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DTC C145A: Wiring harness and coupling coil short circuit failure: Diagnosis

WARNING: This page is about a different variant/trim than selected.
  1. STEP 1. Scan tool MB991958 CAN bus diagnostics 

    Use scan tool MB991958 to diagnose the CAN bus lines.

    Q: Is the check result normal? 

    YES  : Go to Step  3.

    NO  : Repair the CAN bus line (Refer to CAN BUS DIAGNOSTICS TABLE ). On completion, go to Step  2.

  2. STEP 2. Check whether the DTC is reset after repairing the CAN bus line. 
    1. Erase the DTC.
    2. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position and hold there for 2 seconds.
    3. Fully depress the accelerator pedal, and maintain its position for 2 seconds.
      NOTE: The coupling coil electronic control is also based on the accelerator pedal opening degree, thus the signal is sent to the ECU.
    4. Check if the DTC is set.

    Q: Is the DTC C145A set? 

    YES  : Go to Step  3.

    NO  : The procedure is complete.

  3. STEP 3. Scan tool MB991958 data list 

    Check the following data list (Refer to DATA LIST REFERENCE TABLE ).

    • Item 04: Coupling current command value
    • Item 05: Coupling current monitor value

    Q: Is the check result normal? 

    YES  : Go to Step  10.

    NO  : Go to Step  4.

  4. STEP 4. Check the following connector: 

    Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case.

    • C-228 AWD-ECU connector
    • D-21 intermediate connector
    • D-23 electronic control coupling solenoid connector
    • C-27 intermediate connector

    Q: Are the connectors and terminals in good condition? 

    YES  : Go to Step  5.

    NO  : Repair the connector(s) or terminal(s). Then go to Step  11.

  5. STEP 5. Wiring harness check 

    Check the wiring harness between the C-228 AWD-ECU connector and the D-21 intermediate connector, and the wiring harness between the D-21 intermediate connector and the D-23 electronic control coupling solenoid side connector for damage or other problem.

    Q: Is the wiring harness in good condition? 

    YES  : Go to Step  6.

    NO  : Repair damage or other problem in the wiring harness. Then go to Step  11.

  6. STEP 6. Resistance measurement between electronic control coupling solenoid connector (coupling side) terminals 

    Disconnect the D-23 connector, and measure the resistance value between the connector terminals on the electronic control coupling side.

    Standard value: 2.2 - 4.0 Ω 

    Q: Is the measured resistance value within the standard value range? 

    YES  : Go to Step  7.

    NO  : Replace the electronic control coupling (Refer to DRIVE MODE SELECTOR ). Then go to Step  11.

  7. STEP 7. Voltage measurement at the AWD-ECU connector 
    1. Disconnect the C-228 AWD-ECU connector.
    2. Measure the voltage between the C-228 wiring harness side connector terminals No. 3, No. 4 (Ignition switch "ON") and the body ground.

      OK: System voltage 

    Q: Is the check result normal? 

    YES  : Go to Step  8.

    NO  : Go to Step  9.

  8. STEP 8. Wiring harness check 

    Check the wiring harness between the C-228 AWD-ECU connector (terminal No. 10) and the body ground for damage or other problem.

    Q: Is the wiring harness in good condition? 

    YES  : Go to Step  10.

    NO  : Repair the wiring harness. Then go to Step  11.

  9. STEP 9. Wiring harness check 
    NOTE: Prior to the wiring harness inspection, check the C-408 and C-415 ETACS-ECU connector, and repair if necessary.

    Check the wiring harness between the C-228 AWD-ECU connector (terminal No. 3) and the fusible link No. 34, and the wiring harness between the C-228 AWD-ECU connector [terminal No. 4 (ignition switch "ON")] and the fusible link No. 34 for damage or other problem.

    Q: Is the wiring harness in good condition? 

    YES  : Go to Step  10.

    NO  : Repair the wiring harness. Then go to Step  11.

  10. STEP 10. Check whether the DTC is reset. 
    1. Erase the DTC.
    2. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position and hold there for 2 seconds.
    3. Fully depress the accelerator pedal, and maintain its position for 2 seconds.
      NOTE: The coupling coil electronic control is also based on the accelerator pedal opening degree, thus the signal is sent to the ECU.
    4. Check if the DTC is set.

    Q: Is the DTC C145A set? 

    YES  : Replace AWD-ECU (Refer to RESISTANCE MEASUREMENT BETWEEN ELECTRONIC CONTROL COUPLING SOLENOID CONNECTOR TERMINALS ). Then go to Step  11.

    NO  : The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).

  11. STEP 11. Check whether the DTC is reset. 
    1. Erase the DTC.
    2. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position and hold there for 2 seconds.
    3. Fully depress the accelerator pedal, and maintain its position for 2 seconds.
      NOTE: The coupling coil electronic control is also based on the accelerator pedal opening degree, thus the signal is sent to the ECU.
    4. Check if the DTC is set.

    Q: Is the DTC C145A set? 

    YES  : Diagnose again from Step  1.

    NO  : The procedure is complete.

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