VEHICLE STABILITY CONTROL SYSTEM(for TMC Made), Diagnostic DTC:C1203

DTC Code DTC Name
C1203 ECM Communication Circuit Malfunction

DESCRIPTION

The 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 or main body ECU (multiplex network body ECU) to the skid control ECU (brake actuator assembly) through the CAN communication system.

DTC No. DTC Detection Condition Trouble Area
C1203 Engine, drive source and destination variations that are sent from the ECM or main body ECU (multiplex network body ECU) do not match the ones of the skid control ECU (brake actuator assembly).

  • ECM

  • Main body ECU (Multiplex network body ECU)

  • Skid control ECU (Brake actuator assembly)

PROCEDURE


  1. CHECK PART NUMBER (ECM AND BRAKE ACTUATOR ASSEMBLY)


    1. Check that the proper ECM is installed.

      Result
      Result Proceed to
      Proper ECM is installed A
      Proper ECM are not installed (for 1KR-FE) B
      Proper ECM are not installed (for 1NR-FE) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

  2. CHECK PART NUMBER (MAIN BODY ECU AND BRAKE ACTUATOR ASSEMBLY)


    1. Check that the proper main body ECU (multiplex network body ECU) is installed.

      Result
      Result Proceed to
      Proper ECU is installed A
      Proper ECU is not installed B

    B

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    A

  3. CHECK BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)


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

      Result
      Result Proceed to
      The brake actuator assembly is not replaced A
      The brake actuator assembly is replaced B

    B

    PERFORM INITIALIZATION AND CALIBRATION Click here

    A

  4. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  5. PERFORM INITIALIZATION AND CALIBRATION


    1. Perform initialization and calibration Click here.


    NEXT

  6. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

    A

    END

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here