canister purge flow control

EVAP canister purge volume control solenoid valve

Air fuel ratio (A/F) sensor 1

Density of oxygen in exhaust gas (Mixture ratio feedback signal)

Fuel tank temperature sensor

Fuel temperature in fuel tank

Vehicle speed sensor

Vehicle speed*2

*1: ECM determines the start signal status by the signals of engine speed and battery voltage. *2: This signal is sent to the ECM though CAN communication line.

This system controls flow rate of fuel vapor from the EVAP canister. The opening of the vapor by-pass passage in the EVAP canister purge volume control solenoid valve changes to control the flow rate. The EVAP canister purge volume control solenoid valve repeats ON/OFF operation according to the signal sent from the ECM. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor from the EVAP canister is regulated as the air flow changes.

COMPONENT DESCRIPTION
The EVAP canister purge volume control solenoid valve uses a ON/ OFF duty to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge volume control solenoid valve is moved by ON/OFF pulses from the ECM. The longer the ON pulse, the greater the amount of fuel vapor that will flow through the valve.

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

CONDITION

PURG VOL C/V

G Engine: After warming up G Shift lever: P or N (A/T), Neu-
tral (M/T) G Air conditioner switch: OFF G No-load

Idle (Accelerator pedal: Not depressed even slightly, after engine starting)
2,000 rpm

SEF337U UBS00JY4
SPECIFICATION 0%
--

Revision: December 2006

EC-944

2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QR25DE]

On Board Diagnosis Logic
DTC No. Trouble diagnosis name

DTC detecting condition

P0443 0443

EVAP canister purge volume control solenoid valve

The canister purge flow is detected during the specified driving conditions, even when EVAP canister purge volume control solenoid valve is completely closed.

Possible cause

UBS00JY5
A

G EVAP control system pressure sensor

G EVAP canister purge volume control

EC

solenoid valve

(The valve is stuck open.)

G EVAP canister vent control valve

C

G EVAP canister

G Hoses

(Hoses are connected incorrectly or clogged.)

D

DTC Confirmation Procedure

UBS00JY6

NOTE:

E

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

F

Always perform test at a temperature of 5°C (41°F) or more.

WITH CONSULT-II

1. Start engine and warm it up to normal operating temperature.

G

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Turn ignition switch ON. 4. Select "PURG VOL CN/V P1444" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with H
CONSULT-II.

5. Touch "START". I

J

K

L
PBIB0839E

6. Start engine and let it idle until "TESTING" on CONSULT-II changes to "COMPLETED". (It will take

approximately 10 seconds.)

M

If "TESTING" is not displayed after 5 minutes, retry from step 2.

7. Make sure that "OK" is displayed after touching "SELF-DIAG RESULTS". If "NG" is displayed, refer to EC948, "Diagnostic Procedure" .

WITH GST 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Start engine and let it idle for at least 20 seconds. 4. Select Service $07 with GST. 5. If 1st trip DTC is detected, go to EC-948, "Diagnostic Procedure" .

Revision: December 2006

EC-945

2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QR25DE]

Wiring Diagram

UBS00JY7

Revision: December 2006

EC-946

BBWA1418E
2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)
C
BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

D

G Idle speed

G Accelerator pedal: Not depressed even

slightly, after engine starting

E

45 GY/L

EVAP canister purge volume control solenoid valve

PBIB0050E

Approximately 10V

F

[Engine is running]

G Engine speed: About 2,000 rpm (More

G

than 100 seconds after starting engine)

111 W/G

ECM relay (Self shut-off)

PBIB0520E

H

[Engine is running]

[Ignition switch: OFF]

0 - 1.0V G For a few seconds after turning ignition

I

switch OFF

[Ignition switch: OFF]

G More than a few seconds after turning

BATTERY VOLTAGE (11 - 14V)

J

ignition switch OFF

119 120

R/G

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE

(11 - 14V)

K

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

L

M

Revision: December 2006

EC-947

2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QR25DE]

Diagnostic Procedure

UBS00JY8

1. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE POWER SUPPLY CIR-

CUIT

1. Turn ignition switch OFF. 2. Disconnect EVAP canister purge volume control solenoid valve
harness connector.
3. Turn ignition switch ON.

4. Check voltage between EVAP canister purge volume control solenoid valve terminal 1 and engine ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 3. NG >> GO TO 2.

BBIA0115E

2. DETECT MALFUNCTIONING PART

PBIB0080E

Check the following. G Harness for open or short between EVAP canister purge volume control solenoid valve and ECM relay G Harness for open or short between EVAP canister purge volume control solenoid valve and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.
3. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OUTPUT SIGNAL CIR-
CUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 45 and EVAP canister purge volume control solenoid
valve terminal 2. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-948

2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QR25DE]
4. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR A 1. Disconnect EVAP control system pressure sensor harness connector.
EC

C

2. Check connectors for water.
Water should not exist.
OK or NG OK >> GO TO 5. NG >> Replace EVAP control system pressure sensor.
5. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-975, "Component Inspection" . OK or NG
OK (With CONSULT-II)>>GO TO 6. OK (Without CONSULT-II)>>GO TO 7. NG >> Replace EVAP control system pressure sensor.
6. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
With CONSULT-II 1. Turn ignition switch OFF. 2. Reconnect harness connectors disconnected. 3. Start engine. 4. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode with
CONSULT-II. Check that engine speed varies according to the valve opening. OK or NG OK >> GO TO 8. NG >> GO TO 7.

D
BBIA0292E
E F G H I J K L M

7. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to EC-951, "Component Inspection" . OK or NG
OK >> GO TO 8. NG >> Replace EVAP canister purge volume control solenoid valve.

PBIB1786E

Revision: December 2006

EC-949

2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QR25DE]
8. CHECK RUBBER TUBE FOR CLOGGING
1. Disconnect rubber tube connected to EVAP canister vent control valve. 2. Check the rubber tube for clogging. OK or NG
OK >> GO TO 9. NG >> Clean the rubber tube using an air blower.
9. CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to EC-629, "Component Inspection" . OK or NG
OK >> GO TO 10. NG >> Replace EVAP canister vent control valve.
10. CHECK IF EVAP CANISTER SATURATED WITH WATER
1. Remove EVAP canister with EVAP canister vent control valve attached. 2. Check if water will drain from the EVAP canister. YES or NO
YES >> GO TO 11. NO >> GO TO 13.

11. CHECK EVAP CANISTER

PBIB1213E

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor attached.
The weight should be less than 1.9 kg (4.2 lb).
OK or NG OK >> GO TO 13. NG >> GO TO 12.
12. DETECT MALFUNCTIONING PART

Check the following. G EVAP canister for damage G EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

>> Repair hose or replace EVAP canister.
13. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-950

2006 Sentra

DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QR25DE]

Component Inspection
EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
With CONSULT-II
Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions.

UBS00JY9
A
EC

Condition

Air passage continuity

(PURG VOL CONT/V value)

between A and B

C

100%

Yes

0%

No

D

Without CONSULT-II
Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions.

Condition
12V direct current supply between terminals 1 and 2 No supply

Air passage continuity between A and B
Yes
No

Removal and Installation
EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to EM-108, "INTAKE MANIFOLD" .

PBIB0149E
E
F
G H
PBIB0150E
I
UBS00JYA
J

K

L

M

Revision: December 2006

EC-951

2006 Sentra

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QR25DE]

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID

VALVE

PFP:14920

Description
SYSTEM DESCRIPTION

UBS00JW0

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS) Camshaft position sensor (PHASE)

Engine speed*1

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor Battery Throttle position sensor

Engine coolant temperature Battery voltage*1 Throttle position

EVAP canister purge flow control

EVAP canister purge volume control solenoid valve

Accelerator pedal position sensor

Accelerator pedal position

Air fuel ratio (A/F) sensor 1

Density of oxygen in exhaust gas (Mixture ratio feedback signal)

Fuel tank temperature sensor

Fuel temperature in fuel tank

Vehicle speed sensor

Vehicle speed*2

*1: The ECM determines the start signal status by the signal of engine speed and battery voltage. *2: This signal is sent to the ECM through CAN communication line.

This system controls flow rate of fuel vapor from the EVAP canister. The opening of the vapor by-pass passage in the EVAP canister purge volume control solenoid valve changes to control the flow rate. The EVAP canister purge volume control solenoid valve repeats ON/OFF operation according to the signal sent from the ECM. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor from the EVAP canister is regulated as the air flow changes.

COMPONENT DESCRIPTION
The EVAP canister purge volume control solenoid valve uses a ON/ OFF duty to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge volume control solenoid valve is moved by ON/OFF pulses from the ECM. The longer the ON pulse, the greater the amount of fuel vapor that will flow through the valve.

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

CONDITION

PURG VOL C/V

G Engine: After warming up

Idle

G Shift lever: P or N (A/T), Neutral (Accelerator pedal: Not depressed 0%

(M/T)

even slightly, after engine starting)

G Air conditioner switch: OFF G No-load

2,000 rpm

SEF337U UBS00JW1
SPECIFICATION
--

Revision: December 2006

EC-952

2006 Sentra

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QR25DE]

On Board Diagnosis Logic

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

UBS00JW2
A

P0444 0444
P0445 0445

EVAP canister purge volume control solenoid valve circuit open
EVAP canister purge volume control solenoid valve circuit shorted

G Harness or connectors

An excessively low voltage signal is sent

(The solenoid valve circuit is open or shorted.)

EC

to ECM through the valve

G EVAP canister purge volume control

solenoid valve

G Harness or connectors

C

An excessively high voltage signal is sent (The solenoid valve circuit is shorted.)

to ECM through the valve

G EVAP canister purge volume control

solenoid valve

D

DTC Confirmation Procedure

UBS00JW3

NOTE:

E

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

Before performing the following procedure, confirm battery voltage is more than 11V at idle.

F

WITH CONSULT-II

1. Turn ignition switch ON.

G

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Start engine and let it idle for at least 13 seconds.

4. If 1st trip DTC is detected, go to EC-956, "Diagnostic Procedure"

H

.

I

WITH GST Follow the procedure "WITH CONSULT-II" above.

J
SEF058Y
K
L

M

Revision: December 2006

EC-953

2006 Sentra

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QR25DE]

Wiring Diagram

UBS00JW4

Revision: December 2006

EC-954

BBWA1418E
2006 Sentra

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)
C
BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

D

G Idle speed

G Accelerator pedal: Not depressed even

slightly, after engine starting

E

45 GY/L

EVAP canister purge volume control solenoid valve

PBIB0050E

Approximately 10V

F

[Engine is running]

G Engine speed: About 2,000 rpm (More

G

than 100 seconds after starting engine)

111 W/G

ECM relay (Self shut-off)

PBIB0520E

H

[Engine is running]

[Ignition switch: OFF]

0 - 1.0V G For a few seconds after turning ignition

I

switch OFF

[Ignition switch: OFF]

G More than a few seconds after turning

BATTERY VOLTAGE (11 - 14V)

J

ignition switch OFF

119 120

R/G

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE

(11 - 14V)

K

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

L

M

Revision: December 2006

EC-955

2006 Sentra

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QR25DE]

Diagnostic Procedure

UBS00JW5

1. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE POWER SUPPLY CIR-

CUIT

1. Turn ignition switch OFF. 2. Disconnect EVAP canister purge volume control solenoid valve
harness connector.
3. Turn ignition switch ON.

4. Check voltage between EVAP canister purge volume control solenoid valve terminal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 3. NG >> GO TO 2.

BBIA0115E

2. DETECT MALFUNCTIONING PART

SEF206W

Check the following. G Harness for open or short between EVAP canister purge volume control solenoid valve and ECM G Harness for open or short between EVAP canister purge volume control solenoid valve and ECM relay.

>> Repair open circuit or short to ground or short to power in harness or connectors.
3. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OUTPUT SIGNAL CIR-
CUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 45 and EVAP canister purge volume control solenoid
valve terminal 2. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK (With CONSULT-II)>>GO TO 4. OK (Without CONSULT-II)>>GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-956

2006 Sentra

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QR25DE]

4. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION A

With CONSULT-II

1. Reconnect all harness connectors disconnected.

EC

2. Start engine.

3. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode with

CONSULT-II. Check that engine speed varies according to the valve opening.

C

OK or NG

OK >> GO TO 6. NG >> GO TO 5.

D

5. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to EC-957, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> Replace EVAP canister purge volume control solenoid valve.
6. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE With CONSULT-II
Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions.

Condition (PURG VOL CONT/V value)
100%
0%

Air passage continuity between A and B
Yes
No

E
PBIB1786E
F

G H

I

UBS00JW6

J

K

L

M

Without CONSULT-II
Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions.

Condition
12V direct current supply between terminals 1 and 2 No supply

Air passage continuity between A and B
Yes
No

Revision: December 2006

EC-957

PBIB0149E
PBIB0150E
2006 Sentra

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
[QR25DE]

Removal and Installation
EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to EM-108, "INTAKE MANIFOLD" .

UBS00JW7

Revision: December 2006

EC-958

2006 Sentra

DTC P0447 EVAP CANISTER VENT CONTROL VALVE
DTC P0447 EVAP CANISTER VENT CONTROL VALVE
Component Description
The EVAP canister vent control valve is located on the EVAP canister and is used to seal the canister vent. This solenoid valve responds to signals from the ECM. When the ECM sends an ON signal, the coil in the solenoid valve is energized. A plunger will then move to seal the canister vent. The ability to seal the vent is necessary for the on board diagnosis of other evaporative emission control system components. This solenoid valve is used only for diagnosis, and usually remains opened. When the vent is closed, under normal purge conditions, the evaporative emission control system is depressurized and allows EVAP Control System diagnoses.

[QR25DE]
PFP:14935
A
UBS00JW8
EC
C
D
PBIB1263E
E

F

G

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

CONDITION

VENT CONT/V

G Ignition switch: ON

On Board Diagnosis Logic

DTC No. Trouble diagnosis name

DTC detecting condition

P0447 0447

EVAP canister vent con- An improper voltage signal is sent to ECM trol valve circuit open through EVAP canister vent control valve.

H
BBIA0292E

UBS00JW9

I

SPECIFICATION

J

OFF

UBS00JWA
K

Possible cause

G Harness or connectors

(The valve circuit is open or shorted.)

L

G EVAP canister vent control valve

M

Revision: December 2006

EC-959

2006 Sentra

DTC P0447 EVAP CANISTER VENT CONTROL VALVE
[QR25DE]

DTC Confirmation Procedure

UBS00JWB

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm battery voltage is more than 11V at idle.

WITH CONSULT-II

1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and wait at least 8 seconds. 4. If 1st trip DTC is detected, go to EC-962, "Diagnostic Procedure"
.

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-960

2006 Sentra

DTC P0447 EVAP CANISTER VENT CONTROL VALVE Wiring Diagram

[QR25DE]
UBS00JWC
A

EC

C

D

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-961

BBWA2266E
2006 Sentra

DTC P0447 EVAP CANISTER VENT CONTROL VALVE
[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

111 W/G

117 L/Y

119 120

R/G

ECM relay (Self shut-off)
EVAP canister vent control valve Power supply for ECM

[Engine is running] [Ignition switch: OFF] G For a few seconds after turning ignition
switch OFF [Ignition switch: OFF] G More than a few seconds after turning
ignition switch OFF
[Ignition switch: ON]
[Ignition switch: ON]

0 - 1.0V
BATTERY VOLTAGE (11 - 14V)
BATTERY VOLTAGE (11 - 14V) BATTERY VOLTAGE (11 - 14V)

Diagnostic Procedure
1. INSPECTION START

UBS00JWD

1. Do you have CONSULT-II? Yes or No
Yes >> GO TO 2. No >> GO TO 3.
2. CHECK EVAP CANISTER VENT CONTROL VALVE CIRCUIT

With CONSULT-II 1. Turn ignition switch OFF and then turn ON. 2. Select "VENT CONTROL/V" in "ACTIVE TEST" mode with CONSULT-II. 3. Touch "ON/OFF" on CONSULT-II screen. 4. Check for operating sound of the valve.
Clicking noise should be heard. OK or NG
OK >> GO TO 7. NG >> GO TO 3.

PBIB1787E

Revision: December 2006

EC-962

2006 Sentra

DTC P0447 EVAP CANISTER VENT CONTROL VALVE
3. CHECK EVAP CANISTER VENT CONTROL VALVE POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect EVAP canister vent control valve harness connector.

[QR25DE]
A EC

C

D

3. Turn ignition switch ON. 4. Check voltage between EVAP canister vent control valve termi-
nal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 5. NG >> GO TO 4.

E
BBIA0292E
F G H

4. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors F27, M59 G Harness connectors B1, M14 G Harness for open or short between EVAP canister vent control valve and ECM relay

PBIB0080E

I

J

K

>> Repair open circuit or short to ground or short to power in harness or connectors. L
5. CHECK EVAP CANISTER VENT CONTROL VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND
SHORT M
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 117 and EVAP canister vent control valve terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 7. NG >> GO TO 6.

Revision: December 2006

EC-963

2006 Sentra

DTC P0447 EVAP CANISTER VENT CONTROL VALVE
6. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors B3, M16 G Harness connectors M59, F27 G Harness for open or short between EVAP canister vent control valve and ECM

[QR25DE]

>> Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK RUBBER TUBE FOR CLOGGING
1. Disconnect rubber tube connected to EVAP canister vent control valve. 2. Check the rubber tube for clogging. OK or NG
OK >> GO TO 8. NG >> Clean the rubber tube using an air blower.
8. CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to EC-964, "Component Inspection" . OK or NG
OK >> GO TO 9. NG >> Replace EVAP canister vent control valve.
9. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
EVAP CANISTER VENT CONTROL VALVE With CONSULT-II
1. Remove EVAP canister vent control valve from EVAP canister.
2. Check portion B of EVAP canister vent control valve for being rusted. If NG, replace EVAP canister vent control valve. If OK, go to next step.
3. Reconnect harness connectors disconnected.
4. Turn ignition switch ON.

UBS00JWE

PBIB1033E

Revision: December 2006

EC-964

2006 Sentra

DTC P0447 EVAP CANISTER VENT CONTROL VALVE
5. Perform "VENT CONTROL/V" in "ACTIVE TEST" mode. 6. Check air passage continuity and operation delay time.
Make sure new O-ring is installed properly.

[QR25DE]
A

Condition VENT CONTROL/V

Air passage continuity between A and B

EC

ON

No

OFF

Yes

Operation takes less than 1 second.

C

If NG, replace EVAP canister vent control valve.

If OK, go to next step.

PBIB1787E

7. Clean the air passage (Portion A to B ) of EVAP canister vent control valve using an air blower.

D

8. Perform step 6 again.

Without CONSULT-II

E

1. Remove EVAP canister vent control valve from EVAP canister.

2. Check portion B of EVAP canister vent control valve for being

rusted.

F

G

H

3. Check air passage continuity and operation delay time under the following conditions. Make sure new O-ring is installed properly.

PBIB1033E
I
J

Condition

Air passage continuity between A and B

12V direct current supply between terminals 1 and 2

No

K

OFF

Yes

Operation takes less than 1 second.
If NG, replace EVAP canister vent control valve. If OK, go to next step.

L
PBIB1034E

4. Clean the air passage (Portion A to B ) of EVAP canister vent control valve using an air blower.

M

5. Perform step 3 again.

Revision: December 2006

EC-965

2006 Sentra

DTC P0448 EVAP CANISTER VENT CONTROL VALVE
DTC P0448 EVAP CANISTER VENT CONTROL VALVE
Component Description
The EVAP canister vent control valve is located on the EVAP canister and is used to seal the canister vent. This solenoid valve responds to signals from the ECM. When the ECM sends an ON signal, the coil in the solenoid valve is energized. A plunger will then move to seal the canister vent. The ability to seal the vent is necessary for the on board diagnosis of other evaporative emission control system components. This solenoid valve is used only for diagnosis, and usually remains opened. When the vent is closed, under normal purge conditions, the evaporative emission control system is depressurized and allows "EVAP Control System" diagnoses.

[QR25DE]
PFP:16935
UBS00JYB
PBIB1263E

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

CONDITION

VENT CONT/V

G Ignition switch: ON

On Board Diagnosis Logic

DTC No. Trouble diagnosis name

DTC detecting condition

P0448 0448

EVAP canister vent con- EVAP canister vent control valve remains

trol valve close

closed under specified driving conditions.

BBIA0292E
UBS00JYC
SPECIFICATION OFF
UBS00JYD
Possible cause G EVAP canister vent control valve G EVAP control system pressure sensor
and the circuit G Blocked rubber tube to EVAP canister
vent control valve G EVAP canister is saturated with water

Revision: December 2006

EC-966

2006 Sentra

DTC P0448 EVAP CANISTER VENT CONTROL VALVE
[QR25DE]

DTC Confirmation Procedure

UBS00JYE

NOTE:

A

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

EC
WITH CONSULT-II

1. Turn ignition switch ON and wait at least 5 seconds.

2. Turn ignition switch OFF and wait at least 10 seconds.

C

3. Turn ignition switch ON and select "DATA MONITOR" mode with

CONSULT-II.

4. Start engine and let it idle for at least 1 minute.

D

5. Repeat next procedures 3 times.

a. Increase the engine speed up to 3,000 to 3,500 rpm and keep it

for 2 minutes and 50 seconds to 3 minutes.

E

Never exceed 3 minutes.

b. Fully released accelerator pedal and keep engine idle for about 5 seconds.
6. If 1st trip DTC is detected, go to EC-969, "Diagnostic Procedure" . If 1st trip DTC is not detected, go to the next step.
7. Repeat next procedure 20 times.

F
SEF058Y
G

a. Quickly increase the engine speed up to 4,000 to 4,500 rpm or more and keep it for 25 to 30 seconds.

b. Fully released accelerator pedal and keep engine idle for at least 35 seconds.

H

I

J

8. If 1st trip DTC is detected, go to EC-969, "Diagnostic Procedure" . WITH GST
Follow the procedure "WITH CONSULT-II" above.

K
PBIB0972E
L
M

Revision: December 2006

EC-967

2006 Sentra

DTC P0448 EVAP CANISTER VENT CONTROL VALVE Wiring Diagram

[QR25DE]
UBS00JYF

Revision: December 2006

EC-968

BBWA2266E
2006 Sentra

DTC P0448 EVAP CANISTER VENT CONTROL VALVE
[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

[Engine is running]

C

[Ignition switch: OFF] 0 - 1.0V
G For a few seconds after turning ignition

111 W/G

ECM relay (Self shut-off)

switch OFF

D

[Ignition switch: OFF] G More than a few seconds after turning

BATTERY VOLTAGE (11 - 14V)

ignition switch OFF
E

117 L/Y

EVAP canister vent control valve

[Ignition switch: ON]

BATTERY VOLTAGE (11 - 14V)

119 120

R/G

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE (11 - 14V)

F

Diagnostic Procedure
1. CHECK RUBBER TUBE

UBS00JYG
G

1. Turn ignition switch OFF.

2. Disconnect rubber tube connected to EVAP canister vent control valve.

H

3. Check the rubber tube for clogging.

I

J

OK or NG OK >> GO TO 2. NG >> Clean rubber tube using an air blower.
2. CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to EC-971, "Component Inspection" . OK or NG
OK >> GO TO 3. NG >> Replace EVAP canister vent control valve.

K
BBIA0292E
L
M

Revision: December 2006

EC-969

2006 Sentra

DTC P0448 EVAP CANISTER VENT CONTROL VALVE
3. CHECK IF EVAP CANISTER SATURATED WITH WATER
1. Remove EVAP canister with EVAP canister vent control valve attached. 2. Check if water will drain from the EVAP canister. Yes or No
Yes >> GO TO 4. No >> GO TO 6.

[QR25DE]

4. CHECK EVAP CANISTER

PBIB1213E

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor attached. The weight should be less than 1.9 kg (4.2 lb).
OK or NG
OK >> GO TO 6. NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART

Check the following. G EVAP canister for damage G EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

>> Repair hose or replace EVAP canister.
6. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.

2. Check connectors for water. Water should not exist.
OK or NG OK >> GO TO 7. NG >> Replace EVAP control system pressure sensor.

Revision: December 2006

EC-970

BBIA0292E
2006 Sentra

DTC P0448 EVAP CANISTER VENT CONTROL VALVE
7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-975, "Component Inspection" . OK or NG
OK >> GO TO 8. NG >> Replace EVAP control system pressure sensor.
8. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Component Inspection
EVAP CANISTER VENT CONTROL VALVE With CONSULT-II
1. Remove EVAP canister vent control valve from EVAP canister. 2. Check portion B of EVAP canister vent control valve for being
rusted. If NG, replace EVAP canister vent control valve. If OK, go to next step. 3. Reconnect harness connectors disconnected. 4. Turn ignition switch ON.

[QR25DE]
A EC
C D
UBS00JYH
E F G H

5. Perform "VENT CONTROL/V" in "ACTIVE TEST" mode. 6. Check air passage continuity and operation delay time.

Condition VENT CONTROL/V ON OFF

Air passage continuity between A and B No Yes

Operation takes less than 1 second. Make sure new O-ring is installed properly. If NG, replace EVAP canister vent control valve. If OK, go to next step.
7. Clean the air passage (Portion A to B ) of EVAP canister vent control valve using an air blower.
8. Perform step 5 again.
Without CONSULT-II 1. Remove EVAP canister vent control valve from EVAP canister.
2. Check portion B of EVAP canister vent control valve for being rusted.

I
PBIB1033E
J

K

L

PBIB1787E

M

Revision: December 2006

EC-971

PBIB1033E
2006 Sentra

DTC P0448 EVAP CANISTER VENT CONTROL VALVE
[QR25DE]

3. Check air passage continuity and operation delay time under the following conditions.

Condition
12V direct current supply between terminals 1 and 2
OFF

Air passage continuity between A and B No Yes

Operation takes less than 1 second. Make sure new O-ring is installed properly. If NG, replace EVAP canister vent control valve. If OK, go to next step.

PBIB1034E

4. Clean the air passage (Portion A to B ) of EVAP canister vent control valve using an air blower.

5. Perform step 3 again.

Revision: December 2006

EC-972

2006 Sentra

DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]

DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR Component Description

PFP:22365
A
UBS00JFB

The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the

ECM increases as pressure increases.

EC

C

D

E
BBIA0292E
F

G

H

PBIB1207E

I

CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.

UBS00JFC
J

MONITOR ITEM

CONDITION

SPECIFICATION

EVAP SYS PRES G Ignition switch: ON
On Board Diagnosis Logic

Approx. 1.8 - 4.8V

K
UBS00JFD

NOTE: If DTC P0451 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to L EC-1033, "DTC P0643 SENSOR POWER SUPPLY" .

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

M

P0451 0451

EVAP control system pressure sensor performance

ECM detects a sloshing signal from the EVAP control system pressure sensor

G Harness or connectors G EVAP control system pressure sensor

Revision: December 2006

EC-973

2006 Sentra

DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]

DTC Confirmation Procedure

UBS00JFE

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II 1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.
3. Start engine and wait at least 40 seconds.
NOTE: Do not depress accelerator pedal even slightly. If 1st trip DTC is detected, go to EC-974, "Diagnostic Procedure" .

SEF194Y

WITH GST Follow the procedure "WITH CONSULT-II" above.
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to EC-742, "Ground Inspection" .

UBS00JFF

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

BBIA0515E

Revision: December 2006

EC-974

2006 Sentra

DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]
2. CHECK EVPA CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER A 1. Disconnect EVAP control system pressure sensor harness connector.
EC

C

D

2. Check sensor harness connector for water.
Water should not exist.
OK or NG OK >> GO TO 3. NG >> Repair or replace harness connector.
3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-975, "Component Inspection" . OK or NG
OK >> GO TO 4. NG >> Replace EVAP control system pressure sensor.
4. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . For wiring diagram, refer to EC-978 .

BBIA0292E
E F G H I J

>> INSPECTION END

K

Component Inspection

UBS00JFG

EVAP CONTROL SYSTEM PRESSURE SENSOR

1. Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister. L

Do not reuse the O-ring, replace it with a new one.

2. Install a vacuum pump to EVAP control system pressure sensor.

3. Turn ignition switch ON and check output voltage between ECM

M

terminal 32 and ground under the following conditions.

Applied vacuum kPa (mmHg, inHg)
Not applied
-26.7 (-200, -7.87)

Voltage V 1.8 - 4.8 2.1 to 2.5V lower than above value

CAUTION: G Always calibrate the vacuum pump gauge when using it.
G Do not apply below -93.3 kPa (-700 mmHg, -27.56 inHg) or pressure over 101.3 kPa (760 mmHg, 29.92 inHg).
4. If NG, replace EVAP control system pressure sensor.

PBIB1200E

Revision: December 2006

EC-975

2006 Sentra

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR

PFP:25085

Component Description

UBS00JFH

The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the ECM increases as pressure increases.

BBIA0292E

PBIB1207E

CONSULT-II Reference Value in Data Monitor Mode

UBS00JFI

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

EVAP SYS PRES G Ignition switch: ON

Approx. 1.8 - 4.8V

On Board Diagnosis Logic

UBS00JFJ

NOTE: If DTC P0452 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to EC-1033, "DTC P0643 SENSOR POWER SUPPLY" .

DTC No.
P0452 0452

Trouble diagnosis name

DTC detecting condition

EVAP control system pressure sensor low input

An excessively low voltage from the sensor is sent to ECM.

Possible cause
G Harness or connectors (The sensor circuit is open or shorted.)
G EVAP control system pressure sensor

Revision: December 2006

EC-976

2006 Sentra

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]

DTC Confirmation Procedure

UBS00JFK

NOTE:

A

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

EC

Always perform test at a temperature of 5°C (41°F) or more.

WITH CONSULT-II
C 1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Turn ignition switch ON.

D

4. Select "DATA MONITOR" mode with CONSULT-II.

5. Make sure that "FUEL T/TMP SE" is more than 0°C (32°F).

6. Start engine and wait at least 20 seconds.

E

If 1st trip DTC is detected, go to EC-979, "Diagnostic Procedure"

.

F
SEF194Y

WITH GST

1. Start engine and warm it up to normal operating temperature.

G

2. Check that voltage between ECM terminal 107 (Fuel tank tem-

perature sensor signal) and ground is less than 4.2V.

3. Turn ignition switch OFF and wait at least 10 seconds.

H

4. Start engine and wait at least 20 seconds.

5. Select Service $07 with GST.

If 1st trip DTC is detected, go to EC-979, "Diagnostic Procedure"

I

.

J
PBIB1199E

K

L

M

Revision: December 2006

EC-977

2006 Sentra

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]

Wiring Diagram

UBS00JFL

Revision: December 2006

EC-978

BBWA1469E
2006 Sentra

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

32 L

EVAP control system pressure sensor

[Ignition switch: ON]

Approximately 1.8 - 4.8V

C

48 R/W

Sensor power supply (EVAP control system pressure sensor)

[Ignition switch: ON]

Approximately 5V

D

Sensor ground

(MAF sensor, IAT sensor,

ECT sensor, EVAP control [Engine is running]

E

67 B/W

system pressure sensor,

G Warm-up condition

Approximately 0V

PSP sensor, ASCD steering G Idle speed

switch, Refrigerant pressure

sensor)

F

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS0 0NO R
G

1. Turn ignition switch OFF.

2. Loosen and retighten engine two screws on the body.

H

Refer to EC-742, "Ground Inspection" .

I

J

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

K
BBIA0515E
L
M

Revision: December 2006

EC-979

2006 Sentra

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]
2. CHECK CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.

2. Check sensor harness connector for water.
Water should not exist.
OK or NG OK >> GO TO 3. NG >> Repair or replace harness connector.
3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch ON. 2. Check voltage between EVAP control system pressure sensor
terminal 3 and ground with CONSULT-II or tester.
Voltage: Approximately 5V OK or NG
OK >> GO TO 5. NG >> GO TO 4.

BBIA0292E

4. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors B1, M14 G Harness connectors M59, F27 G Harness for open or short between EVAP control system pressure sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB0138E

Revision: December 2006

EC-980

2006 Sentra

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]

5. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND

SHORT

A

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

EC

3. Disconnect TCM harness connector (A/T models).

4. Check harness continuity between EVAP control system pressure sensor terminal 1 and ECM terminal

67, TCM terminal 42 (A/T models).

