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Home >> Mitsubishi >> 2014 >> Lancer SE >> Repair and Diagnosis >> External Pages >> Different car >> Section 62 (Heating, Air Conditioning & Ventilation - With Diagnostics) >> Automatic A/C Diagnosis >> Diagnostic Trouble Code Procedures >> Code No. B1031: Fin thermo Sensor system (short circuit); code No. B1032: Fin thermo Sensor system (open circuit) >> 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. Using scan tool (M.U.T.-III), check data list. 

    Check that the following service data display contents are normal. (Refer to DATA LIST REFERENCE TABLE  ).

    Item No.20: Air thermo sensor 

    Q: Is the check result normal? 

    1. YES:  Go to  Step 4.
    2. NO:  Go to Step 2.
  2. STEP 2. Check of open and short circuit in + and - line between fin thermo sensor and auto heater controller assembly (A/C-ECU) connector. 

    Q: Is the check result normal? 

    1. YES:  Go to Step 3.
    2. NO:  Repair the connector(s) or wiring harness.
  3. STEP 3. Check the fin thermo sensor. 

    Q: Is the check result normal? 

    1. YES:  Go to Step 4.
    2. NO:  Replace the air mixing damper control motor and potentiometer.
  4. STEP 4. Check whether the diagnostic trouble code is stored again. 

    Q: Is the diagnostic trouble code stored? 

    1. YES:  Replace the heater controller assembly (A/C-ECU).
    2. NO:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
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