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Home >> Mitsubishi >> 2008 >> Lancer L4-2.0L (4B11) >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Cooling System >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Inspection Procedure 3

Inspection Procedure 3

Inspection Procedure 3: Radiator Fan and Condenser Fan do not Operate








CIRCUIT OPERATION
^ Battery voltage is applied to the radiator fan relay (terminal 3), fan control relay (terminal 1), and condenser fan relay (terminal 1).
^ ETACS-ECU (terminal 2, 8, and 9) turns ON the power transistor in the unit to apply current to the radiator fan relay, fan control relay, and condenser fan relay, thus turning ON the relays.
^ When the radiator fan relay is turned ON and the fan control relay is also turned ON, battery voltage is applied from the radiator fan relay (terminal 2) to the radiator fan motor (terminal 1).
^ When the condenser fan relay is turned ON, battery voltage is applied from the condenser fan relay (terminal 3) to the condenser fan motor (terminal 1).

FUNCTION
^ When the radiator fan relay is turned ON, the radiator fan motor and condenser fan motor rotate at a low speed.
^ When the radiator fan relay, fan control relay, and condenser fan relay are turned ON, the radiator fan motor and condenser fan motor rotate at a high speed.

TROUBLESHOOTING HINTS
^ Malfunction of fusible link
^ Malfunction of radiator fan relay
^ Malfunction of fan control relay
^ Malfunction of condenser fan relay
^ Malfunction of radiator fan motor
^ Malfunction of condenser fan motor
^ Malfunction of relay box
^ Malfunction of ETACS-ECU
^ Damaged wiring harness or connector

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III other system diagnosis codes
Confirm whether the diagnosis codes are output from ETACS-ECU.

Q: Is the diagnosis code output?
YES: Perform the troubleshooting of ETACS-ECU.
NO: Go to Step 2.

STEP 2. Check the cooling fan relay.
Q: Is the check result normal?
YES: Go to Step 3.
NO: Replace the relay.

STEP 3. Connectors check: A-23X condenser fan relay connector, A-26X radiator fan relay connector and A-28X fan control relay connector.
Check for the contact with terminals.

Q: Is the check result normal?
YES: Go to Step 4.
NO: Repair the defective connector.

STEP 4. Check the cooling fan motor.
Refer to COOLING FAN MOTOR CHECK. Testing and Inspection

Q: Is the check result normal?
YES: Go to Step 5.
NO: Replace the fan motor.

STEP 5. Connectors check: A-40 condenser fan motor connector and A-35 radiator fan motor connector.
Check for the contact with terminals.

Q: Is the check result normal?
YES: Go to Step 6.
NO: Repair the defective connector.

STEP 6. Measure the voltage at radiator fan relay connector A26X.
1) Remove the radiator fan relay, and measure at relay box side.
2) Measure the voltage between terminal 3 and earth. Measure the voltage between terminal 4 and earth.
OK: System voltage

Q: Is the check result normal?
YES: Go to Step 8.
NO: Go to Step 7.

STEP 7. Check the harness between radiator fan relay connector A-26X (terminal 3, 4) and fusible link number 29.
^ Check the power supply line for short or open circuit.

Q: Is the check result normal?
YES: An intermittent malfunction is suspected.
NO: Repair the wiring harness.

STEP 8. Measure the voltage at fan control relay connector A28X.
1) Remove the fan control relay, and measure at relay box side.
2) Measure the voltage between terminal 1 and earth.
OK: System voltage

Q: Is the check result normal?
YES: Go to Step 10.
NO: Go to Step 9.

STEP 9. Check the harness between fan control relay connector A-28X (terminal 1) and fusible link number 28.
^ Check the power supply line for short or open circuit.

Q: Is the check result normal?
YES: An intermittent malfunction is suspected.
NO: Repair the relay box.

