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

CAUTION / NOTICE / HINT

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

      Error: Momentary interruption

      Normal: Normal

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

      Error: Invalid

      Normal: Normal

      		 -
      OK
      Normal (There are no momentary interruptions.)

      Tech Tips

      Perform the above inspection before removing the sensor and connector.

      Result
      Result Proceed to
      OK A
      NG (w/ Central Gateway ECU) B
      NG (w/o Central Gateway ECU) C

    B

    INSPECT CAN COMMUNICATION SYSTEM Click here

    C

    INSPECT CAN COMMUNICATION SYSTEM Click here

    A

  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 (See page for with Central Gateway ECU, Click here for without Central Gateway ECU).

    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 (w/ Central Gateway ECU). C
      CAN communication system DTCs are output (w/o Central Gateway ECU). D

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    INSPECT CAN COMMUNICATION SYSTEM Click here

    D

    INSPECT CAN COMMUNICATION SYSTEM Click here