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Home >> Mitsubishi >> 2014 >> Lancer ES Sportback >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Manual Transaxle On-Vehicle Service - Lancer Evolution) >> Diagnosis < S-AWC(Super All Wheel Control) > >> Symptom Procedures >> INSPECTION PROCEDURE 3: AWC-ECU power supply circuit malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2008 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? 

    YES  : Go to Step  3.

    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? 

    YES  : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)

    NO  : Go to Step 3.

  3. STEP 3. Voltage measurement at C-46 AWC-ECU connector 

    Measure the voltage between C-46 AWC-ECU connector terminal No.12 - and the body ground.

    OK: Battery positive voltage 

    Q: Is the check result normal? 

    YES  : Go to Step  6.

    NO  : Go to Step 4.

  4. STEP 4. AWC-ECU connector, ETACS-ECU connector check: C-46, C-315 

    Q: Is the check result normal? 

    YES  : Go to Step 5.

    NO  : Repair the defective connector. Then go to Step  13.

  5. STEP 5. Check the wiring harness between C-46 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? 

    YES  : Go to Step  12.

    NO  : Check C-41 intermediate connector, C-43 J/C (4), C-103 J/C (3). When no problem is found, repair the wiring harness. Then go to Step  12.

  6. STEP 6. Voltage measurement at C-46 AWC-ECU connector 
    1. With C-46 AWC-ECU connector connected, measure the voltage between the terminal No. 16 and the body ground.
    2. Turn the ignition switch to the "ON" position.

      OK: Battery positive voltage 

    Q: Is the check result normal? 

    YES  : Go to Step  9.

    NO  : Go to Step 7.

  7. STEP 7. AWC-ECU connector, ETACS-ECU connector check: C-46, C-313 

    Q: Is the check result normal? 

    YES  : Go to Step 8.

    NO  : Repair the defective connector. Then go to Step  13.

  8. STEP 8. Check the wiring harness between C-46 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? 

    YES  : Go to Step  12.

    NO  : Check D-27 J/C (5). When no problem is found, repair the wiring harness. Then go to Step  12.

  9. STEP 9. AWC-ECU connector check: C-46 

    Q: Is the check result normal? 

    YES  : Go to Step 10.

    NO  : Repair the defective connector. Then go to Step  13.

  10. STEP 10. Check the wiring harness between C-46 AWC-ECU connector terminal No. 13 and body ground. 

    Check the wiring harness for open circuit.

    Q: Is the check result normal? 

    YES  : Go to Step 11.

    NO  : Repair the wiring harness. Then go to Step  13.

  11. STEP 11. Scan tool service data 

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

    Q: Is the check result normal? 

    YES  : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)

    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? 

    YES  : Replace the ETACS-ECU. (Refer to ETACS-ECU .) Then go to Step 13.

    NO  : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)

  13. STEP 13. Retest the system. 

    Q: Is the check result normal? 

    YES  : Return to Step  1.

    NO  : This diagnosis is complete.

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