MDPS System A/S Workflow

* For detailed DTC or other DTC A/S procedures, see "MOTOR DRIVEN POWER STEERING DTCS ".

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1. Noise/malfunction Inspection 

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2. Warning lamp (DTC)/CAN Line error 

   2 - 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.

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      2. Check the motor connector.
         • Terminal Expansion and damage

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         NOTE:

         • Must be replaced the MDPS motor if occur terminal expansion and damage. (Refer to Motor Driven Power Steering - "MDPS POWERPACK ASSEMBLY  ")
      3. Remove the grommet (A) and then check the wiring on the TAS side (B) and ECU side (C).
         • Check for damage, push - back, or improper connection in each connector and wiring.

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         NOTE:

         • For DTC C125901/C125929/C125938/C129002, exchange MDPS wiring.

           (Refer to appropriate SYSTEM WIRING DIAGRAMS article.)

         • If problems are found during the MDPS wiring check, replace the MDPS column & housing. (Refer to Motor Driven Power Steering - "REPAIR PROCEDURES  ")

      2 - 2 Inspection Items Per DTC 

      * For detailed DTC or other DTC A/S procedures, see "MOTOR DRIVEN POWER STEERING DTCS ".

      DTC	Problem	First analysis method	How to repair
      C129002	Torque sensor signal error	First erase DTC,	When the sensor connector flows, the warning lamp reoccurs Replace the sensor cable, and replace the column & housing (56390)
      		check connector connection
      C125901	Steering angle signal error	Erase DTC after resetting Steering angle zero point
      C125929		check connector connection
      C125938
      C111201	Torque sensor power supply error	First erase DTC, check connector connection	When the sensor connector flows, the warning lamp reoccurs Replace the sensor cable, and replace the power pack (56370)
      C160404	ECU hardware error	Check after erasing the DTC	In case of reoccurrence, replace MDPS power pack (56370)
      C170401	Relay breaking of a wire
      C170504	ECU over/discharge error
      C241216	Motor circuit break/short
      C241262	Motor current error
      C241319	Over current error
      C241328	Motor electric current gate error
      C241396	Broken the motor current sensor
      C240162	Motor circuit error
      C126154	Steering angle zero point error	Check after resetting Steering angle zero point	Resetting Steering angle zero point or replace column & housing (56390)
      		Check sensor connector poor connect
      C161187	Not received the EMS CAN message	1. Check chassis CAN condition
      C161F64	Vehicle speed monitoring error	2. Check connector connection	Erase DTC (No MDPS replacement)
      C161F86	Vehicle speed signal error	3. Check engine ECU
      C161688	CAN BUS OFF	4. Start OFF history confirmation message while driving
      C162887	Not received the cluster CAN signal	2. Check cluster connector connection
      C163386	Cluster display vehicle speed error
      C169287	Not received the VSM message	Check ESC, check chassis CAN condition
      C169386	ESC signal error
      C171101	ECU abnormal end	Recheck after erasing the DTC
      C180487	Cannot be received the LKA message	Check LKA, check CAN line
      C180586	_KA signal error
      C181287	Not received the gateway CAN message	Check gateway
      C181786	Gateway CAN signal error

      (3) MDPS Performance Inspection 

      1. Inspect steering angle and DTCs relevant to the steering system.
      2. Inspection for heavy steering effort
         1. Inspect tire pressure and width.
         2. Check DTCs relevant to the CAN communication error.
         3. Check the wheel alignment.

      (4) MDPS common problems 

      Case 1	Case 2	Case 3
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      Multifunction switch noise	Clock spring noise	DAB/Wire noise
      Retighten the bolt	Replace clock spring	Rearrange and replace DAB

      Case 4	Case 5	Case 6
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      Multifunction switch noise	M8 nut mount defect	M10 nut mount defect
      Replace multifunction switch	Retighten nut	Retighten nut

      Case 7	Case 8
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      Cowl top bolt mount defect	Cowl bar nut mount defect
      Retighten cowl top bolt	Replace clock spring

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

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