DTC P0480: Cooling Fan Relay Circuit: Condition

WARNING: This page is about a different car, the 2002 Mazda Protege5 and 2002 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.

DTC is set when cooling fan relay coil control circuit input is too low or too high. This is a continuous monitor. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:

Cooling fan relay malfunction.
Open circuit between cooling fan relay and main relay.
Open or short circuit between cooling fan relay and PCM.
PCM malfunction.