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Technical Service Bulletin

PARTIAL REPAIR OF C-MDPS MOTOR, ECU, WORM GEAR AND/OR STEERING COLUMN HOUSING

GROUP: CHA

NUMBER: 084 (Rev 6, 11/25/2020)

MODEL: All Applicable Models with C-MDPS

DATE: November 2018

Introduction

* NOTICE

This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area.

This bulletin provides information regarding the partial repair of the Motor Driven Power Steering (MDPS) Motor, Electronic Control Unit (ECU), Worm Gear Assembly or Steering Column Housing on some 2010MY~ Kia models listed on page 8, equipped with a Column Motor Driven Power Steering (C-MDPS) unit. Follow the MDPS Flowchart (page 2) along with the MDPS DTC Table (page 3) procedure outlined in this bulletin before replacing the C-MDPS Motor, ECU, Worm Gear Assembly or Steering Column Housing.

* NOTICE

  • MDPS Repair Flowchart and Common Noise Flowchart are meant to be used as a reference guide only. See MDPS DTC table for more details.
  • Note that some DTC(s) may be found in systems other than Electric Power Steering (EPS) in KDS. They may be found in the Brake/ABS/ESC system. Check all systems for DTC(s).
  • Replacing the complete C-MDPS Steering Column Assembly is NOT allowed when the components failure is identified in the flowchart. In addition, replacing the Steering Column Housing is NOT allowed when the problem source is the C-MDPS Worm Gear Assembly (for applicable models).

Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

Circulate To:

  • ✔️ General Manager
  • ✔️ Service Advisors
  • ✔️ Technicians
  • ✔️ Service Manager
  • ✔️ Body Shop Manager
  • ✔️ Fleet Repair
  • ✔️ Parts Manager

MDPS Repair Flowchart

Flowchart Start: Vehicle in for MDPS related complaint.

  • NOISE: Refer to C-MDPS Common Noise Concerns flowchart on page 3. C-MDPS Worm Gear* replacement, page 6. (*Mobis C-MDPS only).
  • MIL is ON: DTC(s) Present / CAN Line Error. See DTC Table on page 4.
  • NO MIL: No DTC(s) Present Sticking/Binding. Refer to CHA060 TSB.

Common Diagnostic Steps:

  • Check MDPS connectors and wiring.
  • Erase DTC(s) and re-check.
  • If DTC(s) are still present, follow the recommended repair per DTC stored.

Component Related DTCs:

  • ECU Related: C1112, C1604, C1623, C1687, C1688, C1704, C1705, C2412, C2413
  • Motor Related: C2400, C2401
  • Column and Housing Related: C1259, C1290
  • Connectors/Wiring Related: C1260, C1261, C1611, C1612, C1616, C1622, C1628, C1646, C1656, C1692, C1693, C1696, C1697

Action for Column and Housing: Replace the Column and Housing Assy.

Action for ECU: Replace the MDPS ECU.

Action for Motor: Replace the MDPS Motor.

Final Check: Check DTC(s) and Wiring at HECU/MDPS/EMS:

  • Check connectors for poor connection.
  • Check for connector corrosion.
  • Check for connector damage or deformation.
  • Check the DTC Diagnostic Guide on KGIS.

C-MDPS Common Noise Concerns Flowchart

C-MDPS Noise Inspection Steps:

  1. Check Steering Wheel: Inspect the condition of the (Driver's Air bag) DAB wiring (e.g., DAB, clock spring, multifunction switch-MFS). If no problem found, proceed to step 2. If a problem is found, 'Replace defective part'.
  2. Check the C-MDPS Mounting Position: Inspect cowl mounting and cross member bolt, inspect C-MDPS mounting bolts. If no problem found, proceed to step 3. If a problem is found, 'Retighten bolt'.
  3. Check U-Joint Mounting Bolt: Inspect U-joint retaining bolt, check for noise after disassembling/re-assembling. If no problem found, proceed to step 4. If a problem is found, 'Retighten U-joint bolt'.
  4. Check Tire-Rod End Joint for Free Play: If no problem found, proceed to step 5. If a problem is found, 'Replace defective part'.
  5. Check Steering Gear box Mounting Bolt: If no problem found, proceed to step 6. If a problem is found, 'Retighten bolt'.
  6. Check Steering Gear Box Noise: If no problem found, proceed to step 7. If a problem is found, 'Replace defective part'.
  7. Check C-MDPS Noise: Assess noise source from the column and housing, C-MDPS motor, or C-MDPS Worm Shaft Bearing. If noise is present, 'Replace defective part: C-MDPS Worm Gear assembly or Steering Column and Housing or C-MDPS Motor assembly'.

