LANE-KEEPING ASSIST SYSTEM, Diagnostic DTC:C1A71

DTC Code DTC Name
C1A71 Power Steering Control Torque

DESCRIPTION

When the driving support ECU receives a malfunction signal from the power steering ECU, DTC C1A71 is stored.

DTC Code DTC Detection Condition Trouble Area
C1A71

  1. Vehicle is being driven at speed of approximately 50 km/h (31 mph) or more and lane keeping assist main switch is on

  2. Power steering ECU sends flag indicating malfunction when it detects malfunction in torque request signal from driving support ECU

  • Power steering system

  • Driving support ECU

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC (POWER STEERING SYSTEM)


    1. Check for DTCs Click here.

      OK
      Power steering system DTCs are not output.

    NG

    GO TO POWER STEERING SYSTEM Click here

    OK

  2. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Make sure the following conditions are met:

      Tech Tips

      If the detection conditions are not met, the system cannot detect malfunctions.


      • Lane keeping assist system:

        The vehicle is being driven at a speed of approximately 50 km/h (31 mph) or more and the lane-keeping assist main switch is on.

    3. Check for DTCs Click here.

      OK
      DTC C1A71 is not output.

    NG

    REPLACE DRIVING SUPPORT ECU Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  3. REPLACE DRIVING SUPPORT ECU


    1. Replace the driving support ECU with a new one Click here.

      Note

      When replacing the driving support ECU, always replace it with a new one and be sure to perform initialization Click here. If an ECU which was installed to another vehicle is used, the information stored in the ECU will not match the information from the vehicle, and as a result, a DTC may be stored.


    NEXT

  4. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Make sure the following conditions are met:

      Tech Tips

      If the detection conditions are not met, the system cannot detect malfunctions.


      • Lane keeping assist system:

        The vehicle is being driven at a speed of approximately 50 km/h (31 mph) or more and the lane-keeping assist main switch is on.

    3. Check for DTCs Click here.

      OK
      DTC C1A71 is not output.

    NG

    REPLACE POWER STEERING ECU Click here

    OK

    END (DRIVING SUPPORT ECU IS DEFECTIVE)