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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 7: A/C outlet air temperature cannot be set >> 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 compressor operation 

    Check that the compressor operates under the following conditions.

    • Engine operation
    • Air volume control dial: Maximum
    • Air conditioning switch: ON
    • Temperature control dial: MAX COOL

    Q: Is the check result normal? 

    1. YES:  Go to Step 2.
    2. NO:  Refer to INSPECTION PROCEDURE 6: "The A/C compressor does not work"  .
  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 < Single-zone AUTO A/C >:  Go to Step 3.
    3. NO < Dual-zone AUTO A/C >:  Go to  Step 5.
  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.17: As air mix damper motor 

    Q: Is the check result normal? 

    1. YES:  This diagnosis is complete.
    2. NO:  Go to Step 4.
  4. STEP 4. Check of open circuit in IG1, A/DA, A/DA', A/DB, A/DB' line between air mixing damper control motor connector and heater controller assembly (A/C-ECU) connector. 

    Q: Is the check result normal? 

    1. YES:  Go to  Step 9.
    2. NO:  Repair the connector(s) or wiring harness.
  5. STEP 5. 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.16: Dr air mix damper motor 

    Q: Is the check result normal? 

    1. YES:  Go to  Step 7.
    2. NO:  Go to Step 6.
  6. STEP 6. Check of open circuit in IG1, A/DA, A/DA', A/DB, A/DB' line between air mixing damper control motor connector (driver's side) and heater controller assembly (A/C-ECU) connector. 

    Q: Is the check result normal? 

    1. YES:  Go to  Step 9.
    2. NO:  Repair the connector(s) or wiring harness.
  7. STEP 7. 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.17: As air mix damper motor 

    Q: Is the check result normal? 

    1. YES:  This diagnosis is complete.
    2. NO:  Go to Step 8.
  8. STEP 8. Check of open circuit in IG1, A/PA, A/PA', A/PB, A/PB' line between air mixing damper control motor connector (passenger's side) and heater controller assembly (A/C-ECU) connector. 

    Q: Is the check result normal? 

    1. YES:  Go to Step 9.
    2. NO:  Repair the connector(s) or wiring harness.
  9. STEP 9. Replace the air mixing damper control motor, and recheck the trouble symptom. 

    Check that A/C outlet air temperature can be adjusted.

    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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