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Home >> Mitsubishi >> 2014 >> Lancer ES Sportback >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Continuously Variable Transaxle (CVT) Diagnosis & On-Vehicle Service - With Diagnostics - Lancer >> Diagnosis >> Diagnostic Trouble Code Procedures >> DTC P1637: Malfunction of Memory Backup >> Diagnostic Procedure

Diagnostic Procedure

  1. STEP 1. Check if diagnostic trouble code No. P1637 is erased by turning the ignition switch from the "LOCK" (OFF) position to the "ON" position. 

    Q: Is the check result normal? 

    1. YES:  This diagnostic trouble code will be stored by disconnecting the battery. If the diagnostic trouble code is not erased by turning the ignition switch to the "ON" position, it is judged to be normal.
    2. NO:  Go to Step 2.
  2. STEP 2. Check for open circuit in power supply wiring harness 
    • Between relay box and C-40 TCM backup power supply connector (terminal No. 31)
    • Between relay box and A-15X CVT control relay (terminal No. 4)

    Q: Is the check result normal? 

    1. YES:  Go to Step 3.
    2. NO:  Repair the wiring harness.
  3. STEP 3. Symptom recheck after erasing diagnostic trouble code 

    Q: Is the check result normal? 

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