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Home >> Mitsubishi >> 2010 >> Lancer ES, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 44 (Engine Cooling System - Lancer Evolution) >> Engine Cooling Diagnosis >> Symptom Procedures >> Inspection Procedure 3: Radiator Fan And Condenser Fan Do Not Operate >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools: 

CAUTION: If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code (DTC) may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to TROUBLE CODE DIAGNOSIS ).
  1. STEP 1. Using scan tool MB991958, check the CAN bus line diagnostics. 

    Use scan tool to diagnose the CAN bus line (Refer to EXPLANATION ABOUT THE SCAN TOOL CAN BUS DIAGNOSTICS ).

    Q: Is the diagnostic trouble code set? 

    1. YES:  Go to Step 2.
    2. NO:  Repair the CAN bus line (Refer to CAN BUS DIAGNOSTIC TABLE ). Then go to Step  23.
  2. STEP 2. Using scan tool MB991958, check the MFI system actuator test. 

    Using scan tool to check the MFI system actuator test (Refer to DIAGNOSTIC FUNCTION ).

  3. STEP 3. Using scan tool MB991958, read the MFI system DTC. 

    Using scan tool to read the MFI system DTC (Refer to DIAGNOSTIC FUNCTION ).

    Q: Is any DTC set? 

    1. YES:  Repair the MFI system (Refer to DIAGNOSTIC TROUBLE CODE CHART ). Then go to Step  23.
    2. NO:  Go to Step 4.
  4. STEP 4. Using scan tool MB991958, read the ASC system DTC. 

    Using scan tool to read the ASC system DTC (Refer to DIAGNOSTIC FUNCTION ).

    Q: Is any DTC set? 

    1. YES:  Repair the ASC system (Refer to DIAGNOSTIC TROUBLE CODE CHART ). Then go to Step  23.
    2. NO:  Go to Step 5.
  5. STEP 5. Using scan tool MB991958, read the A/C system DTC. 

    Using scan tool to read the A/C system DTC (Refer to DIAGNOSTIC FUNCTION ).

    Q: Is any DTC set? 

    1. YES:  Repair the A/C system (Refer to DIAGNOSTIC TROUBLE CODE CHART ). Then go to Step  23.
    2. NO:  Go to Step 6.
  6. STEP 6. Using scan tool MB991958, read the ETACS system DTC. 

    Using scan tool to read the ETACS system DTC (Refer to DIAGNOSTIC FUNCTION ).

    Q: Is any DTC set? 

    1. YES:  Repair the ETACS system (Refer to DIAGNOSTIC TROUBLE CODE CHART ). Then go to Step  23.
    2. NO:  Go to Step 7.
  7. STEP 7. Measure the terminal voltage at ETACS-ECU connector C-312. 
    1. Disconnect the ETACS-ECU connector C-312, and measure at front wiring harness connector side.
    2. Turn the ignition switch to the "ON" position.
    3. Measure the terminal voltage between ETACS-ECU connector C-312 terminal number 2 and body ground, and between ETACS-ECU connector C-312 terminal number 8 and body ground.

      OK: Battery positive voltage 

      Q: Is the check result normal? 

      1. YES:  Go to Step  13.
      2. NO:  Go to Step 8.
        Fig 1: Measuring Voltage Between ETACS-ECU Connector C-312 Terminals 2, 8 & Ground
        G00523321Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  8. STEP 8. Check the radiator fan relay connector A-35X, condenser fan relay connector A-36X, fan control relay connector A-37X, and ETACS-ECU connector C-312, for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Refer to HARNESS CONNECTOR INSPECTION .

    Q: Is the connectors and terminals in good condition? 

    1. YES:  Go to Step 9.
    2. NO:  Repair or replace the damaged connector. Then go to Step  23.
  9. STEP 9. Check the harness wire between fusible link number 28 and condenser fan relay connector A-36X terminal number 3, between fusible link number 28 and condenser fan relay connector A-36X terminal number 4, between condenser fan relay connector A-36X terminal number 4 and fan control relay connector A-37X terminal number 1, and between fusible link number 29 and radiator fan relay connector A-35X terminal number 3, for damage. 
    • Check harness wire for open/short circuit and damage.

      Q: Is the harness wires in good condition? 

      1. YES:  Go to Step 10.
      2. NO:  Repair or replace the damaged harness wire. Then go to Step  23.
        Fig 2: Locating Fusible Link Number 28 & 29
        G05393609Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  10. STEP 10. Check the harness wire between radiator fan relay connector A-35X terminal number 1 and ETACS-ECU connector C-312 terminal number 2, between condenser fan relay connector A-36X terminal number 1 and ETACS-ECU connector C-312 terminal number 8, and between fan control relay connector A-37X terminal number 3 and ETACS-ECU connector C-312 terminal number 8, for damage. 
    • Check harness wire for open/short circuit and damage.

