M939 INFOCENTER

INTRODUCTION

The INFO CENTER is a diagnostic tool used for readout of fault codes as well as other information available in the ABS Electronic Control Unit (ECU). The INFO CENTER is connected to the ABS diagnostic connector. While the ABS is powered, information is transferred to the Infocenter.

Functions:

• Diagnostics: OK 07 if No Fault Codes, Current Fault Code, Stored Fault Codes, Sensor Check – Wheel Speed Bars and Sensor Location
• ABS ECU Information: Serial Number, Product Code (80 19 01), System Configuration (2S2C C1)

INSTRUCTIONS

Press the functions buttons once only. Some functions require a 2 sec. button hold when a COMFAIL message appears; check ABS diagnostic connection and press either button again.

DISPLAY LEGENDS

• Flashing = ABS Communications
• Flashing = Current ABS Fault

Units displayed: °F °C lb kg mile km bar psi

PRODUCT IDENTIFICATION and CONFIGURATION

ABS Product Type: 24V ABS M939, 2S/2M System.

Configuration Code:

Power Up Information

Image of the Haldex INFOCENTER device, a black and blue handheld unit with a digital display showing segmented characters and the Haldex Brake Systems logo.

The first screen displays an all Segment Display Test.

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Next screen displays ABS Sensor/Valve Configuration. Example: 2S2C C1 = (2Sensors/2 Valves).

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Powers up to an 07 code: Vehicle is Stationary. ABS is fully operational. If vehicle ABS Lamp is still On, check stored faults. (See page 2).

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Or Powers up to a Fault Code: The display will power up to the Active Fault Code. (See pages 5-7 for complete fault code list).

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If COMFAIL is displayed, it indicates a communication failure between ECU and the INFOCENTER. Check connection at diagnostic plug for damage.

Diagnostic Mode: View/Clear Stored Faults

From the Active Fault screen, “OK 07”, Vehicle is Stationary, ABS is Fully Operational.

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Hold Right Button 2 sec. until “BUSY” is Displayed.

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The First Stored Fault is Displayed. Example: “Yedu 69” Fault.

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Repeat Right Button Hold for next Stored Fault. Example: “YEXA 63” Fault.

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Repeat Right Button Hold for next Stored Fault. Example: “S2A 03” Fault.

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Repeat Right Button Hold until “CLR CA” is Displayed. If more than 5 faults are stored, wait for the 6th fault, repeat right button holds to view next 5.

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Repeat Right Button Hold to Clear Stored fault Codes. Otherwise, wait to return to the Active Fault Screen.

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After Clearing Stored Faults, the Display Returns to the Active Fault Screen.

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If display is other than 07, reference pages 5-7. Repair, re-power and clear stored faults again.

Wheel Speed Sensor Output Test

From the Active Fault screen, Code 07, Vehicle is Stationary, ABS Fully Operational.

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Press the Right Button to Display “WHL”.

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Rotate the Wheel with Sensor 2A (1 rev/ 2 sec) 4 sec min. S2A will remain Displayed.

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Rotate the Wheel with Sensor 2B (1 rev/ 2 sec) 4 sec min. 2B will remain Displayed.

Note:

Upon Rotation of a wheel, the sensor location is displayed. The display will remain on until rotation of another wheel. If NO Sensor is displayed, verify sensor connection and sensor to exciter alignment.

ABS Configuration

2 Sensors / 2 Modulator Valves (2S2C)

Sensor Location

2A 2B

Sensor Locations:

• Drivers Side of Vehicle: Sensor 2A
• Passenger side of Vehicle: Sensor 2B

View ABS Information

From the Active Fault screen, Code 07, Vehicle is Stationary. ABS Fully Operational.

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Press the Right Button to Display “WHL”.

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Press the Right Button again to Display the ECU Serial Number. Example: 11715360.

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Press the Left Button To view Product Type. (80 19 01) 19 references M939.

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Press the Left Button Again to view Sensor/Valve ABS Config. 2S2C C1 (2 Sensors/2 Valves).

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Press the Left Button Again to View InfoCenter Software Version.

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Press the Left Button Again To View Segment Display Test.

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Press Left Button Again to return to ECU Serial Number.

Diagnostic Fault Code List

BLANK DISPLAY

No power to ABS and/or Infocenter.

Possible causes: Fuse blown. InfoCenter or cable fault. Open Circuit B-. Poor connection at diagnostic plug.

SENSOR BAR

Bar displayed = Sensor output O.K.

Bar not displayed = Sensor output too low. Check sensor gap.

System Status Codes:

• OK 00: System is O.K., vehicle is moving.
• OK 07: System is O.K., vehicle is stationary.

OPEN OR SHORT SENSOR OUTPUT GROUP

Possible causes: Sensor failure, sensor wiring open or short circuit. Sensor resistance should be 980 – 2350 ohms. Verify Wire Ties on sensor cables connected to air hose are not too tight. Excessive grease may prevent secure sensor connections.