STEP 10. Measure the voltage at condenser fan relay connector A-23X.
1) Remove the condenser fan relay, and measure at relay box side.
2) Measure the voltage between terminal 1 and earth. Measure the voltage between terminal 4 and earth.
OK: System voltage

Q: Is the check result normal?
YES: Go to Step 12.
NO: Go to Step 11.

STEP 11. Check the harness between condenser fan relay connector A-23X (terminal 1, 4) and fusible link number 28.
^ Check the power supply line for short or open circuit.

Q: Is the check result normal?
YES: An intermittent malfunction is suspected.
NO: Repair the relay box.

STEP 12. Check the harness between radiator fan relay connector A-26X (terminal 2) and radiator fan motor connector A35 (terminal 1).
^ Check the output line for short or open circuit.

Q: Is the check result normal?
YES: Go to Step 13.
NO: Repair the wiring harness.

STEP 13. Check the harness between fan control relay connector A-28X (terminal 5) and radiator fan motor connector A-35 (terminal 2).
^ Check the output line for short or open circuit.

Q: Is the check result normal?
YES: Go to Step 14.
NO: Repair the wiring harness.

STEP 14. Measure the resistance at fan control relay connector A28X.
1) Remove the fan control relay, and measure at relay box side.
2) Measure the resistance between terminal 4 and body earth.
OK: Continuity (Less than 2 ohms)

Q: Is the check result normal?
YES: Go to Step 16.
NO: Go to Step 15.

STEP 15. Check the harness between fan control relay connector A-28X (terminal 4) and earth.
^ Check the earth line for open circuit.

Q: Is the check result normal?
YES: An intermittent malfunction is suspected.
NO: Repair the wiring harness.

STEP 16. Check the harness between fan control relay connector A-28X (terminal 2) and condenser fan relay connector A-23X (terminal 3).
^ Check the output line for short or open circuit.

Q: Is the check result normal?
YES: Go to Step 17.
NO: Repair the wiring harness.

STEP 17. Check the harness between condenser fan relay connector A-23X (terminal 3) and condenser fan motor connector A-40 (terminal 1).
^ Check the output line for short or open circuit.

Q: Is the check result normal?
YES: Go to Step 18.
NO: Repair the wiring harness.

STEP 18. Measure the resistance at condenser fan motor connector A-40.
1) Remove the condenser fan motor connector, and measure at harness side.
2) Check the continuity between terminal 2 and body earth.
OK: Continuity (Less than 2 ohms)

Q: Is the check result normal?
YES: Go to Step 20.
NO: Go to Step 19.

STEP 19. Check the harness between condenser fan motor connector A-40 (terminal 2) and earth.
^ Check the earth line for open circuit.

Q: Is the check result normal?
YES: An intermittent malfunction is suspected.
NO: Repair the wiring harness.

STEP 20. Check the harness between ETACS-ECU connector C312 (terminal 2) and radiator fan relay connector A-26X (terminal 1).
^ Check the ETACS-ECU input line for open circuit.

Q: Is the check result normal?
YES: Go to Step 21.
NO: Repair the wiring harness.

STEP 21. Check the harness between ETACS-ECU connector C312 (terminal 9) and fan control relay connector A-28X (terminal 3).
^ Check the ETACS-ECU input line for open circuit.

Q: Is the check result normal?
YES: Go to Step 22.
NO: Repair the wiring harness.

STEP 22. Check the harness between ETACS-ECU connector C312 (terminal 8) and condenser fan relay connector A-23X (terminal 2).
^ Check the ETACS-ECU input line for open circuit.

Q: Is the check result normal?
YES: Go to Step 23.
NO: Repair the wiring harness.

STEP 23. M.U.T.-III actuator test
Conduct the MPI system actuator test to check that the fan works.
^ Item 14: Cooling fan

Q: Is the check result normal?
YES: An intermittent malfunction is suspected.
NO: Replace the ETACS-ECU. Then go to Step 24.

STEP 24. Retest the system.
Check that the radiator fan and the condenser fan work.

Q: Is the check result normal?
YES: The procedure is complete.
NO: Return to Step 1.
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