VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1437

DTC Code DTC Name
C1437 Lost Communication with ECM

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the ECM via the CAN communication system.

DTC No. DTC Detection Condition Trouble Area
C1437 When voltage at terminal +BS is 10 to 17.4 V and vehicle speed is 15 km/h (9 mph) or more, data cannot be sent to ECM continuously for 2 seconds or more.

  • CAN communication system (Skid control ECU to ECM)

  • Skid control ECU (Brake actuator assembly)

  • ECM

INSPECTION PROCEDURE

Note

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)


    1. Using the GTS, 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 detection / Error or Normal Normal Error: Momentary interruption
      EFI Communication Invalid ECM communication invalid detection / Error or Normal Normal Error: Invalid
      OK
      Normal (There are no momentary interruptions.)

      Tech Tips

      Perform the above inspection before removing the sensor and connector.


    NG

    CHECK CAN COMMUNICATION SYSTEM Click here

    OK

  2. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the ignition switch off.

    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 recorded Click here.

      Result
      Result Proceed to
      DTC C1437 is not output A
      DTC C1437 is output B
      CAN communication system DTC is output C

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    CHECK CAN COMMUNICATION SYSTEM Click here

    A

    USE SIMULATION METHOD TO CHECK Click here