• S2A 03: 2A Sensor/wiring open or short circuit.
• S2B 04: 2B Sensor/wiring open or short circuit.

LOW SENSOR OUTPUT GROUP

Possible causes: Sensor worn, maladjusted sensor, wiring open or short circuit. Wheel bearing failure or adjustment. Verify Wire Ties on sensor cables connected to air hoses are not too tight. Excessive grease may prevent secure sensor connections.

• S2A 13: 2A Sensor system fault.
• S2B 14: 2B Sensor system fault.

EXC 20

Incorrect exciter type.

Possible causes: Unequal Exciter tooth count on hubs.

(These faults can only be created when the vehicle speed is greater than 6 MPH).

INTERMITTENT LOW SENSOR OUTPUT GROUP

Possible causes: Loose sensor, connection, bracket or exciter. Damaged exciter. Maladjusted sensor or worn sensor cable insulation. Wheel bearing failure or adjustment. Verify Wire Ties on sensor cables connected to airlines are not too tight. Excessive grease may prevent secure sensor connections. Inspect exciter ring for damage.

• S2A 23: 2A Sensor system fault.
• S2B 24: 2B Sensor system fault.

(These faults can only be created when the vehicle speed is greater than 6 MPH).

Diagnostic Fault Code List (Continued)

ONE WHEEL WITH SLOW RECOVERY GROUP

Possible causes: Slow brake release, foundation brake mechanical faults, dry bearings, broken spring, restricted piping. Modulator fault. Check for kinks and blockages etc. Incorrect piping, wiring. Inspect exciter ring for damage. Failed Primary Reservoir.

• XSEN 40: Sensor wiring crossed across an axle.
• SLW 42: Slow recovery, blue channel.
• SLW 43: Slow recovery, yellow channel.

MODULATOR SOLENOID WIRING OR SOLENOID OPEN CIRCUIT GROUP

Possible causes: Modulator Valve solenoid failure, solenoid connection, or valve cable damage. Verify Cable Continuity between Valve to ECU connections. Verify Valve Solenoid resistance is 16 Ohms.

• BUHd 62: Hold solenoid, blue channel.
• YEHd 63: Hold solenoid, yellow channel.
• BUDU 68: Dump solenoid, blue channel.
• YEDU 69: Dump solenoid, yellow channel.

MODULATOR SOLENOID WIRING OR SOLENOID SHORT TO B- GROUP

Possible causes: Modulator Valve solenoid failure or valve cable damage. Verify Cable Continuity between Valve and ECU connections. Verify Valve Solenoid resistance is 16 Ohms.

• BUHd 72: Hold solenoid, blue channel.
• YEHd 73: Hold solenoid, yellow channel.
• BUDU 78: Dump solenoid, blue channel.
• YEDU 79: Dump solenoid, yellow channel.

MODULATOR SOLENOID WIRING OR SOLENOID SHORT TO B+ GROUP

Possible causes: Modulator Valve solenoid failure or valve cable damage. Verify Cable Continuity between Valve and ECU connections. Verify Valve Solenoid Resistance is 16 Ohms.

• SOL 80: Poor insulation in the modulator solenoid or wiring fault.
• BUHd 82: Hold solenoid, blue channel.
• YEHd 83: Hold solenoid, yellow channel.
• BUDU 88: Dump solenoid, blue channel.

Diagram illustrating solenoid resistance values: 16 Ohms, 16 Ohms, 32 Ohms.

Diagnostic Fault Code List (Continued)

SUPPLY VOLTAGE GROUP

Possible causes: Verify +24V dc power source. Do not use battery charger as power supply. If a 90 or 92 fault is active, correct the power problem and re-power the ABS before addressing other faults.

• B+LO 90: Supply voltage at ECU less than 21V when a solenoid is energized.
• ISO1 91: Faulty supply or 15Amp fuse blown (Incorrect power switch sequence).
• B+HI 92: Supply voltage at the ECU greater than 33V.
• CF: Sensors and Solenoid not connected. Alternating with code 90 (incomplete solenoid function). Check ECU supply voltage.

VARIOUS CODES

• LAMP 0E: ABS Warning Lamp. Possible causes: ABS Warning Lamp Relay Open or short circuit.
• 2S2C C1: ABS Configuration (2 Sensors and 2 Modulator Valves).
• ECU 93, ECU 99, E (0-F): Internal ECU fault. Possible causes: ECU failure.
• CLR CA: Erase stored faults.
• CLR CC: Clear Configuration.
• COM FAIL: Communication failure between ECU and INFOCENTER (Press either button to re-establish communications).

Contact Information

Haldex Brake Systems

North American Headquarters

10930 N.Pomona Ave.
Kansas City, MO 64153-1297
Tel: 816-891-2470
Fax: 816-891-9447
www.haldexbrakes.com

Haldex Brake Systems

North American Sales Division

10707 NW Airworld Drive
Kansas City, MO 64153-1215
Tel: 816-891-2470
Fax: 816-880-9766
www.hbsna.com

ABS Technical Support

Tel: 800-643-2374