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Home >> Mitsubishi >> 2010 >> Lancer ES, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Continuously Variable Transaxle On-Vehicle Service -- Lancer) >> Diagnosis >> Symptom Procedures >> Inspection Procedure 1: TCM cannot communication with M.U.T.-III >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.
  1. STEP 1. Check the following connector: 
    • A-18X CVT control relay connector
    • C-41 TCM connector

      Check each terminal for imperfect contact.

      Q: Is the check result normal? 

      1. YES:  Go to Step 2.
      2. NO:  Repair the defective connector.
  2. STEP 2. Check for open circuit in the wiring harness between the relay box connector and the TCM connector. 
    • Between A-18X CVT control relay connector (terminal No. 3) and C-41 TCM connector (terminal No. 12)
    • Between A-18X CVT control relay connector (terminal No. 3) and C-41 TCM connector (terminal No. 25)

      Q: Is the check result normal? 

      1. YES:  Go to Step 3.
      2. NO:  Repair the wiring harness.
  3. STEP 3. Check for open circuit in the wiring harness between the TCM connector and the ground. 
    • Between C-41 TCM (terminal No. 13) and ground
    • Between C-41 TCM (terminal No. 26) and ground

      Q: Is the check result normal? 

      1. YES:  Go to Step 4.
      2. NO:  Repair the wiring harness.
  4. STEP 4. Retest the system. 

    Recheck the trouble symptom.

    Q: Does the malfunction take place again? 

    1. YES:  Replace TCM.
    2. NO:  Intermittent malfunction
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