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Home >> Mitsubishi >> 2014 >> Lancer SE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 32 (Twin Clutch SPORTRONIC Shift Transmission (TC-SST) - With Diagnostics - Lancer (5 Of 6)) >> Diagnosis < Active Center Differential (ACD) > >> Diagnostic Trouble Code Procedures >> DTC C121A: Steering Wheel Sensor System (Neutral Learning Abnormality) >> Diagnosis

DTC C121A: Steering Wheel Sensor System (Neutral Learning Abnormality): Diagnosis

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  1. STEP 1. Scan tool CAN bus diagnostics 

    Using scan tool MB991958, diagnose the CAN bus lines.

    Q: Is the check result normal? 

    1. YES:  Go to  Step 3.
    2. NO:  Repair the CAN bus lines. (Refer to TROUBLESHOOTING ). After repairing the CAN bus line, go to Step 2.
  2. STEP 2. Check whether the DTC is reset. 

    Q: Is DTC No. C121A set? 

    1. YES:  Go to Step 3.
    2. NO:  This diagnosis is complete.
  3. STEP 3. Steering wheel sensor calibration. 

    Perform calibration of the steering wheel sensor. (Refer to STEERING WHEEL SENSOR CALIBRATION ).

    Q: Has the calibration succeeded? 

    1. YES:  Go to Step 4.
    2. NO:  Replace the steering wheel sensor. (Refer to STEERING WHEEL SENSOR ). Then, go to Step 4.
  4. STEP 4. Check whether the DTC is reset. 

    Q: Is DTC No. C121A set? 

    1. YES:  Replace the AWC-ECU. (Refer to AWC-ECU ). Then, go to Step 5.
    2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
  5. STEP 5. Check whether the DTC is reset. 

    Q: Is DTC No. C121A set? 

    1. YES:  Return to  Step 1.
    2. NO:  This diagnosis is complete.
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