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Home >> Mitsubishi >> 2010 >> Lancer ES, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 33 (Heating, Air Conditioning And Ventilation -- Lancer Evolution) >> Auto A/C Diagnosis >> Symptom Procedures >> INSPECTION PROCEDURE 5: Blower Air Amount cannot be Changed >> Diagnosis

INSPECTION PROCEDURE 5: Blower Air Amount cannot be Changed: Diagnosis

WARNING: This page is about a different variant/trim than selected.

Required Special Tools: 

  1. STEP 1. Check power transistor connector C-119 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is power transistor connector C-119 in good condition? 

    1. YES:  Go to Step 2.
    2. NO:  Repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION . The blower motor should operate normally.
  2. STEP 2. Measure the resistance at power transistor connector C-119. 
    1. Disconnect power transistor connector C-119, and measure the resistance at the wiring harness side.
    2. Measure the resistance value between terminal 1 and ground.

      OK: The measured value should be 2 ohms or less 

      Q: Does the measured resistance value correspond with this range? 

      1. YES:  Go to Step  4.
      2. NO:  Go to Step 3.
        Fig 1: Measuring Resistance Value Between Terminal 1 And Ground
        G05397365Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  3. STEP 3. Check the wiring harness between power transistor connector C-119 (terminal 1) and ground. 
    • Check the power transistor ground line for open circuit.

      Q: Is the wiring harness between power transistor connector C-119 (terminal 1) and ground in good condition? 

      1. YES:  It can be assumed that this malfunction is intermittent. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .
      2. NO:  Repair the wiring harness. The blower motor should operate normally.
  4. STEP 4. Check A/C-ECU connector C-22 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is A/C-ECU connector C-22 in good condition? 

    1. YES:  Go to Step 5.
    2. NO:  Repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION . The blower motor should operate normally.
  5. STEP 5. Check the wiring harness between A/C-ECU connector C-22 (terminals 1 and 2) and power transistor connector C-119 (terminals 2 and 4). 
    • Check the A/C-ECU signal line for open and short circuit.

      Q: Is the wiring harness between A/C-ECU connector C-22 (terminals 1 and 2) and power transistor connector C-119 (terminals 2 and 4) in good condition? 

      1. YES:  Go to Step 6.
      2. NO:  Repair the wiring harness. The blower motor should operate normally.
  6. STEP 6. Replace the power transistor and check the trouble symptom again 

    Check the trouble symptom again.

    Q: Is the check result satisfactory? 

    1. YES:  The procedure is complete.
    2. NO:  Replace the A/C-ECU.
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