C

Refer to Wiring Diagram.

Continuity should exist. D
5. Also check harness for short to ground and short to power.

OK or NG

OK >> GO TO 7.

E

NG >> GO TO 6.

6. DETECT MALFUNCTIONING PART F

Check the following.

G Harness connectors M58, F26

G Harness connectors B1, M14

G

G Harness for open or short between EVAP control system pressure sensor and ECM

G Harness for open or short between EVAP control system pressure sensor and TCM (A/T models)

H

>> Repair open circuit or short to ground or short to power in harness or connectors.

7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND I
SHORT

1. Check harness continuity between ECM terminal 32 and EVAP control system pressure sensor terminal J 2. Refer to Wiring Diagram.

Continuity should exist.

K

2. Also check harness for short to ground and short to power.

OK or NG

L

OK >> GO TO 9.

NG >> GO TO 8.

8. DETECT MALFUNCTIONING PART

M

Check the following. G Harness connectors M58, F26 G Harness connectors B1, M14 G Harness for open or short between ECM and EVAP control system pressure sensor

>> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to EC-982, "Component Inspection" . OK or NG
OK >> GO TO 10. NG >> Replace EVAP control system pressure sensor.

Revision: December 2006

EC-981

2006 Sentra

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]
10. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Component Inspection
EVAP CONTROL SYSTEM PRESSURE SENSOR

UBS00NOS

1. Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister. Do not reuse the O-ring, replace it with a new one.

2. Install a vacuum pump to EVAP control system pressure sensor.

3. Turn ignition switch ON and check output voltage between ECM terminal 32 and ground under the following conditions.

Applied vacuum kPa (mmHg, inHg)
Not applied
-26.7 (-200, -7.87)

Voltage V 1.8 - 4.8 2.1 to 2.5V lower than above value

CAUTION: G Always calibrate the vacuum pump gauge when using it.
G Do not apply below -93.3 kPa (-700 mmHg, -27.56 inHg) or pressure over 101.3 kPa (760 mmHg, 29.92 inHg).
4. If NG, replace EVAP control system pressure sensor.

PBIB1200E

Revision: December 2006

EC-982

2006 Sentra

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR Component Description

PFP:25085
A
UBS00JFO

The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the

ECM increases as pressure increases.

EC

C

D

E
BBIA0292E
F

G

H

PBIB1207E

I

CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.

UBS00JFP
J

MONITOR ITEM

CONDITION

SPECIFICATION

EVAP SYS PRES G Ignition switch: ON
On Board Diagnosis Logic

Approx. 1.8 - 4.8V

K
UBS00JFQ

NOTE: If DTC P0453 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to L EC-1033, "DTC P0643 SENSOR POWER SUPPLY" .

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

M

G Harness or connectors

(The sensor circuit is open or shorted.)

P0453 0453

EVAP control system pressure sensor high input

An excessively high voltage from the sensor is sent to ECM.

G EVAP control system pressure sensor G EVAP canister vent control valve G EVAP canister

G Rubber hose to EVAP canister vent control valve

Revision: December 2006

EC-983

2006 Sentra

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]

DTC Confirmation Procedure

UBS00JFR

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Always perform test at a temperature of 5°C (41°F) or more.

WITH CONSULT-II

1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON. 4. Select "DATA MONITOR" mode with CONSULT-II. 5. Make sure that "FUEL T/TMP SE" is more than 0°C (32°F). 6. Wait at least 10 seconds.
If 1st trip DTC is detected, go to EC-986, "Diagnostic Procedure" .

WITH GST
1. Start engine and warm it up to normal operating temperature. 2. Check that voltage between ECM terminal 107 (Fuel tank tem-
perature sensor signal) and ground is less than 4.2V.
3. Turn ignition switch OFF and wait at least 10 seconds. 4. Wait at least 10 seconds.
5. Select Service $07 with GST. If 1st trip DTC is detected, go to EC-986, "Diagnostic Procedure" .

SEF194Y

PBIB1199E

Revision: December 2006

EC-984

2006 Sentra

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]

Wiring Diagram

UBS00JFS
A

EC

C

D

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-985

BBWA1469E
2006 Sentra

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

32 L

EVAP control system pressure sensor

[Ignition switch: ON]

Approximately 1.8 - 4.8V

48 R/W

Sensor power supply (EVAP control system pressure sensor)

[Ignition switch: ON]

Approximately 5V

67 B/W

Sensor ground (MAF sensor, IAT sensor, ECT sensor, EVAP control system pressure sensor, PSP sensor, ASCD steering switch, Refrigerant pressure sensor)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS00JFT

1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body. Refer to EC-742, "Ground Inspection" .

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

BBIA0515E

Revision: December 2006

EC-986

2006 Sentra

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]
2. CHECK CONNECTOR A 1. Disconnect EVAP control system pressure sensor harness connector.
EC

C

D

2. Check sensor harness connector for water.

BBIA0292E
E

Water should not exist.

OK or NG

F

OK >> GO TO 3. NG >> Repair or replace harness connector.

3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT

G

1. Turn ignition switch ON.

2. Check voltage between EVAP control system pressure sensor

H

terminal 3 and ground with CONSULT-II or tester.

Voltage: Approximately 5V

I

OK or NG

OK >> GO TO 5.

NG >> GO TO 4.

J

4. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors B1, M14 G Harness connectors M59, F27 G Harness for open or short between EVAP control system pressure sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.

K
PBIB0138E
L
M

Revision: December 2006

EC-987

2006 Sentra

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]
5. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND
SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Disconnect TCM harness connectors (A/T models). 4. Check harness continuity between EVAP control system pressure sensor terminal 1 and ECM terminal
67, TCM terminal 42 (A/T models). Refer to Wiring Diagram.
Continuity should exist.
5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 7. NG >> GO TO 6.
6. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M58, F26 G Harness connectors B1, M14 G Harness for open or short between EVAP control system pressure sensor and ECM G Harness for open or short between EVAP control system pressure sensor and TCM (A/T models)

>> Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND
SHORT
1. Check harness continuity between ECM terminal 32 and EVAP control system pressure sensor terminal 2. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 9. NG >> GO TO 8.
8. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M58, F26 G Harness connectors B1, M14 G Harness for open or short between ECM and EVAP control system pressure sensor

>> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK RUBBER TUBE
1. Disconnect rubber tube connected to EVAP canister vent control valve. 2. Check the rubber tube for clogging, vent and kinked. OK or NG
OK >> GO TO 10. NG >> Clean the rubber tube using an air blower, repair or replace rubber tube.

Revision: December 2006

EC-988

2006 Sentra

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]

10. CHECK EVAP CANISTER VENT CONTROL VALVE A

Refer to EC-629, "Component Inspection" .

OK or NG

OK >> GO TO 11.

EC

NG >> Replace EVAP canister vent control valve.

11. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

C

Refer to EC-990, "Component Inspection" .

OK or NG

D

OK >> GO TO 12.

NG >> Replace EVAP control system pressure sensor.

12. CHECK IF EVAP CANISTER SATURATED WITH WATER

E

1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor

attached.

F

2. Check if water will drain from the EVAP canister.

Yes or No

Yes >> GO TO 13.

G

No >> GO TO 15.

H

I

PBIB1213E

13. CHECK EVAP CANISTER

J

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor

attached.

The weight should be less than 1.9 kg (4.2 lb).

K

OK or NG

OK >> GO TO 15.

NG >> GO TO 14.

L

14. DETECT MALFUNCTIONING PART

Check the following.

M

G EVAP canister for damage

G EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

>> Repair hose or replace EVAP canister.
15. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-989

2006 Sentra

DTC P0453 EVAP CONTROL SYSTEM PRESSURE SENSOR
[QR25DE]

Component Inspection
EVAP CONTROL SYSTEM PRESSURE SENSOR

UBS00JFU

1. Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister. Do not reuse the O-ring, replace it with a new one.

2. Install a vacuum pump to EVAP control system pressure sensor.

3. Turn ignition switch ON and check output voltage between ECM terminal 32 and ground under the following conditions.

Applied vacuum kPa (mmHg, inHg)
Not applied
-26.7 (-200, -7.87)

Voltage V 1.8 - 4.8 2.1 to 2.5V lower than above value

CAUTION: G Always calibrate the vacuum pump gauge when using it.
G Do not apply below -93.3 kPa (-700 mmHg, -27.56 inHg) or pressure over 101.3 kPa (760 mmHg, 29.92 inHg).
4. If NG, replace EVAP control system pressure sensor.

PBIB1200E

Revision: December 2006

EC-990

2006 Sentra

DTC P0455 EVAP CONTROL SYSTEM

[QR25DE]

DTC P0455 EVAP CONTROL SYSTEM On Board Diagnosis Logic

PFP:14950
A
UBS00JWF

This diagnosis detects a very large leak (fuel filler cap fell off etc.) in EVAP system between the fuel tank and

EVAP canister purge volume control solenoid valve.

EC

C

D

E

F

G

PBIB2359E

H

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0455 0455

EVAP control system gross leak detected

G Fuel filler cap remains open or fails to

I

close.

G Incorrect fuel tank vacuum relief valve

G Incorrect fuel filler cap used

J

G Foreign matter caught in fuel filler cap.

G Leak is in line between intake manifold

and EVAP canister purge volume control

solenoid valve.

K

G Foreign matter caught in EVAP canister vent control valve.

G EVAP canister or fuel tank leaks

L

EVAP control system has a very large leak

G EVAP purge line (pipe and rubber tube)

such as fuel filler cap fell off, EVAP control sys- leaks

tem does not operate properly.

G EVAP purge line rubber tube bent.

M

G Loose or disconnected rubber tube

G EVAP canister vent control valve and the circuit

G EVAP canister purge volume control solenoid valve and the circuit

G Fuel tank temperature sensor

G O-ring of EVAP canister vent control valve is missing or damaged.

G EVAP control system pressure sensor

G Refueling control valve

G ORVR system leaks

CAUTION: G Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used,
the MIL may come on.

G If the fuel filler cap is not tightened properly, the MIL may come on. G Use only a genuine NISSAN rubber tube as a replacement.

Revision: December 2006

EC-991

2006 Sentra

DTC P0455 EVAP CONTROL SYSTEM

[QR25DE]

DTC Confirmation Procedure

UBS00JWG

CAUTION: Never remove fuel filler cap during the DTC Confirmation Procedure.
NOTE: G Make sure that EVAP hose are connected to EVAP canister purge volume control solenoid valve
properly.
G If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
TESTING CONDITION:
G Perform "DTC WORK SUPPORT" when the fuel level is between 1/4 and 3/4 full, and vehicle is placed on flat level surface.
G Open engine hood before conducting the following procedure.

WITH CONSULT-II

1. Tighten fuel filler cap securely until reteaching sound is heard.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.
5. Make sure that the following conditions are met. COOLAN TEMP/S: 0 - 70°C (32 - 158°F) INT/A TEMP SE: 0 - 60°C (32 - 140°F)

SEF475Y
6. Select "EVAP SML LEAK P0442/P1442" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT-II. Follow the instruction displayed.

PBIB0829E
NOTE: If the engine speed cannot be maintained within the range displayed on the CONSULT-II screen, go to EC-664, "Basic Inspection" .
7. Make sure that "OK" is displayed.

Revision: December 2006

EC-992

2006 Sentra

DTC P0455 EVAP CONTROL SYSTEM
If "NG" is displayed, select "SELF-DIAG RESULTS" mode with CONSULT-II and make sure that "EVAP GROSS LEAK [P0455]" is displayed. If it is displayed, refer to EC-993, "Diagnostic Procedure" . If P0442 is displayed, perform Diagnostic Procedure for DTC P0442, EC-938 .

[QR25DE]
A EC

WITH GST
NOTE: Be sure to read the explanation of EC-651, "Driving Pattern" before driving vehicle. 1. Start engine. 2. Drive vehicle according to EC-651, "Driving Pattern" . 3. Stop vehicle. 4. Turn ignition switch OFF, wait at least 10 seconds and then turn ignition switch ON. 5. Select Service $07 with GST. G If P0455 is displayed on the screen, go to EC-993, "Diagnostic Procedure" . G If P0442 is displayed on the screen, go to Diagnostic Procedure, for DTC P0442, EC-938 . G If P0441 is displayed on the screen, go to Diagnostic Procedure for DTC P0441, EC-931 .
Diagnostic Procedure
1. CHECK FUEL FILLER CAP DESIGN
1. Turn ignition switch OFF. 2. Check for genuine NISSAN fuel filler cap design. OK or NG
OK >> GO TO 2. NG >> Replace with genuine NISSAN fuel filler cap.

C
SEC763C
D
E
F
G
H
UBS00JWH
I
J
K

2. CHECK FUEL FILLER CAP INSTALLATION
Check that the cap is tightened properly by rotating the cap clockwise. OK or NG
OK >> GO TO 3. NG >> 1. Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.
2. Retighten until reteaching sound is heard.
3. CHECK FUEL FILLER CAP FUNCTION
Check for air releasing sound while opening the fuel filler cap. OK or NG
OK >> GO TO 5. NG >> GO TO 4.

L
SEF915U
M

Revision: December 2006

EC-993

2006 Sentra

DTC P0455 EVAP CONTROL SYSTEM
4. CHECK FUEL TANK VACUUM RELIEF VALVE

[QR25DE]

Refer to EC-629, "FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FULLER CAP)" OK or NG
OK >> GO TO 5. NG >> Replace fuel filler cap with a genuine one.
5. CHECK EVAP PURGE LINE

Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks, improper connection or disconnection. Refer to EC-626, "EVAPORATIVE EMISSION SYSTEM" .
OK or NG
OK >> GO TO 6. NG >> Repair or reconnect the hose.
6. CLEAN EVAP PURGE LINE

Clean EVAP purge line (pipe and rubber tube) using air blower.

>> GO TO 7.
7. CHECK EVAP CANISTER VENT CONTROL VALVE
Check the following. G EVAP canister vent control is installed properly.
Refer to EC-630, "Removal and Installation" G EVAP canister vent control valve.
Refer to EC-964, "Component Inspection" OK or NG
OK >> GO TO 8. NG >> Repair or replace EVAP canister vent control valve and O-ring.

Revision: December 2006

EC-994

2006 Sentra

DTC P0455 EVAP CONTROL SYSTEM
8. INSTALL THE PRESSURE PUMP
To locate the EVAP leak, install EVAP service port adapter and pressure pump to EVAP service port securely. NOTE: Improper installation of the EVAP service port adapter to the EVAP service port may cause leaking.

With CONSULT-II>>GO TO 9. Without CONSULT-II>>GO TO 10.
9. CHECK FOR EVAP LEAK
With CONSULT-II 1. Turn ignition switch ON. 2. Select "EVAP SYSTEM CLOSE" of "WORK SUPPORT" mode
with CONSULT-II. 3. Touch "START" and apply pressure into the EVAP line until the
pressure indicator reaches the middle of the bar graph. CAUTION: G Never use compressed air or a high pressure pump. G Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pres-
sure in the system.
4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. Refer to EC-627, "EVAPORATIVE EMISSION LINE DRAWING" .
OK or NG OK >> GO TO 11. NG >> Repair or replace.

Revision: December 2006

EC-995

[QR25DE]
A

EC

C

D
BBIA0114E
E

F

G

SEF916U

H

I

J

K

L

M
PEF917U

SEF200U
2006 Sentra

DTC P0455 EVAP CONTROL SYSTEM
10. CHECK FOR EVAP LEAK

[QR25DE]

Without CONSULT-II 1. Turn ignition switch OFF. 2. Apply 12 volts DC to EVAP canister vent control valve. The valve will close. (Continue to apply 12 volts
until the end of test.)

BBIA0292E
3. Pressurize the EVAP line using pressure pump with 1.3 to 2.7 kPa (10 to 20 mmHg, 0.39 to 0.79 inHg), then remove pump and EVAP service port adapter. CAUTION: G Never use compressed air or a high pressure pump. G Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pressure in the system.
4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. Refer to EC-627, "EVAPORATIVE EMISSION LINE DRAWING" .
OK or NG OK >> GO TO 12. NG >> Repair or replace.

11. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

SEF200U

With CONSULT-II 1. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.
2. Start engine. 3. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode. 4. Touch "Qu" on CONSULT-II screen to increase "PURG VOL
CONT/V" opening to 100%.
5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.
OK or NG
OK >> GO TO 14. NG >> GO TO 13.

PBIB1786E

Revision: December 2006

EC-996

2006 Sentra

DTC P0455 EVAP CONTROL SYSTEM

[QR25DE]

12. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION A

Without CONSULT-II

1. Start engine and warm it up to normal operating temperature.

EC

2. Stop engine.

3. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.

4. Start engine and let it idle for at least 80 seconds.

C

5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

OK or NG

OK >> GO TO 15.

D

NG >> GO TO 13.

13. CHECK VACUUM HOSE

E

Check vacuum hoses for clogging or disconnection. Refer to EC-695, "Vacuum Hose Drawing" .

OK or NG

OK (With CONSULT-II)>>GO TO 14.

F

OK (Without CONSULT-II)>>GO TO 15.

NG >> Repair or reconnect the hose.

14. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

G

With CONSULT-II

H

1. Start engine.

2. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode with

CONSULT-II. Check that engine speed varies according to the

I

valve opening.

OK or NG

OK >> GO TO 16.

J

NG >> GO TO 15.

K

15. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to EC-957, "Component Inspection" . OK or NG
OK >> GO TO 16. NG >> Replace EVAP canister purge volume control solenoid valve.
16. CHECK FUEL TANK TEMPERATURE SENSOR

Refer to EC-886, "Component Inspection" . OK or NG
OK >> GO TO 17. NG >> Replace fuel level sensor unit.
17. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to EC-975, "Component Inspection" . OK or NG
OK >> GO TO 18. NG >> Replace EVAP control system pressure sensor.

Revision: December 2006

EC-997

PBIB1786E
L M
2006 Sentra

DTC P0455 EVAP CONTROL SYSTEM
18. CHECK EVAP/ORVR LINE

[QR25DE]

Check refueling EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper connection. For location, refer to EC-633, "ON BOARD REFUELING VAPOR RECOVERY (ORVR)" . OK or NG
OK >> GO TO 19. >> Repair or replace hoses and tubes.
19. CHECK SIGNAL LINE AND RECIRCULATION LINE

Check signal line and recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, looseness and improper connection. OK or NG
OK >> GO TO 20. >> Repair or replace hoses, tubes or filler neck tube.
20. CHECK REFUELING CONTROL VALVE

Refer to EC-636, "Component Inspection" . OK or NG
OK >> GO TO 21. >> Replace refueling EVAP control valve.
21. CHECK INTERMITTENT INCIDENT

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-998

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM

[QR25DE]

DTC P0456 EVAP CONTROL SYSTEM On Board Diagnosis Logic

PFP:14950
A
UBS00JWI

This diagnosis detects very small leaks in the EVAP line between fuel tank and EVAP canister purge volume

control solenoid valve, using the intake manifold vacuum in the same way as conventional EVAP small leak EC

diagnosis.

If ECM judges a leak which corresponds to a very small leak, the very small leak P0456 will be detected.

If ECM judges a leak equivalent to a small leak, EVAP small leak P0442 will be detected.

If ECM judges there are no leaks, the diagnosis will be OK.

C

D

E

F

G

H

PBIB2359E

I

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

G Incorrect fuel tank vacuum relief valve

J

G Incorrect fuel filler cap used

G Fuel filler cap remains open or fails to close.

G Foreign matter caught in fuel filler cap.

K

G Leak is in line between intake manifold and EVAP

canister purge volume control solenoid valve.

G Foreign matter caught in EVAP canister vent con-

L

trol valve.

G EVAP canister or fuel tank leaks

G EVAP purge line (pipe and rubber tube) leaks

M

P0456 0456

Evaporative emission control system very small leak (negative pressure check)

G EVAP system has a very small leak.
G EVAP system does not operate properly.

G EVAP purge line rubber tube bent G Loose or disconnected rubber tube G EVAP canister vent control valve and the circuit G EVAP canister purge volume control solenoid
valve and the circuit

G Fuel tank temperature sensor

G O-ring of EVAP canister vent control valve is missing or damaged

G EVAP canister is saturated with water

G EVAP control system pressure sensor

G Refueling control valve

G ORVR system leaks

G Fuel level sensor and the circuit

G Foreign matter caught in EVAP canister purge volume control solenoid valve

Revision: December 2006

EC-999

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM

[QR25DE]

CAUTION: G Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used,
the MIL may come on.
G If the fuel filler cap is not tightened properly, the MIL may come on.
G Use only a genuine NISSAN rubber tube as a replacement.

DTC Confirmation Procedure

UBS00JWJ

NOTE: G If DTC P0456 is displayed with P0442, first perform trouble diagnosis for DTC P0456. G After repair, make sure that the hoses and clips are installed properly. G If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait
at least 10 seconds before conducting the next test. TESTING CONDITION: G Open engine hood before conducting following procedure. G If any of following conditions are met just before the DTC confirmation procedure, leave the vehi-
cle for more than 1 hour. ­ Fuel filler cap is removed. ­ Refilled or drained the fuel. ­ EVAP component parts is/are removed. G Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

WITH CONSULT-II

1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.

2. Make sure the following conditions are met. FUEL LEVEL SE: 0.25 - 1.4V COOLAN TEMP/S: 0 - 32°C (32 - 90°F) FUEL T/TMP SE: 0 - 35°C (32 - 95°F) INT A/TEMP SE: More than 0°C (32°F) If NG, turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle) or refilling/draining fuel until the output voltage condition of the "FUEL LEVEL SE" meets within the range above and leave the vehicle for more than 1 hour. Then start from step 1).

PBIB1953E

3. Turn ignition switch OFF and wait at least 10 seconds.

4. Turn ignition switch ON.

5. Select "EVAP V/S LEAK P0456" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT-II. Follow the instruction displayed.

PBIB0837E
6. Make sure that "OK" is displayed. If "NG" is displayed, refer to EC-1002, "Diagnostic Procedure" . NOTE: G If the engine speed cannot be maintained within the range displayed on CONSULT-II screen, go to EC-664, "Basic Inspection" .

Revision: December 2006

EC-1000

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM

[QR25DE]

G Make sure that EVAP hoses are connected to EVAP canister purge volume control solenoid

valve properly.

A

Overall Function Check

UBS00JWK

WITH GST Use this procedure to check the overall function of the EVAP very small leak function. During this check, a 1st EC

trip DTC might not be confirmed.

CAUTION:

G Never use compressed air, doing so may damage the EVAP system.

C

G Do not start engine.

G Do not exceeded 4.12 kPa (0.042 kg/cm2 , 0.6 psi).

D

1. Attach the EVAP service port adapter securely to the EVAP ser-

vice port.

E

F

G
BBIA0114E

2. Set the pressure pump and a hose.

H

3. Also set the pressure pump with pressure gauge to the EVAP

service port adapter.

4. Turn ignition switch ON.

I

5. Connect GST and select Service $08.

6. Using Service $08 control the EVAP canister vent control valve

(close).

J

7. Apply pressure and make sure the following conditions are sat-

isfied.

Pressure to be applied: 2.7 kPa (20 mmHg, 0.79 inHg) Time to be waited after the pressure drawn in to the EVAP

SEF462UI

K

system and the pressure to be dropped: 60 seconds and the pressure should not be dropped

more than 0.4 kPa (3 mmHg, 0.12 inHg).

If NG, go to EC-1002, "Diagnostic Procedure" .

L

If OK, go to next step.

8. Disconnect GST.

9. Start engine and warm it up to normal operating temperature.

M

10. Turn ignition switch OFF and wait at least 10 seconds.

11. Restart engine and let it idle for 90 seconds.

12. Keep engine speed at 2,000 rpm for 30 seconds.

13. Turn ignition switch OFF.

NOTE: For more information, refer to GST Instruction Manual.

Revision: December 2006

EC-1001

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM
Diagnostic Procedure
1. CHECK FUEL FILLER CAP DESIGN
1. Turn ignition switch OFF. 2. Check for genuine NISSAN fuel filler cap design. OK or NG
OK >> GO TO 2. NG >> Replace with genuine NISSAN fuel filler cap.

[QR25DE]
UBS00JWL

2. CHECK FUEL FILLER CAP INSTALLATION
Check that the cap is tightened properly by rotating the cap clockwise. OK or NG
OK >> GO TO 3. NG >> 1. Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.
2. Retighten until reteaching sound is heard.
3. CHECK FUEL FILLER CAP FUNCTION
Check for air releasing sound while opening the fuel filler cap. OK or NG
OK >> GO TO 5. NG >> GO TO 4.
4. CHECK FUEL TANK VACUUM RELIEF VALVE
Refer to EC-629, "FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FULLER CAP)" . OK or NG
OK >> GO TO 5. NG >> Replace fuel filler cap with a genuine one.

SEF915U

Revision: December 2006

EC-1002

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM
5. INSTALL THE PRESSURE PUMP
To locate the EVAP leak, install EVAP service port adapter and pressure pump to EVAP service port securely.

[QR25DE]
A EC

C

D
BBIA0114E
E

F

G

H
SEF916U
NOTE: Improper installation of the EVAP service port adapter to the EVAP service port may cause leaking.
I
With CONSULT-II>>GO TO 6. Without CONSULT-II>>GO TO 7.
J

K

L

M

Revision: December 2006

EC-1003

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM
6. CHECK FOR EVAP LEAK
With CONSULT-II 1. Turn ignition switch ON. 2. Select "EVAP SYSTEM CLOSE" of "WORK SUPPORT" mode with CONSULT-II. 3. Touch "START" and apply pressure into the EVAP line until the
pressure indicator reaches the middle of the bar graph. CAUTION: G Never use compressed air or a high pressure pump. G Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pres-
sure in the system.
4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. Refer to EC-627, "EVAPORATIVE EMISSION LINE DRAWING" .
OK or NG OK >> GO TO 8. NG >> Repair or replace.

[QR25DE]
PEF917U SEF200U

Revision: December 2006

EC-1004

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM

[QR25DE]

7. CHECK FOR EVAP LEAK A

Without CONSULT-II
1. Turn ignition switch OFF. 2. Apply 12 volts DC to EVAP canister vent control valve. The valve will close. (Continue to apply 12 volts EC
until the end of test.)

C

D

E

BBIA0292E
3. Pressurize the EVAP line using pressure pump with 1.3 to 2.7 kPa (10 to 20 mmHg, 0.39 to 0.79 inHg), F
then remove pump and EVAP service port adapter.

CAUTION:

G Never use compressed air or a high pressure pump.

G

G Do not exceed 4.12 kPa (0.042 kg/cm2 , 0.6 psi) of pressure in the system.

H 4. Using EVAP leak detector, locate the EVAP leak. For the leak

detector, refer to the instruction manual for more details. Refer

to EC-627, "EVAPORATIVE EMISSION LINE DRAWING" .

OK or NG

I

OK >> GO TO 8. NG >> Repair or replace.
J

8. CHECK EVAP CANISTER VENT CONTROL VALVE
Check the following. G EVAP canister vent control valve is installed properly.
Refer to EC-630, "Removal and Installation" G EVAP canister vent control valve.
Refer to EC-964, "Component Inspection" OK or NG
OK >> GO TO 9. NG >> Repair or replace EVAP canister vent control valve and O-ring.

K
SEF200U
L
M

Revision: December 2006

EC-1005

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM
9. CHECK IF EVAP CANISTER SATURATED WITH WATER

[QR25DE]

1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
2. Does water drain from the EVAP canister?
Yes or No
Yes >> GO TO 10. No (With CONSULT-II)>>GO TO 12. No (Without CONSULT-II)>>GO TO 13.

10. CHECK EVAP CANISTER

PBIB1213E

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor attached. The weight should be less than 1.9 kg (4.2 lb).
OK or NG
OK (With CONSULT-II)>>GO TO 12. OK (Without CONSULT-II)>>GO TO 13. NG >> GO TO 11.
11. DETECT MALFUNCTIONING PART

Check the following. G EVAP canister for damage G EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

>> Repair hose or replace EVAP canister.
12. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
With CONSULT-II 1. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port. 2. Start engine. 3. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode. 4. Touch "Qu" on CONSULT-II screen to increase "PURG VOL
CONT/V" opening to 100%. 5. Check vacuum hose for vacuum when revving engine up to
2,000 rpm. OK or NG
OK >> GO TO 15. NG >> GO TO 14.

PBIB1786E

Revision: December 2006

EC-1006

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM

[QR25DE]

13. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION A

Without CONSULT-II

1. Start engine and warm it up to normal operating temperature.

2. Stop engine.

EC

3. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.

4. Start engine and let it idle for at least 80 seconds.

C

5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

OK or NG

OK >> GO TO 16.

D

NG >> GO TO 14.

14. CHECK VACUUM HOSE E

Check vacuum hoses for clogging or disconnection. Refer to EC-695, "Vacuum Hose Drawing" .

OK or NG

OK >> GO TO 15.

F

NG >> Repair or reconnect the hose.

15. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

G

Refer to EC-957, "Component Inspection" .

OK or NG

H

OK >> GO TO 16.

NG >> Replace EVAP canister purge volume control solenoid valve.

16. CHECK FUEL TANK TEMPERATURE SENSOR

I

Refer to EC-886, "Component Inspection" .

OK or NG

J

OK >> GO TO 17. NG >> Replace fuel level sensor unit.

17. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

K

Refer to EC-975, "Component Inspection" .

OK or NG

L

OK >> GO TO 18. NG >> Replace EVAP control system pressure sensor.
M
18. CHECK EVAP PURGE LINE

Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection. Refer to EC-627, "EVAPORATIVE EMISSION LINE DRAWING" . OK or NG
OK >> GO TO 19. NG >> Repair or reconnect the hose.
19. CLEAN EVAP PURGE LINE

Clean EVAP purge line (pipe and rubber tube) using air blower.

>> GO TO 20.

Revision: December 2006

EC-1007

2006 Sentra

DTC P0456 EVAP CONTROL SYSTEM
20. CHECK EVAP/ORVR LINE

[QR25DE]

Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper connection. For location, refer to EC-633, "ON BOARD REFUELING VAPOR RECOVERY (ORVR)" . OK or NG
OK >> GO TO 21. NG >> Repair or replace hoses and tubes.
21. CHECK SIGNAL LINE AND RECIRCULATION LINE

Check signal line recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, looseness and improper connection. OK or NG
OK >> GO TO 22. NG >> Repair or replace hose, tube or filler neck tube.
22. CHECK REFUELING CONTROL VALVE

Refer to EC-636, "Component Inspection" . OK or NG
OK >> GO TO 23. NG >> Replace refueling control valve with fuel tank.
23. CHECK FUEL LEVEL SENSOR

Refer to FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" . OK or NG
OK >> GO TO 24. NG >> Replace fuel level sensor unit.
24. CHECK INTERMITTENT INCIDENT

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-1008

2006 Sentra

DTC P0460 FUEL LEVEL SENSOR
DTC P0460 FUEL LEVEL SENSOR
Component Description
The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combination meter. sends the fuel level sensor signal to the ECM through CAN communication line. It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float.

[QR25DE]
PFP:25060
A
UBS00JWM
EC
C
D

On Board Diagnostic Logic

PBIB1218E
E
UBS00JWN

NOTE:

G

If DTC P0460 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC U1000, U1001. Refer to EC-743, "DTC U1000, U1001 CAN COMMUNICATION LINE" .

F

G If DTC P0460 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to EC-746, "DTC U1010 CAN COMMUNICATION" . G
When the vehicle is parked, naturally the fuel level in the fuel tank is stable. It means that output signal of the fuel level sensor does not change. If ECM senses sloshing signal from the sensor, fuel level sensor malfunction is detected.
H

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0460 0460

G Harness or connectors

(The CAN communication line is open or

I

Fuel level sensor circuit noise

Even though the vehicle is parked, a signal being varied is sent from the fuel level sensor to ECM.

shorted)
G Harness or connectors (The sensor circuit is open or shorted)

J

G Combination meter.

