VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1203

DTC Code DTC Name
C1203 ECM Communication Circuit Malfunction

DESCRIPTION

This circuit is used to send TRC and VSC control information from the skid control ECU (brake actuator assembly) to the ECM, and engine control information from the ECM to the skid control ECU (brake actuator assembly) via CAN communication.

DTC No. DTC Detection Condition Trouble Area
C1203

Any of the following is detected:


  1. Engine model information sent from the ECM does not match the information stored in the skid control ECU.

  2. No system information stored in the skid control ECU.

  3. Incorrect installation of the skid control ECU or ECM.

  • ECM malfunction or ECM with incorrect part number installed

  • Skid control ECU (brake actuator assembly)

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information Click here.

PROCEDURE


  1. CHECK PART NUMBER (ECM)


    1. Check that the proper ECM is installed.

      Result
      Result Proceed to
      Proper ECM is installed. A
      Proper ECM are not installed (for 2AR-FE). B
      Proper ECM are not installed (for 2GR-FE). C
      Proper ECM are not installed (for 6AR-FSE). D

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

    A

  2. CHECK BRAKE ACTUATOR ASSEMBLY


    1. Check if the skid control ECU (brake actuator assembly) had been replaced before the DTC was recorded.

      Result
      Result Proceed to
      The skid control ECU (brake actuator assembly) is not replaced. A
      The skid control ECU (brake actuator assembly) is replaced. B

    B

    PERFORM INITIALIZATION AND CALIBRATION Click here

    A

  3. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the engine switch off.

    3. Turn the engine switch on (IG).

    4. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC C1203 is not output. A
      DTC C1203 is output. B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  4. PERFORM INITIALIZATION AND CALIBRATION


    1. Perform initialization and calibration Click here.


    NEXT

  5. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the engine switch off.

    3. Turn the engine switch on (IG).

    4. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC C1203 is not output. A
      DTC C1203 is output. B

    A

    END

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here