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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 C161D: Electric Pump Relay System (Faulty Circuit) >> 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 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. C161D set? 

    1. YES:  Go to Step 3.
    2. NO:  This diagnosis is complete.
  3. STEP 3. Scan tool actuator test 

    OK: Operating sound of the electric pump can be heard. 

    Q: Is the check result normal? 

    1. YES:  Go to  Step 9.
    2. NO:  Go to Step 4.
  4. STEP 4. Electric pump relay check. 

    Check the electric pump relay. (Refer to ELECTRIC PUMP RELAY ).

    Q: Is the check result normal? 

    1. YES:  Go to Step 5.
    2. NO:  Replace the electric pump relay. (Refer to ELECTRIC PUMP RELAY ). Then go to  Step 9.
  5. STEP 5. Electric pump relay connector, AWC-ECU connector check: A-22X, C-51 

    Q: Is the check result normal? 

    1. YES:  Go to Step 6.
    2. NO:  Repair the defective connector. Then go to  Step 9.
  6. STEP 6. Check the wiring harness between A-22X electric pump relay connector terminal No. 3 and C-51 AWC-ECU connector terminal No. 20. 

    Check the power supply line for short or open circuit.

    Q: Is the check result normal? 

    1. YES:  Go to Step 7.
    2. NO:  Check C-39 intermediate connector. When no problem is found, repair the wiring harness. Then go to  Step 9.
  7. STEP 7. Check the wiring harness between A-22X electric pump relay connector terminal No. 1 and body ground. 

    Check the ground line for open circuit.

    Q: Is the check result normal? 

    1. YES:  Go to Step 8.
    2. NO:  Repair the wiring harness. Then go to  Step 9.
  8. STEP 8. Check whether the DTC is reset. 

    Q: Is DTC No. C161D set? 

    1. YES:  Replace the AWC-ECU. (Refer to AWC-ECU ). Then go to Step 9.
    2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
  9. STEP 9. Check whether the DTC is reset. 

    Q: Is DTC No. C161D set? 

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