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Inspection Procedure 4

Inspection Procedure 4 (Radiator fan does not operate [2.4L ENGINE])











Radiator Fan Drive Circuit





Circuit Operation
- The fan control module is powered from fusible link number 4.
- The ECM or PCM judges the required revolution speed of the radiator fan motor, using the input signals transmitted from A/C switch, automatic compressor controller, vehicle speed sensor and engine coolant temperature sensor. The ECM or PCM activates the fan control module to drive the radiator 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 ECM or PCM.

Troubleshooting Hints
- Malfunction of fusible link
- Malfunction of fan control relay
- Malfunction of fan control module
- Malfunction of ECM or 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 module 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.
Then 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 relay 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 ECM connector C-35 M/T> or PCM connector C-39 ACT>.
1) Connect the ECM connector C-35 [M/T] or PCM connector C-39 [A/T].
2) Start the engine and run it at idle.





3) Measure the voltage between terminal number 21 [M/T] or 18 [A/T] and ground.
- Voltage should be 0.7 volt or more (When radiator fan is operating)
If abnormal, go to Step 10.
If normal, go to Step 11.

STEP 10. Check the harness wire between ECM connector C-35 [M/T] or PCM connector C-39 [A/T] and fan control module connector A-30.








If any harness wire between ECM connector C-35 [M/T] or PCM connector C-39 [A/T] and fan control module connector A-30 is damaged, repair or replace it. Then go to Step 12.
If harness wires are 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 ECM connector C-35 [M/T] or PCM connector C-39 [A/T].
1) Connect the ECM connector C-35 [M/T] or PCM connector C-39 [A/T].
2) Turn the ignition switch to "ON."





3) Pull out pin 21 [M/T] or 18 [A/T] to disconnect it.
- The radiator fan motor operates.
If radiator fan motor does not operate, replace the radiator fan motor and fan control module assembly. Then go to Step 12.
If radiator fan motor operates, replace the ECM or 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 operates correctly.

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