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Home >> Mitsubishi >> 2003 >> Eclipse L4-2.4L SOHC >> 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





[2.4L Engine]

[3.0L Engine]





Part 1 of 2





Part 2 of 2

CIRCUIT OPERATION
- The fan controller is powered from fusible link number 2.
- The ECM [M/T] or PCM [A/T] judges the required revolution speed of radiator fan motor and condenser fan motor using the input signals transmitted from A/C switch, automatic compressor controller, vehicle speed sensor and engine coolant temperature sensor. The ECM [M/T] or PCM [A/T] activates the fan controller to drive the radiator fan motor and condenser fan motor.

TECHNICAL DESCRIPTION
- The cause could be a malfunction of the fan controller power supply or ground circuit.
- The cause could also be a malfunction of the fan controller or the ECM [M/T] or PCM [A/T].

TROUBLESHOOTING HINTS
- Malfunction of fusible link
- Malfunction of fan control relay
- Malfunction of fan controller
- Malfunction of ECM [M/T] or PCM [A/T]
- Damaged wiring harness or connector

DIAGNOSIS

Required Special Tool:
- MB991223: Harness Set





STEP 1. Check the circuit at fan controller connector A-30.
1. Disconnect fan controller connector A-30, and measure at the harness side connector.
2. Measure the voltage between terminal number 3 and ground.
- When the ignition switch is turned to "ON" position, voltage should be battery positive voltage.
Q: Is the voltage battery positive voltage when the ignition switch is turned to "ON" position?
YES: Go to Step 7.
NO: Go to Step 2.

STEP 2. Check the fan control relay.
Q: Is the fan control relay in good condition?
YES: Go to STEP 3.
NO: Replace it, then go to Step 10.








STEP 3. Check for continuity between fusible link number 2 and fan control relay connector A-09X.
Q: Are the harness wires between fusible link number 2 and fan control relay connector A-09X damaged?
YES: Repair or replace them, then go to Step 12.
NO: Go to Step 4.








STEP 4. Check for continuity between fan control relay connector A-09X and fan controller connector A-30.
Q: Are the harness wires between fan control relay connector A-09X and fan controller connector A-30 damaged?
YES: Repair or replace them, then go to Step 12.
NO: Go to Step 5.





STEP 5. Check for continuity between MFI relay connector A-18X and fan control relay connector A-09X.
Q: Are the harness wires between MFI relay connector A-18X and fan control relay connector A-09X damaged?
YES: Repair or replace them, then go to Step 12.
NO: Go to Step 6.





STEP 6. Check for continuity between fan control relay connector A-09X and ground.
Q: Are the harness wires between fan control relay connector A-09X and ground damaged?
YES: Repair or replace them, then go to Step 12.
NO: Go to Step 7.





STEP 7. Check the circuit at fan controller connector A-30.
1. Disconnect fan controller connector A-30, and measure at the harness side connector.
2. Measure the resistance between terminal number 1 and ground.
Q: Is the resistance less than 2 ohm?
YES: Go to Step 9.
NO: Go to Step 8.





STEP 8. Check the harness wire between fan controller connector A-30 and ground.
Q: Are the harness wires between fan controller connector A-30 and ground damaged?
YES: Repair or replace them, then go to Step 12.
NO: Go to Step 9.





STEP 9. Check the circuit at ECM connector C-49 <2.4L-M/T>, C-51 <3.0L-M/T> or PCM connector C-50 <2.4L-A/T>, C-52 <3.0L-A/T>.
1. Connect ECM connector C-49 <2.4L-M/T>, C-51 <3.0L-M/T> or PCM connector C-50 <2.4L-A/T>, C-52 <3.0L-A/T>.
2. Start the engine and allow it to idle.
3. Measure the voltage between terminal number 21 <2.4L-M/T> or 18 <2.4L-A/T, 3.0L> and ground.
Q: Is the voltage 0.7 volt or more when the radiator fan is operating?
YES: Go to Step 11.
NO: Go to Step 10.

STEP 10. Check the harness wire between ECM connector C-49 <2.4L M/T>, C-51 <3.0L-M/T> or PCM connector C-50 <2.4L-A/T>, C-52 <3.0L-A/T> and fan controller connector A-30.





NOTE: If intermediate connector C-07 is damaged, repair or replace it.








Q: Are the harness wires between ECM connector C-49 <2.4L-M/T>, C-51 <3.0L-M/T> or PCM connector C-50 <2.4L-A/T>, C-52 <3.0L-A/T> and fan controller connector A-30 damaged?
YES: Repair or replace them, then go to Step 12.
NO: Go to Step 11.





STEP 11. Check the fan control module at ECM connector C-49 <2.4L-M/T>, C-51 <3.0L-M/T> or PCM connector C-50 <2.4L-A/T>, C-52 <3.0L-A/T>.
1. Disconnect ECM connector C-49 <2.4L-M/T>, C-51 <3.0L-M/T> or PCM connector C-50 <2.4L-A/T>, C-52 <3.0L-A/T>.
2. Pull out pin 21 <2.4L-M/T> or 18 <2.4L-A/T, 3.0L> to disconnect it.
3. Reconnect ECM connector C 49 <2.4L-M/T>, C-51 <3.0L-M/T> or PCM connector C-50 <2.4L-A/T>, C-52 <3.0L-A/T> with pin 21 <2.4L-M/T> or 18 <2.4L-A/T, 3.0L> still removed.
4. Turn the ignition switch to "ON" position.
Q: Do the radiator fan motor and condenser fan motor operate?
YES: Replace the ECM [M/T] or PCM [A/T]. Then go to Step 12.
NO: Replace the radiator fan motor and fan control module assembly. Then go to Step 12.

STEP 12. Check the symptoms.
Q: Do the radiator fan and condenser fan operate correctly?
YES: This diagnosis is complete.
NO: Return to Step 1.

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