VEHICLE STABILITY CONTROL SYSTEM(for Vacuum Brake Booster), Diagnostic DTC:C1437

DTC Code DTC Name
C1437 Lost Communication with ECM

DESCRIPTION

The skid control ECU receives signals from the ECM via the CAN communication system.

DTC Code DTC Detection Condition Trouble Area
C1437 When the IG1 terminal voltage is 10 V or higher and the vehicle speed is 15 km/h (9 mph) or more, data cannot be sent to the ECM for 2 seconds or more.

  • CAN communication system (Skid control ECU to ECM)

  • Brake actuator assembly (Skid control ECU)

CAUTION / NOTICE / HINT

Note

When replacing the brake actuator assembly, perform calibration Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)


    1. Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to the DTC Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      EFI Communication Open ECM communication open circuit detection/ Error or Normal Normal -
      OK
      Normal (there are no momentary interruptions).

      Tech Tips

      Perform the above inspection before removing the sensor and disconnecting the connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - ECM) Click here

    OK

  2. RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Clear the DTC Click here.

    3. Start the engine.

    4. Drive the vehicle at a speed of 15 km/h (9 mph) or more for 10 seconds or more.

    5. Check that no CAN communication system DTC is output Click here.

    6. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC C1437 is not output A
      DTC C1437 is output B
      CAN communication system DTC is output for LHD without Entry and Start System C
      CAN communication system DTC is output for LHD with Entry and Start System D

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    D

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

  3. REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - ECM)


    1. Turn the ignition switch off.

    2. Repair or replace the harness or connector.

    3. Check for any momentary interruption between the skid control ECU and ECM Click here.

    4. Check that there is no momentary interruption.


    NEXT

  4. RECONFIRM DTC


    1. Turn the ignition switch off.

    2. Clear the DTCs Click here.

    3. Start the engine.

    4. Drive the vehicle at a speed of 15 km/h (9 mph) or more for 10 seconds or more.

    5. Check that no CAN communication system DTC is output Click here.

    6. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC C1437 is not output A
      DTC C1437 is output B
      CAN communication system DTC is output for LHD without Entry and Start System C
      CAN communication system DTC is output for LHD with Entry and Start System D

    A

    END

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    D

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here