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Home >> Mitsubishi >> 2001 >> Galant GTZ V6-3.0L 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

















CIRCUIT OPERATION
- The fan controller is powered from fusible link number 5.
- The PCM 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 PCM 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 PCM.

TROUBLESHOOTING HINTS
- Malfunction of fusible link
- Malfunction of fan control relay
- Malfunction of fan controller
- Malfunction of PCM
- 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 5 and fan control relay connector A-13X.
Q: Are the harness wires between fusible link number 5 and tan control relay connector A-13X 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-13X and fan controller connector A-30.
Q: Are the harness wires between fan control relay connector A-13X 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-21 X and fan control relay connector A-13X.
Q: Are the harness wires between MFI relay connector A21X and fan control relay connector A-13X 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-13X and ground.
Q: Are the harness wires between fan control relay connector A-13X and ground damaged?
YES: Repair or replace them, then go to Step 12
NO: There is no action to be taken.





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 toStep8





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: There is no action to be taken.





STEP 9. Check the circuit at PCM connector C-39.
1) Connect PCM connector C-39.
2) Start the engine and allow it to idle.
3) Measure the voltage between terminal number 18 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 PCM connector C-39 and fan controller connector A-30.

NOTE: If intermediate connector C-04 is damaged, repair or replace it.








Q: Are the harness wires between PCM connector C-39 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 controller at PCM connector C-39.
1) Disconnect PCM connector C-39.
2) Pull out pin 18 to disconnect it.
3) Reconnect PCM connector C-39 with pin 18 still removed.
4) Turn the ignition switch to "ON. position.
Q: Do the radiator fan motor and condenser fan motor operate?
YES: Replace the PCM. Then go to Step 12.
NO: Replace the radiator fan motor and fan controller 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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