ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1203

DTC Code DTC Name
C1203 ECM Communication Circuit Malfunction

DESCRIPTION

The circuit is used to send vehicle information from the main body ECU (multiplex network body ECU) to the brake actuator assembly (skid control ECU) through the CAN communication system.

DTC Code DTC Detection Condition Trouble Area
C1203 Information on whether right-or left-hand drive vehicles and destination variations that are sent from the main body ECU (multiplex network body ECM) do not match the ones of the brake actuator assembly (skid control ECU).

  • Main body ECU (Multiplex network body ECU)

  • Brake actuator assembly (Skid control ECU)

CAUTION / NOTICE / HINT

Note


  • When replacing the brake actuator assembly (skid control ECU) or deceleration sensor, be sure to perform deceleration sensor 0 point calibration and CVT oil pressure calibration after performing AT/CVT learned values initialization.

    for K310 Click here

    for K411 Click here

  • Perform the test mode procedure after the initialization (perform the test mode start only after the brake actuator assembly (skid control ECU) is replaced).

    Tech Tips

    By performing the test mode start, the identification code of the brake actuator assembly (skid control ECU) is re-registered.

PROCEDURE


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


    1. Check that the proper main body ECU (multiplex network body ECU) and brake actuator assembly (skid control ECU) are installed.

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

    A

    REPLACE ECUS WITH PROPER ONES

    B

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