Diagram Descriptions:

  • Illustration of steering wheel components including the Driver's Air Bag (DAB) module, clock spring, and multifunction switch (MFS).
  • Diagram showing the C-MDPS mounting points.
  • Illustration of the U-joint assembly in the steering column.
  • Illustration of a tie-rod end joint.
  • View of the steering gear box.
  • Close-up of the worm gear mechanism.
  • Image of the C-MDPS motor unit.
  • Illustration of the complete steering column and housing assembly.

Video: Worm Shaft Bearing Noise (Applicable Models Only: Mobis C-MDPS)

MDPS DTC TABLE

DTC Concern Inspection Procedure Recommendation
C1102 Battery Voltage Problem Check battery voltage condition. Recharge battery voltage.
C1603 MDPS Thermal Protection Investigate driving conditions if DTC is set. This DTC protects the motor from overheating. No replacement necessary.
C1611, C1616, C1622, C1696, C1697, C1612, C1646, C1628, C1656, C1692, C1693 CAN Time Out EMS, CAN BUS OFF, Vehicle Speed Signal Error, SPAS Signal Error Check GDS condition. Check wiring and connector condition. Check ECU CAN line. Check MDPS ground. Check SPAS and associated wiring. Check EMS Can line. Check the chassis CAN line. Check the EMS
C1826, C1688 TCU Signal Error, Instrument Cluster Signal Error, VSM Signal Error Check TCU and associated wiring. Check instrument cluster and Associated wiring. Check VSM and associated wiring. Repair as necessary. Erase DTC(s). MDPS Assy is not to be replaced.
C1259, C1260, C1261, C1290 Steering Angle Sensor Signal Error, Steering Angle Sensor Signal Error, Zero-Setting Error Reset steering angle sensor calibration and erase DTC(s). Check wiring and connector condition. Reset steering angle sensor calibration. If DTC returns, replace column and housing assembly. If DTC returns, inspect wiring and connector condition.
C1112 Torque Sensor Error First, erase DTC, then check wiring And connector condition. If DTC returns, replace column And housing assembly.
C1704 Torque Sensor Voltage Error Check wiring and connector condition Between torque sensor and ECU. If DTC returns, replace the MDPS ECU.
C1705 ECU Fail-Safe Relay Fault First, erase DTC. If DTC returns, replace the MDPS ECU.
C1604 ECU Hardware Error, ECU Over/Discharge Error Then check the wiring and connector at the ECU. If DTC returns, replace the MDPS motor.
C2413 ECU Hardware Error First, erase DTC. Then check the wiring and connector between the ECU and motor. First replace MDPS ECU. If DTC returns, replace the MDPS motor.
C2400, C2401 Motor Signal Error, Motor Circuit Error 1. Check MDPS power connector and fuse. 2. Check MDPS ground line. 3. Check MDPS ECU/VSM CAN line. 4. Check communication status with GDS. 5. Check for DTC C1259. If present, replace the column and housing assembly. If DTC returns, replace the MDPS ECU. If DTC returns and MDPS is inoperable, replace MDPS ECU. If DTC returns and MDPS operation is normal, continue investigation into wiring issues.
C2412 Motor Voltage Supply Error (See C2400/C2401 inspection procedure) (See C2400/C2401 recommendation)
C1623 CAN Time Out SAS 1. Check MDPS power connector and fuse. 2. Check MDPS ground line. 3. Check MDPS ECU/VSM CAN line. 4. Check communication status with GDS. 5. Check for DTC C1259. If present, replace the column and housing assembly. If DTC returns, replace the MDPS ECU.
C1687 CAN Time Out VSM (See C1623 inspection procedure) (See C1623 recommendation)
C1688 VSM Signal Error (See C1623 inspection procedure) (See C1623 recommendation)

Replacement Procedures

Replacement Procedure for MDPS Motor

Replace the MDPS motor by referring to the "Steering System → Motor Driven Power Steering → MDPS Motor → Repair Procedures" chapter in the applicable Shop Manual on KGIS.

