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Home >> Mitsubishi >> 2014 >> Lancer ES Sportback >> Repair and Diagnosis >> External Pages >> Different car >> Section 51 (Continuously Variable Transaxle (CVT) On-Vehicle Service - With Diagnostics) >> Diagnosis < CVT > >> Diagnostic Trouble Code Procedures >> DTC P1777: Malfunction of Stepper Motor >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. STEP 1. Check for open circuit and short to ground in SPM1, SPM2, SPM3, SPM4 line between the TCM connector and the CVT assembly (stepper motor) 

    Between TCM connector and body ground

    OK: Resistance value is approximately 15 Ω. 

    Q: Is the check result normal? 

    1. YES:  Go to  Step 3.
    2. NO:  Go to Step 2.
  2. STEP 2. Check for open circuit and short to ground in SPM1, SPM2, SPM3, SPM4 line between TCM connector and the CVT assembly (stepper motor) 

    Check that there is no continuity in both sides of the connectors and that no short circuit is present between the connectors and the body ground.

    Q: Is the check result normal? 

    1. YES:  Replace the control valve.
    2. NO:  Repair the connector(s) or wiring harness.
  3. STEP 3. Symptom recheck after erasing DTC 

    Q: Is the check result normal? 

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