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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 C161C: ACD Proportioning Valve System (Malfunction) >> 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. C161C set? 

    1. YES:  Go to Step 3.
    2. NO:  This diagnosis is complete.
  3. STEP 3. ACD proportioning valve check. 

    Measure the resistance of ACD proportioning valve.

    Standard value: 3.7 ± 0.3 Ω 

    Q: Is the check result normal? 

    1. YES:  Go to Step 4.
    2. NO:  Replace the hydraulic unit. (Refer to HYDRAULIC UNIT ). Then go to  Step 8.
  4. STEP 4. AWC-ECU connector, intermediate connector, proportioning valve (for ACD) connector check: C-51, D-11, F-28 

    Q: Is the check result normal? 

    1. YES:  Go to Step 5.
    2. NO:  Repair the defective connector. Then go to  Step 8.
  5. STEP 5. Check the wiring harness between C-51 AWC-ECU connector terminal No. 1 and F-28 proportioning valve (for ACD) connector terminal No. 3 and between F-28 proportioning valve (for ACD) connector terminal No. 2 and body ground. 

    Check the power supply line for open or short circuit, and check the ground line for open circuit.

    Q: Is the check result normal? 

    1. YES:  Go to Step 6.
    2. NO:  Repair the wiring harness. Then go to  Step 8.
  6. STEP 6. Scan tool data list 

    Item 92: ACD proportion valve (Refer to DATA LIST REFERENCE TABLE  ).

    Q: Is the check result normal? 

    1. YES:  Go to Step 7.
    2. NO:  Replace the AWC-ECU. (Refer to AWC-ECU ). Then go to  Step 8.
  7. STEP 7. Check whether the DTC is reset. 

    Q: Is DTC No. C161C set? 

    1. YES:  Replace the AWC-ECU. (Refer to AWC-ECU ). Then go to Step 8.
    2. NO:  Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
  8. STEP 8. Check whether the DTC is reset. 

    Q: Is DTC No. C161C set? 

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