G Fuel level sensor

DTC Confirmation Procedure

UBS00JWO

K

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

L

WITH CONSULT-II

1. Turn ignition switch ON.

M

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Start engine and wait maximum of 2 consecutive minutes.

4. If 1st trip DTC is detected, go to EC-1010, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

Revision: December 2006

EC-1009

SEF195Y
2006 Sentra

DTC P0460 FUEL LEVEL SENSOR
Diagnostic Procedure
1. CHECK FUEL GAUGE OPERATION

[QR25DE]
UBS00JWP

Refer to DI-16, "Meter/Gauge Operation and Odo/Trip Meter Segment Check in Diagnosis Mode" . OK or NG
OK >> GO TO 2. NG >> Follow the instruction of DI-16, "Meter/Gauge Operation and Odo/Trip Meter Segment Check in
Diagnosis Mode" .
2. CHECK FUEL LEVEL SENSOR AND CIRCUIT

Refer to DI-26, "FUEL LEVEL SENSOR UNIT CHECK" . OK or NG
OK >> GO TO 3. NG >> Repair or replace malfunctioning parts.
3. CHECK INTERMITTENT INCIDENT

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Removal and Installation
FUEL LEVEL SENSOR Refer to FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" .

UBS00JWQ

Revision: December 2006

EC-1010

2006 Sentra

DTC P0461 FUEL LEVEL SENSOR
DTC P0461 FUEL LEVEL SENSOR
Component Description
The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combination meter. sends the fuel level sensor signal to the ECM through CAN communication line. It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float.

[QR25DE]
PFP:25060
A
UBS00JWR
EC
C
D

On Board Diagnostic Logic

PBIB1218E
E
UBS00JWS

NOTE:

G

If DTC P0461 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC U1000, U1001. Refer to EC-743, "DTC U1000, U1001 CAN COMMUNICATION LINE" .

F

G If DTC U0461 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to EC-746, "DTC U1010 CAN COMMUNICATION" . G
Driving long distances naturally affect fuel gauge level. This diagnosis detects the fuel gauge malfunction of the gauge not moving even after a long distance has been driven.
H

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0461 0461

G Harness or connectors

(the CAN communication line is open or

I

The output signal of the fuel level sensor does shorted)

Fuel level sensor circuit not change within the specified range even

G Harness or connectors

range/performance

though the vehicle has been driven a long dis- (The sensor circuit is open or shorted)

tance.

J

G Combination meter.

G Fuel level sensor

Overall Function Check

UBS00JWT

K

Use this procedure to check the overall function of the fuel level sensor function. During this check, a 1st trip

DTC might not be confirmed.

WARNING:

L

When performing following procedure, be sure to observe the handling of the fuel. Refer to FL-7,

"FUEL TANK" .

TESTING CONDITION:

M

Before starting overall function check, preparation of draining fuel and refilling fuel is required.

WITH CONSULT-II

NOTE: Start from step 11, if it is possible to confirm that the fuel cannot be drained by 30 (7-7/8 US gal, 6-5/ 8 Imp gal) in advance.
1. Prepare a fuel container and a spare hose. 2. Release fuel pressure from fuel line, refer to EC-673, "FUEL PRESSURE RELEASE" .
3. Remove the fuel feed hose on the fuel level sensor unit. 4. Connect a spare fuel hose where the fuel feed hose was removed.

Revision: December 2006

EC-1011

2006 Sentra

DTC P0461 FUEL LEVEL SENSOR

[QR25DE]

5. Turn ignition switch OFF and wait at least 10 seconds then turn ON.
6. Select "FUEL LEVEL SE" in "DATA MONITOR" mode with CONSULT-II.
7. Check "FUEL LEVEL SE" output voltage and note it.
8. Select "FUEL PUMP" in "ACTIVE TEST" mode with CONSULTII.
9. Touch "ON" and drain fuel approximately 30 (7-7/8 US gal, 65/8 Imp gal) and stop it.
10. Check "FUEL LEVEL SE" output voltage and note it.
11. Fill fuel into the fuel tank for 30 (7-7/8 US gal, 6-5/8 Imp gal).
12. Check "FUEL LEVEL SE" output voltage and note it.
13. Confirm whether the voltage changes more than 0.03V during step 7 to 10 and 10 to 12. If NG, go to Diagnostic Procedure EC-1012 .

SEF195Y

WITH GST

NOTE: Start from step 8, if it is possible to confirm that the fuel cannot be drained by 30 (7-7/8 US gal, 6-5/8 Imp gal) in advance. 1. Prepare a fuel container and a spare hose. 2. Release fuel pressure from fuel line, refer to EC-673, "FUEL PRESSURE RELEASE" . 3. Remove the fuel feed hose on the fuel level sensor unit. 4. Connect a spare fuel hose where the fuel feed hose was removed. 5. Turn ignition switch ON. 6. Drain fuel by 30 (7-7/8 US gal, 6-5/8 Imp gal) from the fuel tank using proper equipment. 7. Confirm that the fuel gauge indication varies. 8. Fill fuel into the fuel tank for 30 (7-7/8 US gal, 6-5/8 Imp gal). 9. Confirm that the fuel gauge indication varies. 10. If NG, go to Diagnostic Procedure, EC-1012 .

Diagnostic Procedure
1. CHECK FUEL GAUGE OPERATION

UBS00JWU

Refer to DI-16, "Meter/Gauge Operation and Odo/Trip Meter Segment Check in Diagnosis Mode" . OK or NG
OK >> GO TO 2. NG >> Follow the instruction of DI-16, "Meter/Gauge Operation and Odo/Trip Meter Segment Check in
Diagnosis Mode" .
2. CHECK FUEL LEVEL SENSOR AND CIRCUIT

Refer to DI-26, "FUEL LEVEL SENSOR UNIT CHECK" . OK or NG
OK >> GO TO 3. NG >> Repair or replace malfunctioning parts.
3. CHECK INTERMITTENT INCIDENT

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Removal and Installation
FUEL LEVEL SENSOR Refer to FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" .

Revision: December 2006

EC-1012

UBS00JWV
2006 Sentra

DTC P0462, P0463 FUEL LEVEL SENSOR
DTC P0462, P0463 FUEL LEVEL SENSOR
Component Description
The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combination meter. sends the fuel level sensor signal to the ECM through CAN communication. It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float.

[QR25DE]
PFP:25060
A
UBS00JWW
EC
C
D

On Board Diagnostic Logic

PBIB1218E
E
UBS00JWX

NOTE:

G

If DTC P0462 or P0463 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC U1000, U1001. Refer to EC-743, "DTC U1000, U1001 CAN COMMUNICATION LINE" .

F

G If DTC P0462 or P0463 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to EC-746, "DTC U1010 CAN COMMUNICATION" . G

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0462 0462

Fuel level sensor circuit An excessively low voltage it from the sensor G Harness or connectors

low input

to ECM.

(The CAN communication line is open or H

shorted)

G Harness or connectors

P0463

Fuel level sensor circuit An excessively high voltage from the sensor to (The sensor circuit is open or shorted)

I

0463

high input

ECM.

G Combination meter.

G Fuel level sensor

DTC Confirmation Procedure

J
UBS00JWY

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

K

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 11V at ignition

switch ON.

L

WITH CONSULT-II

1. Turn ignition switch ON.

M

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Wait at least 5 seconds.

4. If 1st trip DTC is detected, go to EC-1014, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF195Y

Revision: December 2006

EC-1013

2006 Sentra

DTC P0462, P0463 FUEL LEVEL SENSOR
Diagnostic Procedure
1. CHECK FUEL GAUGE OPERATION

[QR25DE]
UBS00JWZ

Refer to DI-16, "Meter/Gauge Operation and Odo/Trip Meter Segment Check in Diagnosis Mode" . OK or NG
OK >> GO TO 2. NG >> Follow the instruction of DI-16, "Meter/Gauge Operation and Odo/Trip Meter Segment Check in
Diagnosis Mode" .
2. CHECK FUEL LEVEL SENSOR AND CIRCUIT

Refer to DI-26, "FUEL LEVEL SENSOR UNIT CHECK" . OK or NG
OK >> GO TO 3. NG >> Repair or replace malfunctioning parts.
3. CHECK INTERMITTENT INCIDENT

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Removal and Installation
FUEL LEVEL SENSOR Refer to FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" .

UBS00JX0

Revision: December 2006

EC-1014

2006 Sentra

DTC P0500 VSS

[QR25DE]

DTC P0500 VSS Component Description

PFP:32702
A
UBS00 JG H

NOTE: G If DTC P0500 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC EC
U1000, U1001. Refer to EC-743, "DTC U1000, U1001 CAN COMMUNICATION LINE" .

G If DTC P0500 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010.

Refer to EC-746, "DTC U1010 CAN COMMUNICATION" .

C

The vehicle speed sensor is installed in the transaxle. It contains a pulse generator which provides a vehicle

speed signal to the combination meter. The combination meter then sends a signal to the ECM through CAN

communication line. D

On Board Diagnosis Logic

UBS00JGI

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

E

G Harness or connectors

(The CAN communication line is open or

shorted)

P0500 0500

Vehicle speed sensor

The almost 0 km/h (0 MPH) signal from vehicle speed sensor is sent to ECM even when vehicle is being driven.

G Harness or connectors (The vehicle speed signal circuit is open or shorted)

F

G Vehicle speed sensor

G

G Combination meter

DTC Confirmation Procedure

UBS00JGJ

H

CAUTION: Always drive vehicle at a safe speed.

NOTE:

I

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION: Steps 1 and 2 may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a

J

road test is expected to be easier, it is unnecessary to lift the vehicle.

WITH CONSULT-II

K

1. Start engine.

2. Read "VHCL SPEED SE" in "DATA MONITOR" mode with CONSULT-II. The vehicle speed on CONSULT-

II should exceed 10 km/h (6 MPH) when rotating wheels with suitable gear position.

L

If NG, go to EC-1016, "Diagnostic Procedure" .

If OK, go to following step.

3. Select "DATA MONITOR" mode with CONSULT-II. M
4. Warm engine up to normal operating temperature.

5. Maintain the following conditions for at least 60 consecutive seconds.

ENG SPEED

1,200 - 6,000 rpm (A/T models) 1,800 - 6,000 rpm (M/T models)

COOLANT TEMP/S More than 70°C (158°F)

B/FUEL SCHDL

More then 6.0 msec (A/T models) More than 5.0 msec (M/T models)

Selector lever

Suitable position

PW/ST SIGNAL

OFF

6. If 1st trip DTC is detected, go to EC-1016, "Diagnostic Procedure" .

SEF196Y

Revision: December 2006

EC-1015

2006 Sentra

DTC P0500 VSS

[QR25DE]

Overall Function Check

UBS00JGK

Use this procedure to check the overall function of the vehicle speed signal circuit. During this check, a 1st trip DTC might not be confirmed.

WITH GST 1. Lift up drive wheels.
2. Start engine.
3. Read vehicle speed sensor signal in Service $01 with GST. The vehicle speed sensor on GST should be able to exceed 10 km/h (6 MPH) when rotating wheels with suitable gear position.
4. If NG, go to EC-1016, "Diagnostic Procedure" .

Diagnostic Procedure
1. CHECK VEHICLE SPEED SENSOR CITCUIT

UBS00JGL

Refer to DI-4, "METERS AND GAUGES" . OK or NG
OK >> GO TO 2. NG >> Repair or replace.
2. CHECK DTC WITH COMBINATION METER

Refer to DI-16, "Meter/Gauge Operation and Odo/Trip Meter Segment Check in Diagnosis Mode" .

>> INSPECTION END

Revision: December 2006

EC-1016

2006 Sentra

DTC P0506 ISC SYSTEM

[QR25DE]

DTC P0506 ISC SYSTEM Description

PFP:23781
A
UBS00JGM

NOTE:

If DTC P0506 is displayed with other DTC, first perform the trouble diagnosis for the other DTC dis- EC played.

The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is let

into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects C

the actual engine speed and sends a signal to the ECM.

The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value

memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily. D

The optimum value stored in the ECM is determined by taking into consideration various engine conditions,

such as during warming up, deceleration, and engine load (air conditioner, power steering and cooling fan

operation, etc.).

E

On Board Diagnosis Logic

UBS00 JG N

DTC No.
P0506 0506

Trouble diagnosis name

DTC detecting condition

Idle speed control system RPM lower than expected

The idle speed is less than the target idle speed by 100 rpm or more.

DTC Confirmation Procedure

Possible cause

F

G Electric throttle control actuator
G Intake air leak
G

UBS00JGO

NOTE: G If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait H
at least 10 seconds before conducting the next test.

G If the target idle speed is out of the specified value, perform EC-671, "Idle Air Volume Learning" , before conducting DTC Confirmation Procedure. For the target idle speed, refer to the EC-1212, I
"SERVICE DATA AND SPECIFICATIONS (SDS)" .

TESTING CONDITION: G Before performing the following procedure, confirm that battery voltage is more than 11V at idle. J
G Always perform the test at a temperature above -10°C (14°F).

WITH CONSULT-II

K

1. Open engine hood.

2. Start engine and warm it up to normal operating temperature.

3. Turn ignition switch OFF and wait at least 10 seconds.

L

4. Turn ignition switch ON again and select "DATA MONITOR" mode with CONSULT-II.

5. Start engine and run it for at least 1 minute at idle speed.

M

6. If 1st trip DTC is detected, go to EC-1018, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF174Y

Revision: December 2006

EC-1017

2006 Sentra

DTC P0506 ISC SYSTEM
Diagnostic Procedure
1. CHECK INTAKE AIR LEAK

[QR25DE]
UBS00JGP

1. Start engine and let it idle. 2. Listen for an intake air leak after the mass air flow sensor. OK or NG
OK >> GO TO 2. NG >> Discover air leak location and repair.
2. REPLACE ECM

1. Stop engine. 2. Replace ECM. 3. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to
EC-641, "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)" . 4. Perform EC-670, "VIN Registration" . 5. Perform EC-670, "Accelerator Pedal Released Position Learning" . 6. Perform EC-671, "Throttle Valve Closed Position Learning" . 7. Perform EC-671, "Idle Air Volume Learning" .

>> INSPECTION END

Revision: December 2006

EC-1018

2006 Sentra

DTC P0507 ISC SYSTEM

[QR25DE]

DTC P0507 ISC SYSTEM Description

PFP:23781
A
UBS00JGQ

NOTE:

If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for the other DTC dis- EC played.

The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is let

into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects C

the actual engine speed and sends a signal to the ECM.

The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value

memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily. D

The optimum value stored in the ECM is determined by taking into consideration various engine conditions,

such as during warming up, deceleration, and engine load (air conditioner, power steering and cooling fan

operation, etc.).

E

On Board Diagnosis Logic

UBS00 JG R

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

F

P0507 0507

Idle speed control system RPM higher than expected

The idle speed is more than the target idle speed by 200 rpm or more.

G Electric throttle control actuator G Intake air leak G PCV system

G

DTC Confirmation Procedure

UBS0 0JG S

NOTE:

H

G If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait

at least 10 seconds before conducting the next test.

G If the target idle speed is out of the specified value, perform EC-671, "Idle Air Volume Learning" , I before conducting "DTC Confirmation Procedure". For the target idle speed, refer to the EC-1212, "SERVICE DATA AND SPECIFICATIONS (SDS)" .

TESTING CONDITION:

J

G Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

G Always perform the test at a temperature above -10°C (14°F).

WITH CONSULT-II

K

1. Open engine hood.

2. Start engine and warm it up to normal operating temperature.

3. Turn ignition switch OFF and wait at least 10 seconds.

L

4. Turn ignition switch ON again and select "DATA MONITOR"

mode with CONSULT-II.

5. Start engine and run it for at least 1 minute at idle speed.

M

6. If 1st trip DTC is detected, go to EC-1020, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF174Y

Revision: December 2006

EC-1019

2006 Sentra

DTC P0507 ISC SYSTEM
Diagnostic Procedure
1. CHECK PCV HOSE CONNECTION

[QR25DE]
UBS00JGT

Confirm that PCV hose is connected correctly. OK or NG
OK >> GO TO 2. NG >> Repair or replace.
2. CHECK INTAKE AIR LEAK

1. Start engine and let it idle. 2. Listen for an intake air leak after the mass air flow sensor. OK or NG
OK >> GO TO 3. NG >> Discover air leak location and repair.
3. REPLACE ECM

1. Stop engine. 2. Replace ECM. 3. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to
EC-641, "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)" . 4. Perform EC-670, "VIN Registration" . 5. Perform EC-670, "Accelerator Pedal Released Position Learning" . 6. Perform EC-671, "Throttle Valve Closed Position Learning" . 7. Perform EC-671, "Idle Air Volume Learning" .

>> INSPECTION END

Revision: December 2006

EC-1020

2006 Sentra

DTC P0550 PSP SENSOR
DTC P0550 PSP SENSOR
Component Description
Power steering pressure (PSP) sensor is installed to the power steering high-pressure tube and detects a power steering load. This sensor is a potentiometer which transforms the power steering load into output voltage, and emits the voltage signal to the ECM. The ECM controls the electric throttle control actuator and adjusts the throttle valve opening angle to increase the engine speed and adjusts the idle speed for the increased load.

[QR25DE]
PFP:49763
A
UBS00 JG U
EC
C
D

CONSULT-II Reference Value in Data Monitor Mode

BBIA0164E
E
UBS0 0JG V

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

F

PW/ST SIGNAL

G Engine: After warming up, idle the engine

Steering wheel is in not being turned. (Forward direction)
Steering wheel is being turned.

OFF ON

G

On Board Diagnosis Logic

UBS00JGW

The MIL will not light up for this diagnosis.

H

NOTE:

If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to

EC-1033, "DTC P0643 SENSOR POWER SUPPLY" .

I

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0550

Power steering pressure An excessively low or high voltage from the

G Harness or connectors (The sensor circuit is open or shorted.)

J

0550

sensor circuit

sensor is sent to ECM.

G Power steering pressure sensor

DTC Confirmation Procedure

UBS0 0JG X

K

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

L

WITH CONSULT-II 1. Turn ignition switch ON.
M 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for at least 5 seconds. 4. If 1st trip DTC is detected, go to EC-1023, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

Revision: December 2006

EC-1021

2006 Sentra

Wiring Diagram

DTC P0550 PSP SENSOR

[QR25DE]
UBS00JGY

Revision: December 2006

EC-1022

BBWA2170E
2006 Sentra

DTC P0550 PSP SENSOR

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

[Engine is running]

0.5 - 4.0V

C

12 P

Power steering pressure sensor

G Steering wheel: Being turned [Engine is running]

G Steering wheel: Not being turned

0.4 - 0.8V

D

Sensor ground

(MAF sensor, IAT sensor,

ECT sensor, EVAP control [Engine is running]

E

67 B/W

system pressure sensor,

G Warm-up condition

Approximately 0V

PSP sensor, ASCD steering G Idle speed switch, Refrigerant pressure

sensor)

F

68 G/R

Sensor power supply (Power steering pressure sensor)

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

[Ignition switch: ON]

Approximately 5V

G
UBS00JGZ
H

1. Turn ignition switch OFF.

2. Loosen and retighten engine two screws on the body.

Refer to EC-742, "Ground Inspection" .

I

J

K

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

L
BBIA0515E
M

Revision: December 2006

EC-1023

2006 Sentra

DTC P0550 PSP SENSOR
2. CHECK POWER STEERING PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Disconnect power steering pressure (PSP) sensor harness connector.
2. Turn ignition switch ON.

[QR25DE]

3. Check voltage between power steering pressure sensor terminal 1 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

BBIA0164E

PBIB0188E
3. CHECK POWER STEERING PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Disconnect TCM harness connector (A/T models). 4. Check harness continuity between power steering pressure sensor terminal 3 and ECM terminal 67, TCM
terminal 42 (A/T models).
Continuity should exist. 5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 5. NG >> GO TO 4.
4. DETECT MALFUNCTIONING PART
Check the following. G Harness for open or short between power steering pressure sensor and ECM G Harness for open or short between power steering pressure sensor and TCM (A/T models)
>> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-1024

2006 Sentra

DTC P0550 PSP SENSOR

[QR25DE]

5. CHECK POWER STEERING PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT A
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 12 and power steering pressure sensor terminal 2. EC
Continuity should exist.

3. Also check harness for short to ground and short to power.

OK or NG

C

OK >> GO TO 6. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

6. CHECK POWER STEERING PRESSURE SENSOR

D

Refer to EC-1025, "Component Inspection" .

OK or NG

E

OK >> GO TO 7. NG >> Replace power steering pressure sensor.
F
7. CHECK INTERMITTENT INCIDENT

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

G

>> INSPECTION END
Component Inspection
POWER STEERING PRESSURE SENSOR 1. Reconnect all harness connectors disconnected. 2. Start engine and let it idle.
3. Check voltage between ECM terminal 12 and ground under the following conditions.

Condition Steering wheel: Being turned. Steering wheel: Not being turned.

Voltage 0.5 - 4.5V 0.4 - 0.8V

H
UBS00JH0
I
J
K

Removal and Installation
POWER STEERING PRESSURE SENSOR
Refer to PS-25, "HYDRAULIC LINE" .

L

MBIB0025E

UBS00KPE

M

Revision: December 2006

EC-1025

2006 Sentra

DTC P0603 ECM POWER SUPPLY
DTC P0603 ECM POWER SUPPLY Component Description
Battery voltage is supplied to the ECM even when the ignition switch is turned OFF for the ECM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the Idle Air Volume Learning value memory, etc.

[QR25DE]
PFP:23710
UBS00JHD

On Board Diagnosis Logic

PBIB1164E UBS00JHE

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0603 0603

ECM power supply circuit

ECM back-up RAM system does not function properly.

G Harness or connectors [ECM power supply (back-up) circuit is open or shorted.]
G ECM

DTC Confirmation Procedure

UBS00JHF

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II 1. Turn ignition switch ON and wait at least 1 second. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for 1 second.
4. Turn ignition switch OFF, wait at least 10 seconds, and then turn ON.
5. Repeat steps 3 and 4 for 4 times.
6. If 1st trip DTC is detected, go to EC-1028, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-1026

2006 Sentra

Wiring Diagram

DTC P0603 ECM POWER SUPPLY

[QR25DE]
UBS00JHG
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1027

BBWA1437E
2006 Sentra

DTC P0603 ECM POWER SUPPLY

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

121 W/L

Power supply for ECM (Back-up)

CONDITION [Ignition switch: OFF]

DATA (DC Voltage)
BATTERY VOLTAGE (11 - 14V)

Diagnostic Procedure
1. CHECK ECM POWER SUPPLY

UBS00JHH

1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check voltage between ECM terminal 121 and ground with
CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 3. NG >> GO TO 2.

2. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E10, F48 G 10A fuse G Fuse and fusible link box connector E24 G Harness for open or short between ECM and battery
>> Repair or replace harness or connectors.
3. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

MBIB0026E

Revision: December 2006

EC-1028

2006 Sentra

DTC P0603 ECM POWER SUPPLY
4. PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-II 1. Turn ignition switch ON. 2. Select "SELF DIAG RESULTS" mode with CONSULT-II. 3. Touch "ERASE". 4. Perform DTC Confirmation Procedure.
See EC-1026 . 5. Is the 1st trip DTC P0603 displayed again?
With GST 1. Turn ignition switch ON. 2. Select Service $04 with GST. 3. Perform "DTC Confirmation Procedure".
See EC-1026 . 4. Is the 1st trip DTC P0603 displayed again? Yes or No
Yes >> GO TO 5. No >> INSPECTION END
5. REPLACE ECM

[QR25DE]
A EC
C D E F G

1. Replace ECM. H
2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to BL-96, "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM -- NATS)" .

3. Perform EC-670, "VIN Registration" . I
4. Perform EC-670, "Accelerator Pedal Released Position Learning" .

5. Perform EC-671, "Throttle Valve Closed Position Learning" .

6. Perform EC-671, "Idle Air Volume Learning" .

J

>> INSPECTION END K

L

M

Revision: December 2006

EC-1029

2006 Sentra

DTC P0605 ECM
DTC P0605 ECM Component Description
The ECM consists of a microcomputer and connectors for signal input and output and for power supply. The ECM controls the engine.

[QR25DE]
PFP:23710
UBS00JH1

On Board Diagnosis Logic
This self-diagnosis has one or two trip detection logic.

DTC No.
P0605 0605

Trouble diagnosis name A)
Engine control module B) C)

DTC detecting condition ECM calculation function is malfunctioning. ECM EEP-ROM system is malfunctioning. ECM self shut-off function is malfunctioning.

PBIB1164E UBS00JH2
Possible cause G ECM

FAIL-SAFE MODE ECM enters fail-safe mode when malfunction A is detected.

Detected items

Engine operation condition in fail-safe mode

Malfunction A

G ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
G ECM deactivates ASCD operation.

DTC Confirmation Procedure

UBS00JH3

Perform PROCEDURE FOR MALFUNCTION A first. If the 1st trip DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B. If there is no malfunction on PROCEDURE FOR MALFUNCTION B, perform PROCEDURE FOR MALFUNCTION C.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

PROCEDURE FOR MALFUNCTION A With CONSULT-II
1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II.
3. If 1st trip DTC is detected, go to EC-1031, "Diagnostic Procedure" .

With GST Follow the procedure "With CONSULT-II" above.

Revision: December 2006

EC-1030

SEF058Y
2006 Sentra

DTC P0605 ECM
PROCEDURE FOR MALFUNCTION B With CONSULT-II
1. Turn ignition switch ON and wait at least 1 second. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Turn ignition switch OFF, wait at least 10 seconds, and then turn
ON. 4. If 1st trip DTC is detected, go to EC-1031, "Diagnostic Proce-
dure" .

With GST Follow the procedure "With CONSULT-II" above.
PROCEDURE FOR MALFUNCTION C With CONSULT-II
1. Turn ignition switch ON and wait at least 1 second. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Turn ignition switch OFF, wait at least 10 seconds, and then turn
ON. 4. Repeat step 3 for 32 times. 5. If 1st trip DTC is detected, go to EC-1031, "Diagnostic Proce-
dure" .

With GST Follow the procedure "With CONSULT-II" above.
Diagnostic Procedure
1. INSPECTION START
With CONSULT-II 1. Turn ignition switch ON. 2. Select "SELF DIAG RESULTS" mode with CONSULT-II. 3. Touch "ERASE". 4. Perform DTC Confirmation Procedure.
See EC-1030 . 5. Is the 1st trip DTC P0605 displayed again?
With GST 1. Turn ignition switch ON. 2. Select Service $04 with GST. 3. Perform DTC Confirmation Procedure.
See EC-1030 . 4. Is the 1st trip DTC P0605 displayed again? Yes or No
Yes >> GO TO 2. No >> INSPECTION END

Revision: December 2006

EC-1031

[QR25DE]
A EC
C D
SEF058Y
E F G H I J
SEF058Y
K
UBS00JH4
L M
2006 Sentra

2. REPLACE ECM

DTC P0605 ECM

[QR25DE]

1. Replace ECM. 2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to
EC-641, "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)" . 3. Perform EC-670, "VIN Registration" . 4. Perform EC-670, "Accelerator Pedal Released Position Learning" . 5. Perform EC-671, "Throttle Valve Closed Position Learning" . 6. Perform EC-671, "Idle Air Volume Learning" .

>> INSPECTION END

Revision: December 2006

EC-1032

2006 Sentra

DTC P0643 SENSOR POWER SUPPLY

[QR25DE]

DTC P0643 SENSOR POWER SUPPLY On Board Diagnosis Logic

PFP:18919
A
UBS00JJF

This self-diagnosis has the one trip detection logic.

DTC No. Trouble diagnosis name

DTC detecting condition

EC
Possible cause

G Harness or connectors

(APP sensor 1 circuit is shorted.)

(PSP sensor circuit is shorted.)

C

(Refrigerant pressure sensor circuit is

shorted.)

P0643 Sensor power supply circuit ECM detects a voltage of power source

(EVAP control system pressure sensor circuit is shorted.)

D

0643

short

for sensor is excessively low or high.

G Accelerator pedal position sensor

(APP sensor 1)

G Power steering pressure sensor

E

G Refrigerant pressure sensor

G EVAP control system pressure sensor
F

FAIL-SAFE MODE

When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up. G
Engine operation condition in fail-safe mode

ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return

spring.

H

DTC Confirmation Procedure

UBS00JJG

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

I

least 10 seconds before conducting the next test.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

J

WITH CONSULT-II

1. Turn ignition switch ON.

K

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Start engine and let it idle for 1 second.

4. If DTC is detected, go to EC-1036, "Diagnostic Procedure" .

L

M

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-1033

2006 Sentra

Wiring Diagram

DTC P0643 SENSOR POWER SUPPLY

[QR25DE]
UBS00JJH

Revision: December 2006

EC-1034

BBWA2160E
2006 Sentra

DTC P0643 SENSOR POWER SUPPLY

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

48 R/W

Sensor power supply (EVAP control system pressure sensor)

[Ignition switch: ON]

C
Approximately 5V

49 R/Y

Sensor power supply (Refrigerant pressure sensor)

[Ignition switch: ON]

Approximately 5V

D

68 G/R

Sensor power supply (Power steering pressure sensor)

[Ignition switch: ON]

Approximately 5V

E

Sensor ground

[Engine is running]

82 B/Y

(Accelerator pedal position G Warm-up condition

Approximately 0V

F

sensor 1)

G Idle speed

83 G

Sensor ground (Accelerator pedal position

[Engine is running] G Warm-up condition

Approximately 0V

G

sensor 2)

G Idle speed

90 R

Sensor power supply (Accelerator pedal position sensor 1)

[Ignition switch: ON]

Approximately 5V

H

Sensor power supply

91 R/Y

(Accelerator pedal position [Ignition switch: ON]

Approximately 5V

I

sensor 2)

[Ignition switch: ON]

G Engine stopped

0.28 - 0.48V

J

98 R/B

Accelerator pedal position sensor 2

G Accelerator pedal: Fully released [Ignition switch: ON]

G Engine stopped

More than 2.0V

K

G Accelerator pedal: Fully depressed

[Ignition switch: ON]

L

G Engine stopped

0.65 - 0.87V

106 W

Accelerator pedal position sensor 1

G Accelerator pedal: Fully released [Ignition switch: ON]

M

G Engine stopped

More than 4.3V

G Accelerator pedal: Fully depressed

Revision: December 2006

EC-1035

2006 Sentra

DTC P0643 SENSOR POWER SUPPLY
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF. 2. Loosen and retighten engine two screws on the body.
Refer to EC-742, "Ground Inspection" .

[QR25DE]
UBS00JJI

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT-I
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.

BBIA0515E

3. Check voltage between APP sensor terminal 2 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 7. NG >> GO TO 3.

BBIA0104E

3. CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT-II

1. Turn ignition switch OFF. 2. Disconnect ECM harness connector.
3. Check harness continuity between APP sensor terminal 2 and ECM terminal 90. Refer to Wiring Diagram.

Continuity should exist.

OK or NG
OK >> GO TO 5. NG >> GO TO 4.

Revision: December 2006

EC-1036

PBIB0811E
2006 Sentra

DTC P0643 SENSOR POWER SUPPLY
4. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open between ECM and accelerator pedal position sensor

[QR25DE]
A EC

>> Repair open circuit. C
5. CHECK SENSOR POWER SUPPLY CIRCUITS

Check harness for short to power and short to ground, between the following terminals.

D

ECM terminal

Sensor terminal

Reference Wiring Diagram

90

APP sensor terminal 2

EC-1119

E

48

EVAP control system pressure sensor terminal 3

EC-978

49

Refrigerant pressure sensor terminal 3

EC-1198

68

PSP sensor terminal 1

EC-1022

F

OK or NG

OK >> GO TO 6.

NG >> Repair short to ground or short to power in harness or connectors.

G

6. CHECK COMPONENTS

H Check the following.

G Refrigerant pressure sensor (Refer to EC-1197 .)

G Power steering pressure sensor (Refer to EC-1025 .)

I

G EVAP control system pressure sensor (Refer to EC-990 .)

OK or NG

OK >> GO TO 9.