Note: Be sure to mark the steering column shaft to the intermediate shaft for re-assembly purposes if removing the steering column and housing assembly.

Replacement Procedure for MDPS ECU

Replace the MDPS ECU by referring to the "Steering System → Motor Driven Power Steering → MDPS ECU → Repair Procedures" chapter in the applicable Shop Manual on KGIS.

Note: Be sure to mark the steering column shaft to the intermediate shaft for re-assembly purposes if removing the steering column and housing assembly.

Replacement Procedure for Steering Column & Housing

Replace the MDPS column and housing by referring to the "Steering System → Motor Driven Power Steering → MDPS Column and Housing → Repair Procedures" chapter in the applicable Shop Manual on KGIS.

Note: Be sure to mark the steering column shaft to the intermediate shaft for re-assembly purposes.

* IMPORTANT

Ensure all steps are closely followed within the Service information as additional KDS-related procedures are required. Ensure the Steering Angle Sensor (SAS) is calibrated and there are no DTCs after replacement of the MDPS Motor and/or ECU. Verify proper operation of the steering system and vehicle.

Replacement Procedure for Worm Gear Assembly (Mobis Only)

  1. Remove the MDPS column and housing by referring to the "Steering System → Motor Driven Power Steering → MDPS Column and Housing → Repair Procedures" chapter in the applicable Shop Manual on KGIS. Note: Be sure to mark the steering column shaft to the intermediate shaft for re-assembly purposes.
  2. Using the worm shaft plug SST (B), loosen the worm shaft nut (C) and remove the worm shaft.

Torque Specifications for nut (C) (Refer to page 8 for applicable model):

  • 0K563 T9100FFF (34.9mm): 27.5 – 34.7 lb.ft (37.2 – 47.0 N.m (3.8 – 4.8 kgf·m)
  • 0K563 Q2100FFF (42.0mm): 51.7 – 59.0 lb.ft (70.0 – 80.0 N.m (7.2 – 8.2 kgf.m)
  • 0K563 D6100FFF (44.9mm): 81.2 – 103.2 lb.ft (110.0 – 140.0 N.m (11.3 – 14.3 kgf.m)
  1. Loosen the 5mm hex plug (D) and then remove the anti-rattle plug assembly.

Torque Specifications for plug (D): 7.3 - 9.4 lb.ft (9.8 - 12.8 N.m, 1.0 - 1.3 kgf.m)

Diagram Descriptions:

  • Diagram (A) showing the C-MDPS column and housing assembly with labeled points for removal.
  • Illustration (B) of the Special Service Tool (SST) used for loosening the worm shaft nut.
  • Close-up (C) of the worm shaft nut.
  • Illustration (D) of the 5mm hex plug for the anti-rattle plug assembly.
  1. Using a set of vise grips, remove the worm shaft assembly (E). Note: Reuse the flexible coupling unless there is visible damage or wear. Replace as needed.
  2. Apply grease to worm gear shaft (E) portion only (OK). Grease should not be applied to the bearing (NG). Note: Grease is included (20g) with worm gear assembly.
  3. Install the new worm shaft assembly (E) in the reverse order of removal.
  4. Using a torque wrench and SST (B), tighten the shaft nut (C). Refer to torque specifications on step 2.
  5. Re-install all removed parts in the reverse order of removal. Note: Be sure to follow the SAS Calibration, EPS Type Recognition as outlined on KGIS.

Diagram Descriptions:

  • Image (E) showing the worm shaft assembly being removed or installed, with grease application points indicated.
  • Diagram illustrating correct (OK) and incorrect (NG) grease application on the worm gear shaft and bearing.

