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ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1203/95

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DTC Code DTC Name
C1203/95 ECM Communication Circuit Malfunction
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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 assembly, and hybrid control system information from the hybrid vehicle control ECU assembly 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. INF Code DTC Detection Condition Trouble Area
C1203/95 -

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)
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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.

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PROCEDURE


  1. Click here

    CHECK PART NUMBER


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

      OK
      Proper ECUs and sensor are installed.

    2. Check if the hybrid vehicle control ECU assembly, main body ECU (multiplex network body ECU) and yaw rate and acceleration sensor (airbag sensor 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 assembly is not installed and/or the hybrid vehicle control ECU assembly 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 sensor assembly) is not installed and/or the yaw rate and acceleration sensor (airbag sensor assembly) was replaced.) D

  2. Click here

    PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE


    1. Perform initialization and calibration of the linear solenoid valve (Click here).

      Tip:

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


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    RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs (Click here).

    3. Turn the power switch on (IG).

    4. Check if the same DTC is output (Click here).

      Result
      Result Proceed to
      DTC C1203/95 is output (for LHD). A
      DTC C1203/95 is output (for RHD). B
      DTC C1203/95 is not output. C

    • A

      REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

    • B

      REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

    • C

      END