P1490 Low Speed Fan Control Relay Circuit

SYMPTOM
P-1490 LOW SPEED FAN CONTROL RELAY CIRCUIT

WHEN MONITORED
With the ignition key in the run position and battery voltage above 10 volts.

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

POSSIBLE CAUSES
- Ignition switch output circuit open
- Low speed fan relay defective
- Low speed fan control relay wiring harness intermittent defect
- Low speed fan control relay wiring harness observable defect
- Low speed fan relay control circuit open
- Low speed fan relay control circuit short to ground
- PCM defective (low speed fan rly ctrl ckt)