Affected Vehicles and Parts

Affected Vehicle Range

Model MDPS Supplier Model Year Range
Soul (AM), Optima (QF, TF, TF HEV), Cadenza (VG), and Forte (YD, YDm) Mobis All Applicable Models 2010MY~ with C-MDPS
Forte (BD, BDm, YD, YDm), Niro (DE, DE HEV/PHEV/ EV), Optima (JF/JFa, JF HEV/PHEV) Soul (PS, PS EV), Sorento (UMa) and Cadenza (YG) Mobis All Applicable Models 2010MY~ with C-MDPS
Rio (UB, SC), Sportage (SL, QL) and Sorento (XMa) Mando All Applicable Models 2010MY~ with C-MDPS

Required Part

Part Name Part Number Figure
C-MDPS Motor Refer to EPC Illustration of the C-MDPS Motor.
C-MDPS ECU Refer to EPC Illustration of the C-MDPS ECU.
Steering Column Housing Refer to EPC Illustration of the Steering Column Housing.

Required Tool and Worm Gear P/N (Includes Grease)

Model/ Model Year MDPS Assy Worm Shaft Kit Part Number SST Part Number (Size) Image
2017-2018 YD(m)
2018-2019 PS/PS EV		 56351 B3AAA FFF 0K563 T9100FFF (34.9mm) (Non-Integrated) Image of a worm gear kit (Non-Integrated).
2017-2018 JFa/UMa
2017 JF HEV
2019-2020 JFa, UMa
2018-2020 JF HEV
2017-2020 YG		 Refer to EPC 56351 C5AAA FFF
56351 F6AAAFFF		 0K563 D6100FFF (44.9mm) Image of a worm gear kit.
2017 DE
See Note Below*		 56310-G5100
56310-G5300		 56351 F2AAAFFF 0K563 Q2100FFF (42mm) (Integrated) Image of a worm gear kit (Integrated).
2019-2020 BD(m)
2017 DE
See Note Below*		 Refer to EPC 56310-G5101
56310-G5301		 56351 G3AAAFFF
2018-2020 DE/DE EV/
DE PHEV		 Refer to EPC

*Note: DE requires the reference to MDPS assembly to ensure the proper part is installed; Integrated vs. Non-Integrated.

Warranty Information

Warranty Information (Motor, ECU, Steering Column Housing)

N Code: D61 C Code: ZZ4

Model Claim Type Causal P/N Qty. Repair Description Labor Op Code Op Time Replacement P/N Qty.
All Models Listed W Refer to EPC 1 C-MDPS Motor Replacement 56330R00
56331R00		 Refer to LTS N/A 0
All Models Listed W Refer to EPC 1 C-MDPS ECU Replacement 56345R00 Refer to LTS
All Models Listed W Refer to EPC 1 Steering Column Housing Replacement 56391R00 Refer to LTS

Warranty Information (Worm Gear)

N Code: Q55 C Code: ZZ1

Model Claim Type Causal P/N Qty. Repair Description Labor Op Code Op Time Replacement P/N Qty.
PS, PS EV, YD W *Refer to EPC 0 C-MDPS Worm Gear Replacement (for applicable models only) 56351F01 1.4 M/H 56351 B3AAAFFF 1
JF, JF HEV, JFa, UMa W *Refer to EPC 0 C-MDPS Worm Gear Replacement (for applicable models only) 56351F01 1.3 M/H 56351 C5AAAFFF 1
DE W *Refer to EPC 0 C-MDPS Worm Gear Replacement (for applicable models only) 56351F01 1.1 M/H 56351 F2AAAFFF 1
JF, JF HEV, JFa, UMa, YG W *Refer to EPC 0 C-MDPS Worm Gear Replacement (for applicable models only) 56351F01 1.3 M/H 56351 F6AAAFFF 1
BD, BDm, DE, DE PHEV, DE EV W *Refer to EPC 0 C-MDPS Worm Gear Replacement (for applicable models only) 56351F01 1.1 M/H 56351 G3AAAFFF 1

*Note: Refer to EPC for Steering Column and Housing Assembly.

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