      Q: Is the harness wires in good condition? 

      1. YES:  Go to Step 11.
      2. NO:  Repair or replace the damaged harness wire. Then go to Step  23.
  11. STEP 11. Check the radiator fan relay, condenser fan relay, and fan control relay. 

    Refer to COOLING FAN RELAY CONTINUITY CHECK  .

    Q: Is the relay in good condition? 

    1. YES:  Go to Step 12.
    2. NO:  Replace the damaged relay. Then go to Step  23.
  12. STEP 12. Check the fusible link number 28 and fusible link number 29. 

    Q: Is the fusible link in good condition? 

    1. YES:  Go to Step  20.
    2. NO:  Replace the damaged fusible link. Then go to Step  23.
  13. STEP 13. Check the radiator fan relay connector A-35X, condenser fan relay connector A-36X, fan control relay connector A-37X, radiator fan motor connector A-45, and condenser fan motor connector A-47, for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Refer to HARNESS CONNECTOR INSPECTION .

    Q: Is the connectors and terminals in good condition? 

    1. YES:  Go to Step 14.
    2. NO:  Repair or replace the damaged connector. Then go to Step  23.
  14. STEP 14. Check the harness wire between fusible link number 28 and condenser fan relay connector A-36X terminal number 4, and between fusible link number 29 and radiator fan relay connector A-35X terminal number 4, for damage. 
    • Check harness wire for open/short circuit and damage.

      Q: Is the harness wires in good condition? 

      1. YES:  Go to Step 15.
      2. NO:  Repair or replace the damaged harness wire. Then go to Step  23.
  15. STEP 15. Check the harness wire between radiator fan relay connector A-35X terminal number 2 and radiator fan motor connector A-45 terminal number 1, and between condenser fan relay connector A-36X terminal number 2 and condenser fan motor connector A-47 terminal number 1, for damage. 
    • Check harness wire for open/short circuit and damage.

      Q: Is the harness wires in good condition? 

      1. YES:  Go to Step 16.
      2. NO:  Repair or replace the damaged harness wire. Then go to Step  23.
  16. STEP 16. Check the harness wire between radiator fan motor connector A-45 terminal number 2 and fan control relay connector A-37X terminal number 2, and between condenser fan motor connector A-47 terminal number 2 and body ground, for damage. 
    • Check harness wire for open/short circuit and damage.

      Q: Is the harness wires in good condition? 

      1. YES:  Go to Step 17.
      2. NO:  Repair or replace the damaged harness wire. Then go to Step  23.
  17. STEP 17. Check the harness wire between fan control relay connector A-37X terminal number 4 and condenser fan motor connector A-47 terminal number 1, and between fan control relay connector A-37X terminal number 5 and body ground, for damage. 
    • Check harness wire for open/short circuit and damage.

      Q: Is the harness wires in good condition? 

      1. YES:  Go to Step 18.
      2. NO:  Repair or replace the damaged harness wire. Then go to Step  23.
  18. STEP 18. Check the radiator fan relay, condenser fan relay, and fan control relay. 

    Refer to COOLING FAN RELAY CONTINUITY CHECK  .

    Q: Is the relay in good condition? 

    1. YES:  Go to Step 19.
    2. NO:  Replace the damaged relay. Then go to Step  23.
  19. STEP 19. Check the radiator fan motor and condenser fan motor. 

    Refer to FAN CONTROL RELAY CHECK  .

    Q: Is the fan motor in good condition? 

    1. YES:  Go to Step 20.
    2. NO:  Replace the damaged fan motor (Refer to REMOVAL AND INSTALLATION  ). Then go to Step  23.
  20. STEP 20. Using scan tool MB991958, read the ETACS system DTC. 

    Using scan tool to read the ETACS system DTC (Refer to DIAGNOSTIC FUNCTION ).

    Q: Is any DTC set? 

    1. YES:  Replace the ETACS-ECU (Refer to ETACS-ECU ). Then go to Step  23.
    2. NO:  Go to Step 21.
  21. STEP 21. Using scan tool MB991958, check the MFI system actuator test. 

    Using scan tool to check the MFI system actuator test (Refer to DIAGNOSTIC FUNCTION ).

  22. STEP 22. Check the symptoms. 

    Q: Does the radiator fan and condenser fan operate normal? 

    1. YES:  An intermittent malfunction is suspected (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    2. NO:  Replace the ECM. Refer to ENGINE CONTROL MODULE (ECM) Then go to Step 23.
  23. STEP 23. Check the symptoms. 

    Q: Does the radiator fan and condenser fan operate normal? 

    1. YES:  The procedure is complete.
    2. NO:  Return to Step  1.
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