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

C1437

Lost Communication with ECM

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 to ECM)

  • Skid control ECU (brake actuator assembly)

CAUTION / NOTICE / HINT

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 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

    Normal or Error

    Normal

    Error: Momentary interruption

    Chassis > ABS/VSC/TRC > Data List

    Tester Display

    EFI Communication Open
    Tip:

    Perform the above inspection before removing the sensor and connector.

    OK

    There are no momentary interruptions.

    Result

    Proceed to

    OK

    NG
    NG

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

    OK

  2. RECONFIRM DTC

    1. Turn the ignition switch off.

    2. Clear the DTCs.

      Click here

    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 hereClick hereClick here

      for RHD:Click hereClick hereClick here

    6. Check if the same DTC is recorded.

      Click here

    Chassis > ABS/VSC/TRC > Clear DTCs

    Chassis > ABS/VSC/TRC > Trouble Codes

    Result

    Proceed to

    DTC C1437 is not output

    DTC C1437 is output

    CAN communication system DTC is output (for LHD)

    CAN communication system DTC is output (for RHD)
    DTC C1437 is not output

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick hereClick here

    DTC C1437 is output

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here

    CAN communication system DTC is output (for LHD)

    CHECK CAN COMMUNICATION SYSTEM

    Click here

    CAN communication system DTC is output (for RHD)

    CHECK CAN COMMUNICATION SYSTEM

    Click here

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

    1. Turn the ignition 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

    4. Check that there is no momentary interruption.

    Result

    Proceed to

    NEXT
    NEXT

  4. RECONFIRM DTC

    1. Turn the ignition switch off.

    2. Clear the DTCs

      Click here

    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 hereClick hereClick here

      for RHD:Click hereClick hereClick here

    6. Check if the same DTC is recorded.

      Click here

    Chassis > ABS/VSC/TRC > Clear DTCs

    Chassis > ABS/VSC/TRC > Trouble Codes

    Result

    Proceed to

    DTC is not output

    DTC is output

    CAN communication system DTC is output (for LHD)

    CAN communication system DTC is output (for RHD)
    DTC is not output

    END

    DTC is output

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here

    CAN communication system DTC is output (for LHD)

    CHECK CAN COMMUNICATION SYSTEM

    Click here

    CAN communication system DTC is output (for RHD)

    CHECK CAN COMMUNICATION SYSTEM

    Click here