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Home >> Mitsubishi >> 2017 >> Lancer SE >> Repair and Diagnosis >> External Pages >> Different car >> Section 89 (Twin Clutch-SPORTRONIC Shift Transmission (TC-SST) - With Diagnostics - Lancer (5 Of 6)) >> Diagnosis < Active Center Differential (ACD) > >> Diagnostic Trouble Code Procedures >> DTC U0401: Engine Data Error >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2015 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.
  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 2.
    2. NO:  Repair the CAN bus lines. (Refer to TROUBLESHOOTING ).
  2. STEP 2. Scan tool diagnostic trouble code 

    Check the engine diagnostic trouble code. (Refer to DIAGNOSTIC TROUBLE CODE TABLE ).

    Q: Is the DTC set? 

    1. YES:  Perform the relevant troubleshooting.
    2. NO:  Go to Step 3.
  3. STEP 3. Scan tool data list 

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

    • Item No. 15: Engine speed
    • Item No. 16: Engine torque (Driver request value)

    Q: Is the check result normal? 

    1. YES:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    2. NO:  Go to Step 4.
  4. STEP 4. Check whether the DTC is reset. 

    Q: Is DTC No. U0401 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. U0401 set? 

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