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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) > >> Symptom Procedures >> INSPECTION PROCEDURE 3: AWC-ECU power supply circuit malfunction (Control mode is not displayed.) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.
  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. Retest the system. 

    Q: Is the check result normal? 

    1. YES:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    2. NO:  Go to Step 3.
  3. STEP 3. Voltage measurement at C-51 AWC-ECU connector 

    Disconnect the connector, and measure the voltage between terminal No. 12 and ground at the wiring harness side.

    OK: Battery positive voltage 

    Q: Is the check result normal? 

    1. YES:  Go to  Step 6.
    2. NO:  Go to Step 4.
  4. STEP 4. AWC-ECU connector, ETACS-ECU connector check: C-51, C-315 

    Q: Is the check result normal? 

    1. YES:  Go to Step 5.
    2. NO:  Repair the defective connector. Then go to  Step 13.
  5. STEP 5. Check the wiring harness between C-51 AWC-ECU connector terminal No. 12 and C-315 ETACS-ECU connector terminal No. 4. 

    Check the wiring harness for open circuit.

    Q: Is the check result normal? 

    1. YES:  Go to  Step 12.
    2. NO:  Check C-35 intermediate connector. When no problem is found, repair the wiring harness. Then go to  Step 13.
  6. STEP 6. Voltage measurement at C-51 AWC-ECU connector 
    1. Disconnect the connector, and measure the voltage between terminal No. 16 and ground at the wiring harness side.
    2. Turn the ignition switch to the "ON" position.

      OK: Battery positive voltage 

    Q: Is the check result normal? 

    1. YES:  Go to  Step 9.
    2. NO:  Go to Step 7.
  7. STEP 7. AWC-ECU connector, ETACS-ECU connector check: C-51, C-313 

    Q: Is the check result normal? 

    1. YES:  Go to Step 8.
    2. NO:  Repair the defective connector. Then go to  Step 13.
  8. STEP 8. Check the wiring harness between C-51 AWC-ECU connector terminal No. 16 and C-313 ETACS-ECU connector terminal No. 2. 

    Check the wiring harness for open circuit.

    Q: Is the check result normal? 

    1. YES:  Go to  Step 12.
    2. NO:  When no problem is found, repair the wiring harness. Then go to  Step 11.
  9. STEP 9. AWC-ECU connector check: C-51 

    Q: Is the check result normal? 

    1. YES:  Go to Step 10.
    2. NO:  Repair the defective connector. Then go to  Step 13.
  10. STEP 10. Check the wiring harness between C-51 AWC-ECU connector terminal No. 13 and body ground. 

    Check the wiring harness for open circuit.

    Q: Is the check result normal? 

    1. YES:  Go to Step 11.
    2. NO:  Repair the wiring harness. Then go to  Step 13.
  11. STEP 11. Scan tool data list 

    Item No. 43: Battery voltage (Refer to DATA LIST REFERENCE TABLE  ).

    Q: Is the check result normal? 

    1. YES:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    2. NO:  Replace the AWC-ECU. (Refer to AWC-ECU ). Then go to  Step 13.
  12. STEP 12. Retest the system. 

    Q: Is the check result normal? 

    1. YES:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
    2. NO:  Replace the ETACS-ECU. (Refer to ETACS-ECU ). Then go to Step 13.
  13. STEP 13. Retest the system. 

    Q: Is the check result normal? 

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