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Home >> Mitsubishi >> 2014 >> Lancer ES Sportback >> Repair and Diagnosis >> External Pages >> Different car >> Section 62 (Heating, Air Conditioning & Ventilation - With Diagnostics) >> Automatic A/C Diagnosis >> Symptom Procedures >> INSPECTION PROCEDURE 5: The Inside/Outside Air Changeover is impossible >> 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 the operation of the heater control panel assembly (A/C-ECU) 

    Check that the A/C switch, rear window defogger switch and air volume control dial can operate.

    Q: Is the check result normal? 

    1. YES:  Go to Step 2.
    2. NO:  INSPECTION PROCEDURE 11: Refer to HEATER CONTROL PANEL ASSEMBLY (A/C-ECU) POWER SUPPLY SYSTEM  .
  2. STEP 2. Using scan tool (M.U.T.-III), DTC check. 

    Check that the diagnostic trouble code related to the air conditioning is not stored.

    Q: Is the diagnostic trouble code stored? 

    1. YES:  Carry out the diagnostic trouble code procedures. Refer to DIAGNOSTIC TROUBLE CODE CHART  .
    2. NO:  Go to Step 3.
  3. STEP 3. Using scan tool (M.U.T.-III), check actuator test of heater controller assembly (A/C-ECU) check. 

    Carry out the actuator test. (Refer to ACTUATOR TEST TABLE  ).

    Item No.5: In/out select damper 

    Q: Does the blower motor work normally? 

    1. YES:  This diagnosis is complete.
    2. NO:  Go to Step 4.
  4. STEP 4. Check of open circuit in F/RA, F/RA' F/RB and F/RB' line between outside/inside air selection damper control motor and heater controller assembly (A/C-ECU) connector. 

    Q: Is the check result normal? 

    1. YES:  Go to Step 5.
    2. NO:  Repair the connector(s) or wiring harness.
  5. STEP 5. Replace the air outside/inside air circulation switching damper motor, and then recheck the trouble symptom. 

    Check to see that the outside air/inside air circulation switching damper motor operates normally.

    Q: Is the check result normal? 

    1. YES:  This diagnosis is complete.
    2. NO:  Replace the heater controller assembly (A/C-ECU).
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