Principles of Operation
Principles of Operation - 2.3LCooling Fans
The cooling fans are controlled by 3 relays to provide 2 speeds. If DTCs P0480, P0481 or P0482 are present, refer to Computers and Control Systems for diagnosis.
In HIGH speed, voltage is supplied through the following relay to energize both cooling fan motors:
^ High-speed fan control relay
In LOW speed, only the LH fan is initially in operation. After the LH fan has been energized for 5-10 seconds, the RH fan will start automatically through the following relays:
^ Low speed fan control relay
^ Engine cooling fan relay