J

NG >> Replace malfunctioning component.

7. CHECK APP SENSOR

K

Refer to EC-1124, "Component Inspection" .

OK or NG L
OK >> GO TO 9. NG >> GO TO 8.

8. REPLACE ACCELERATOR PEDAL ASSEMBLY

M

1. Replace accelerator pedal assembly. 2. Perform EC-670, "Accelerator Pedal Released Position Learning" . 3. Perform EC-671, "Throttle Valve Closed Position Learning" . 4. Perform EC-671, "Idle Air Volume Learning" .

>> INSPECTION END
9. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-1037

2006 Sentra

DTC P0850 PNP SWITCH

[QR25DE]

DTC P0850 PNP SWITCH

PFP:23006

Component Description

UBS00KKM

When the shift position is P or N (A/T), Neutral (M/T) park/neutral position (PNP) switch is ON. ECM detects the park/neutral position when continuity with ground exists.

CONSULT-II Reference Value in Data Monitor Mode

UBS00KKN

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

P/N POSI SW

G Ignition switch: ON

Shift lever: P or N (A/T), Neutral (M/ T)

ON

Shift lever: Except above position OFF

On Board Diagnosis Logic

UBS00KKO

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P0850 0850

Park/neutral position switch

The signal of the park/neutral position (PNP) switch is not changed in the process of engine starting and driving.

G Harness or connectors [The park/neutral position (PNP) switch circuit is open or shorted.]
G Park/neutral position (PNP) switch

DTC Confirmation Procedure

UBS00KKP

CAUTION: Always drive vehicle at a safe speed.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II
1. Turn ignition switch ON.
2. Select "P/N POSI SW" in "DATA MONITOR" mode with CONSULT-II. Then check the "P/N POSI SW" signal under the following conditions.

Position (Selector lever)
P or N position (A/T) Neutral position (M/T)
Except above position

Known-good signal ON OFF

If NG, go to EC-1041, "Diagnostic Procedure" . If OK, go to following step.
3. Select "DATA MONITOR" mode with CONSULT-II.
4. Start engine and warm it up to normal operating temperature.
5. Maintain the following conditions for at least 50 consecutive seconds.

SEF212Y

ENG SPEED

More than 1,500 rpm

COOLANT TEMP/S

More than 70°C (158°F)

B/FUEL SCHDL

3.0 - 31.8 msec (A/T models) 2.5 - 31.8 msec (M/T models)

VHCL SPEED SE

More than 64 km/h (40 MPH)

Shift lever

Suitable position

6. If 1st trip DTC is detected, go to EC-1041, "Diagnostic Procedure" .

SEF213Y

Revision: December 2006

EC-1038

2006 Sentra

DTC P0850 PNP SWITCH

[QR25DE]

Overall Function Check

UBS00KKQ

Use this procedure to check the overall function of the park/neutral position switch circuit. During this check, a A

1st trip DTC might not be confirmed.

WITH GST

EC

1. Turn ignition switch ON.

2. Check voltage between ECM terminal 102 (PNP switch signal)

and ground under the following conditions.

C

Condition (Gear position)

Voltage (Known-good data)

P or N position (A/T) Neutral position (M/T)

Approx. 0V

D

Except above position

Battery voltage

3. If NG, go to EC-1041, "Diagnostic Procedure" .

E

MBIB0029E
F

G

H

I

J

K

L

M

Revision: December 2006

EC-1039

2006 Sentra

Wiring Diagram

DTC P0850 PNP SWITCH

[QR25DE]
UBS00KKR

Revision: December 2006

EC-1040

BBWA0749E
2006 Sentra

DTC P0850 PNP SWITCH

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

102 G/OR PNP switch

[Ignition switch: ON]

Approximately 0V

C

G Shift lever: P or N (A/T), Neutral (M/T)

[Ignition switch: ON] G Except above gear position

BATTERY VOLTAGE

(11 - 14V)

D

Diagnostic Procedure
1. CHECK GROUND CIRCUIT

UBS00KKS
E

1. Turn ignition switch OFF.

2. Disconnect PNP switch harness connector.

F

3. Check harness continuity between PNP switch terminal 2 and ground.

Refer to Wiring Diagram.

Continuity should exist.

G

4. Also check harness for short to power.

OK or NG

H

OK >> GO TO 2.

NG >> Repair open circuit or short to power in harness or connectors.

2. CHECK INPUT SIGNAL CIRCUIT

I

1. Disconnect ECM harness connector.

2. Check harness continuity between ECM terminal 102 and PNP switch terminal 1.

J

Refer to Wiring Diagram.

Continuity should exist. K
3. Also check harness for short to ground and short to power.

OK or NG

OK >> GO TO 3.

L

NG >> Repair open circuit or short to ground or short to power in harness or connectors.

3. CHECK PNP SWITCH M Refer to AT-486, "DTC P0705 PARK/NEUTRAL POSITION SWITCH" (A/T models), MT-75, "POSITION SWITCH" (M/T models).
OK or NG
OK >> GO TO 4. NG >> Replace PNP switch.

4. CHECK INTERMITTENT INCIDENT

Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-1041

2006 Sentra

DTC P1148 CLOSED LOOP CONTROL
DTC P1148 CLOSED LOOP CONTROL On Board Diagnosis Logic
This self-diagnosis has the one trip detection logic.

[QR25DE]
PFP:22690
UBS00JXZ

DTC No.
P1148 1148

Trouble diagnosis name

DTC detecting condition

Closed loop control function

The closed loop control function for bank 1 does not operate even when vehicle is driving in the specified condition.

Possible cause
G The air fuel ratio (A/F) sensor 1 circuit is open or shorted.
G Air fuel ratio (A/F) sensor 1 G Air fuel ratio (A/F) sensor 1 heater

DTC P1148 is displayed with another DTC for air fuel ratio (A/F) sensor 1. Perform the trouble diagnosis for the corresponding DTC.

Revision: December 2006

EC-1042

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE

[QR25DE]

DTC P1217 ENGINE OVER TEMPERATURE
System Description
COOLING FAN CONTROL

PFP:00000
A
UBS00KJM

Sensor

Input Signal to ECM

ECM function

Actuator

EC

Camshaft position sensor (PHASE) Crankshaft position sensor (POS)

Engine speed*1

C

Battery

Battery voltage*1

Vehicle speed sensor Engine coolant temperature sensor

Vehicle speed*2 Engine coolant temperature

Cooling fan control

Cooling fan relay

D

Air conditioner switch

Air conditioner ON signal

Refrigerant pressure sensor

Refrigerant pressure

E

*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.

*2: This signal is sent to ECM through CAN communication line.

The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant F pressure, and air conditioner ON signal. The control system has 3-step control [HIGH/LOW/OFF].

OPERATION
G

H

I

J

K

L

M

PBIB2507E

Revision: December 2006

EC-1043

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE

[QR25DE]

CONSULT-II Reference Value in Data Monitor Mode

UBS00KJN

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

AIR COND SIG COOLING FAN

G Engine: After warming up, idle the engine
G Engine: After warming up, idle the engine
G Air conditioner switch: OFF

A/C switch: OFF
A/C switch: ON (Compressor operates)
Engine coolant temperature is 94°C (201°F) or less
Engine coolant temperature is between 95°C (203°F) and 99°C (210°F)
Engine coolant temperature is 100°C (212°F) or more

OFF ON OFF LOW HIGH

On Board Diagnosis Logic

UBS00KJO

If the cooling fan or another component in the cooling system malfunctions, engine coolant temperature will rise. When the engine coolant temperature reaches an abnormally high temperature condition, a malfunction is indicated. This self-diagnosis has the one trip detection logic.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P1217 1217

Engine over temperature (Overheat)

G Cooling fan does not operate properly (Overheat).
G Cooling fan system does not operate properly (Overheat).
G Engine coolant was not added to the system using the proper filling method.
G Engine coolant is not within the specified range.

G Harness or connectors (The cooling fan circuit is open or shorted.)
G Cooling fan G Cooling fan relays G Radiator hose G Radiator G Radiator cap G Water pump G Thermostat For more information, refer to EC-1054, "Main 12 Causes of Overheating" .

CAUTION: When a malfunction is indicated, be sure to replace the coolant. Refer to MA-23, "Changing Engine Coolant" . Also, replace the engine oil. Refer to MA-26, "Changing Engine Oil" .
1. Fill radiator with coolant up to specified level with a filling speed of 2 liters per minute. Be sure to use coolant with the proper mixture ratio. Refer to MA-14, "Anti-freeze Coolant Mixture Ratio" .
2. After refilling coolant, run engine to ensure that no water-flow noise is emitted.

Overall Function Check

UBS00KJP

Use this procedure to check the overall function of the cooling fan. During this check, a DTC might not be confirmed.
WARNING: Never remove the radiator cap when the engine is hot. Serious burns could be caused by high pressure fluid escaping from the radiator. Wrap a thick cloth around cap. Carefully remove the cap by turning it a quarter turn to allow built-up pressure to escape. Then turn the cap all the way off.

Revision: December 2006

EC-1044

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
WITH CONSULT-II 1. Check the coolant level in the reservoir tank and radiator.
NOTE: Allow engine to cool before checking coolant level. If the coolant level in the reservoir tank and/or radiator is below the proper range, skip the following steps and go to EC-1048, "Diagnostic Procedure" . 2. Confirm whether customer filled the coolant or not. If customer filled the coolant, skip the following steps and go to EC-1048, "Diagnostic Procedure" . 3. Turn ignition switch ON.
4. Perform "COOLING FAN" in "ACTIVE TEST" mode with CONSULT-II.
5. If the results are NG, go to EC-1048, "Diagnostic Procedure" .

[QR25DE]
A
EC
C
D
SEF621W
E
F

G

WITH GST
1. Check the coolant level in the reservoir tank and radiator.
NOTE: Allow engine to cool before checking coolant level. If the coolant level in the reservoir tank and/or radiator is below the proper range, skip the following steps and go to EC-1048, "Diagnostic Procedure" .

SEF646X

H

I

J

K

SEF621W
L

2. Confirm whether customer filled the coolant or not. If customer filled the coolant, skip the following steps

and go to EC-1048, "Diagnostic Procedure" .

3. Start engine.

M

CAUTION: Be careful not to overheat engine.

4. Set temperature control lever to full cold position.

5. Turn air conditioner switch ON.

6. Turn blower fan switch ON.

7. Run engine at idle for a few minutes with air conditioner operating.

CAUTION: Be careful not to overheat engine.

SEC163BA

8. Make sure that cooling fan operates at low speed. If NG, go to EC-1048, "Diagnostic Procedure" . If OK, go to the following step.

9. Turn ignition switch OFF.

10. Turn air conditioner switch and blower fan switch OFF.

11. Disconnect engine coolant temperature sensor harness connector.

Revision: December 2006

EC-1045

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
12. Connect 150 resistor to engine coolant temperature sensor harness connector. 13. Restart engine and make sure that cooling fan operates at
higher speed than low speed. CAUTION: Be careful not to overheat engine. 14. If NG, go to EC-1048, "Diagnostic Procedure" .

[QR25DE]

MEC475B

Revision: December 2006

EC-1046

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE Wiring Diagram

[QR25DE]
UBS00KJQ
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1047

BBWA1476E
2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

89 LG/B

Cooling fan relay (High)

97 LG/R Cooling fan relay (Low)

[Engine is running] G Cooling fan: Not operating [Engine is running] G Cooling fan: High speed operating [Ignition switch: ON] G Cooling fan: Not operating [Ignition switch: ON] G Cooling fan: Operating

BATTERY VOLTAGE (11 - 14V)
0 - 1.0V
BATTERY VOLTAGE (11 - 14V)
0 - 1.0V

Diagnostic Procedure
1. INSPECTION START

UBS00KJR

Do you have CONSULT-II? Yes or No
Yes >> GO TO 2. No >> GO TO 4.
2. CHECK COOLING FAN LOW SPEED OPERATION

With CONSULT-II
1. Turn ignition switch ON.
2. Perform "COOLING FAN" in "ACTIVE TEST" mode with CONSULT-II and touch "LOW" on the CONSULT-II screen.
3. Make sure that cooling fans-1 and -2 operate at low speed.
OK or NG
OK >> GO TO 3. NG >> Check cooling fan low speed control circuit. (Go to PRO-
CEDURE A, EC-1051 .)

3. CHECK COOLING FAN HIGH SPEED OPERATION
With CONSULT-II 1. Touch "HI" on the CONSULT-II screen. 2. Make sure that cooling fans-1 and -2 operates at high speed. OK or NG
OK >> GO TO 6. NG >> Check cooling fan high speed control circuit. (Go to
PROCEDURE B, EC-1053 .)

SEF784Z

Revision: December 2006

EC-1048

SEF785Z
2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
4. CHECK COOLING FAN LOW SPEED OPERATION
Without CONSULT-II 1. Turn ignition switch OFF. 2. Disconnect cooling fan relay-2 and relay-3. 3. Start engine and let it idle. 4. Set temperature lever at full cold position. 5. Turn air conditioner switch ON. 6. Turn blower fan switch ON.
7. Make sure that cooling fans-1 and -2 operate at low speed. OK or NG
OK >> GO TO 5. NG >> Check cooling fan low speed control circuit. (Go to PRO-
CEDURE A, EC-1051 .)
5. CHECK COOLING FAN HIGH SPEED OPERATION
Without CONSULT-II 1. Turn ignition switch OFF. 2. Reconnect cooling fan relay-2 and relay-3. 3. Turn air conditioner switch and blower fan switch OFF. 4. Disconnect engine coolant temperature sensor harness connector. 5. Connect 150 resistor to engine coolant temperature sensor harness connector. 6. Restart engine and make sure that cooling fans-1 and -2 oper-
ates at high speed. OK or NG
OK >> GO TO 6. NG >> Check cooling fan high speed control circuit. (Go to
PROCEDURE B, EC-1053 .)

[QR25DE]
A

EC

C

D

E
BBIA0113E
F

G

H

SEC163BA

I

J

K

L

M

MEC475B

Revision: December 2006

EC-1049

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
6. CHECK COOLING SYSTEM FOR LEAK
Apply pressure to the cooling system with a tester, and check if the pressure drops. Testing pressure: 157 kPa (1.6 kg/cm2 , 23 psi)
CAUTION: Higher than the specified pressure may cause radiator damage. Pressure should not drop. OK or NG
OK >> GO TO 8. NG >> GO TO 7.

[QR25DE]

7. DETECT MALFUNCTIONING PART
Check the following for leak. G Hose G Radiator G Water pump (Refer to CO-28, "WATER PUMP" .)
>> Repair or replace.
8. CHECK RADIATOR CAP
Apply pressure to cap with a tester. Radiator cap relief pressure: 59 - 98 kPa (0.6 - 1.0 kg/cm2 , 9 - 14 psi)
OK or NG OK >> GO TO 9. NG >> Replace radiator cap.

9. CHECK COMPONENT PARTS
Check the following. G Thermostat. Refer to CO-30, "THERMOSTAT AND THERMOSTAT HOUSING" . G Engine coolant temperature sensor. Refer to EC-1055, "Component Inspection" . OK or NG
OK >> GO TO 10. NG >> Replace malfunctioning component.
10. CHECK MAIN 12 CAUSES
If the cause cannot be isolated, go to EC-1054, "Main 12 Causes of Overheating" .
>> INSPECTION END

Revision: December 2006

EC-1050

SLC754A SLC755A
2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
PROCEDURE A
1. CHECK POWER SUPPLY
1. Turn ignition switch OFF. 2. Disconnect cooling fan relay-1. 3. Turn ignition switch ON. 4. Check voltage between cooling fan relay-1 terminals 1, 3, 6 and
ground with CONSULT-II or tester.
Voltage: Battery voltage OK or NG
OK >> GO TO 3. NG >> GO TO 2.

[QR25DE]
A EC
C D E

2. DETECT MALFUNCTIONING PART
Check the following. G Fuse block (J/B) connector E103 G Fuse and fusible link box connectors E23, E25 G 10A fuse G 40A fusible links G Harness for open or short between cooling fan relay-1 and fuse G Harness for open or short between cooling fan relay-1 and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
3. CHECK COOLING FAN GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect cooling fan motor-1 harness connector and cooling
fan motor-2 harness connector. 3. Check harness continuity between the following;
cooling fan relay-1 terminal 5 and cooling fan motor-1 terminal 1, cooling fan motor-1 terminal 4 and ground. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. 5. Check harness continuity between the following;
cooling fan relay-1 terminal 7 and cooling fan motor-2 terminal 1, cooling fan motor-2 terminal 4 and ground. Refer to Wiring Diagram.
Continuity should exist.
6. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB0951E

F

G H

I

J

K

L

M

BBIA0306E

Revision: December 2006

EC-1051

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
4. CHECK OUTPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 97 and cooling fan relay-1 terminal 2.
Refer to Wiring Diagram.
Continuity should exist. 3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 6. NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E9, F47 G Harness for open or short between cooling fan relay-1 and ECM

[QR25DE]

>> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK COOLING FAN RELAY-1
Refer to EC-1055, "Component Inspection" . OK or NG
OK >> GO TO 7. NG >> Replace cooling fan relay.
7. CHECK COOLING FAN MOTORS-1 AND -2
Refer to EC-1055, "Component Inspection" . OK or NG
OK >> GO TO 8. NG >> Replace cooling fan motors.
8. CHECK INTERMITTENT INCIDENT
Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-1052

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
PROCEDURE B
1. CHECK COOLING FAN POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect cooling fan relay-2 and relay-3. 3. Turn ignition switch ON. 4. Check voltage between cooling fan relay-2 and relay-3 terminals
1, 3 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 3. NG >> GO TO 2.

[QR25DE]
A EC
C D E

2. DETECT MALFUNCTIONING PART
Check the following. G Harness for open or short between cooling fan relay-2, relay-3 and fuse G Harness for open or short between cooling fan relay-2, relay-3 and fusible link
>> Repair harness or connectors.
3. CHECK COOLING FAN MOTORS CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect cooling fan motor-1 harness connector and cooling
fan motor-2 harness connector. 3. Check harness continuity between the following;
cooling fan motor-1 terminal 2 and cooling fan relay-2 terminal 5, cooling fan motor-1 terminal 3 and cooling fan relay-2 terminal 6, cooling fan relay-2 terminal 7and ground. Refer to wiring diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. 5. Check harness continuity between the following;
cooling fan motor-2 terminal 2 and cooling fan relay-3 terminal 5, cooling fan motor-2 terminal 3 and cooling fan relay-3 terminal 6, cooling fan relay-3 terminal 7and ground. Refer to wiring diagram.
Continuity should exist.
6. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB1771E

F

G H

I

J

K

L

BBIA0306E

M

Revision: December 2006

EC-1053

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE
4. CHECK COOLING FAN OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

[QR25DE]

1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 89 and cooling fan relay-2 and relay-3 terminals 2.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 6. NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART

Check the following. G Harness connectors E9, F47 G Harness for open or short between cooling fan relay-2 and ECM G Harness for open or short between cooling fan relay-3 and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK COOLING FAN RELAY-2 AND RELAY-3
Refer to EC-1055, "Component Inspection" . OK or NG
OK >> GO TO 7. NG >> Replace cooling fan relays.
7. CHECK COOLING FAN MOTORS-1 AND -2
Refer to EC-1055, "Component Inspection" . OK or NG
OK >> GO TO 8. NG >> Replace cooling fan motors.
8. CHECK INTERMITTENT INCIDENT
Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Main 12 Causes of Overheating

Engine OFF

Step 1
2 3

Inspection item G Blocked radiator G Blocked condenser G Blocked radiator grille G Blocked bumper G Coolant mixture G Coolant level

Equipment G Visual
G Coolant tester G Visual

ON*2

4

G Radiator cap

5

G Coolant leaks

G Pressure tester G Visual

Standard No blocking

UBS00KJS
Reference page --

50 - 50% coolant mixture See MA-14 .

Coolant up to MAX level See MA-23 . in reservoir tank and radiator filler neck

59 - 98 kPa (0.6 - 1.0 kg/ See CO-27 . cm2 , 9 - 14 psi) (Limit)

No leaks

See CO-26 .

Revision: December 2006

EC-1054

2006 Sentra

DTC P1217 ENGINE OVER TEMPERATURE

[QR25DE]

Engine ON*2

Step 6

Inspection item G Thermostat

Equipment

Standard

Reference page

A
G Touch the upper and Both hoses should be hot See CO-30 and CO-32 .

lower radiator hoses

ON*1

7

G Cooling fan

G CONSULT-II

Operating

See trouble diagnosis for
DTC P1217 (EC-1043 ). EC

OFF ON*3

8

G Combustion gas leak G Color checker chemical Negative

tester 4 Gas analyzer

9

G Coolant temperature G Visual

gauge

Gauge less than 3/4 when driving

--

--

C

G Coolant overflow to reservoir tank

G Visual

No overflow during driv- See CO-26 .

ing and idling

D

OFF*4

10 G Coolant return from

G Visual

reservoir tank to radia-

tor

Should be initial level in See CO-26 . reservoir tank
E

OFF

11

G Cylinder head

G Straight gauge feeler gauge

0.1 mm (0.004 in) Maxi- See EM-164 . mum distortion (warping)

12 G Cylinder block and pis- G Visual tons

No scuffing on cylinder See EM-164 .

F

walls or piston

*1: Turn the ignition switch ON. *2: Engine running at 3,000 rpm for 10 minutes. *3: Drive at 90 km/h (56 MPH) for 30 minutes and then let idle for 10 minutes. *4: After 60 minutes of cool down time. For more information, refer to CO-23, "OVERHEATING CAUSE ANALYSIS" .
Component Inspection
COOLING FAN RELAY-1, -2 AND -3 Check continuity between terminals 3 and 5, 6 and 7.

G
H
UBS00KJT
I

Conditions

Continuity

12V direct current supply between terminals 1 and 2

Yes

J

No current supply

No

If NG, replace relay. K

COOLING FAN MOTOR-1 AND -2 1. Disconnect cooling fan motor harness connectors.
2. Supply cooling fan motor terminals with battery voltage and check operation.

Speed

Cooling fan motor

Low High

Cooling fan motor should operate. If NG, replace cooling fan motor.

Terminals

(+)

(-)

1

4

1, 2

3, 4

PBIB0077E

L

M

SEF734W

Revision: December 2006

EC-1055

2006 Sentra

DTC P1225 TP SENSOR
DTC P1225 TP SENSOR
Component Description
Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement. The throttle position sensor has two sensors. These sensors are a kind of potentiometers which transform the throttle valve position into output voltage, and emit the voltage signal to the ECM. In addition, these sensors detect the opening and closing speed of the throttle valve and feed the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.
On Board Diagnosis Logic
The MIL will not light up for this diagnosis.

[QR25DE]
PFP:16119
UBS00JJ5
PBIB0145E UBS00JJ6

DTC No.
P1225 1225

Trouble diagnosis name

DTC detecting condition

Possible cause

Closed throttle position Closed throttle position learning value is exces- G Electric throttle control actuator

learning performance sively low.

(TP sensor 1 and 2)

DTC Confirmation Procedure

UBS00JJ7

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Turn ignition switch OFF, wait at least 10 seconds. 4. Turn ignition switch ON. 5. If 1st trip DTC is detected, go to EC-1057, "Diagnostic Proce-
dure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-1056

2006 Sentra

DTC P1225 TP SENSOR
Diagnostic Procedure
1. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Turn ignition switch OFF. 2. Remove the intake air duct. 3. Check if foreign matter is caught between the throttle valve and
the housing. OK or NG
OK >> GO TO 2. NG >> Remove the foreign matter and clean the electric throttle
control actuator inside.
2. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. 2. Perform EC-671, "Throttle Valve Closed Position Learning" . 3. Perform EC-671, "Idle Air Volume Learning" .
>> INSPECTION END
Removal and Installation
ELECTRIC THROTTLE CONTROL ACTUATOR Refer to EM-108, "INTAKE MANIFOLD" .

[QR25DE]
UBS00JJ8
A
EC
C
D
E
BBIA0079E
F
G
H
UBS00JJ9
I
J
K
L
M

Revision: December 2006

EC-1057

2006 Sentra

DTC P1226 TP SENSOR
DTC P1226 TP SENSOR
Component Description
Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement. The throttle position sensor has two sensors. These sensors are a kind of potentiometers which transform the throttle valve position into output voltage, and emit the voltage signal to the ECM. In addition, these sensors detect the opening and closing speed of the throttle valve and feed the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.
On Board Diagnosis Logic
The MIL will not light up for this diagnosis.

[QR25DE]
PFP:16119
UBS00JJA
PBIB0145E UBS00JJB

DTC No.
P1226 1226

Trouble diagnosis name

DTC detecting condition

Closed throttle position Closed throttle position learning is not perlearning performance formed successfully, repeatedly.

Possible cause
G Electric throttle control actuator (TP sensor 1 and 2)

DTC Confirmation Procedure

UBS00JJC

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Turn ignition switch OFF, wait at least 10 seconds. 4. Turn ignition switch ON. 5. Repeat steps 3 and 4 for 32 times. 6. If 1st trip DTC is detected, go to EC-1059, "Diagnostic Proce-
dure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-1058

2006 Sentra

DTC P1226 TP SENSOR
Diagnostic Procedure
1. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Turn ignition switch OFF. 2. Remove the intake air duct. 3. Check if foreign matter is caught between the throttle valve and
the housing. OK or NG
OK >> GO TO 2. NG >> Remove the foreign matter and clean the electric throttle
control actuator inside.
2. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. 2. Perform EC-671, "Throttle Valve Closed Position Learning" . 3. Perform EC-671, "Idle Air Volume Learning" .
>> INSPECTION END
Removal and Installation
ELECTRIC THROTTLE CONTROL ACTUATOR Refer to EM-108, "INTAKE MANIFOLD" .

[QR25DE]
UBS00JJD
A
EC
C
D
E
BBIA0079E
F
G
H
UBS00JJE
I
J
K
L
M

Revision: December 2006

EC-1059

2006 Sentra

DTC P1564 ASCD STEERING SWITCH

[QR25DE]

DTC P1564 ASCD STEERING SWITCH

PFP:25551

Component Description

UBS00JLC

ASCD steering switch has variant values of electrical resistance for each button. ECM reads voltage variation of switch, and determines which button is operated.

Refer to EC-623, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)" for ASCD functions.

PBIB2599E

CONSULT-II Reference Value in Data Monitor Mode

UBS00JLD

Specification data are reference values.

MONITOR ITEM MAIN SW CANCEL SW
RESUME/ACC SW

G Ignition switch: ON G Ignition switch: ON G Ignition switch: ON

CONDITION MAIN switch: Pressed MAIN switch: Released CANCEL switch: Pressed CANCEL switch: Released RESUME/ACCELERATE switch: Pressed RESUME/ACCELERATE switch: Released

SPECIFICATION ON OFF ON OFF ON
OFF

SET SW

G Ignition switch: ON

SET/COAST switch: Pressed SET/COAST switch: Released

ON OFF

On Board Diagnosis Logic

UBS00JLE

This self-diagnosis has the one trip detection logic. The MIL will not light up for this diagnosis.
NOTE: If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to EC-1030 .

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

P1564 1564

ASCD steering switch

G An excessively high voltage signal from the ASCD steering switch is sent to ECM.
G ECM detects that input signal from the ASCD steering switch is out of the specified range.
G ECM detects that the ASCD steering switch is stuck ON.

G Harness or connectors (The switch circuit is open or shorted.)
G ASCD steering switch G ECM

Revision: December 2006

EC-1060

2006 Sentra

DTC P1564 ASCD STEERING SWITCH

[QR25DE]

DTC Confirmation Procedure

UBS00JLF

NOTE:

A

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

EC
WITH CONSULT-II

1. Turn ignition switch ON.

2. Select "DATA MONITOR" mode with CONSULT-II.

C

3. Wait at least 10 seconds.

4. Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.

5. Press RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 sec- D onds.

6. Press SET/COAST switch for at least 10 seconds, then release it and wait at least 10 seconds.

7. Press CANCEL switch for at least 10 seconds, then release it and wait at least 10 seconds.

E

8. If DTC is detected, go to EC-1063, "Diagnostic Procedure" .

WITH GST
F Follow the procedure "WITH CONSULT-II" above.

G

H

I

J

K

L

M

Revision: December 2006

EC-1061

2006 Sentra

Wiring Diagram

DTC P1564 ASCD STEERING SWITCH

[QR25DE]
UBS00JLG

Revision: December 2006

EC-1062

BBWA2161E
2006 Sentra

DTC P1564 ASCD STEERING SWITCH

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

67 B/W

Sensor ground (MAF sensor, IAT sensor, ECT sensor, EVAP control system pressure sensor, PSP sensor, ASCD steering switch, Refrigerant pressure sensor)

[Engine is running] G Warm-up condition G Idle speed

C
Approximately 0V
D

[Ignition switch: ON]

G ASCD steering switch: OFF

Approximately 4V

E

[Ignition switch: ON] G MAIN switch: Pressed

Approximately 0V

[Ignition switch: ON]

F

99 W/R

ASCD steering switch

G CANCEL switch: Pressed

Approximately 1V

[Ignition switch: ON]

G

G RESUME/ACCELERATE switch:

Approximately 3V

Pressed

[Ignition switch: ON]

Approximately 2V

H

G SET/COAST switch: Pressed

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS00JLH
I

1. Turn ignition switch OFF.

2. Loosen and retighten engine two screws on the body.

J

Refer to EC-742, "Ground Inspection" .

K

L

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

M
BBIA0515E

Revision: December 2006

EC-1063

2006 Sentra

DTC P1564 ASCD STEERING SWITCH

2. CHECK ASCD STEERING SWITCH CIRCUIT

With CONSULT-II 1. Turn ignition switch ON. 2. Select "MAIN SW", "RESUME/ACC SW", "SET SW and "CAN-
CEL SW" in "DATA MONITOR" mode with CONSULT-II. 3. Check each item indication under the following conditions.

Switch MAIN switch

Monitor item MAIN SW

CANCEL switch CANCEL SW

RESUME/ ACCELERATE switch
SET/COAST switch

RESUME/ACC SW SET SW

Condition Pressed Released Pressed Released Pressed Released Pressed Released

Indication ON OFF ON OFF ON OFF ON OFF

Without CONSULT-II
1. Turn ignition switch ON. 2. Check voltage between ECM terminal 99 and ground with press-
ing each button.

Switch MAIN switch
CANCEL switch
RESUME/ACCELERATE switch
SET/COAST switch
OK or NG OK >> GO TO 8. NG >> GO TO 3.

Condition Pressed Released Pressed Released Pressed Released Pressed Released

Voltage [V] Approx. 0 Approx. 4 Approx. 1 Approx. 4 Approx. 3 Approx. 4 Approx. 2 Approx. 4

[QR25DE]
SEC006D PBIB0311E

Revision: December 2006

EC-1064

2006 Sentra

DTC P1564 ASCD STEERING SWITCH
3. CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ASCD steering switch harness connector.

[QR25DE]
A EC

C

D

E
PBIB2599E

3. Disconnect ECM harness connector.

4. Check harness continuity between ASCD steering switch terminal 1 and ECM terminal 67.

Refer to Wiring Diagram.

F

Continuity should exist.

5. Also check harness for short to ground and short to power.

G

OK or NG

OK >> GO TO 5.

NG >> GO TO 4.

H

4. DETECT MALFUNCTIONING PART

Check the following.

I

G Harness connectors M401, M102

G Harness connectors M59, F27

J

G Spiral cable

G Harness for open or short between ECM and ASCD steering switch

K

>> Repair open circuit or short to ground or short to power in harness or connectors.

5. CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

L

1. Check harness continuity between ECM terminal 99 and ASCD steering switch terminal 4. Refer to Wiring Diagram. M Continuity should exist.
2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 7. NG >> GO TO 6.
6. DETECT MALFUNCTIONING PART

Check the following. G Harness connectors M401, M102 G Harness connectors M59, F27 G Spiral cable G Harness for open or short between ECM and ASCD steering switch

>> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-1065

2006 Sentra

DTC P1564 ASCD STEERING SWITCH

7. CHECK ASCD STEERING SWITCH
Refer to EC-1066, "Component Inspection" . OK or NG
OK >> GO TO 8. NG >> Replace ASCD steering switch.
8. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
ASCD STEERING SWITCH 1. Disconnect ASCD steering switch.
2. Check continuity between ASCD steering switch terminals 1 and 4 with pushing each switch.

