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. Detection Item DTC Detection Condition Trouble Area Note
C1437 Lost Communication with ECM 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


      Chassis > ABS/VSC/TRC > Data List
      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

      		 -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      EFI Communication Open
      EFI Communication Invalid
      OK
      Normal (There are no momentary interruptions.)

      Tech Tips

      Perform the above inspection before removing the sensor and connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK CAN COMMUNICATION SYSTEM for LHD: Click here
    CHECK CAN COMMUNICATION SYSTEM for RHD: Click here

    OK

  2. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the engine 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.

      for LHD: Click here

      for RHD: Click here

    6. Check if the same DTC is recorded.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1437 is not output. A
      DTC C1437 is output. B
      CAN communication system DTC is output. C

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    CHECK CAN COMMUNICATION SYSTEM for LHD: Click here
    CHECK CAN COMMUNICATION SYSTEM for RHD: Click here