DTC P1489: High Speed Fan Control Relay Circuit: Description

Radiator high speed fan relay voltage is monitored when ignition is on and battery voltage is more than 10 volts. DTC will set in PCM memory if PCM detects an open or shorted condition in high speed radiator fan control relay circuit. Possible causes for DTC to set are: defective high speed radiator fan relay, defective PCM, or defective connectors or wiring.