Switch MAIN switch
CANCEL switch RESUME/ACCELERATE switch COAST/SET switch

Condition Pressed Released Pressed Released Pressed Released Pressed Released

Resistance [] Approx. 0
Approx. 4,000 Approx. 250 Approx. 4,000 Approx. 1,480 Approx. 4,000 Approx. 660 Approx. 4,000

[QR25DE]
UBS00JLI PBIB0934E

Revision: December 2006

EC-1066

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH
DTC P1572 ASCD BRAKE SWITCH Component Description
When the brake pedal is depressed, ASCD brake switch is turned OFF and stop lamp switch is turned ON. ECM detects the state of the brake pedal by this input of two kinds (ON/OFF signal). Refer to EC-623, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)" for ASCD functions.

[QR25DE]
PFP:25320
A
UBS00JLJ
EC
C

D

CONSULT-II Reference Value in Data Monitor Mode

BBIA0117E
E
UBS00JLK

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

F

G Clutch pedal (M/T) and brake pedal: Fully released

ON

BRAKE SW1 (ASCD brake switch)

G Ignition switch: ON

G Clutch pedal (M/T) and/or

G

brake pedal: Slightly

OFF

depressed

Brake pedal: Fully released

OFF

H

BRAKE SW2 (Stop lamp switch)

G Ignition switch: ON

Brake pedal: Slightly depressed

ON

On Board Diagnosis Logic

I
UBS00JLL

This self-diagnosis has the one trip detection logic.

The MIL will not light up for this diagnosis.

J

NOTE:

G If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.

Refer to EC-1030 . K
G This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not

stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.

1st trip DTC is erased when ignition switch OFF. And even when malfunction A is detected in two

consecutive trips, DTC is not stored in ECM memory.

L

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

M

When the vehicle speed is above 30km/h G Harness or connectors

A)

(19 MPH), ON signals from the stop lamp switch and the ASCD brake switch are sent

(The stop lamp switch circuit is shorted.) G Harness or connectors

to ECM at the same time.

(The ASCD brake switch circuit is shorted.)

G Harness or connectors (The ASCD clutch switch circuit is shorted.) (M/T models)

P1572 1572

ASCD brake switch

G Stop lamp switch

ASCD brake switch signal is not sent to

G ASCD brake switch

B) ECM for extremely long time while the vehi- G ASCD clutch switch (M/T models)

cle is driving

G Incorrect stop lamp switch installation

G Incorrect ASCD brake switch installation

G Incorrect ASCD clutch switch installation (M/T models)

G ECM

Revision: December 2006

EC-1067

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH

[QR25DE]

DTC Confirmation Procedure

UBS00JLM

CAUTION: Always drive vehicle at a safe speed.
NOTE: G If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait
at least 10 seconds before conducting the next test.
G Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for malfunction B. By performing procedure for malfunction A, the incident that causes malfunction B can be detected.
TESTING CONDITION: Steps 4 and 5 may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.

WITH CONSULT-II 1. Start engine.
2. Select "DATA MONITOR" mode with CONSULT-II.
3. Press MAIN switch and make sure that CRUISE indicator lights up.
4. Drive the vehicle for at least 5 consecutive seconds under the following condition.

VHCL SPEED SE Shift lever

More than 30 km/h (19 MPH) Suitable position

If 1st trip DTC is detected, go to EC-1071, "Diagnostic Procedure" . If 1st trip DTC is not detected, go to the following step.

PBIB2386E

5. Drive the vehicle for at least 5 consecutive seconds under the following condition.

VHCL SPEED SE

More than 30 km/h (19 MPH)

Shift lever

Suitable position

Driving location

Depress the brake pedal for more than 5 seconds so as not to come off from the above-mentioned vehicle speed.

6. If 1st trip DTC is detected, go to EC-1071, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

Revision: December 2006

EC-1068

2006 Sentra

Wiring Diagram

DTC P1572 ASCD BRAKE SWITCH

[QR25DE]
UBS00JLN
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1069

BBWA2162E
2006 Sentra

DTC P1572 ASCD BRAKE SWITCH

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

101 R/G

Stop lamp switch

[Ignition switch: OFF] G Brake pedal: Fully released [Ignition switch: OFF] G Brake pedal: Slightly depressed

Approximately 0V
BATTERY VOLTAGE (11 - 14V)

108 P/L

ASCD brake switch

[Ignition switch: ON] G Brake pedal: Slightly depressed (A/T) G Brake pedal and/or clutch pedal: Slightly
depressed (M/T)
[Ignition switch: ON] G Brake pedal: Fully released (A/T) G Brake pedal and clutch pedal: Fully released
(M/T)

Approximately 0V
BATTERY VOLTAGE (11 - 14V)

Revision: December 2006

EC-1070

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH

Diagnostic Procedure
1. CHECK OVERALL FUNCTION-I

With CONSULT-II 1. Turn ignition switch ON. 2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT-II. 3. Check "BRAKE SW1" indication under the following conditions.

A/T models

CONDITION Brake pedal: Slightly depressed Brake pedal: Fully released

INDICATION OFF ON

M/T models

CONDITION Clutch pedal and/or brake pedal: Slightly depressed Clutch pedal and brake pedal: Fully released

INDICATION OFF ON

Without CONSULT-II 1. Turn ignition switch ON. 2. Check voltage between ECM terminal 108 and ground under the following conditions.

A/T models

CONDITION Brake pedal: Slightly depressed

VOLTAGE Approximately 0V

Brake pedal: Fully released

Battery voltage

M/T models

CONDITION

VOLTAGE

Clutch pedal and/or brake pedal: Slightly depressed

Approximately 0V

Clutch pedal and brake pedal: Fully released

Battery voltage

OK or NG
OK >> GO TO 2. NG (M/T models) >>GO TO 3. NG (A/T models) >>GO TO 4.

[QR25DE]
UBS00JLO
A
EC
C
D
E
F
SEC011D
G
H
I
J
K
MBIB0061E
L
M

Revision: December 2006

EC-1071

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH

2. CHECK OVERALL FUNCTION-II

With CONSULT-II Check "BRAKE SW2" indication in "DATA MONITOR" mode.

CONDITION Brake pedal: Fully released Brake pedal: Slightly depressed

INDICATION OFF ON

Without CONSULT-II Check voltage between ECM terminal 101 and ground under the following conditions.

CONDITION Brake pedal: Fully released Brake pedal: Slightly depressed

VOLTAGE Approximately 0V
Battery voltage

OK or NG OK >> GO TO 18. NG >> GO TO 13.
3. CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect ASCD clutch switch harness connector. 3. Turn ignition switch ON.

[QR25DE]
SEC013D MBIB0060E

4. Check voltage between ASCD clutch switch terminal 1 and ground under the following conditions with CONSULT-II or tester.

CONDITION
Brake pedal: Fully released
Brake pedal: Slightly depressed
OK or NG OK >> GO TO 10. NG >> GO TO 4.

VOLTAGE Battery voltage
Approx. 0V

Revision: December 2006

EC-1072

BBIA0118E
PBIB0799E
2006 Sentra

DTC P1572 ASCD BRAKE SWITCH
4. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect ASCD brake switch harness connector. 3. Turn ignition switch ON.

[QR25DE]
A EC
C

D

4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK (M/T models)>>GO TO 6. OK (A/T models)>>GO TO 7. NG >> GO TO 5.

BBIA0117E
E
F
G
H

5. DETECT MALFUNCTIONING PART

PBIB0857E
I

Check the following.

G Fuse block (J/B) connector M1

J

G 10A fuse

G Harness for open or short between ASCD brake switch and fuse K

>> Repair open circuit or short to ground or short to power in harness or connectors.

6. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

L

1. Turn ignition switch OFF.

2. Check harness continuity between ASCD brake switch terminal 2 and ASCD clutch switch terminal 1.

M

Refer to Wiring Diagram.

Continuity should exist.

3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-1073

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH
7. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 108 and ASCD brake switch terminal 2.
Refer to Wiring Diagram.
Continuity should exist. 4. Also check harness for short to ground or short to power. OK or NG
OK >> GO TO 9. NG >> GO TO 8.
8. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and ASCD brake switch

[QR25DE]

>> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK ASCD BRAKE SWITCH
Refer to EC-1076, "Component Inspection" . OK or NG
OK >> GO TO 18. NG >> Replace ASCD brake switch.
10. CHECK ASCD CLUTCH SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 108 and ASCD clutch switch terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 12. NG >> GO TO 11.
11. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and ASCD clutch switch

>> Repair open circuit or short to ground or short to power in harness or connectors.
12. CHECK ASCD CLUTCH SWITCH
Refer to EC-1076, "Component Inspection" . OK or NG
OK >> GO TO 18. NG >> Replace ASCD clutch switch.

Revision: December 2006

EC-1074

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH
13. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect stop lamp switch harness connector.

[QR25DE]
A EC

C

3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-II or tester.

D
BBIA0105E
E
F

G

H

Voltage: Battery voltage
OK or NG OK >> GO TO 15. NG >> GO TO 14.
14. DETECT MALFUNCTIONING PART

PBIB2284E
I J K

Check the following.

G Fuse block (J/B) connector M2

L

G 10A fuse

G Harness for open or short between stop lamp switch and battery

M

>> Repair open circuit or short to ground or short to power in harness or connectors.

15. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 17. NG >> GO TO 16.

Revision: December 2006

EC-1075

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH
16. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and stop lamp switch

[QR25DE]

>> Repair open circuit or short to ground or short to power in harness or connectors.
17. CHECK STOP LAMP SWITCH
Refer to EC-1076, "Component Inspection" . OK or NG
OK >> GO TO 18. NG >> Replace stop lamp switch.
18. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Component Inspection
ASCD BRAKE SWITCH

UBS00JLP

1. Turn ignition switch OFF.

2. Disconnect ASCD brake switch harness connector.

3. Check harness continuity between ASCD brake switch terminals 1 and 2 under the following conditions.

Condition

Continuity

Brake pedal: Fully released

Should exist

Brake pedal: Slightly depressed

Should not exist

If NG, adjust ASCD brake switch installation, refer to BR-11, "BRAKE PEDAL AND BRACKET" , and perform step 3 again.

SEC023D

Revision: December 2006

EC-1076

2006 Sentra

DTC P1572 ASCD BRAKE SWITCH

[QR25DE]

ASCD CLUTCH SWITCH (FOR M/T MODELS)

1. Turn ignition switch OFF.

A

2. Disconnect ASCD clutch switch harness connector.

3. Check harness continuity between ASCD clutch switch terminals 1 and 2 under the following conditions. EC

Condition

Continuity

Clutch pedal: Fully released

Should exist

Clutch pedal: Slightly depressed

Should not exist

C

If NG, adjust ASCD clutch switch installation, refer to CL-23,
"CLUTCH SYSTEM" , and perform step 3 again. D

E
SEC024D

STOP LAMP SWITCH

1. Turn ignition switch OFF.

F

2. Disconnect stop lamp switch harness connector.

3. Check harness continuity between stop lamp switch terminals 1 and 2 under the following conditions.

G

H

I

PBIB2285E

J

Condition

Continuity

Brake pedal: Fully released

Should not exist

K

Brake pedal: Slightly depressed

Should exist

If NG, adjust stop lamp switch installation, refer to BR-11, "BRAKE PEDAL AND BRACKET" , and perform step 3 again.

L

M

Revision: December 2006

EC-1077

2006 Sentra

DTC P1574 ASCD VEHICLE SPEED SENSOR

[QR25DE]

DTC P1574 ASCD VEHICLE SPEED SENSOR

PFP:31036

Component Description

UBS00JLQ

The ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from combination meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD control. Refer to EC-623, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)" for ASCD functions.

On Board Diagnosis Logic

UBS00JLR

This self-diagnosis has the one trip detection logic. The MIL will not light up for this diagnosis.
NOTE: G If DTC P1574 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-743, "DTC U1000, U1001 CAN COMMUNICATION LINE" .
G If DTC P1574 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to EC-746, "DTC U1010 CAN COMMUNICATION".
G If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer to EC-1015, "DTC P0500 VSS"
G If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to EC-1030, "DTC P0605 ECM"

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

P1574 1574

ASCD vehicle speed sensor

ECM detects a difference between two vehicle speed signals is out of the specified range.

G Harness or connectors (The CAN communication line is open or shorted.)
G TCM (A/T models)
G Combination meter G Vehicle speed sensor G ECM

DTC Confirmation Procedure

UBS00JLS

CAUTION: Always drive vehicle at a safe speed.
NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Step 3 may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.

WITH CONSULT-II 1. Start engine. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Drive the vehicle at more than 40 km/h (25MPH). 4. If DTC is detected, go to EC-1079, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

Revision: December 2006

EC-1078

SEF058Y
2006 Sentra

DTC P1574 ASCD VEHICLE SPEED SENSOR
Diagnostic Procedure
1. CHECK DTC WITH TCM

[QR25DE]
UBS00JLT
A

Check DTC with TCM. Refer to AT-425, "ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION" .

OK or NG

EC

OK >> GO TO 2.

NG >> Perform trouble shooting relevant to DTC indicated.

2. CHECK COMBINATION METER

C

Check combination meter function.

Refer to DI-16, "Meter/Gauge Operation and Odo/Trip Meter Segment Check in Diagnosis Mode" .

D

>> INSPECTION END

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-1079

2006 Sentra

DTC P1800 VIAS CONTROL SOLENOID VALVE
DTC P1800 VIAS CONTROL SOLENOID VALVE Component Description
The VIAS control solenoid valve cuts the intake manifold vacuum signal for power valve actuator. It responds to ON/OFF signals from the ECM. When the solenoid is OFF, the vacuum signal from the intake manifold is cut. When the ECM sends an ON signal the coil pulls the plunger downward and feeds the vacuum signal to the power valve actuator.

[QR25DE]
PFP:14955
UBS00KK7

CONSULT-II Reference Value in Data Monitor Mode

BBIA0022E UBS00KK8

Specification data are reference values.

MONITOR ITEM VIAS S/V

G Engine: After warming up

CONDITION Idle More than 5,000 rpm

SPECIFICATION OFF ON

On Board Diagnosis Logic
The MIL will not light up for this self-diagnosis.

UBS00KK9

DTC No.
P1800 1800

Trouble diagnosis name
VIAS control solenoid valve circuit

DTC detecting condition
An excessively low or high voltage signal is sent to ECM through the valve

Possible cause
G Harness or connectors (The solenoid valve circuit is open or shorted.)
G VIAS control solenoid valve

DTC Confirmation Procedure

UBS00KKA

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is between 11V at idle.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for at least 5 seconds. 4. If 1st trip DTC is detected, go to EC-1082, "Diagnostic Proce-
dure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-1080

2006 Sentra

DTC P1800 VIAS CONTROL SOLENOID VALVE Wiring Diagram

[QR25DE]
UBS00KKB
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1081

BBWA2271E
2006 Sentra

DTC P1800 VIAS CONTROL SOLENOID VALVE

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

29 Y/R

111 W/G

119 120

R/G

VIAS control solenoid valve
ECM relay (Self shut-off) Power supply for ECM

[Engine is running] G Idle speed [Engine is running] G Engine speed: Above 5,000 rpm [Engine is running] [Ignition switch: OFF] G For a few seconds after turning ignition
switch OFF [Ignition switch: OFF] G More than a few seconds after turning
ignition switch OFF
[Ignition switch: ON]

BATTERY VOLTAGE (11 - 14V) 0 - 1.0V
0 - 1.0V
BATTERY VOLTAGE (11 - 14V) BATTERY VOLTAGE (11 - 14V)

Diagnostic Procedure
1. CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT-I

UBS00KKC

1. Turn ignition switch OFF. 2. Disconnect VIAS control solenoid valve harness connector. 3. Turn ignition switch ON.

4. Check voltage between terminal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 2. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

BBIA0022E PBIB0173E

Revision: December 2006

EC-1082

2006 Sentra

DTC P1800 VIAS CONTROL SOLENOID VALVE

[QR25DE]

2. CHECK VIAS CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT A

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between ECM terminal 29 and VIAS control solenoid valve terminal 2.

EC

Refer to Wiring Diagram.

Continuity should exist.

C

4. Also check harness for short to ground and short to power.

OK or NG

OK >> GO TO 3.

D

NG >> Repair open circuit or short to ground or short to power in harness or connectors.

3. CHECK VIAS CONTROL SOLENOID VALVE

E

Refer to EC-1083, "Component Inspection" .

OK or NG

OK >> GO TO 4.

F

NG >> Replace VIAS control solenoid valve.

4. CHECK INTERMITTENT INCIDENT

G

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Component Inspection
VIAS CONTROL SOLENOID VALVE With CONSULT-II
1. Reconnect harness connectors disconnected. 2. Turn ignition switch ON. 3. Perform "VIAS SOL VALVE" in "ACTIVE TEST" mode. 4. Check air passage continuity and operation delay time under the
following conditions.

H
UBS00KKD
I J K

Condition

Air passage continuity

Air passage continuity

VIAS SOL VALVE

between A and B

between A and C

L

ON

Yes

No

OFF

No

Yes

M Operation takes less than 1 second.

Without CONSULT-II
Check air passage continuity and operation delay time under the following conditions.

Condition
12V direct current supply between terminals 1 and 2 No supply

Air passage continuity between A and B
Yes
No

Air passage continuity between A and C
No
Yes

Operation takes less than 1 second.

PBIB2505E PBIB2532E

Revision: December 2006

EC-1083

2006 Sentra

DTC P1800 VIAS CONTROL SOLENOID VALVE
Removal and Installation
VIAS CONTROL SOLENOID VALVE Refer to EM-108, "INTAKE MANIFOLD" .

[QR25DE]
UBS00KKE

Revision: December 2006

EC-1084

2006 Sentra

DTC P1805 BRAKE SWITCH

[QR25DE]

DTC P1805 BRAKE SWITCH Description

PFP:25320
A
UBS00KKF

Brake switch signal is applied to the ECM through the stop lamp switch when the brake pedal is depressed.

This signal is used mainly to decrease the engine speed when the vehicle is driving.

EC

CONSULT-II Reference Value in Data Monitor Mode

UBS00KKG

Specification data are reference values.
MONITOR ITEM

CONDITION

C
SPECIFICATION

Brake pedal: Fully released

OFF

BRAKE SW

G Ignition switch: ON

Brake pedal: Slightly depressed

ON

D

On Board Diagnosis Logic
The MIL will not light up for this diagnosis.

UBS00KKH
E

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

P1805 1805

Brake switch

A brake switch signal is not sent to ECM for G Harness or connectors

F

an extremely long time while the vehicle is

(Stop lamp switch circuit is open or shorted.)

driving.

G Stop lamp switch

FAIL-SAFE MODE

G

When the malfunction is detected, the ECM enters fail-safe mode.

Engine operating condition in fail-safe mode

ECM controls the electric throttle control actuator by regulating the throttle opening to a small range. Therefore, acceleration will be poor.

Vehicle condition

Driving condition

When engine is idling

Normal

When accelerating

Poor acceleration

DTC Confirmation Procedure
WITH CONSULT-II 1. Turn ignition switch ON.
2. Fully depress the brake pedal for at least 5 seconds.
3. Erase the DTC with CONSULT-II.
4. Select "DATA MONITOR" mode with CONSULT-II.
5. If 1st trip DTC is detected, go to EC-1087, "Diagnostic Procedure" .

H
I J
UBS00KKI
K L M

WITH GST Follow the procedure "WITH CONSULT-II" above.

PBIB1952E

Revision: December 2006

EC-1085

2006 Sentra

Wiring Diagram

DTC P1805 BRAKE SWITCH

[QR25DE]
UBS00KKJ

Revision: December 2006

EC-1086

BBWA2163E
2006 Sentra

DTC P1805 BRAKE SWITCH

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL
NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

101 R/G

Stop lamp switch

[Ignition switch: OFF] G Brake pedal: Fully released [Ignition switch: OFF] G Brake pedal: Slightly depressed

Approximately 0V

C

BATTERY VOLTAGE

(11 - 14V)

D

Diagnostic Procedure
1. CHECK STOP LAMP SWITCH CIRCUIT

UBS00KKK
E

1. Turn ignition switch OFF.

2. Check the stop lamp when depressing and releasing the brake pedal.

F

Brake pedal

Stop lamp

Fully released

Not illuminated

G

Slightly depressed

Illuminated

OK or NG

OK >> GO TO 4.

H

NG >> GO TO 2.

2. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT I 1. Disconnect stop lamp switch harness connector.

J

K

2. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-II or tester.

L
BBIA0105E
M

Voltage: Battery voltage OK or NG
OK >> GO TO 4. NG >> GO TO 3.
Revision: December 2006

EC-1087

PBIB2284E
2006 Sentra

DTC P1805 BRAKE SWITCH
3. DETECT MALFUNCTIONING PART
Check the following. G 10A fuse G Fuse block (J/B) connector M2 G Harness for open or short between stop lamp switch and battery

[QR25DE]

>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 6. NG >> GO TO 5.

5. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and stop lamp switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK STOP LAMP SWITCH
Refer to EC-1089, "Component Inspection" . OK or NG
OK >> GO TO 7. NG >> Replace stop lamp switch.
7. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END

BBIA0105E

Revision: December 2006

EC-1088

2006 Sentra

DTC P1805 BRAKE SWITCH
Component Inspection
STOP LAMP SWITCH 1. Disconnect stop lamp switch harness connector.

[QR25DE]
UBS00KKL
A
EC

C

2. Check continuity between stop lamp switch terminals 1 and 2 under the following conditions.

D
BBIA0105E
E

F

G

H
PBIB2285E

Conditions

Continuity

I

Brake pedal: Fully released

Should not exist.

Brake pedal: Slightly depressed

Should exist.

J If NG, adjust brake pedal installation, refer to BR-11, "BRAKE PEDAL AND BRACKET" , and perform step

2 again.

K

L

M

Revision: December 2006

EC-1089

2006 Sentra

DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
[QR25DE]

DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY

PFP:16119

Component Description

UBS00JI1

Power supply for the throttle control motor is provided to the ECM via throttle control motor relay. The throttle control motor relay is ON/OFF controlled by the ECM. When the ignition switch is turned ON, the ECM sends an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the ignition switch is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is not provided to the ECM.

CONSULT-II Reference Value in Data Monitor Mode

UBS00JI2

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

THRTL RELAY

G Ignition switch: ON

ON

On Board Diagnosis Logic

UBS00JI3

These self-diagnoses have one trip detection logic.

DTC No.
P2100 2100
P2103 2103

Trouble diagnosis name

DTC detecting condition

Throttle control motor relay circuit open

ECM detects a voltage of power source for throttle control motor is excessively low.

Throttle control motor relay circuit short

ECM detects the throttle control motor relay is stuck ON.

Possible cause
G Harness or connectors (Throttle control motor relay circuit is open)
G Throttle control motor relay
G Harness or connectors (Throttle control motor relay circuit is shorted)
G Throttle control motor relay

FAIL-SAFE MODE When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.

Engine operating condition in fail-safe mode

ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.

DTC Confirmation Procedure

UBS00JI4

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

PROCEDURE FOR DTC P2100 With CONSULT-II
1. Turn ignition switch ON and wait at least 2 seconds. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for 5 seconds. 4. If DTC is detected, go to EC-1094, "Diagnostic Procedure" .

With GST Follow the procedure "With CONSULT-II" above.

Revision: December 2006

EC-1090

SEF058Y
2006 Sentra

DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
[QR25DE]

PROCEDURE FOR DTC P2103

TESTING CONDITION:

A

Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

With CONSULT-II

1. Turn ignition switch ON and wait at least 1 second.

EC

2. Select "DATA MONITOR" mode with CONSULT-II.

3. If DTC is detected, go to EC-1094, "Diagnostic Procedure" .

C

D

With GST Follow the procedure "With CONSULT-II" above.

E
SEF058Y
F
G

H

I

J

K

L

M

Revision: December 2006

EC-1091

2006 Sentra

DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
[QR25DE]

Wiring Diagram

UBS00JI5

Revision: December 2006

EC-1092

BBWA2158E
2006 Sentra

DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.
3

WIRE COLOR

ITEM

R/W

Throttle control motor power supply

CONDITION [Ignition switch: ON]

DATA (DC Voltage)
C
BATTERY VOLTAGE (11 - 14V)

0 - 14V

D

[Ignition switch: ON]

4

P

Throttle control motor (Close)

G Engine stopped G Shift lever: D (A/T), 1ST (M/T)

E

G Accelerator pedal: Fully released

5

L

Throttle control motor (Open)

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully depressed

0 - 14V

PBIB0534E

F

G

H

104 P

Throttle control motor relay

[Ignition switch: OFF] [Ignition switch: ON]

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

PBIB0533E

BATTERY VOLTAGE

(11 - 14V)

I

0 - 1.0V

J

K

L

M

Revision: December 2006

EC-1093

2006 Sentra

DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
Diagnostic Procedure
1. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT

[QR25DE]
UBS00JI6

1. Turn ignition switch OFF. 2. Disconnect throttle control motor relay harness connector.

3. Check voltage between throttle control motor relay terminal 2, 5 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 3. NG >> GO TO 2.

BBIA0102E

2. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E10, F48 G Fuse and fusible link box connector E23 G 15A fuse G Harness for open or short between throttle control motor relay and battery

PBIB0575E

>> Repair or replace harness or connectors.
3. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector. 2. Check continuity between ECM terminal 3 and throttle control motor relay terminal 3.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-1094

2006 Sentra

DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY
[QR25DE]

4. CHECK THROTTLE CONTROL MOTOR RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT A

1. Check continuity between ECM terminal 104 and throttle control motor relay terminal 1. Refer to Wiring Diagram.

Continuity should exist.

EC

2. Also check harness for short to ground and short to power.

OK or NG

C

OK >> GO TO 5.

NG >> Repair open circuit or short to ground or short to power in harness or connectors.

5. CHECK THROTTLE CONTROL MOTOR RELAY

D

Refer to EC-1095, "Component Inspection" .

OK or NG

E

OK >> GO TO 6.

NG >> Replace throttle control motor relay.

6. CHECK INTERMITTENT INCIDENT

F

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

G

>> INSPECTION END
Component Inspection
THROTTLE CONTROL MOTOR RELAY 1. Apply 12V direct current between relay terminals 1 and 2. 2. Check continuity between relay terminals 3 and 5.

H
UBS00KK6
I

Conditions

Continuity

12V direct current supply between terminals 1 and 2

Yes

J

No current supply

No

3. If NG, replace throttle control motor relay.

K

L
PBIB0098E
M

Revision: December 2006

EC-1095

2006 Sentra

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
[QR25DE]

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION

PFP:16119

Description

UBS00JHU

NOTE: If DTC P2101 is displayed with DTC P2100 or P2119, first perform the trouble diagnosis for DTC P2100 or P2119. Refer to EC-1090, "DTC P2100, P2103 THROTTLE CONTROL MOTOR RELAY" or EC-1108, "DTC P2119 ELECTRIC THROTTLE CONTROL ACTUATOR" . Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle control motor is operated by the ECM and it opens and closes the throttle valve. The current opening angle of the throttle valve is detected by the throttle position sensor and it provides feedback to the ECM to control the throttle control motor to make the throttle valve opening angle properly in response to driving condition.

On Board Diagnosis Logic

UBS00JHV

This self-diagnosis has the one trip detection logic.

DTC No.
P2101 2101

Trouble diagnosis name

DTC detecting condition

Electric throttle control Electric throttle control function does not oper-

performance

ate properly.

Possible cause
G Harness or connectors (Throttle control motor circuit is open or shorted)
G Electric throttle control actuator

FAIL-SAFE MODE When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

Engine operating condition in fail-safe mode

ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.

DTC Confirmation Procedure

UBS00JHW

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11V when engine is running.

WITH CONSULT-II 1. Turn ignition switch ON and wait at least 2 seconds. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for 5 seconds. 4. If DTC is detected, go to EC-1098, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-1096

2006 Sentra

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
[QR25DE]

Wiring Diagram

UBS00JHX
A

EC

C

D

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-1097

BBWA2267E
2006 Sentra

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
[QR25DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

3

R/W

Throttle control motor power supply

[Ignition switch: ON]

BATTERY VOLTAGE (11 - 14V)

0 - 14V

4

P

Throttle control motor (Close)

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully released

5

L

Throttle control motor (Open)

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully depressed

0 - 14V

PBIB0534E

104 P

Throttle control motor relay

[Ignition switch: OFF] [Ignition switch: ON]

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body. Refer to EC-742, "Ground Inspection" .

BATTERY VOLTAGE (11 - 14V)
0 - 1.0V

PBIB0533E

UBS00JHY

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-1098

BBIA0515E
2006 Sentra

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION

2. CHECK THROTTLE CONTROL MOTOR RELAY SIGNAL CIRCUIT

Check voltage between ECM terminal 3 and ground under the following conditions with CONSULT-II or tester.

Ignition switch OFF
ON
OK or NG OK >> GO TO 8. NG >> GO TO 3.

Voltage
Approximately 0V
Battery voltage (11 - 14V)

3. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF. 2. Disconnect throttle control motor relay.

[QR25DE]
A
EC
C
D
MBIB0028E
E
F

G

H

3. Check voltage between throttle control motor relay terminals 2, 5 and ground. Voltage: Battery voltage
OK or NG OK >> GO TO 5. NG >> GO TO 4.
4. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E10, F48 G Fuse and fusible link box connector E23 G 15A fuse G Harness for open or short between throttle control motor relay and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.

BBIA0102E

I

J

K

L
PBIB0575E
M

Revision: December 2006

EC-1099

2006 Sentra

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
[QR25DE]
5. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 3 and throttle control motor relay terminal 3.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 6. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK THROTTLE CONTROL MOTOR RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check continuity between ECM terminal 104 and throttle control motor relay terminal 1. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 7. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK THROTTLE CONTROL MOTOR RELAY

Refer to EC-1101, "Component Inspection" . OK or NG
OK >> GO TO 11. NG >> Replace throttle control motor relay.
8. CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT

1. Turn ignition switch OFF. 2. Disconnect electric throttle control actuator harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between the following terminals.
Refer to Wiring Diagram.

Electric throttle control actuator terminal

ECM terminal

Continuity

4

Should exist

3

5

Should not exist

4

Should not exist

6

5

Should exist

5. Also check harness for short to ground and short to power.
OK or NG OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

BBIA0103E

Revision: December 2006

EC-1100

2006 Sentra

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
9. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Remove the intake air duct. 2. Check if foreign matter is caught between the throttle valve and
the housing. OK or NG
OK >> GO TO 10. NG >> Remove the foreign matter and clean the electric throttle
control actuator inside.

[QR25DE]
A EC
C

D

10. CHECK THROTTLE CONTROL MOTOR
Refer to EC-1101, "Component Inspection" . OK or NG
OK >> GO TO 11. NG >> GO TO 12.
11. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" OK or NG
OK >> GO TO 12. NG >> Repair or replace harness or connectors.
12. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. 2. Perform EC-671, "Throttle Valve Closed Position Learning" . 3. Perform EC-671, "Idle Air Volume Learning" .

>> INSPECTION END
Component Inspection
THROTTLE CONTROL MOTOR RELAY 1. Apply 12V direct current between relay terminals 1 and 2. 2. Check continuity between relay terminals 3 and 5.

Conditions

Continuity

12V direct current supply between terminals 1 and 2

Yes

No current supply

No

3. If NG, replace throttle control motor relay.

BBIA0079E
E F G H I J K L
UBS00JHZ
M

THROTTLE CONTROL MOTOR 1. Disconnect electric throttle control actuator harness connector.

PBIB0098E

Revision: December 2006

EC-1101

2006 Sentra

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION
2. Check resistance between terminals 3 and 6. Resistance: Approximately 1 - 15  [at 25 °C (77°F)]
3. If NG, replace electric throttle control actuator and go to next step.
4. Perform EC-671, "Throttle Valve Closed Position Learning" . 5. Perform EC-671, "Idle Air Volume Learning" .

