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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 >> Diagnostic Trouble Code Procedures >> DTC P0720: Malfunction of Secondary Pulley Speed Sensor >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.
  1. STEP 1. M.U.T.-III data list 

    Item 2: Secondary speed sensor signal (Refer to DATA LIST REFERENCE TABLE  .)

    Q: Is the check result normal? 

    1. YES:  Intermittent malfunction
    2. NO:  Go to Step 2.
  2. STEP 2. Check the following connector: 
    • C-40 TCM connector
    • B-113 Secondary pulley speed sensor connector
    • A-10 Intermediate connector

      Check the terminals for a contact status problem and internal short circuit.

      Q: Is the check result normal? 

      1. YES:  Go to Step 3.
      2. NO:  Repair the defective connector.
  3. STEP 3. Check for open circuit in the wiring harness between the secondary pulley speed sensor connector and the TCM connector. 

    Between B-113 secondary pulley speed sensor connector (terminal No. 3) and C-40 TCM connector (terminal No. 48)

    Q: Is the check result normal? 

    1. YES:  Go to Step 4.
    2. NO:  Repair the wiring harness.
  4. STEP 4. Check for open circuit and short to ground in the wiring harness between the secondary pulley speed sensor connector and the TCM connector 

    Between B-113 secondary pulley speed sensor connector (terminal No. 2) and C-40 TCM connector (terminal No. 36)

    Q: Is the check result normal? 

    1. YES:  Go to Step 5.
    2. NO:  Repair the wiring harness.
  5. STEP 5. Check for open circuit in the wiring harness between the CVT control relay and the secondary pulley speed sensor connector. 

    Between A-15X CVT control relay (terminal No. 3) and B-113 secondary pulley speed sensor connector (terminal No. 1)

    Q: Is the check result normal? 

    1. YES:  Go to Step 6.
    2. NO:  Repair the wiring harness.
  6. STEP 6. Secondary pulley speed sensor check 

    Visually check the tip of the sensor for foreign materials or damage.

    Q: Is the check result normal? 

    1. YES:  Go to Step 7.
    2. NO:  Repair.
  7. STEP 7. Diagnosis code recheck after replacing the secondary pulley speed sensor 

    Q: Is the check result normal? 

    1. YES:  The procedure is complete.
    2. NO:  Replace TCM.