VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1203

DTC Code DTC Name
C1203 ECM Communication Circuit Malfunction

DESCRIPTION

This circuit is used to send 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) through the CAN communication system.

DTC Code DTC Detection Condition Trouble Area
C1203 The engine, drivetrain and destination variations that are sent from the ECM do not match the ones of the skid control ECU. ECM

INSPECTION PROCEDURE

PROCEDURE


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


    1. Check that the proper ECM and brake actuator assembly are installed.

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

    B

    REPLACE ECUS WITH PROPER ONES

    A

  2. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Turn the ignition switch off.

    3. Check if the same DTC is output.

      Tech Tips

      Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

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

      Tech Tips

      Refer to the ECM removal procedures:
      Item See page
      1KD-FTV except DPF

      Click here

      for DPF

      Click here

      2KD-FTV except DPF

      Click here

      for DPF

      Click here

      1GR-FE

      Click here


    B

    REPLACE ECM

    A

    USE SIMULATION METHOD TO CHECK Click here