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Home >> Infiniti >> 2015 >> Q50 Base, RWD >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Brake Control System (VDC - Diagnostic Trouble Codes (DTCS) Symptom Tests And Component R&R) (Exc Hybrid) >> DTC/Circuit Diagnosis >> DTC C1138: Steering System >> Diagnosis Procedure >> Diagnostic Test

Diagnostic Test

  1. CHECK DIRECT ADAPTIVE STEERING SYSTEM

    With CONSULT

    1. Perform self-diagnosis for "EPS/DAST 3". Refer to CONSULT FUNCTION .
    2. Perform self-diagnosis for "DAST 1". Refer to CONSULT FUNCTION .
    3. Perform self-diagnosis for "DAST 2". Refer to CONSULT FUNCTION .

    Is any DTC detected?

    YES 

    Check the DTC.

    NO 

    GO TO STEP 2  .

  2. CHECK CONNECTOR AND TERMINAL

    1. Turn the ignition switch OFF.
    2. Disconnect steering force control module harness connector.
    3. Disconnect steering angle main control module harness connector.
    4. Disconnect steering angle sub control module harness connector.
    5. Disconnect ABS actuator and electric unit (control unit) harness connector.
    6. Check the connector for disconnection or looseness.
    7. Check the pin terminals for damage or loose connection with harness connector.

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Repair / replace harness, connector, or terminal, securely lock the connector, and GO TO STEP 3  .

  3. PERFORM SELF-DIAGNOSIS

    With CONSULT

    1. Connect steering force control module harness connector.
    2. Connect steering angle main control module harness connector.
    3. Connect steering angle sub control module harness connector.
    4. Connect ABS actuator and electric unit (control unit) harness connector.
    5. Erase self-diagnosis result for "ABS".
    6. Turn the ignition switch OFF → ON.
      CAUTION:
      • Be sure to wait of 10 seconds after turning ignition switch OFF or ON.
      • Start the engine.
    7. Repeat step 6 two or more times.
    8. Perform self-diagnosis for "ABS".

    Is any DTC "C1138" or "U1000" detected?

    YES ("C1138") 

    GO TO STEP 1  .

    YES ("U1000") 

    Refer to TROUBLE DIAGNOSIS FLOW CHART .

    NO 

    INSPECTION END