Inspection Procedure 5

INSPECTION PROCEDURE 5: Radiator Fan does not Operate

Radiator Fan and Condenser Fan Drive Circuit
Inspection Procedure 3

CIRCUIT OPERATION
- The fan controller is powered from fusible link number 2.
- The ECU [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 ECU [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 radiator fan motor or an open circuit between the fan controller and the radiator fan motor.

TROUBLESHOOTING HINTS
- Malfunction of radiator fan motor
- Malfunction of fan controller

DIAGNOSIS

STEP 1. Check the radiator fan motor.
Q: Is the radiator fan in good condition?
YES: Go to STEP 2.
NO: Replace the radiator fan motor, then go to Step 3.

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

STEP 3. Check the symptoms.
Q: Does the radiator fan operate correctly?
YES: This diagnosis is complete.
NO: Return to Step 1.