Possible Causes
Faulty Fan 1 Relay
Fan 1 Relay harness is open or shorted
Fan 1 Relay circuit poor electrical connection
Faulty Fan 1
Fan 1 harness is open or shorted
Fan 1 circuit poor electrical connection
Faulty Engine Control Module (ECM)
الأسباب المحتملة
Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
Radiator fan inoperative
Possible engine overheating
الأعراض المحتملة
Description
The Engine Cooling Fan is normally controlled by the Engine Control Module (ECM). Some cooling fans can be controlled by a pulse width modulated control voltage. This allows for varying speeds depending on the rate of engine cooling required. Conversely, where two fans are used on a vehicle, they can either be powered up in series or in parallel. When in series both fans will rotate at low speed, when connected in parallel then both fans will operate at full speed. In the event of a temperature sensor failure, the fan will operate at full output.
