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MDPS Performance Inspection

(1) Checking Connectors and Wiring 

  1. Checking Connectors and Wiring.

    Check for damage, push-back, or improper connection in each connector and wiring.

    1. Check the wiring on the vehicle side.
      • Check for open/short - circuit due to faulty connection, damage, or foreign substance.
G13310994Courtesy of KIA MOTORS AMERICA, INC.
Type Pin No Description
MDPS power connector 1 Battery +
2 Battery -
Vehicle connector 1 IGN
2 -
3 -
4 -
5 -
6 -
7 HIGH CAN
8 LOW CAN
Torque & Angle sensor connector 1 Torque sensor 2
2 -
3 -
4 Sensor power 3
5 Sensor power 2
6 Sensor power 1
7 Ground 1
8 Torque sensor 1
9 Ground 2
10 Sensor angle

(2) Inspection Items per DTC 

Item DTC Description Inspection Service action
CAN Line C1611 CAN TIME OUT EMS
  1. Check the GDS
  2. Check connector tightening.
  3. Inspection the ECU CAN connector
  4. Check MDPS vehicle grounding status
 EMS CAN line inspection
C1616 CAN BUS OFF Check the chassis can line
C1622 Vehicle speed signal error EMS(Engine ECU) inspection
Torque sensor C1290 Torque sensor signal error Inspection after DTC clear.
Check connector tightening.		 Replace MDPS assembly if phenomenon persists
C1112 Torque sensor supply voltage error Check torque sensor and ECU connection connector.
ECU C1604 ECU hardware error Inspection the ECU connector after Clear DTC
ECU C1705 EPS Module pre-charge circuit malfunction Inspection the ECU connector after Clear DTC.
Motor C2400 Motor signal error Inspection the Motor connector after Clear DTC.
Motor C2401 Motor position sensor error Inspection the Motor connector after Clear DTC.
ECU/Motor C2412 Motor current error Inspection the Motor/ECU connector after Clear DTC.
Steering angle sensor C1259 Steering Angle sensor error Steering angle reset after DTC clear
Check connector tightening.
Battery C1102 Battery voltage low Check battery voltage status Battery voltage charging
Cooperative control C1696 SPAS signal error SPAS Inspection Clear DTC.
C1697
Cooperative control C1612 TCU signal error TCU Inspection Clear DTC.
C1646
Cooperative control C1628 Cluster signal error Cluster Inspection Clear DTC.
C1656
Cooperative control C1692 VSM signal error VSM Inspection Clear DTC.
C1693
ABS C1260 Steering angle signal error Checking after steering angle reset
If the C1259 code does not occur, check the CAN line.		 Steering angle reset Clear DTC.

Noise/malfunction Repair procedures 

(3) Noise/malfunction Inspection 

Symptom Fault description and inspection method Countermeasure
Noise/rattle 1. Noise generated near the MDPS column & housing.
  • Remove the surrounding parts and check whether the same noise occurs.
 Replace the MDPS assembly
Noise/rattle 1. Check the handle and surrounding fastening parts.
  • Check DAB wiring arrangement, DAB, clock spring, multi-function switch, etc.
 Check the noise of the relevant part
  • Perform a separate inspection.
2. Check where the C-MDPS is installed.
  • Loosen the cowl fastening bolt and reassemble.

    (including the through bolt fixing the lower part of the C-MDPS)

 Check the installation of the cowl
3. Check the fastening area of the universal joint bolt.
  • Completely remove the universal joint and check whether the noise occurs after the reinstallation.
 Fasten with a new bolt if the universal joint bolt is worn
4. Check free playing area of the column when steering while the vehicle is stopped.
  • Check the main wiring connected to the MDPS and column/interference around the shroud/friction
 Keep spaces between the surrounding parts
  • Check freeplay around the wiring and column and inspect interference.

(4) Cautions to be taken while servicing 

Cautions to be taken when handling the MDPS (Motor Driven Power Steering) 

  1. Failure occurs due to internal damage because of the drop of and shock and excessive external force on the new component.
    • → Be cautious of shock on the component and replace the damaged part (due to drop, etc.) with a new one.
  2. When fastening the steering, excessive impact may result in twisting the center point of the torque sensor.
  3. When removing/installing the connector the wiring may be damaged (deformed) by excessive external force.
  4. Be cautious when storing and replacing the components under the abnormal temperature and humidity conditions.
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