[QR25DE]

Removal and Installation
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EM-108, "INTAKE MANIFOLD" .

PBIB0095E UBS00JI0

Revision: December 2006

EC-1102

2006 Sentra

DTC P2118 THROTTLE CONTROL MOTOR

[QR25DE]

DTC P2118 THROTTLE CONTROL MOTOR Component Description

PFP:16119
A
UBS00JI7

The throttle control motor is operated by the ECM and it opens and closes the throttle valve. The current opening angle of the throttle valve is detected by the throttle position sensor and it provides feed- EC back to the ECM to control the throttle control motor to make the throttle valve opening angle properly in response to driving condition.

On Board Diagnosis Logic

UBS00JI8

C

This self-diagnosis has the one trip detection logic.

DTC No. Trouble diagnosis name

DTC detecting condition

P2118 2118

Throttle control motor circuit short

ECM detects short in both circuits between ECM and throttle control motor.

Possible cause

D

G Harness or connectors (Throttle control motor circuit is shorted.)

G Electric throttle control actuator

E

(Throttle control motor)

FAIL-SAFE MODE

When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.

F

Engine operating condition in fail-safe mode

ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return G
spring.

DTC Confirmation Procedure

UBS00JI9

NOTE:

H

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

WITH CONSULT-II

I

1. Turn ignition switch ON and wait at least 2 seconds.

2. Select "DATA MONITOR" mode with CONSULT-II.

J

3. Start engine and let it idle for 5 seconds.

4. If DTC is detected, go to EC-1105, "Diagnostic Procedure" .

K

L

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

M

Revision: December 2006

EC-1103

2006 Sentra

DTC P2118 THROTTLE CONTROL MOTOR Wiring Diagram

[QR25DE]
UBS00JIA

Revision: December 2006

EC-1104

BBWA2268E
2006 Sentra

DTC P2118 THROTTLE CONTROL MOTOR

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.
3

WIRE COLOR

ITEM

R/W

Throttle control motor power supply

CONDITION [Ignition switch: ON]

DATA (DC Voltage)
C
BATTERY VOLTAGE (11 - 14V)

0 - 14V

D

[Ignition switch: ON]

4

P

Throttle control motor (Close)

G Engine stopped G Shift lever: D (A/T), 1ST (M/T)

E

G Accelerator pedal: Fully released

5

L

Throttle control motor (Open)

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully depressed

0 - 14V

PBIB0534E

F

G

H

104 P

Throttle control motor relay

[Ignition switch: OFF] [Ignition switch: ON]

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body. Refer to EC-742, "Ground Inspection" .

PBIB0533E

BATTERY VOLTAGE

(11 - 14V)

I

0 - 1.0V

J

UBS00JIB

K

L

M

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-1105

BBIA0515E
2006 Sentra

DTC P2118 THROTTLE CONTROL MOTOR

[QR25DE]

2. CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT

1. Disconnect electric throttle control actuator harness connector.
2. Disconnect ECM harness connector. 3. Check harness continuity between the following terminals.
Refer to Wiring Diagram.

Electric throttle control actuator terminal

ECM terminal

Continuity

4

Should exist

3

5

Should not exist

4

Should not exist

6

5

Should exist

4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

3. CHECK THROTTLE CONTROL MOTOR

BBIA0103E

Refer to EC-1106, "Component Inspection" . OK or NG
OK >> GO TO 4. NG >> GO TO 5.
4. CHECK INTERMITTENT INCIDENT

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . OK or NG
OK >> GO TO 5. NG >> Repair or replace harness or connectors.
5. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1. Replace the electric throttle control actuator. 2. Perform EC-671, "Throttle Valve Closed Position Learning" . 3. Perform EC-671, "Idle Air Volume Learning" .

>> INSPECTION END
Component Inspection
THROTTLE CONTROL MOTOR 1. Disconnect electric throttle control actuator harness connector. 2. Check resistance between terminals 3 and 6.
Resistance: Approximately 1 - 15  [at 25 °C (77°F)]
3. If NG, replace electric throttle control actuator and go to next step.
4. Perform EC-671, "Throttle Valve Closed Position Learning" . 5. Perform EC-671, "Idle Air Volume Learning" .

UBS00JIC

Revision: December 2006

EC-1106

PBIB0095E
2006 Sentra

DTC P2118 THROTTLE CONTROL MOTOR
Removal and Installation
ELECTRIC THROTTLE CONTROL ACTUATOR Refer to EM-108, "INTAKE MANIFOLD" .

[QR25DE]
UBS00JID
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1107

2006 Sentra

DTC P2119 ELECTRIC THROTTLE CONTROL ACTUATOR
[QR25DE]

DTC P2119 ELECTRIC THROTTLE CONTROL ACTUATOR

PFP:16119

Component Description

UBS00JHQ

Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle control motor is operated by the ECM and it opens and closes the throttle valve. The throttle position sensor detects the throttle valve position, and the opening and closing speed of the throttle valve and feeds the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.

On Board Diagnosis Logic

UBS00JHR

This self-diagnosis has the one trip detection logic.

DTC No. Trouble diagnosis name

P2119 2119

A)

Electric throttle control

actuator

B)

C)

DTC detecting condition

Possible cause

Electric throttle control actuator does not function properly due to the return spring malfunction.
Throttle valve opening angle in fail-safe mode is not in specified range.

G Electric throttle control actuator

ECM detects the throttle valve is stuck open.

FAIL-SAFE MODE When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.

Detected items

Engine operating condition in fail-safe mode

Malfunction A

ECM controls the electric throttle actuator by regulating the throttle opening around the idle position. The engine speed will not rise more than 2,000 rpm.

Malfunction B

ECM controls the electric throttle control actuator by regulating the throttle opening to 20 degrees or less.

Malfunction C

While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops, the engine stalls. The engine can restart in N or P position, and engine speed will not exceed 1,000 rpm or more.

DTC Confirmation Procedure

UBS00JHS

NOTE: G Perform PROCEDURE FOR MALFUNCTION A AND B first. If the DTC cannot be confirmed, perform
PROCEDURE FOR MALFUNCTION C.
G If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

PROCEDURE FOR MALFUNCTION A AND B With CONSULT-II
1. Turn ignition switch ON and wait at least 1 second. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Shift shift lever to D position (A/T) or 1st position (M/T), and wait
at least 3 seconds. 4. Shift shift lever to P position (A/T) or Neutral position (M/T). 5. Turn ignition switch OFF and wait at least 10 seconds. 6. Turn ignition switch ON and wait at least 1 second. 7. Shift shift lever to D position (A/T) or 1st position (M/T), and wait
at least 3 seconds. 8. Shift shift lever to P position (A/T) or Neutral position (M/T). 9. Turn ignition switch OFF, wait at least 10 seconds, and then turn
ON. 10. If DTC is detected, go to EC-1109, "Diagnostic Procedure" .

SEF058Y

With GST Follow the procedure "With CONSULT-II" above.

Revision: December 2006

EC-1108

2006 Sentra

DTC P2119 ELECTRIC THROTTLE CONTROL ACTUATOR
[QR25DE]

PROCEDURE FOR MALFUNCTION C

With CONSULT-II

A

1. Turn ignition switch ON and wait at least 1 second.

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Shift shift lever to D position (A/T) or 1st position (M/T) and wait

EC

at least 3 seconds.

4. Shift shift lever to P position (A/T) or Neutral (M/T) position.

5. Start engine and let it idle for 3 seconds.

C

6. If DTC is detected, go to EC-1109, "Diagnostic Procedure" .

D

With GST Follow the procedure "With CONSULT-II" above.
Diagnostic Procedure
1. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Remove the intake air duct. 2. Check if a foreign matter is caught between the throttle valve
and the housing. OK or NG
OK >> GO TO 2. NG >> Remove the foreign matter and clean the electric throttle
control actuator inside.

SEF058Y
E F
UBS00JHT
G H I

2. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. 2. Perform EC-671, "Throttle Valve Closed Position Learning" . 3. Perform EC-671, "Idle Air Volume Learning" .
>> INSPECTION END

J
BBIA0079E
K
L
M

Revision: December 2006

EC-1109

2006 Sentra

DTC P2122, P2123 APP SENSOR

[QR25DE]

DTC P2122, P2123 APP SENSOR

PFP:18002

Component Description

UBS00JMG

The accelerator pedal position sensor is installed on the upper end

of the accelerator pedal assembly. The sensor detects the accelera-

tor position and sends a signal to the ECM.

Accelerator pedal position sensor has two sensors. These sensors

are a kind of potentiometers which transform the accelerator pedal

position into output voltage, and emit the voltage signal to the ECM.

In addition, these sensors detect the opening and closing speed of

the accelerator pedal and feed the voltage signals to the ECM. The

ECM judges the current opening angle of the accelerator pedal from

these signals and controls the throttle control motor based on these

signals. Idle position of the accelerator pedal is determined by the ECM

PBIB1741E

receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for the engine oper-

ation such as fuel cut.

CONSULT-II Reference Value in Data Monitor Mode

UBS00JMH

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

ACCEL SEN 1

G Ignition switch: ON (Engine stopped)
G Shift lever: D (A/T), 1ST (M/T)

Accelerator pedal: Fully released Accelerator pedal: Fully depressed

0.65 - 0.87V More than 4.3V

ACCEL SEN 2*

G Ignition switch: ON (Engine stopped)
G Shift lever: D (A/T), 1ST (M/T)

Accelerator pedal: Fully released Accelerator pedal: Fully depressed

0.56 - 0.96V More than 4.0V

CLSD THL POS

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released

ON

Accelerator pedal: Slightly depressed OFF

*: Accelerator pedal position sensor 2 signal is converted by ECM internally. Thus, it differ from ECM terminals voltage signal.

On Board Diagnosis Logic

UBS00JMI

These self-diagnoses have the one trip detection logic.
NOTE: If DTC P2122 or P2123 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to EC-1033, "DTC P0643 SENSOR POWER SUPPLY" .

DTC No.
P2122 2122
P2123 2123

Trouble diagnosis name

DTC detecting condition

Possible cause

Accelerator pedal position sensor 1 circuit low input
Accelerator pedal position sensor 1 circuit high input

An excessively low voltage from the APP sensor 1 is sent to ECM.
An excessively high voltage from the APP sensor 1 is sent to ECM.

G Harness or connectors (The APP sensor 1 circuit is open or shorted.)
G Accelerator pedal position sensor (Accelerator pedal position sensor 1)

FAIL-SAFE MODE When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
Engine operating condition in fail-safe mode
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. So, the acceleration will be poor.

Revision: December 2006

EC-1110

2006 Sentra

DTC P2122, P2123 APP SENSOR

[QR25DE]

DTC Confirmation Procedure

UBS00JMJ

NOTE:

A

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

EC

Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II

1. Turn ignition switch ON.

C

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Start engine and let it idle for 1 second.

D

4. If DTC is detected, go to EC-1113, "Diagnostic Procedure" .

E

WITH GST Follow the procedure "WITH CONSULT-II" above.

F
SEF058Y
G
H

I

J

K

L

M

Revision: December 2006

EC-1111

2006 Sentra

Wiring Diagram

DTC P2122, P2123 APP SENSOR

[QR25DE]
UBS00JMK

Revision: December 2006

EC-1112

BBWA2264E
2006 Sentra

DTC P2122, P2123 APP SENSOR

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

Sensor ground

[Engine is running]

C

82 B/Y

(Accelerator pedal position G Warm-up condition

Approximately 0V

sensor 1)

G Idle speed

Sensor ground

[Engine is running]

D

83 G

(Accelerator pedal position G Warm-up condition

Approximately 0V

sensor 2)

G Idle speed

Sensor power supply

E

90 R

(Accelerator pedal position [Ignition switch: ON]

Approximately 5V

sensor 1)

91 R/Y

Sensor power supply (Accelerator pedal position sensor 2)

[Ignition switch: ON]

F
Approximately 5V

98 R/B

Accelerator pedal position sensor 2

106 W

Accelerator pedal position sensor 1

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully released
[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully depressed
[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully released
[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully depressed

1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body. Refer to EC-742, "Ground Inspection" .

0.28 - 0.48V More than 2.0V 0.65 - 0.87V More than 4.3V

G H I J K
UBS00JML
L M

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-1113

BBIA0515E
2006 Sentra

DTC P2122, P2123 APP SENSOR
2. CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.

[QR25DE]

3. Check voltage between APP sensor terminal 2 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 4. NG >> GO TO 3.

BBIA0104E

3. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK APP SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between APP sensor terminal 4 and ECM terminal 82.
Refer to Wiring Diagram.
Continuity should exist. 4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 6. NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB0811E

Revision: December 2006

EC-1114

2006 Sentra

DTC P2122, P2123 APP SENSOR
6. CHECK APP SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 106 and APP sensor terminal 3. Refer to Wiring Diagram. Continuity should exist.
2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 8. NG >> GO TO 7.
7. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK APP SENSOR
Refer to EC-1115, "Component Inspection" . OK or NG
OK >> GO TO 10. NG >> GO TO 9.
9. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. 2. Perform EC-670, "Accelerator Pedal Released Position Learning" . 3. Perform EC-671, "Throttle Valve Closed Position Learning" . 4. Perform EC-671, "Idle Air Volume Learning" .
>> INSPECTION END
10. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

[QR25DE]
A EC
C D E F G H I J K L

>> INSPECTION END
Component Inspection
ACCELERATOR PEDAL POSITION SENSOR 1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Check voltage between ECM terminals 106 (APP sensor 1 signal), 98 (APP sensor 2 signal) and ground under the following conditions.

Terminal
106 (Accelerator pedal position sensor 1)
98 (Accelerator pedal position sensor 2)

Accelerator pedal Fully released Fully depressed Fully released Fully depressed

Voltage 0.65 - 0.87V More than 4.3V 0.28 - 0.48V More than 2.0V

M
UBS00JMM
MBIB0023E

Revision: December 2006

EC-1115

2006 Sentra

DTC P2122, P2123 APP SENSOR
4. If NG, replace accelerator pedal assembly and go to the next step. 5. Perform EC-670, "Accelerator Pedal Released Position Learning" . 6. Perform EC-671, "Throttle Valve Closed Position Learning" . 7. Perform EC-671, "Idle Air Volume Learning" .
Removal and Installation
ACCELERATOR PEDAL Refer to ACC-2, "ACCELERATOR CONTROL SYSTEM" .

[QR25DE]
UBS00JMN

Revision: December 2006

EC-1116

2006 Sentra

DTC P2127, P2128 APP SENSOR

[QR25DE]

DTC P2127, P2128 APP SENSOR Component Description

PFP:18002
A
UBS00JMO

The accelerator pedal position sensor is installed on the upper end

of the accelerator pedal assembly. The sensor detects the accelera-

EC

tor position and sends a signal to the ECM.

Accelerator pedal position sensor has two sensors. These sensors

are a kind of potentiometers which transform the accelerator pedal

position into output voltage, and emit the voltage signal to the ECM.

C

In addition, these sensors detect the opening and closing speed of

the accelerator pedal and feed the voltage signals to the ECM. The

ECM judges the current opening angle of the accelerator pedal from

D

these signals and controls the throttle control motor based on these

signals.

Idle position of the accelerator pedal is determined by the ECM

PBIB1741E

receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for the engine oper-

E

ation such as fuel cut.

CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.

UBS00JMP

F

MONITOR ITEM

CONDITION

SPECIFICATION

G

G Ignition switch: ON

Accelerator pedal: Fully released

0.65 - 0.87V

ACCEL SEN 1

(Engine stopped)

G Shift lever: D (A/T), 1ST (M/T)

Accelerator pedal: Fully depressed

More than 4.3V

H

G Ignition switch: ON

Accelerator pedal: Fully released

0.56 - 0.96V

ACCEL SEN 2*

(Engine stopped) G Shift lever: D (A/T), 1ST (M/T)

Accelerator pedal: Fully depressed

More than 4.0V

CLSD THL POS

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released

ON

Accelerator pedal: Slightly depressed OFF

I

*: Accelerator pedal position sensor 2 signal is converted by ECM internally. Thus, it differ from ECM terminals voltage signal.

J

On Board Diagnosis Logic

UBS00JMQ

These self-diagnoses have the one trip detection logic.

DTC No. Trouble diagnosis name

DTC detecting condition

K
Possible cause

P2127 2127

Accelerator pedal position sensor 2 circuit low input

An excessively low voltage from the APP sensor 2 is sent to ECM.

G Harness or connectors (The APP sensor 2 circuit is open or shorted.)

L

(TP sensor circuit is shorted.)

P2128 2128

Accelerator pedal position sensor 2 circuit high input

An excessively high voltage from the APP sensor 2 is sent to ECM.

G Accelerator pedal position sensor (Accelerator pedal position sensor 2)
G Electric throttle control actuator

M

(TP sensor 1 and 2)

FAIL-SAFE MODE When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
Engine operating condition in fail-safe mode
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. So, the acceleration will be poor.

Revision: December 2006

EC-1117

2006 Sentra

DTC P2127, P2128 APP SENSOR

[QR25DE]

DTC Confirmation Procedure

UBS00JMR

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for 1 second. 4. If DTC is detected, go to EC-1120, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-1118

2006 Sentra

Wiring Diagram

DTC P2127, P2128 APP SENSOR

[QR25DE]
UBS00JMS
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1119

BBWA2175E
2006 Sentra

DTC P2127, P2128 APP SENSOR

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

47 B

Sensor power supply (Throttle position sensor)

[Ignition switch: ON]

Approximately 5V

82 B/Y

Sensor ground (Accelerator pedal position sensor 1)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

83 G

Sensor ground (Accelerator pedal position sensor 2)

[Engine is running] G Warm-up condition G Idle speed

Approximately 0V

90 R

Sensor power supply (Accelerator pedal position sensor 1)

[Ignition switch: ON]

Approximately 5V

91 R/Y

Sensor power supply (Accelerator pedal position sensor 2)

[Ignition switch: ON]

Approximately 5V

98 R/B

Accelerator pedal position sensor 2

[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully depressed

0.28 - 0.48V More than 2.0V

106 W

Accelerator pedal position sensor 1

[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully released
[Ignition switch: ON] G Engine stopped G Accelerator pedal: Fully depressed

0.65 - 0.87V More than 4.3V

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS00JMT

1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body. Refer to EC-742, "Ground Inspection" .

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-1120

BBIA0515E
2006 Sentra

DTC P2127, P2128 APP SENSOR
2. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.

[QR25DE]
A EC

C

3. Check voltage between APP sensor terminal 1 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 8. NG >> GO TO 3.

D
BBIA0104E
E
F
G

3. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between APP sensor terminal 1 and ECM terminal 91.
Refer to Wiring Diagram.
Continuity should exist.
OK or NG OK >> GO TO 5. NG >> GO TO 4.
4. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open between ECM and accelerator pedal position sensor

>> Repair or replace open circuit.
5. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III

Check harness for short to power and short to ground, between the following terminals.

ECM terminal

Sensor terminal

Reference Wiring Diagram

91

APP sensor terminal 1

EC-1119

47

Electric throttle control actuator terminal 1

EC-1127

OK or NG
OK >> GO TO 6. NG >> Repair short to ground or short to power in harness or connectors.

PBIB0812E

H

I

J

K

L

M

Revision: December 2006

EC-1121

2006 Sentra

DTC P2127, P2128 APP SENSOR
6. CHECK THROTTLE POSITION SENSOR
Refer to EC-1131, "Component Inspection" . OK or NG
OK >> GO TO 14. NG >> GO TO 7.
7. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. 2. Perform EC-671, "Throttle Valve Closed Position Learning" . 3. Perform EC-671, "Idle Air Volume Learning" .

[QR25DE]

>> INSPECTION END
8. CHECK APP SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between APP sensor terminal 5 and ECM terminal 83.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 10. NG >> GO TO 9.
9. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and accelerator pedal position sensor

>> Repair open circuit or short to ground or short to power in harness or connectors.
10. CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 98 and APP sensor terminal 6. Refer to Wiring Diagram.
Continuity should exist. 2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 12. NG >> GO TO 11.
11. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and accelerator pedal position sensor

>> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-1122

2006 Sentra

DTC P2127, P2128 APP SENSOR
12. CHECK APP SENSOR
Refer to EC-1124, "Component Inspection" . OK or NG
OK >> GO TO 14. NG >> GO TO 13.
13. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. 2. Perform EC-670, "Accelerator Pedal Released Position Learning" . 3. Perform EC-671, "Throttle Valve Closed Position Learning" . 4. Perform EC-671, "Idle Air Volume Learning" .
>> INSPECTION END
14. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END

[QR25DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1123

2006 Sentra

DTC P2127, P2128 APP SENSOR

Component Inspection
ACCELERATOR PEDAL POSITION SENSOR 1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Check voltage between ECM terminals 106 (APP sensor 1 signal), 98 (APP sensor 2 signal) and ground under the following conditions.

Terminal

Accelerator pedal

Voltage

106 (Accelerator pedal position sensor 1)

Fully released Fully depressed

0.65 - 0.87V More than 4.3V

98 (Accelerator pedal position sensor 2)

Fully released Fully depressed

0.28 - 0.48V More than 2.0V

4. If NG, replace accelerator pedal assembly and go to the next step.
5. Perform EC-670, "Accelerator Pedal Released Position Learning" . 6. Perform EC-671, "Throttle Valve Closed Position Learning" . 7. Perform EC-671, "Idle Air Volume Learning" .

Removal and Installation
ACCELERATOR PEDAL
Refer to ACC-2, "ACCELERATOR CONTROL SYSTEM" .

[QR25DE]
UBS00JMU
MBIB0023E UBS00JMV

Revision: December 2006

EC-1124

2006 Sentra

DTC P2135 TP SENSOR

[QR25DE]

DTC P2135 TP SENSOR Component Description

PFP:16119
A
UBS00JMW

Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement. The throttle position sensor has two sensors. These sensors are a kind of potentiometers which transform the throttle valve position into output voltage, and emit the voltage signal to the ECM. In addition, these sensors detect the opening and closing speed of the throttle valve and feed the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.
CONSULT-II Reference Value in Data Monitor Mode

EC
C
D
PBIB0145E
E
UBS00JMX

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

F

THRTL SEN1

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released

More than 0.36V

THRTL SEN2*

G Shift lever: D (A/T), 1ST (M/T) Accelerator pedal: Fully depressed Less than 4.75V

G

*:Throttle position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminals voltage signal.

On Board Diagnosis Logic
This self-diagnosis has the one trip detection logic.

UBS00JMY

H

DTC No. Trouble diagnosis name

DTC detecting condition

Possible cause

I

G Harness or connector (The TP sensor 1 and 2 circuit is open or

P2135 2135

Throttle position sensor circuit range/performance

Rationally incorrect voltage is sent to ECM compared with the signals from TP sensor 1 and TP sensor 2.

shorted.) (APP sensor 2 circuit is shorted.)
G Electric throttle control actuator

J

(TP sensor 1 and 2)

G Accelerator pedal position sensor

K

FAIL-SAFE MODE

When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

L

Engine operation condition in fail-safe mode

The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10

M

degrees.

The ECM regulates the opening speed of the throttle valve to be slower than the normal condition.

So, the acceleration will be poor.

Revision: December 2006

EC-1125

2006 Sentra

DTC P2135 TP SENSOR

[QR25DE]

DTC Confirmation Procedure

UBS00JMZ

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II 1. Turn ignition switch ON. 2. Select "DATA MONITOR" mode with CONSULT-II. 3. Start engine and let it idle for 1 second. 4. If DTC is detected, go to EC-1128, "Diagnostic Procedure" .

WITH GST Follow the procedure "WITH CONSULT-II" above.

SEF058Y

Revision: December 2006

EC-1126

2006 Sentra

Wiring Diagram

DTC P2135 TP SENSOR

[QR25DE]
UBS00JN0
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1127

BBWA2155E
2006 Sentra

DTC P2135 TP SENSOR

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

47 B

Sensor power supply (Throttle position sensor)

[Ignition switch: ON]

Approximately 5V

50 W 66 R 69 G 91 R/Y

Throttle position sensor 1
Sensor ground (Throttle position sensor)
Throttle position sensor 2
Sensor power supply (Accelerator pedal position sensor 2)

[Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully depressed [Engine is running] G Warm-up condition G Idle speed [Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully released [Ignition switch: ON] G Engine stopped G Shift lever: D (A/T), 1ST (M/T) G Accelerator pedal: Fully depressed
[Ignition switch: ON]

More than 0.36V Less than 4.75V Approximately 0V Less than 4.75V More than 0.36V Approximately 5V

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS00JN1

1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body. Refer to EC-742, "Ground Inspection" .

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-1128

BBIA0515E
2006 Sentra

DTC P2135 TP SENSOR
2. CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT-I
1. Disconnect electric throttle control actuator harness connector. 2. Turn ignition switch ON.

[QR25DE]
A EC

C

3. Check voltage between electric throttle control actuator terminal 1 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 7. NG >> GO TO 3.

D
BBIA0103E
E
F
G

3. CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT-II

PBIB0082E

H

1. Turn ignition switch OFF.

I

2. Disconnect ECM harness connector.

3. Check harness continuity between electric throttle control actuator terminal 1 and ECM terminal 47.

Refer to Wiring Diagram.

J

Continuity should exist.

OK or NG

K

OK >> GO TO 4.

NG >> Repair or replace open circuit.

4. CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT-III

L

Check harness for short to power and short to ground, between the following terminals. M

ECM terminal

Sensor terminal

Reference Wiring Diagram

47

Electric throttle control actuator terminal 1

EC-1127

91

APP sensor terminal 1

EC-1119

OK or NG
OK >> GO TO 5. NG >> Repair short to ground or short to power in harness or connectors.

5. CHECK APP SENSOR

Refer to EC-1124, "Component Inspection" .
OK or NG OK >> GO TO 11. NG >> GO TO 6.

Revision: December 2006

EC-1129

2006 Sentra

DTC P2135 TP SENSOR
6. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. 2. Perform EC-670, "Accelerator Pedal Released Position Learning" . 3. Perform EC-671, "Throttle Valve Closed Position Learning" . 4. Perform EC-671, "Idle Air Volume Learning" .

[QR25DE]

>> INSPECTION END
7. CHECK THROTTLE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between electric throttle control actuator terminal 5 and ECM terminal 66.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 8. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK THROTTLE POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between the following; ECM terminal 50 and electric throttle control actuator terminal 4, ECM terminal 69 and electric throttle control actuator terminal 2. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK THROTTLE POSITION SENSOR
Refer to EC-1131, "Component Inspection" . OK or NG
OK >> GO TO 11. NG >> GO TO 10.
10. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. 2. Perform EC-671, "Throttle Valve Closed Position Learning" . 3. Perform EC-671, "Idle Air Volume Learning" .

>> INSPECTION END
11. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

Revision: December 2006

EC-1130

2006 Sentra

DTC P2135 TP SENSOR

Component Inspection
THROTTLE POSITION SENSOR 1. Reconnect all harness connectors disconnected.
2. Perform EC-671, "Throttle Valve Closed Position Learning" .
3. Turn ignition switch ON.
4. Set shift lever to D position (A/T models) or 1st position (M/T models).
5. Check voltage between ECM terminals 50 (TP sensor 1), 69 (TP sensor 2) and ground under the following conditions.

Terminal

Accelerator pedal

Voltage

50 (Throttle position sensor 1)

Fully released Fully depressed

More than 0.36V Less than 4.75V

69 (Throttle position sensor 2)

Fully released Fully depressed

Less than 4.75V More than 0.36V

6. If NG, replace electric throttle control actuator and go to the next step.
7. Perform EC-671, "Throttle Valve Closed Position Learning" . 8. Perform EC-671, "Idle Air Volume Learning" .

Removal and Installation
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EM-108, "INTAKE MANIFOLD" .

[QR25DE]
UBS00JN2
A

EC

C

D

E

PBIB1060E

F

G
UBS00JN3
H

I

J

K

L

M

Revision: December 2006

EC-1131

2006 Sentra

DTC P2138 APP SENSOR

[QR25DE]

DTC P2138 APP SENSOR

PFP:18002

Component Description

UBS00JN4

The accelerator pedal position sensor is installed on the upper end

of the accelerator pedal assembly. The sensor detects the accelera-

tor position and sends a signal to the ECM.

Accelerator pedal position sensor has two sensors. These sensors

are a kind of potentiometers which transform the accelerator pedal

position into output voltage, and emit the voltage signal to the ECM.

In addition, these sensors detect the opening and closing speed of

the accelerator pedal and feed the voltage signals to the ECM. The

ECM judges the current opening angle of the accelerator pedal from

these signals and controls the throttle control motor based on these

signals. Idle position of the accelerator pedal is determined by the ECM

PBIB1741E

receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for the engine oper-

ation such as fuel cut.

CONSULT-II Reference Value in Data Monitor Mode

UBS00JN5

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

ACCEL SEN 1

G Ignition switch: ON (Engine stopped)
G Shift lever: D (A/T), 1ST (M/T)

Accelerator pedal: Fully released Accelerator pedal: Fully depressed

0.65 - 0.87V More than 4.3V

ACCEL SEN 2*

G Ignition switch: ON (Engine stopped)
G Shift lever: D (A/T), 1ST (M/T)

Accelerator pedal: Fully released Accelerator pedal: Fully depressed

0.56 - 0.96V More than 4.0V

CLSD THL POS

G Ignition switch: ON (Engine stopped)

Accelerator pedal: Fully released

ON

Accelerator pedal: Slightly depressed OFF

*: Accelerator pedal position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminals voltage signal.

On Board Diagnosis Logic

UBS00JN6

This self-diagnosis has the one trip detection logic.
NOTE: If DTC P2138 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to EC-1033, "DTC P0643 SENSOR POWER SUPPLY" .

DTC No.
P2138 2138

Trouble diagnosis name

DTC detecting condition

Accelerator pedal position sensor circuit range/performance

Rationally incorrect voltage is sent to ECM compared with the signals from APP sensor 1 and APP sensor 2.

Possible cause
G Harness or connector (The APP sensor 1 and 2 circuit is open or shorted.) (TP sensor circuit is shorted.)
G Accelerator pedal position sensor 1 and 2
G Electric throttle control actuator (TP sensor 1 and 2)

FAIL-SAFE MODE When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
Engine operating condition in fail-safe mode
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. So, the acceleration will be poor.

Revision: December 2006

EC-1132

2006 Sentra

DTC P2138 APP SENSOR

[QR25DE]

DTC Confirmation Procedure

UBS00JN7

NOTE:

A

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

EC

Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II

1. Turn ignition switch ON.

C

2. Select "DATA MONITOR" mode with CONSULT-II.

3. Start engine and let it idle for 1 second.

D

4. If DTC is detected, go to EC-1135, "Diagnostic Procedure" .

E

WITH GST Follow the procedure "WITH CONSULT-II" above.

F
SEF058Y
G
H

I

J

K

L

M

Revision: December 2006

EC-1133

2006 Sentra

Wiring Diagram

DTC P2138 APP SENSOR

[QR25DE]
UBS00JN8

Revision: December 2006

EC-1134

BBWA1401E
2006 Sentra

DTC P2138 APP SENSOR

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

47 B

Sensor power supply (Throttle position sensor)

[Ignition switch: ON]

Approximately 5V

C

Sensor ground

[Engine is running]

82 B/Y

(Accelerator pedal position G Warm-up condition

Approximately 0V

D

sensor 1)

G Idle speed

Sensor ground

[Engine is running]

83 G

(Accelerator pedal position G Warm-up condition

Approximately 0V

E

sensor 2)

G Idle speed

90 R

Sensor power supply (Accelerator pedal position sensor 1)

[Ignition switch: ON]

Approximately 5V

F

91 R/Y

Sensor power supply (Accelerator pedal position sensor 2)

[Ignition switch: ON]

Approximately 5V

G

[Ignition switch: ON]

G Engine stopped

0.28 - 0.48V

H

98 R/B

Accelerator pedal position sensor 2

G Accelerator pedal: Fully released [Ignition switch: ON]

G Engine stopped

More than 2.0V

I

G Accelerator pedal: Fully depressed

[Ignition switch: ON]

G Engine stopped

0.65 - 0.87V

J

106 W

Accelerator pedal position sensor 1

G Accelerator pedal: Fully released [Ignition switch: ON]

G Engine stopped

More than 4.3V

K

G Accelerator pedal: Fully depressed

Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

UBS00JN9

L

1. Turn ignition switch OFF.

M

2. Loosen and retighten engine two screws on the body.

Refer to EC-742, "Ground Inspection" .

