VEHICLE STABILITY CONTROL SYSTEM, 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 No.

Detection Item

DTC Detection Condition

Trouble Area

C1437

Lost Communication with ECM

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 from the ECM for 2 seconds or more.

  • Engine control system

  • CAN communication system

  • Master cylinder solenoid (Skid control ECU)

CAUTION / NOTICE / HINT

Note:

When replacing the master cylinder solenoid, 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

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      EFI Communication Open

      EFI communication open detection

      Error or Normal

      Normal

      -

      OK

      Normal (there are no momentary interruptions).

      Tip:

      Perform the above inspection before removing the sensor and connector.

      Result

      Result

      OK

      NG
    NG

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

    OK

  2. RECONFIRM DTC

    1. Turn the engine switch off.

    2. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    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

      Chassis > ABS/VSC/TRC > Trouble Codes

    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

      C

      Chassis > ABS/VSC/TRC > Trouble Codes

    A

    USE SIMULATION METHOD TO CHECK

    Click here

    B

    GO TO ENGINE CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

    Click here

    C

    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 engine 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.

      Result

      Result

      NEXT
    NEXT

  4. RECONFIRM DTC

    1. Turn the engine switch off.

    2. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    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

      Chassis > ABS/VSC/TRC > Trouble Codes

    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

      C

      Chassis > ABS/VSC/TRC > Trouble Codes

    A

    END

    B

    REPLACE MASTER CYLINDER SOLENOID

    Click here

    C

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

    Click here