Radiator Cooling Fan Motor: Testing and Inspection

INSPECTION

Radiator Fan Motor and Condenser Fan motor





1. Check to be sure that the radiator fan rotates when battery voltage is applied between the terminals.





2. Check to see that abnormal noises are not produced while the motor is turn in a.

Cooling fan control system





ECM Controls the cooling fan in 3 steps (LO/MIDDLE/HI) according to the vehicle speed, the air-conditioning load and engine coolant temperature.





ECM Control logic

Radiator Fan Motor Relay





1. Remove the radiator fan motor relay (HI and LO) from the relay box in engine room.





2. Check the continuity the terminals "86" and "85" with an ohmmeter.
3. Apply DC12 V to the terminals "86" and ground the terminal 85".
4. Check for continuity between the terminals "87" and "30".