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 the IG1 terminal voltage is 10 V or more 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 (Brake actuator assembly)

  • ECM

INSPECTION PROCEDURE

Note

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration 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 a 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

      Error: Momentary interruption

      Normal: Normal

      		 -
      EFI Communication Invalid ECM communication invalid detection / Error or Normal

      Error: Invalid

      Normal: Normal

      		 -
      OK
      There are no momentary interruptions.

      Tech Tips

      Perform the above inspection before removing the sensor and connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BRAKE ACTUATOR ASSEMBLY - ECM) Click here

    OK

  2. RECONFIRM DTC


    1. Turn the engine switch off.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off.

    4. Start the engine.

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

    6. Check that no CAN communication system DTCs are output Click here.

    7. 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 DTCs are output. C

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    INSPECT CAN COMMUNICATION SYSTEM Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  3. REPAIR OR REPLACE HARNESS OR CONNECTOR (BRAKE ACTUATOR ASSEMBLY - ECM)


    1. Turn the engine switch off.

    2. Repair or replace the harness or connector.

    3. Check for any momentary interruption between the skid control ECU (brake actuator assembly) and the ECM Click here.


    NEXT

  4. RECONFIRM DTC


    1. Turn the engine switch off.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off.

    4. Start the engine.

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

    6. Check that no CAN communication system DTCs are output Click here.

    7. 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 DTCs are output. C

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    INSPECT CAN COMMUNICATION SYSTEM Click here

    A

    END