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Inspection Procedure 5

Inspection Procedure 5 (Radiator fan and condenser fan do not operate [3.0L ENGINE])











Radiator Fan and Condenser Fan Drive Circuit





Circuit Operation
- The fan control module is powered from fusible link number 4.
- 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 activated the fan control module to drive the radiator fan motor and condenser fan motor.





Technical Description
- The cause could be a malfunction of the fan control module power supply or ground circuit.
- The cause could also be a malfunction of the fan control module or the PCM.

Troubleshooting Hints
- Malfunction of fusible link
- Malfunction of fan control relay
- Malfunction of fan control module
- Malfunction of PCM
- Damaged wiring harness or connector

Diagnosis
Required Special Tool: MB991223: Harness Set

STEP 1. Check the circuit at fan control module connector A-30.
1) Disconnect fan control module 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 on, voltage should be approximately 12 volts (battery positive voltage)
If abnormal, go to Step 2.
If normal, go to Step 7.

STEP 2. Check the fan control relay. Radiator Cooling Fan Motor Relay
If the fan control relay is faulty, replace it. Then go to Step 12.
If normal, go to Step 3.

STEP 3. Check for continuity between fusible link number 4 and fan control relay connector A-13X.





If any harness wire between fusible link number 4 and fan control relay connector A-13X is damaged, repair or replace it.
Then go to Step 12.
If normal, go to Step 4.

STEP 4. Check for continuity between fan control relay connector A-13X and fan control module connector A-30.








If any harness wire between fan control module connector A-13X and fan control module connector A-30 is damaged, repair or replace it.
Then go to Step 12.
If normal, go to Step 5.

STEP 5. Check for continuity between MFI relay and fan control relay connector A-13X.





If any harness wire between MFI relay and fan control relay connector A-13X is damaged, repair or replace it.
Then go to Step 12.
If normal, go to Step 6.

STEP 6. Check for continuity between fan control relay connector A-13X and ground.





If any harness wire between fan control relay connector A-13X and ground is damaged, repair or replace it.
Then go to Step 12.

STEP 7. Check the circuit at fan control module connector A-30.
1) Disconnect fan control module connector A-30, and measure at the harness side connector.





2) Measure the resistance between terminal number 1 and ground.
- Should be less than 2 ohm
If open circuit, go to Step 8.
If less than 2 ohm, go to Step 9.

STEP 8. Check the harness wire between fan control module connector A-30 and ground.





If any harness wire between fan control module connector A-30 and ground is damaged, repair or replace it. Then go to Step 12.

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.
- Voltage should be 0.7 volt or more (When the radiator fan is operating)
If less than 0.7 volt, go to Step 8.
If 0.7 volt or more, go to Step 11.

STEP 10. Check the harness wire between PCM connector C-39 and fan control module connector A-30.








If any harness wire between PCM connector C-39 and fan control module connector A-30 is damaged, repair or replace it. Then go to Step 12.
If harness wire is in good condition, go to Step 11.





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

STEP 11. Check the fan control module at PCM connector C-39.
1) Connect the PCM connector C-39.
2) Turn the ignition switch "ON."





3) Pull out pin 18 to disconnect it.
- The radiator fan motor and condenser fan motor operate.
If radiator fan motor and condenser fan motor do not operate, replace the radiator fan motor and fan control module assembly. Then go to Step 12.
If radiator fan motor and condenser fan motor operate, replace the PCM. On 2000 models, the immobilizer-ECU should be replaced together with it. Then go to Step 12.

STEP 12. Check the symptoms.
Confirm that the radiator fan and condenser fan operate correctly.
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