OK or NG
OK >> GO TO 2. NG >> Repair or replace ground connections.

Revision: December 2006

EC-1135

BBIA0515E
2006 Sentra

DTC P2138 APP SENSOR
2. CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.

[QR25DE]

3. Check voltage between APP sensor terminal 2 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 4. NG >> GO TO 3.

BBIA0104E

3. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
Check voltage between APP sensor terminal 1 and ground with CONSULT-II or tester.
Voltage: Approximately 5V OK or NG
OK >> GO TO 10. NG >> GO TO 5.

PBIB0811E

PBIB2039E

Revision: December 2006

EC-1136

2006 Sentra

DTC P2138 APP SENSOR
5. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between APP sensor terminal 1 and ECM terminal 91.
Refer to Wiring Diagram.
Continuity should exist. OK or NG
OK >> GO TO 7. NG >> GO TO 6.
6. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open between ECM and accelerator pedal position sensor

[QR25DE]
A EC
C D E F

>> Repair or replace open circuit.

7. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III

G

Check harness for short to power and short to ground, between the following terminals.

ECM terminal

Sensor terminal

H
Reference Wiring Diagram

91

APP sensor terminal 1

EC-1134

47

Electric throttle control actuator terminal 1

EC-1127

I

OK or NG

OK >> GO TO 8.

NG >> Repair short to ground or short to power in harness or connectors.

J

8. CHECK THROTTLE POSITION SENSOR

Refer to EC-1131, "Component Inspection" .

K

OK or NG

OK >> GO TO 16.

L

NG >> GO TO 9.

9. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR M 1. Replace the electric throttle control actuator.
2. Perform EC-671, "Throttle Valve Closed Position Learning" . 3. Perform EC-671, "Idle Air Volume Learning" .

>> INSPECTION END

Revision: December 2006

EC-1137

2006 Sentra

DTC P2138 APP SENSOR
10. CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between the following;
APP sensor terminal 4 and ECM terminal 82, APP sensor terminal 5 and ECM terminal 83. Refer to Wiring Diagram.
Continuity should exist. 4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 12. NG >> GO TO 11.
11. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and accelerator pedal position sensor

[QR25DE]

>> Repair open circuit or short to ground or short to power in harness or connectors.
12. CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between the following; ECM terminal 106 and APP sensor terminal 3, ECM terminal 98 and APP sensor terminal 6. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 14. NG >> GO TO 13.
13. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and accelerator pedal position sensor

>> Repair open circuit or short to ground or short to power in harness or connectors.
14. CHECK APP SENSOR
Refer to EC-1139, "Component Inspection" . OK or NG
OK >> GO TO 16. NG >> GO TO 15.

Revision: December 2006

EC-1138

2006 Sentra

DTC P2138 APP SENSOR

15. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. 2. Perform EC-670, "Accelerator Pedal Released Position Learning" . 3. Perform EC-671, "Throttle Valve Closed Position Learning" . 4. Perform EC-671, "Idle Air Volume Learning" .

>> INSPECTION END
16. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
ACCELERATOR PEDAL POSITION SENSOR 1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Check voltage between ECM terminals 106 (APP sensor 1 signal), 98 (APP sensor 2 signal) and ground under the following conditions.

Terminal

Accelerator pedal

Voltage

106 (Accelerator pedal position sensor 1)

Fully released Fully depressed

0.65 - 0.87V More than 4.3V

98 (Accelerator pedal position sensor 2)

Fully released Fully depressed

0.28 - 0.48V More than 2.0V

4. If NG, replace accelerator pedal assembly and go to the next step.
5. Perform EC-670, "Accelerator Pedal Released Position Learning" . 6. Perform EC-671, "Throttle Valve Closed Position Learning" . 7. Perform EC-671, "Idle Air Volume Learning" .

Removal and Installation
ACCELERATOR PEDAL
Refer to ACC-2, "ACCELERATOR CONTROL SYSTEM" .

[QR25DE]
A

EC

C

D

E
UBS00JNA
F

G

H

I

MBIB0023E

J

K

L
UBS00JNB
M

Revision: December 2006

EC-1139

2006 Sentra

DTC P2A00 A/F SENSOR 1
DTC P2A00 A/F SENSOR 1
Component Description
The A/F sensor 1 is a planar dual-cell limit current sensor. The sensor element of the A/F sensor 1 is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element. The sensor is capable of precise measurement = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide range (0.7 <
< air). The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygenpump cell so that the composition of the exhaust gas in the diffusion gap remains constant at = 1. Therefore, the A/F sensor 1 is able to indicate air-fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800°C (1,292 - 1,472°F).

[QR25DE]
PFP:22693
UBS00JJX
SEF579Z

CONSULT-II Reference Value in Data Monitor Mode

SEF580Z UBS00JJY

Specification data are reference values.

MONITOR ITEM A/F SEN1 (B1)

CONDITION

G Engine: After warming up

Maintaining engine speed at 2,000 rpm

SPECIFICATION Fluctuates around 1.5V

On Board Diagnosis Logic

UBS00JJZ

To judge the malfunction, the A/F signal computed by ECM from the A/F sensor 1 signal is monitored not to be shifted to LEAN side or RICH side.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P2A00 2A00

Air fuel ratio (A/F) sensor 1 circuit range/performance

G The output voltage computed by ECM from the A/F sensor 1 signal is shifted to the lean side for a specified period.
G The A/F signal computed by ECM from the A/F sensor 1 signal is shifted to the rich side for a specified period.

G A/F sensor 1 G A/F sensor 1 heater G Fuel pressure G Fuel injector G Intake air leaks

Revision: December 2006

EC-1140

2006 Sentra

DTC P2A00 A/F SENSOR 1

[QR25DE]

DTC Confirmation Procedure

UBS00JK0

NOTE:

A

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

TESTING CONDITION:

EC

Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

WITH CONSULT-II
C 1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Turn ignition switch ON and select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CON- D SULT-II.

4. Clear the self-learning coefficient by touching "CLEAR".

5. Turn ignition switch OFF and wait at least 10 seconds.

E

6. Start engine and keep the engine speed between 3,500 and 4,000 rpm for 1 minute under no load.

7. Let engine idle for 1 minute.

F

8. Keep engine speed between 2,500 and 3,000 rpm for 20 min-

utes.

9. If 1st trip DTC is detected, go to EC-1143, "Diagnostic Proce-

G

dure" .

WITH GST

PBIB2035E
H

1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds. 3. Disconnect mass air flow sensor harness connector. 4. Start engine and let it idle for at least 5 seconds.
5. Stop engine and reconnect mass air flow sensor harness connector.
6. Select Service $03 with GST and make sure that DTC P0102 is detected.
7. Select Service $04 with GST and erase the DTC P0102. 8. Start engine and keep the engine speed between 3,500 and
4,000 rpm for 1 minute under no load. 9. Let engine idle for 1 minute.
10. Keep engine speed between 2,500 and 3,000 rpm for 20 minutes.
11. Select Service $07 with GST. If 1st trip DTC is detected, go to EC-1143, "Diagnostic Procedure" .

I
J
K
L
BBIA0130E
M

Revision: December 2006

EC-1141

2006 Sentra

Wiring Diagram

DTC P2A00 A/F SENSOR 1

[QR25DE]
UBS00JK1

Revision: December 2006

EC-1142

BBWA1478E
2006 Sentra

DTC P2A00 A/F SENSOR 1

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT-II.

A

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

EC

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)
C

Approximately 5V

2

R

A/F sensor 1 heater

[Engine is running] G Warm-up condition G Idle speed

16 OR/L

35 B/Y 56 OR

A/F sensor 1

75 W/L

[Engine is running] G Warm-up condition G Idle speed

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
1. CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.
2. Loosen and retighten engine two screws on the body. Refer to EC-742, "Ground Inspection" .

D

E

PBIB1584E

Approximately 3.1V

Approximately 2.6V

F

2 - 3V

2 - 3V

G

UBS00JK2

H

I

J

K

OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections.
2. RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1
Loosen and retighten the air fuel ratio (A/F) sensor 1. Tightening torque: 40 - 60 N-m (4.1 - 6.1 kg-m, 30 - 44 ft-lb)
>> GO TO 3.

L

BBIA0515E

M

Revision: December 2006

EC-1143

BBIA0304E
2006 Sentra

DTC P2A00 A/F SENSOR 1
3. CHECK FOR INTAKE AIR LEAK
1. Start engine and run it at idle. 2. Listen for an intake air leak after the mass air flow sensor. OK or NG
OK >> GO TO 4. NG >> Repair or replace.
4. CLEAR THE SELF-LEARNING DATA.
With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT-II. 3. Clear the self-learning control coefficient by touching "CLEAR". 4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?

[QR25DE]

SEF215Z

Without CONSULT-II

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF.

3. Disconnect mass air flow sensor harness connector, and restart and run engine for at least 5 seconds at idle speed.

4. Stop engine and reconnect mass air flow sensor harness connector.

5. Make sure DTC P0102 is displayed.

6. Erase the DTC memory. Refer to EC-653, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" .

7. Make sure DTC P0000 is displayed.

8. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?

BBIA0304E

Yes or No

Yes >> Perform trouble diagnosis for DTC P0171 or P0172. Refer to EC-867, "DTC P0171 FUEL INJECTION SYSTEM FUNCTION" or EC-875, "DTC P0172 FUEL INJECTION SYSTEM FUNCTION" .
No >> GO TO 5.

Revision: December 2006

EC-1144

2006 Sentra

DTC P2A00 A/F SENSOR 1
5. CHECK HARNESS CONNECTOR
1. Turn ignition switch OFF. 2. Disconnect A/F sensor 1 harness connector. 3. Check harness connector for water.
Water should not exit. OK or NG
OK >> GO TO 6. NG >> Repair or replace harness connector.
6. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect A/F sensor 1 harness connector. 3. Turn ignition switch ON.

4. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 8. NG >> GO TO 7.
7. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M19, E108 G Harness connectors E10, F48 G Fuse block (J/B) connector M1 G 15A fuse G Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors.

Revision: December 2006

EC-1145

[QR25DE]
A

EC

C

D
BBIA0304E
E

F

G H

I
BBIA0304E
J

K

L

PBIB1683E

M

2006 Sentra

DTC P2A00 A/F SENSOR 1

8. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between the following terminals. Refer to Wiring Diagram.

A/F sensor 1 terminal 1 5 6 2

ECM terminal 16 35 56 75

[QR25DE]

Continuity should exist.
4. Check harness continuity between ECM terminals 16, 35, 56, 75 or A/F sensor 1 terminals 1, 2, 5, 6 and ground. Refer to Wiring Diagram.
Continuity should not exist.
5. Also check harness for short to power. OK or NG
OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK A/F SENSOR 1 HEATER
Refer to EC-756, "Component Inspection" . OK or NG
OK >> GO TO 10. NG >> GO TO 11.
10. CHECK INTERMITTENT INCIDENT
Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . OK or NG
OK >> GO TO 11. NG >> Repair or replace.
11. REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1. CAUTION: G Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one. G Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> INSPECTION END
Removal and Installation
AIR FUEL RATIO SENSOR Refer to EM-113, "EXHAUST MANIFOLD AND THREE WAY CATALYST" .

UBS00JK3

Revision: December 2006

EC-1146

2006 Sentra

ASCD BRAKE SWITCH
ASCD BRAKE SWITCH Component Description
When depress on the brake pedal, ASCD brake switch is turned OFF and stop lamp switch is turned ON. ECM detects the state of the brake pedal by this input of two kinds (ON/OFF signal) Refer to EC-623, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)" for the ASCD function.

[QR25DE]
PFP:25320
A
UBS00JZH
EC
C

D

CONSULT-II Reference Value in Data Monitor Mode

BBIA0117E
E
UBS00JZI

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

F

G Brake pedal: Fully released (A/T)

G Brake pedal and/or clutch pedal:

ON

Slightly depressed (M/T)

G

BRAKE SW1 (ASCD brake switch)

G Ignition switch: ON

G Brake pedal: Slightly depressed (A/

T)

OFF G Brake pedal and clutch pedal: Fully

H

released (M/T)

BRAKE SW2 (Stop lamp switch)

G Ignition switch: ON

Brake pedal: Fully released Brake pedal: Slightly depressed

OFF ON

I

J

K

L

M

Revision: December 2006

EC-1147

2006 Sentra

Wiring Diagram

ASCD BRAKE SWITCH

[QR25DE]
UBS00JZJ

Revision: December 2006

EC-1148

BBWA2169E
2006 Sentra

ASCD BRAKE SWITCH

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

101 R/G

Stop lamp switch

[Ignition switch: OFF] G Brake pedal: Fully released [Ignition switch: OFF]

Approximately 0V

C

BATTERY VOLTAGE

G Brake pedal: Slightly depressed

(11 - 14V)

D

[Ignition switch: ON]

G Brake pedal: Slightly depressed (A/T) G Brake pedal and/or clutch pedal: Sightly

Approximately 0V

E

108 P/L

ASCD brake switch

depressed (M/T) [Ignition switch: ON]

G Brake pedal: Fully released (A/T)

BATTERY VOLTAGE

F

G Brake pedal and clutch pedal: Fully released (11 - 14V)

(M/T)

G

H

I

J

K

L

M

Revision: December 2006

EC-1149

2006 Sentra

ASCD BRAKE SWITCH

Diagnostic Procedure
1. CHECK OVERALL FUNCTION-I

With CONSULT-II
1. Turn ignition switch ON.
2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT-II.
3. Check "BRAKE SW1" indication under the following conditions.
M/T models

CONDITION Clutch pedal and/or brake pedal: Slightly depressed Clutch pedal and brake pedal: Fully released

INDICATION OFF ON

A/T models

CONDITION Brake pedal: Slightly depressed Brake pedal: Fully released

INDICATION OFF ON

Without CONSULT-II
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 108 and ground under the following conditions.
M/T models

CONDITION Clutch pedal and/or brake pedal: Slightly depressed Clutch pedal and brake pedal: Fully released

VOLTAGE Approximately 0V
Battery voltage

A/T models

CONDITION
Brake pedal: Slightly depressed
Brake pedal: Fully released
OK or NG OK >> GO TO 2. NG (M/T models) >>GO TO 3. NG (A/T models) >>GO TO 4.

VOLTAGE Approximately 0V
Battery voltage

[QR25DE]
UBS00JZK
SEC011D
MBIB0061E

Revision: December 2006

EC-1150

2006 Sentra

ASCD BRAKE SWITCH

2. CHECK OVERALL FUNCTION-II

With CONSULT-II Check "BRAKE SW2" indication in "DATA MONITOR" mode.

CONDITION Brake pedal: Fully released Brake pedal: Slightly depressed

INDICATION OFF ON

Without CONSULT-II Check voltage between ECM terminal 101 and ground under the following conditions.

CONDITION Brake pedal: Fully released Brake pedal: Slightly depressed

VOLTAGE Approximately 0V
Battery voltage

OK or NG OK >> INSPECTION END NG >> GO TO 13.
3. CHECK ASCD BRAKE SWITCH CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect ASCD clutch switch harness connector. 3. Turn ignition switch ON.

4. Check voltage between ASCD clutch switch terminal 1 and ground under the following conditions with CONSULT-II or tester.

CONDITION
Brake pedal: Fully released
Brake pedal: Slightly depressed
OK or NG OK >> GO TO 10. NG >> GO TO 4.

VOLTAGE Battery voltage
Approx. 0V

Revision: December 2006

EC-1151

[QR25DE]
A EC
C D
SEC013D
E F G H
MBIB0060E
I J K L M
BBIA0118E
PBIB0799E
2006 Sentra

ASCD BRAKE SWITCH
4. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect ASCD brake switch harness connector. 3. Turn ignition switch ON.

[QR25DE]

4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK (M/T models)>>GO TO 6. OK (A/T models)>>GO TO 7. NG >> GO TO 5.

BBIA0117E

5. DETECT MALFUNCTIONING PART
Check the following. G Fuse block (J/B) connector M1 G 10A fuse G Harness for open or short between ASCD brake switch and fuse

PBIB0857E

>> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Check harness continuity between ASCD brake switch terminal 2 and ASCD clutch switch terminal 1.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 9. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-1152

2006 Sentra

ASCD BRAKE SWITCH
7. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 108 and ASCD brake switch terminal 2.
Refer to Wiring Diagram.
Continuity should exist. 4. Also check harness for short to ground or short to power. OK or NG
OK >> GO TO 9. NG >> GO TO 8.
8. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and ASCD brake switch

[QR25DE]
A EC
C D E F

>> Repair open circuit or short to ground or short to power in harness or connectors.

G

9. CHECK ASCD BRAKE SWITCH

Refer to EC-1155, "Component Inspection" .

H

OK or NG

OK >> GO TO 18.

NG >> Replace ASCD brake switch.

I

10. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

J

2. Disconnect ECM harness connector.

3. Check harness continuity between ECM terminal 108 and ASCD clutch switch terminal 2.

K

Refer to Wiring Diagram.

Continuity should exist.

4. Also check harness for short to ground and short to power.

L

OK or NG

OK >> GO TO 12. NG >> GO TO 11.

M

11. DETECT MALFUNCTIONING PART

Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and ASCD clutch switch

>> Repair open circuit or short to ground or short to power in harness or connectors.
12. CHECK ASCD CLUTCH SWITCH
Refer to EC-1155, "Component Inspection" . OK or NG
OK >> GO TO 18. NG >> Replace ASCD clutch switch.

Revision: December 2006

EC-1153

2006 Sentra

ASCD BRAKE SWITCH
13. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect stop lamp switch harness connector.

[QR25DE]

3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT -II or tester.

BBIA0105E

Voltage: Battery voltage OK or NG
OK >> GO TO 15. NG >> GO TO 14.
14. DETECT MALFUNCTIONING PART
Check the following. G Fuse block (J/B) connector M2 G 10A fuse G Harness for open or short between stop lamp switch and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
15. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
Refer to Wiring Diagram.
Continuity should exist. 3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 17. NG >> GO TO 16.

PBIB2284E

Revision: December 2006

EC-1154

2006 Sentra

ASCD BRAKE SWITCH
16. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and stop lamp switch

[QR25DE]
A EC

>> Repair open circuit or short to ground or short to power in harness or connectors. C
17. CHECK STOP LAMP SWITCH

Refer to EC-1155, "Component Inspection" .

D

OK or NG

OK >> GO TO 18.

NG >> Replace stop lamp switch.

E

18. CHECK INTERMITTENT INCIDENT

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

F

>> INSPECTION END
Component Inspection
ASCD BRAKE SWITCH

G
UBS00KQJ

1. Turn ignition switch OFF.

H

2. Disconnect ASCD brake switch harness connector.

3. Check harness continuity between ASCD brake switch terminals 1 and 2 under the following conditions.

I

Condition

Continuity

Brake pedal: Fully released

Should exist

Brake pedal: Slightly depressed

Should not exist

J

If NG, adjust ASCD brake switch installation, refer to BR-11, "BRAKE PEDAL AND BRACKET" , and perform step 3 again.
K

SEC023D

L

M

Revision: December 2006

EC-1155

2006 Sentra

ASCD BRAKE SWITCH

[QR25DE]

ASCD CLUTCH SWITCH (FOR M/T MODELS) 1. Turn ignition switch OFF. 2. Disconnect ASCD clutch switch harness connector. 3. Check harness continuity between ASCD clutch switch terminals 1 and 2 under the following conditions.

Condition

Continuity

Clutch pedal: Fully released

Should exist

Clutch pedal: Slightly depressed

Should not exist

If NG, adjust ASCD clutch switch installation, refer to CL-23, "CLUTCH SYSTEM" , and perform step 3 again.

SEC024D
STOP LAMP SWITCH 1. Turn ignition switch OFF. 2. Disconnect stop lamp switch harness connector. 3. Check harness continuity between stop lamp switch terminals 1 and 2 under the following conditions.

PBIB2285E

Condition Brake pedal: Fully released Brake pedal: Slightly depressed

Continuity Should not exist
Should exist

If NG, adjust stop lamp switch installation, refer to BR-11, "BRAKE PEDAL AND BRACKET" , and perform step 3 again.

Revision: December 2006

EC-1156

2006 Sentra

ASCD INDICATOR

[QR25DE]

ASCD INDICATOR Component Description

PFP:24814
A
UBS00JZL

ASCD indicator lamp illuminates to indicate ASCD operation status. Lamp has two indicators, CRUISE and

SET, and is integrated in combination meter.

EC

CRUISE indicator illuminates when MAIN switch on ASCD steering switch is turned ON to indicate that ASCD

system is ready for operation.

SET indicator illuminates when following conditions are met. C
G CRUISE indicator is illuminated.

G SET/COAST switch on ASCD steering switch is turned ON while vehicle speed is within the range of ASCD setting. D
SET indicator remains lit during ASCD control. Refer to EC-623, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)" for the ASCD function.

CONSULT-II Reference Value in Data Monitor Mode

UBS00JZM

E

Specification data are reference value.

MONITOR ITEM

CONDITION

SPECIFICATION

F

CRUISE LAMP

G Ignition switch: ON

MAIN switch: Pressed at 1st time  2nd time

ON  OFF

G MAIN switch: ON

ASCD: Operating

ON

G

G When vehicle speed is

SET LAMP

between 40 km/h (25 MPH) and 144

ASCD: Not operating

OFF

km/h (89 MPH)

H

I

J

K

L

M

Revision: December 2006

EC-1157

2006 Sentra

Wiring Diagram

ASCD INDICATOR

[QR25DE]
UBS00JZN

Revision: December 2006

EC-1158

BBWA2170E
2006 Sentra

Diagnostic Procedure
1. CHECK OVERALL FUNCTION

ASCD INDICATOR

[QR25DE]
UBS00JZO
A

Check ASCD indicator under the following conditions.

ASCD INDICATOR

CONDITION

SPECIFICATION

EC

CRUISE LAMP

G Ignition switch: ON

MAIN switch: Pressed at 1st time  2nd time

ON  OFF

C

G MAIN switch: ON

ASCD: Operating

ON

G When vehicle speed is

SET LAMP

between

40 km/h (25 MPH) and 144 ASCD: Not operating

OFF

D

km/h (89 MPH)

OK or NG

OK >> INSPECTION END

E

NG >> GO TO 2.

2. CHECK DTC

F

Check that DTC U1000 or U1001 is not displayed.
Yes or No G
Yes >> Perform trouble diagnoses for DTC U1000, U1001, refer to EC-743, "DTC U1000, U1001 CAN COMMUNICATION LINE" .
No >> GO TO 3. H
3. CHECK COMBINATION METER OPERATION

Does combination meter operate normally?

I

Yes or No

Yes >> GO TO 4. No >> Check combination meter circuit. Refer to DI-16, "Meter/Gauge Operation and Odo/Trip Meter J
Segment Check in Diagnosis Mode" .

4. CHECK INTERMITTENT INCIDENT K Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END

L

M

Revision: December 2006

EC-1159

2006 Sentra

ELECTRICAL LOAD SIGNAL

ELECTRICAL LOAD SIGNAL

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

CONDITION

LOAD SIGNAL

G Ignition switch: ON

Rear window defogger switch: ON and/or Lighting switch: 2ND position
Rear window defogger switch and lighting switch: OFF

HEATER FAN SW

G Engine: After warming up, idle the engine

Heater fan switch: ON Heater fan switch: OFF

[QR25DE]
PFP:25350
UBS00JZE
SPECIFICATION ON
OFF ON OFF

Revision: December 2006

EC-1160

2006 Sentra

Wiring Diagram

ELECTRICAL LOAD SIGNAL

[QR25DE]
UBS00JZF
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1161

BBWA2167E
2006 Sentra

ELECTRICAL LOAD SIGNAL

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

84 PU

Electrical load signal (Headlamp signal)

[Lighting switch: ON] G Lighting switch: 2nd position [Lighting switch: ON] G Lighting switch: OFF

BATTERY VOLTAGE (11 - 14V)
Approximately 0V

Revision: December 2006

EC-1162

2006 Sentra

ELECTRICAL LOAD SIGNAL

[QR25DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1163

BBWA2316E
2006 Sentra

ELECTRICAL LOAD SIGNAL

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

96 Y/G

Electrical load signal (Heater fan switch)

[Engine is running] G Heater fan switch: ON [Engine is running] G Heater fan switch: OFF

Approximately 0V Approximately 5V

Revision: December 2006

EC-1164

2006 Sentra

ELECTRICAL LOAD SIGNAL

[QR25DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1165

BBWA2168E
2006 Sentra

ELECTRICAL LOAD SIGNAL

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

93 L/W

Electrical load signal (Rear window defogger signal)

[Ignition switch: ON] G Rear window defogger switch: ON [Ignition switch: ON] G Rear window defogger switch: OFF

BATTERY VOLTAGE (11 - 14V)
Approximately 0V

Diagnostic Procedure
1. INSPECTION START

UBS00JZG

Do you have CONSULT-II? Yes or No
Yes >> GO TO 2. No >> GO TO 3.
2. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-1

With CONSULT-II
1. Turn ignition switch ON. 2. Check "LOAD SIGNAL" in "DATA MONITOR" mode with CON-
SULT-II under the following conditions.

Condition
Lighting switch: ON at 2nd position
Lighting switch: OFF
OK or NG OK >> GO TO 4. NG >> GO TO 8.

LOAD SIGNAL ON OFF

3. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-1

PBIB0103E

Without CONSULT-II 1. Turn ignition switch ON.
2. Check voltage between ECM terminal 84 and ground under the following conditions.

Condition
Lighting switch: ON at 2nd position
Lighting switch: OFF
OK or NG OK >> GO TO 5. NG >> GO TO 8.

Voltage BATTERY VOLTAGE 0V

MBIB0158E

Revision: December 2006

EC-1166

2006 Sentra

ELECTRICAL LOAD SIGNAL

4. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-2

With CONSULT-II 1. Turn ignition switch ON.
2. Check "LOAD SIGNAL" in "DATA MONITOR" mode with CONSULT-II under the following conditions.

Condition
Heater fan switch: ON
Heater fan control switch: OFF
OK or NG OK >> GO TO 6. NG >> GO TO 13.

LOAD SIGNAL ON OFF

5. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-2

Without CONSULT-II 1. Turn ignition switch ON. 2. Check voltage between ECM terminal 96 and ground under the
following conditions.

Condition
Heater fan switch: ON
Heater fan switch: OFF
OK or NG OK >> GO TO 7. NG >> GO TO 13.

Voltage Approximately 0V Approximately 5V

6. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-3

With CONSULT-II 1. Turn ignition switch ON. 2. Check "LOAD SIGNAL" in "DATA MONITOR" mode with CON-
SULT-II under the following conditions.

Condition
Rear window defogger switch: ON
Rear window defogger switch: OFF
OK or NG OK >> INSPECTION END NG >> GO TO 16.

LOAD SIGNAL ON OFF

[QR25DE]
A EC
C D E
PBIB0103E
F G H I J
PBIB1219E
K L M
PBIB0103E

Revision: December 2006

EC-1167

2006 Sentra

ELECTRICAL LOAD SIGNAL
7. CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-3

[QR25DE]

Without CONSULT-II 1. Turn ignition switch ON.
2. Check voltage between ECM terminal 93 and ground under the following conditions.

Condition
Rear window defogger switch: ON
Rear window defogger switch: OFF
OK or NG OK >> INSPECTION END NG >> GO TO 16.

Voltage BATTERY VOLTAGE Approximately 0V

8. CHECK HEADLAMP FUNCTION

PBIB1773E

1. Start engine. 2. Turn the lighting switch ON at 2nd position. 3. Check that headlamps are illuminated. OK or NG
OK (Models for USA)>>GO TO 9. OK (Models for Canada)>>GO TO 11. NG >> Refer to LT-6, "HEADLAMP (FOR USA)" or LT-10, "HEADLAMP (FOR CANADA) -- DAYTIME
LIGHT SYSTEM --" .
9. CHECK HEADLAMP INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Stop engine and turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Disconnect lighting switch harness connectors. 4. Check harness continuity between ECM terminal 84 and lighting switch terminal 9, 10 under the following
conditions.

Condition

Continuity

1

Should exist

2

Should not exist

5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 19. NG >> GO TO 10.

Revision: December 2006

EC-1168

PBIB1774E
2006 Sentra

ELECTRICAL LOAD SIGNAL
10. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E108, M19 G Harness connectors M58, F26 G Diode-3 G Harness for open or short between ECM and lighting switch

[QR25DE]
A EC
C

>> Repair open circuit or short to ground or short to power in harness or connectors.

11. CHECK HEADLAMP INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

D

1. Stop engine and turn ignition switch OFF.

2. Disconnect ECM harness connector.

E

3. Disconnect lighting switch harness connector E115. Disconnect daytime light control unit harness connector.

4. Check harness continuity between ECM terminal 84 and lighting switch terminal 10, daytime light control F unit terminal 6 under the following conditions.

G

H

I

Condition

Continuity

1

Should exist

2

Should not exist

5. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 19. NG >> GO TO 12.

12. DETECT MALFUNCTIONING PART

Check the following. G Harness connectors E108, M19 G Harness connectors M58, F26 G Diode-3 G Harness for open or short between ECM and lighting switch G Harness for open or short between ECM and daytime light control unit

PBIB2510E
J
K
L
M

>> Repair open circuit or short to ground or short to power in harness or connectors.

Revision: December 2006

EC-1169

2006 Sentra

ELECTRICAL LOAD SIGNAL
13. CHECK HEATER FAN SWITCH FUNCTION

[QR25DE]

1. Turn the heater fan switch ON. 2. Check that heater fan turns properly. OK or NG
OK >> GO TO 14. NG >> Refer to MTC-19, "TROUBLE DIAGNOSIS"
14. CHECK HEATER FAN SW INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Disconnect air control harness connector. 4. Disconnect fan control switch harness connector. 5. Check harness continuity between ECM terminal 96 and air control terminal 8, fan control switch terminal
6. Refer to Wiring Diagram.
Continuity should exist.
6. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 19. NG >> GO TO 15.
15. DETECT MALFUNCTIONING PART

Check the following. G Harness connectors M59, F27 G Harness for open or short between ECM and air control G Harness for open or short between ECM and fan control switch

>> Repair open circuit or short to ground or short to power in harness or connectors.
16. CHECK REAR WINDOW DEFOGGER FUNCTION
1. Turn ignition switch OFF. 2. Turn ON the rear window defogger switch. 3. Check the rear windshield. Is the rear windshield and door mirror (with heated mirror models) heated up? Yes or No
Yes >> GO TO 17. No >> Refer to GW-17, "REAR WINDOW DEFOGGER"
17. CHECK REAR WINDOW DEFOGGER INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector. 2. Disconnect rear window defogger relay. 3. Check harness continuity between ECM terminal 93 and rear window defogger relay terminals 5, 7.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 19. NG >> GO TO 18.

Revision: December 2006

EC-1170

2006 Sentra

ELECTRICAL LOAD SIGNAL
18. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors B1, M14 G Harness connectors M58, F26 G Harness for open or short between ECM and rear window defogger relay.
>> Repair open circuit or short to ground or short to power in harness or connectors.
19. CHECK INTERMITTENT INCIDENT
Perform EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

[QR25DE]
A EC
C D

>> INSPECTION END

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-1171

2006 Sentra

FUEL INJECTOR
FUEL INJECTOR
Component Description
The fuel injector is a small, precise solenoid valve. When the ECM supplies a ground to the fuel injector circuit, the coil in the fuel injector is energized. The energized coil pulls the ball valve back and allows fuel to flow through the fuel injector into the intake manifold. The amount of fuel injected depends upon the injection pulse duration. Pulse duration is the length of time the fuel injector remains open. The ECM controls the injection pulse duration based on engine fuel needs.

