VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1203, C1270

DTC Code DTC Name
C1203 ECM Communication Circuit Malfunction
C1270 Initialization Incomplete (Test Mode DTC)

DESCRIPTION

This circuit is used to send TRC and VSC operation 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. Detection Item DTC Detection Condition Trouble Area
C1203 ECM Communication Circuit Malfunction

Either of the following is detected:


  1. Engine and drive source that are sent from the ECM do not match the ones of the skid control ECU (brake actuator assembly).

  2. No stored information for engine and drive source.

  • The wrong ECU was installed

  • Skid control ECU (brake actuator assembly)
C1270 Initialization Incomplete (Test Mode DTC) Detected only during Test Mode.

  • ECM

  • CAN communication system (skid control ECU to ECM)

  • 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.

      OK
      Proper ECM is installed.

    2. Check if the ECM was replaced before the DTC was stored.

      OK
      ECM was not replaced.
      Result
      Result Proceed to
      OK A
      NG (A proper ECM is not installed and/or the ECM was replaced.) B

    B

    REPLACE ECM for 1AR-FE: Click here
    REPLACE ECM for 2GR-FE: Click here

    A

  2. CHECK PART NUMBER (BRAKE ACTUATOR ASSEMBLY)


    1. Check that a proper skid control ECU (brake actuator assembly) is installed.

      OK
      Proper skid control ECU (brake actuator assembly) is installed.

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

      OK
      Skid control ECU (brake actuator assembly) had not been replaced.
      Result
      Result Proceed to
      OK A
      NG (The skid control ECU (brake actuator assembly) had been replaced.) B
      NG (A proper skid control ECU (brake actuator assembly) is not installed.) C

    B

    PERFORM ZERO POINT CALIBRATION AND STORE SYSTEM INFORMATION OF YAW RATE AND ACCELERATION SENSOR Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

  3. CLEAR AND STORE SYSTEM INFORMATION


    1. Clear the system information.

      Click here

    2. Store the system information.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition switch off.

    3. Turn the ignition switch to ON.

    4. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      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