P1490

Tests 1 - 2:

Tests 3 - 6:

Tests 7 - 8:

SYMPTOM
P1490-LOW SPEED FAN CONTROL RELAY CIRCUIT

WHEN MONITORED
With the ignition ON. Battery voltage greater than 10 volts.

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

POSSIBLE CAUSES
- Low Speed Radiator Fan Relay Intermittent Operation
- Intermittent Condition
- Fused Ignition Switch Output Circuit
- Low Speed Radiator Fan Relay Resistance
- Low Speed Radiator Fan Relay Control Circuit Open
- Low Speed Radiator Fan Relay Control Circuit Short To Ground
- PCM