[QR25DE]
PFP:16600
UBS00JYY

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

CONDITION

B/FUEL SCHDL

G See EC-725, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .

INJ PULSE-B1

G Engine: After warming up G Shift lever: P or N (A/T), Neutral (M/T) G Air conditioner switch: OFF G No-load

Idle 2,000 rpm

SEF375Z UBS00JYZ
SPECIFICATION 2.0 - 3.0 msec 1.9 - 2.9 msec

Revision: December 2006

EC-1172

2006 Sentra

Wiring Diagram

FUEL INJECTOR

[QR25DE]
UBS00JZ0
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1173

BBWA2166E
2006 Sentra

FUEL INJECTOR

[QR25DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

BATTERY VOLTAGE (11 - 14V)

[Engine is running] G Warm-up condition G Idle speed

22 G/B 23 R/B 41 L/B 42 Y/B

Fuel injector No. 3 Fuel injector No. 1 Fuel injector No. 4 Fuel injector No. 2

[Engine is running] G Warm-up condition G Engine speed: 2,000 rpm

BATTERY VOLTAGE (11 - 14V)

PBIB0529E

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
1. INSPECTION START
Turn ignition switch to START. Is any cylinder ignited? Yes or No
Yes >> GO TO 2. No >> GO TO 3.

PBIB0530E UBS00JZ1

Revision: December 2006

EC-1174

2006 Sentra

FUEL INJECTOR
2. CHECK OVERALL FUNCTION
With CONSULT-II 1. Start engine. 2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with
CONSULT-II. 3. Make sure that each circuit produces a momentary engine
speed drop.
Without CONSULT-II 1. Start engine. 2. Listen to each fuel injector operating sound.
Clicking noise should be heard.
OK or NG OK >> INSPECTION END NG >> GO TO 3.

[QR25DE]
A EC
C D E
PBIB0133E
F G H I
PBIB1986E
J K L M

Revision: December 2006

EC-1175

2006 Sentra

FUEL INJECTOR
3. CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect fuel injector harness connector. 3. Turn ignition switch ON.

[QR25DE]

4. Check voltage between fuel injector terminal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 5. NG >> GO TO 4.

BBIA0024E

4. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors M19, E108 G Harness connectors E10, F48 G Harness connectors F12, F101 G Fuse block (J/B) connector M1 G 10A fuse G Harness for open or short between fuel injector and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between fuel injector terminal 2 and ECM terminals 22, 23, 41, 42.
Refer to Wiring Diagram.
Continuity should exist. 4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 7. NG >> GO TO 6.

PBIB0582E

Revision: December 2006

EC-1176

2006 Sentra

FUEL INJECTOR
6. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors F12, F101 G Harness for open or short between fuel injector and ECM

[QR25DE]
A EC

>> Repair open circuit or short to ground or short to power in harness or connectors. C
7. CHECK FUEL INJECTOR

Refer to EC-1177, "Component Inspection" .

D

OK or NG

OK >> GO TO 8.

NG >> Replace fuel injector.

E

8. CHECK INTERMITTENT INCIDENT

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

F

>> INSPECTION END
Component Inspection
FUEL INJECTOR 1. Disconnect fuel injector harness connector. 2. Check resistance between terminals as shown in the figure.
Resistance: 11.6 - 14.9 [at 10 - 60°C (50 - 140°F)]

G
UBS00JZ2
H
I

J

Removal and Installation
FUEL INJECTOR
Refer to EM-121, "FUEL INJECTOR AND FUEL TUBE" .

K
PBIB1727E UBS00JZ3
L
M

Revision: December 2006

EC-1177

2006 Sentra

FUEL PUMP
Description
SYSTEM DESCRIPTION

FUEL PUMP

[QR25DE]
PFP:17042
UBS00JZ4

Sensor

Input Signal to ECM

ECM Function

Actuator

Crankshaft position sensor (POS) Camshaft position sensor (PHASE)
Battery

Engine speed* Battery voltage*

Fuel pump control

Fuel pump relay

*: ECM determines the start signal status by the signals of engine speed and battery voltage.

The ECM activates the fuel pump for 1 seconds after the ignition switch is turned ON to improve engine start ability. If the ECM receives a engine speed signal from the crankshaft position sensor (POS) and camshaft position sensor (PHASE), it knows that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging, thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay, which in turn controls the fuel pump.

Ignition switch is turned to ON Engine running or cranking When engine is stopped Except as shown above

Condition

Fuel pump operation Operates for 1 second
Operates Stops in 1.5 seconds
Stops

COMPONENT DESCRIPTION A turbine type design fuel pump is used in the fuel tank.

CONSULT-II Reference Value in Data Monitor Mode

Specification data are reference values.

MONITOR ITEM

CONDITION

FUEL PUMP RLY

G For 1 seconds after turning ignition switch ON G Engine running or cranking G Except above conditions

PBIB1218E UBS00JZ5
SPECIFICATION ON OFF

Revision: December 2006

EC-1178

2006 Sentra

Wiring Diagram

FUEL PUMP

[QR25DE]
UBS00JZ6
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1179

BBWA1405E
2006 Sentra

FUEL PUMP

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

113*1 114*2

B/P

Fuel pump relay

[Ignition switch: ON] G For 1 second after turning ignition switch
ON [Engine is running]
[Ignition switch: ON] G More than 1 second after turning ignition
switch ON.

0 - 1.0V
BATTERY VOLTAGE (11 - 14V)

*1: Without NVIS (NATS). *2: With NVIS (NATS).

Diagnostic Procedure
1. CHECK OVERALL FUNCTION

UBS00JZ7

1. Turn ignition switch ON.
2. Pinch fuel feed hose with two fingers. Fuel pressure pulsation should be felt on the fuel hose for 1 second after ignition switch is turned ON.
OK or NG
OK >> INSPECTION END NG >> GO TO 2.

BBIA0110E

Revision: December 2006

EC-1180

2006 Sentra

FUEL PUMP
2. CHECK FUEL PUMP RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. 2. Disconnect fuel pump relay. 3. Turn ignition switch ON.

[QR25DE]
A EC
C

D

4. Check voltage between fuel pump relay terminals 1, 5 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 4. NG >> GO TO 3.

BBIA0307E
E
F
G

3. DETECT MALFUNCTIONING PART
Check the following. G Fuse block (J/B) connector B4 G 10A fuse G 15A fuse G Harness for open or short between fuse and fuel pump relay

H
PBIB0657E
I
J
K

>> Repair open circuit or short to ground or short to power in harness or connectors. L
4. CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF. 2. Disconnect "fuel level sensor unit and fuel pump" harness con-
nector. 3. Check harness continuity between the following;
fuel pump relay terminal 3 and fuel pump terminal 1, fuel pump terminal 3 and ground. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

M
BBIA0132E

Revision: December 2006

EC-1181

2006 Sentra

FUEL PUMP
5. CHECK FUEL PUMP RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

[QR25DE]

1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 113 [without NVIS (NATS)] or 114 [with NVIS (NATS)]
and fuel pump relay terminal 2. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 7. NG >> GO TO 6.
6. DETECT MALFUNCTIONING PART

Check the following. G Harness connectors B3, M16 G Harness connectors M58, F26 G Harness for open or short between ECM and fuel pump relay

>> Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK FUEL PUMP RELAY
Refer to EC-1182, "Component Inspection" . OK or NG
OK >> GO TO 8. NG >> Replace fuel pump relay.
8. CHECK FUEL PUMP
Refer to EC-1182, "Component Inspection" . OK or NG
OK >> GO TO 9. NG >> Replace fuel pump.
9. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
FUEL PUMP RELAY Check continuity between terminals 3 and 5 under the following conditions.

Conditions
12V direct current supply between terminals 1 and 2
No current supply

Continuity Yes No

UBS00JZ8

Revision: December 2006

EC-1182

PBIB0098E
2006 Sentra

FUEL PUMP
FUEL PUMP 1. Disconnect "fuel level sensor unit and fuel pump" harness connector. 2. Check resistance between "fuel level sensor unit and fuel pump"
terminals 1 and 3. Resistance: 0.2 - 5.0 [at 25°C (77°F)]

[QR25DE]
A EC
C

Removal and Installation
FUEL PUMP
Refer to FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" .

D

PBIB0928E

UBS00JZ9

E

F

G

H

I

J

K

L

M

Revision: December 2006

EC-1183

2006 Sentra

IGNITION SIGNAL
IGNITION SIGNAL Component Description
IGNITION COIL & POWER TRANSISTOR The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns ON and OFF the ignition coil primary circuit. This ON-OFF operation induces the proper high voltage in the coil secondary circuit.

[QR25DE]
PFP:22448
UBS00JYN
BBIA0106E

Revision: December 2006

EC-1184

2006 Sentra

Wiring Diagram

IGNITION SIGNAL

[QR25DE]
UBS00JYO
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1185

BBWA2030E
2006 Sentra

IGNITION SIGNAL

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

111 W/G

ECM relay (Self shut-off)

[Engine is running] [Ignition switch: OFF]
G For a few seconds after turning ignition switch OFF
[Ignition switch: OFF] G More than a few seconds after turning
ignition switch OFF

0 - 1.0V
BATTERY VOLTAGE (11 - 14V)

119 120

R/G

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE (11 - 14V)

Revision: December 2006

EC-1186

2006 Sentra

IGNITION SIGNAL

[QR25DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1187

BBWA2164E
2006 Sentra

IGNITION SIGNAL

[QR25DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

0 - 0.1V

[Engine is running] G Warm-up condition G Idle speed

62 BR 81 PU

Ignition signal No. 1 Ignition signal No. 2

[Engine is running] G Warm-up condition G Engine speed: 2,000 rpm.

0 - 0.2V

PBIB0521E

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

PBIB0522E

Revision: December 2006

EC-1188

2006 Sentra

IGNITION SIGNAL

[QR25DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1189

BBWA2165E
2006 Sentra

IGNITION SIGNAL

[QR25DE]

Specification data are reference values and are measured between each terminal and ground. Pulse signal is measured by CONSULT-II.
CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

0 - 0.1V

[Engine is running] G Warm-up condition G Idle speed

61 L/W

Ignition signal No. 3

80 GY/R Ignition signal No. 4

[Engine is running] G Warm-up condition G Engine speed: 2,000 rpm.

0 - 0.2V

PBIB0521E

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
1. CHECK ENGINE START
Turn ignition switch OFF, and restart engine. Is engine running? Yes or No
Yes (With CONSULT-II)>>GO TO 2. Yes (Without CONSULT-II)>>GO TO 3. No >> GO TO 4.
2. CHECK OVERALL FUNCTION
With CONSULT-II 1. Perform "POWER BALANCE" in "ACTIVE TEST" mode with
CONSULT-II. 2. Make sure that all circuits do not produce a momentary engine
speed drop. OK or NG
OK >> INSPECTION END NG >> GO TO 12.

PBIB0522E UBS00JYP

PBIB0133E

Revision: December 2006

EC-1190

2006 Sentra

IGNITION SIGNAL
3. CHECK OVERALL FUNCTION
Without CONSULT-II 1. Let engine idle. 2. Read the voltage signal between ECM terminals 61, 62, 80, 81
and ground with an oscilloscope. 3. Verify that the oscilloscope screen shows the signal wave as
shown below. NOTE: The pulse cycle changes depending on rpm at idle.

OK or NG
OK >> INSPECTION END NG >> GO TO 12.

PBIB0521E

4. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I

1. Turn ignition switch ON. 2. Check voltage between ECM terminals 119, 120 and ground
with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 5. NG >> Go to EC-736, "POWER SUPPLY AND GROUND CIRCUIT" .

5. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF. 2. Disconnect condenser harness connector. 3. Turn ignition switch ON. 4. Check voltage between condenser terminal + and ground with
CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 10. NG >> GO TO 6.

Revision: December 2006

EC-1191

[QR25DE]
A EC
C D E
PBIB1204E
F G H I J K
MBIB0034E
L M
PBIB0851E
2006 Sentra

IGNITION SIGNAL
6. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF. 2. Disconnect ECM relay. 3. Check harness continuity between ECM relay terminal 7 and
condenser terminal +. Refer to Wiring Diagram.
Continuity should exist. 4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 7. NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
7. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV
Check voltage between ECM relay terminal 6 and ground with CONSULT-II or tester.
Voltage: Battery voltage OK or NG
OK >> GO TO 9. NG >> GO TO 8.
8. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E10, F48 G Fuse and fusible link box connector E22 G 15A fuse G Harness for open or short between ECM relay and battery
>> Repair or replace harness or connectors.
9. CHECK ECM RELAY
Refer to EC-1194, "Component Inspection" . OK or NG
OK >> GO TO 16. NG >> Replace ECM relay.

[QR25DE]
BBIA0100E PBIB0625E

Revision: December 2006

EC-1192

2006 Sentra

IGNITION SIGNAL
10. CHECK CONDENSER GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect condenser harness connector. 3. Check harness continuity between condenser terminal - and ground.
Refer to Wiring diagram. Continuity should exist.
4. Also check harness for short to power. OK or NG
OK >> GO TO 11. NG >> Repair open circuit or short to power in harness or connector.
11. CHECK CONDENSER
Refer to EC-1194, "Component Inspection" . OK or NG
OK >> GO TO 12. NG >> Replace condenser.
12. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-V
1. Turn ignition switch OFF. 2. Disconnect ignition coil harness connector. 3. Turn ignition switch ON.
4. Check voltage between ignition coil terminal 3 and ground with CONSULT-II or tester. Voltage: Battery voltage
OK or NG OK >> GO TO 13. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

[QR25DE]
A

EC

C

D

E

F

G

H

I

J

BBIA0106E

K

L

M

PBIB0138E

Revision: December 2006

EC-1193

2006 Sentra

IGNITION SIGNAL
13. CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT

[QR25DE]

1. Turn ignition switch OFF. 2. Check harness continuity between ignition coil terminal 2 and ground.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to power. OK or NG
OK >> GO TO 14. NG >> Repair open circuit or short to power in harness or connectors.
14. CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminals 61, 62, 80, 81 and ignition coil terminal 1.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 15. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
15. CHECK IGNITION COIL WITH POWER TRANSISTOR

Refer to EC-1194, "Component Inspection" . OK or NG
OK >> GO TO 16. NG >> Replace ignition coil with power transistor.
16. CHECK INTERMITTENT INCIDENT

Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
ECM RELAY 1. Apply 12V direct current between ECM relay terminals 1 and 2. 2. Check continuity between relay terminals 3 and 5, 6 and 7.

Condition 12V direct current supply between terminals 1 and 2 OFF
3. If NG, replace ECM relay.

Continuity Yes No

UBS00JYQ

CONDENSER 1. Turn ignition switch OFF. 2. Disconnect condenser harness connector.

PBIB0077E

Revision: December 2006

EC-1194

2006 Sentra

IGNITION SIGNAL
3. Check resistance between condenser terminals + and -. Resistance: Above 1 M [at 25°C (77°F)]

[QR25DE]
A EC

C

IGNITION COIL WITH POWER TRANSISTOR

PBIB0848E
D

CAUTION: Do the following procedure in the place where ventilation is good without the combustible.
E 1. Turn ignition switch OFF.

2. Disconnect ignition coil harness connector.

3. Check resistance between ignition coil terminals as follows.

F

Terminal No. (Polarity)

Resistance  [at 25°C (77°F)]

1 and 2

Except 0 or 

G

1 and 3

Except 0

2 and 3

4. If NG, Replace ignition coil with power transistor. If OK, go to next step.
5. Turn ignition switch OFF.
6. Reconnect all harness connectors disconnected.
7. Remove fuel pump fuse in located in fuse box to release fuel pressure.
NOTE: Do not use CONSULT-II to release fuel pressure, or fuel pressure applies again during the following procedure.
8. Start engine.
9. After engine stalls, crank it two or three times to release all fuel pressure.
10. Turn ignition switch OFF.
11. Remove ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
12. Remove ignition coil and spark plug of the cylinder to be checked.
13. Crank engine for five seconds or more to remove combustion gas in the cylinder.
14. Connect spark plug and harness connector to ignition coil.
15. Fix ignition coil using a rope etc. with gap of 13 - 17 mm between the edge of the spark plug and grounded metal portion as shown in the figure.
16. Crank engine for about three seconds, and check whether spark is generated between the spark plug and the grounded part.

H

MBIB0032E

I

J

K

L
LEC298
M

Spark should be generated.

CAUTION: G Do not approach to the spark plug and the ignition coil
within 50cm. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20kV or more.
G It might cause to damage the ignition coil if the gap of more than 17 mm is taken.

PBIB2325E

Revision: December 2006

EC-1195

2006 Sentra

IGNITION SIGNAL

[QR25DE]

NOTE: When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.
17. If NG, Replace ignition coil with power transistor.

Removal and Installation
IGNITION COIL WITH POWER TRANSISTOR
Refer to EM-118, "IGNITION COIL" .

UBS00JYR

Revision: December 2006

EC-1196

2006 Sentra

REFRIGERANT PRESSURE SENSOR
REFRIGERANT PRESSURE SENSOR Component Description
The refrigerant pressure sensor is installed at the liquid tank of the air conditioner system. The sensor uses an electrostatic volume pressure transducer to convert refrigerant pressure to voltage. The voltage signal is sent to ECM, and ECM controls cooling fan system.

[QR25DE]
PFP:92136
A
UBS00JZA
EC
C
D
BBIA0133E
E
F
G
H
PBIB2657E
I
J
K
L
M

Revision: December 2006

EC-1197

2006 Sentra

Wiring Diagram

REFRIGERANT PRESSURE SENSOR

[QR25DE]
UBS00JZB

Revision: December 2006

EC-1198

BBWA1452E
2006 Sentra

REFRIGERANT PRESSURE SENSOR

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

49 R/Y

Sensor power supply (Refrigerant pressure sensor)

[Ignition switch: ON]

C
Approximately 5V

Sensor ground (MAF sensor, IAT sensor,

D

ECT sensor, EVAP control [Engine is running]

67 B/W

system pressure sensor,

G Warm-up condition

Approximately 0V

PSP sensor, ASCD steering G Idle speed

E

switch, Refrigerant pressure

sensor)

70 L

Refrigerant pressure sensor

[Engine is running] G Warm-up condition G Both A/C switch and blower switch: ON
(Compressor operates.)

Diagnostic Procedure
1. CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION

1.0 - 4.0V

1. Start engine and warm it up to normal operating temperature.
2. Turn A/C switch and blower switch ON. 3. Check voltage between ECM terminal 70 and ground with CON-
SULT-II or tester.

F
G
UBS00JZC
H
I

Voltage: 1.0 - 4.0V J
OK or NG

OK >> INSPECTION END

NG >> GO TO 2.

K

PBIB1188E

L

M

Revision: December 2006

EC-1199

2006 Sentra

REFRIGERANT PRESSURE SENSOR
2. CHECK GROUND CONNECTIONS
1. Turn A/C switch and blower switch OFF. 2. Stop engine and turn ignition switch OFF. 3. Loosen and retighten engine two screws on the body.
Refer to EC-742, "Ground Inspection" .

[QR25DE]

OK or NG OK >> GO TO 3. NG >> Repair or replace ground connections.
3. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Disconnect refrigerant pressure sensor harness connector. 2. Turn ignition switch ON.

BBIA0515E

3. Check voltage between refrigerant pressure sensor terminal 3 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK or NG OK >> GO TO 5. NG >> GO TO 4.

BBIA0133E

4. DETECT MALFUNCTIONING PART
Check the following. G Harness connectors E9, F47 G Harness for open or short between ECM and refrigerant pressure sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.

SEF509Y

Revision: December 2006

EC-1200

2006 Sentra

REFRIGERANT PRESSURE SENSOR

[QR25DE]

5. CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT A

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Disconnect TCM harness connector (A/T models).

EC

4. Check harness continuity between refrigerant pressure sensor terminal 1 and ECM terminal 67, TCM ter-

minal 42.

Refer to Wiring Diagram.

C

Continuity should exist.

5. Also check harness for short to ground and short to power.

D

OK or NG

OK >> GO TO 7.

NG >> GO TO 6.

E

6. DETECT MALFUNCTIONING PART

Check the following.

F

G Harness connectors E10, F48

G Harness for open or short between ECM and refrigerant pressure sensor G
G Harness for open or short between TCM and refrigerant pressure sensor (A/T models)

>> Repair open circuit or short to ground or short to power in harness or connectors.

H

7. CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between ECM terminal 70 and refrigerant pressure sensor terminal 2.

I

Refer to Wiring Diagram.

Continuity should exist. J
2. Also check harness for short to ground and short to power.

OK or NG

OK >> GO TO 9.

K

NG >> GO TO 8.

8. DETECT MALFUNCTIONING PART

L

Check the following.

G Harness connectors E10, F48

G Harness for open or short between ECM and refrigerant pressure sensor

M

>> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . OK or NG
OK >> Replace refrigerant pressure sensor. NG >> Repair or replace.
Removal and Installation
REFRIGERANT PRESSURE SENSOR Refer to MTC-77, "REFRIGERANT LINES" .

UBS00JZD

Revision: December 2006

EC-1201

2006 Sentra

VIAS

VIAS

Description
SYSTEM DESCRIPTION

Sensor

Input Signal to ECM

ECM function

Mass air flow sensor

Amount of intake air

Throttle position sensor

Throttle position

Accelerator pedal position sensor
Battery
Crankshaft position sensor (POS) Camshaft position sensor (PHASE)

Closed throttle position Battery voltage*
Engine speed*

VIAS control

Engine coolant temperature sensor

Engine coolant temperature

*: ECM determines the start signal status by the signals of engine speed and battery voltage.

[QR25DE]
PFP:14956
UBS00JYS
Actuator
VIAS control solenoid valve

PBIB0843E
When the engine is running at low or medium speed, the power valve is fully closed. Under this condition, the effective suction port length is equivalent to the total length of the intake manifold collector's suction port including the intake valve. This long suction port provides increased air intake which results in improved suction efficiency and higher torque generation. The surge tank and one-way valve are provided. When engine is running at high speed, the ECM sends the signal to the VIAS control solenoid valve. This signal introduces the intake manifold vacuum into the power valve actuator and therefore opens the power valve to two suction passages together in the collector. Under this condition, the effective port length is equivalent to the length of the suction port provided independently for each cylinder. This shortened port length results in enhanced engine output with reduced suction resistance under high speeds.

Revision: December 2006

EC-1202

2006 Sentra

VIAS
COMPONENT DESCRIPTION Power Valve The power valve is installed in intake manifold collector and used to control the suction passage of the variable induction air control system. It is set in the fully closed or fully opened position by the power valve actuator operated by the vacuum stored in the surge tank. The vacuum in the surge tank is controlled by the VIAS control solenoid valve.

VIAS Control Solenoid Valve
The VIAS control solenoid valve cuts the intake manifold vacuum signal for power valve actuator. It responds to ON/OFF signals from the ECM. When the solenoid is OFF, the vacuum signal from the intake manifold is cut. When the ECM sends an ON signal the coil pulls the plunger downward and feeds the vacuum signal to the power valve actuator.

CONSULT-II Reference Value in Data Monitor Mode

MONITOR ITEM VIAS S/V

G Engine: After warming up

CONDITION Idle More than 5,000 rpm

[QR25DE]
A

EC

C

D
BBIA0022E
E

F

G

H
BBIA0022E

UBS00JYT
I
SPECIFICATION

OFF

ON

J

K

L

M

Revision: December 2006

EC-1203

2006 Sentra

Wiring Diagram

VIAS

[QR25DE]
UBS00JYU

Revision: December 2006

EC-1204

BBWA2269E
2006 Sentra

VIAS

[QR25DE]

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

A

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

EC
DATA (DC Voltage)

[Engine is running]

BATTERY VOLTAGE

C

G Idle speed

(11 - 14V)

29 Y/R

VIAS control solenoid valve

[Engine is running]

G Engine speed: Above 5,000 rpm

0 - 1.0V

D

[Engine is running]

[Ignition switch: OFF]

0 - 1.0V G For a few seconds after turning ignition

E

111 W/G

ECM relay (Self shut-off)

switch OFF

[Ignition switch: OFF]

BATTERY VOLTAGE

G More than a few seconds after turning (11 - 14V)

F

ignition switch OFF

119 120

R/G

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE

(11 - 14V)

G

H

I

J

K

L

M

Revision: December 2006

EC-1205

2006 Sentra

VIAS Diagnostic Procedure
1. CHECK OVERALL FUNCTION
With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Perform "VIAS SOL VALVE" in "ACTIVE TEST" mode with CON-
SULT-II.
3. Turn VIAS control solenoid valve ON and OFF, and make sure that power valve actuator rod moves.
Without CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Rev engine quickly up to above 5,000 rpm and make sure that
power valve actuator rod moves.
OK or NG OK >> INSPECTION END NG (With CONSULT-II)>>GO TO 2. NG (Without CONSULT-II)>>GO TO 3.

[QR25DE]
UBS00JYV
PBIB0844E BBIA0023E
BBIA0023E

Revision: December 2006

EC-1206

2006 Sentra

VIAS

2. CHECK VACUUM EXISTENCE

With CONSULT-II 1. Stop engine and disconnect vacuum hose connected to power valve actuator.
2. Start engine and let it idle. 3. Perform "VIAS SOL VALVE" in "ACTIVE TEST" mode with CON-
SULT-II. 4. Turn VIAS control solenoid valve "ON" and "OFF", and check
vacuum existence under the following conditions.

VIAS SOL VALVE

Vacuum

ON

Should exist

OFF

Should not exist

OK or NG
OK >> Repair or replace power valve actuator. NG >> GO TO 4.

3. CHECK VACUUM EXISTENCE

Without CONSULT-II 1. Stop engine and disconnect vacuum hose connected to power valve actuator. 2. Disconnect VIAS control solenoid valve harness connector. 3. Start engine and let it idle. 4. Apply 12V of direct current between VIAS control solenoid valve
terminals 1 and 2. 5. Check vacuum existence under the following conditions.

Condition

Vacuum

12V direct current supply

Should exist

No supply

Should not exist

OK or NG

OK >> Repair or replace power valve actuator. NG >> GO TO 4.

4. CHECK VACUUM HOSE

1. Stop engine.
2. Check hoses and tubes between intake manifold and power valve actuator for crack, clogging, improper connection or disconnection. Refer to EC-695, "Vacuum Hose Drawing" .
OK or NG
OK >> GO TO 5. NG >> Repair hoses or tubes.

5. CHECK VACUUM TANK
Refer to EC-1208, "Component Inspection" . OK or NG
OK >> GO TO 6. NG >> Replace vacuum tank.
Revision: December 2006

EC-1207

[QR25DE]
A EC
C D E
PBIB0844E
F G H I J K
PBIB0845E
L M
SEF109L
2006 Sentra

VIAS
6. CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF. 2. Disconnect VIAS control solenoid valve harness connector. 3. Turn ignition switch ON.

[QR25DE]

4. Check voltage between VIAS control solenoid valve terminal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG OK >> GO TO 7. NG >> Repair open circuit or short to ground or short to power in harness or connectors.

BBIA0022E

PBIB0173E
7. CHECK VIAS CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 29 and VIAS control solenoid valve terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power. OK or NG
OK >> GO TO 8. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK VIAS CONTROL SOLENOID VALVE
Refer to EC-1208, "Component Inspection" . OK or NG
OK >> GO TO 9. NG >> Replace VIAS control solenoid valve.
9. CHECK INTERMITTENT INCIDENT
Refer to EC-735, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

>> INSPECTION END
Component Inspection
VIAS CONTROL SOLENOID VALVE With CONSULT-II
1. Reconnect harness connectors disconnected.

Revision: December 2006

EC-1208

UBS00JYW
2006 Sentra

VIAS

2. Turn ignition switch ON.
3. Perform "VIAS SOL VALVE" in "ACTIVE TEST" mode. 4. Check air passage continuity and operation delay time under the
following conditions.

Condition VIAS SOL VALVE

Air passage continuity between A and B

ON

Yes

OFF

No

Operation takes less than 1 second.

Air passage continuity between A and C
No
Yes

Without CONSULT-II
Check air passage continuity and operation delay time under the following conditions.

Condition
12V direct current supply between terminals 1 and 2 No supply

Air passage continuity between A and B
Yes
No

Operation takes less than 1 second.

Air passage continuity between A and C
No
Yes

VACUUM TANK 1. Disconnect vacuum hose connected to vacuum tank. 2. Connect a vacuum pump to the port A of vacuum pump. 3. Apply vacuum and make sure that vacuum exists at the port B .

Removal and Installation
VIAS CONTROL SOLENOID VALVE
Refer to EM-108, "INTAKE MANIFOLD" .

[QR25DE]
A

EC

C

D
PBIB2505E
E

F

G
H
PBIB2532E
I
J

K

L

PBIB0846E

M

UBS00JYX

Revision: December 2006

EC-1209

2006 Sentra

MIL AND DATA LINK CONNECTOR
MIL AND DATA LINK CONNECTOR Wiring Diagram

[QR25DE]
PFP:24814
UBS00JOD

Revision: December 2006

EC-1210

BBWA2272E
2006 Sentra

MIL AND DATA LINK CONNECTOR

[QR25DE]
A EC
C D E F G H I J K L M

Revision: December 2006

EC-1211

BBWA2263E
2006 Sentra

SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS) Fuel Pressure

[QR25DE]
PFP:00030
UBS00JZP

Fuel pressure at idle

Approximately 350 kPa (3.57kg/cm2 , 51psi)

Idle Speed and Ignition Timing

UBS00JZQ

Target idle speed

No-load* (in P or N position)

Air conditioner: ON

In P or N position

Ignition timing

In P or N position

*: Under the following conditions: G Air conditioner switch: OFF G Electric load: OFF (Lights, heater fan & rear window defogger) G Steering wheel: Kept in straight-ahead position

Calculated Load Value

700±50 rpm 800 rpm or more
15°±5° BTDC
UBS00JZR

At idle At 2,500 rpm

Calculated load value % (Using CONSULT-II or GST) 10 - 35 10 - 35

Mass Air Flow Sensor

UBS00JZS

Supply voltage

Battery voltage (11 - 14V)

Output voltage at idle

0.9 - 1.1V*

Mass air flow (Using CONSULT-II or GST)

1.0 - 4.0 g·m/sec at idle* 4.0 - 10.0 g·m/sec at 2,500 rpm*

*: Engine is warmed up to normal operating temperature and running under no-load.

Intake Air Temperature Sensor

UBS00JZT

25 (77) 80 (176)

Temperature °C (°F)

Resistance k 1.800 - 2.200 0.283 - 0.359

Engine Coolant Temperature Sensor

UBS00JZU

20 (68) 50 (122) 90 (194)

Temperature °C (°F)

Resistance k 2.1 - 2.9
0.68 - 1.00 0.236 - 0.260

Crankshaft Position Sensor (POS)
Refer to EC-915, "Component Inspection" .
Camshaft Position Sensor (PHASE)
Refer to EC-923, "Component Inspection" .
Air Fuel Ratio (A/F) Sensor 1 Heater

UBS00JZZ UBS00K00 UBS00JZW

Resistance [at 25°C (77°F)]

2.3 - 4.3

Heated Oxygen Sensor 2 Heater

UBS00JZX

Resistance [at 25°C (77°F)]

5.0 - 7.0

Throttle Control Motor

UBS00K01

Resistance [at 25°C (77°F)]

Approximately 1 - 15

Revision: December 2006

EC-1212

2006 Sentra

SERVICE DATA AND SPECIFICATIONS (SDS)

Fuel Injector
Resistance [at 10 - 60°C (50 - 140°F)]
Fuel Pump
Resistance [at 25°C (77°F)]

11.6 - 14.9 0.2 - 5.0

[QR25DE]
UBS00K02
A
UBS00K03
EC C D E F G H I J K L M

Revision: December 2006

EC-1213

2006 Sentra

SERVICE DATA AND SPECIFICATIONS (SDS)

[QR25DE]

Revision: December 2006

EC-1214

2006 Sentra