ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1203/95

DTC Code DTC Name
C1203/95 ECM Communication Circuit Malfunction

DESCRIPTION

This circuit is used to send TRC and VSC information from the skid control ECU (brake booster with master cylinder assembly) to the hybrid vehicle control ECU, and hybrid control system information from the hybrid vehicle control ECU to the skid control ECU (brake booster with master cylinder assembly) via CAN communication.

Identification information sent from other ECUs is stored when the vehicle is shipped from the factory and used as the default values.

Note

DTC C1203/95 is output when an incorrect ECU is installed. If initialization is performed and learning occurs with an incorrect ECU installed, operations and functions will differ from those stored when the vehicle was shipped from the factory. Therefore, make sure that learning occurs properly.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1203/95 ECM Communication Circuit Malfunction -

Either of the following is detected:


  1. Identification information sent from other ECUs does not match with the value stored when shipped from the factory.

  2. No stored information for destination.

  • The wrong ECU or sensor was installed

  • Skid control ECU (Brake booster with master cylinder assembly)

 Electronically controlled brake system DTC

CAUTION / NOTICE / HINT

Note


  • When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.

    Click here

  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

PROCEDURE


  1. CHECK PART NUMBER


    1. Check that the proper hybrid vehicle control ECU, main body ECU (multiplex network body ECU) and yaw rate and acceleration sensor (airbag ECU assembly) are installed.

      OK
      Proper ECUs and sensor are installed.

    2. Check if the hybrid vehicle control ECU, main body ECU (multiplex network body ECU) and yaw rate and acceleration sensor (airbag ECU assembly) were replaced before the DTC was recorded.

      OK
      ECU or sensor was not replaced.
      Result
      Result Proceed to
      OK A
      NG (A proper hybrid vehicle control ECU is not installed and/or the hybrid vehicle control ECU was replaced.) B
      NG (A proper main body ECU (multiplex network body ECU) is not installed and/or the main body ECU (multiplex network body ECU) was replaced.) C
      NG (A proper yaw rate and acceleration sensor (airbag ECU assembly) is not installed and/or the yaw rate and acceleration sensor (airbag ECU assembly) was replaced.) D

    B

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    C

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here

    D

    REPLACE AIRBAG ECU ASSEMBLY Click here

    A

  2. PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE


    1. Perform initialization and calibration of the linear solenoid valve.

      Click here


      Chassis > ABS/VSC/TRC > Utility
      Tester Display
      ECB Utility

      Tech Tips

      Before performing initialization and calibration of the linear solenoid valve, DTC C1203/95 will be output.

      Result
      Proceed to
      NEXT

    NEXT

  3. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the power switch off.

    4. Turn the power switch on (IG).

    5. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1203/95 is output. A
      DTC C1203/95 is not output. B

    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here
    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here

    B

    END