P1491 Rad Fan Control Relay Circuit

SYMPTOM
P-1491 RAD FAN CONTROL RELAY CIRCUIT

WHEN MONITORED
With the ignition key on and battery voltage greater than 10 volts.

SET CONDITION
An open or shorted condition is detected in the radiator fan relay control circuit.

POSSIBLE CAUSES
- Fused ignition switch output circuit open
- Radiator fan control relay defective
- Rad fan rly cntrl ckt short to ground
- Radiator fan cntrl rly ckt wir harn inter def
- Radiator fan cntrl rly ckt wrg harn obs def
- Radiator fan relay control circuit open
- PCM defective