35 High Speed Fan Control Relay Circuit - (P 1489)

35 HIGH SPEED FAN CONTROL RELAY CIRCUIT - (P 1489)





The Powertrain Control Module (PCM) operates the high speed radiator fan by providing a ground path for the relay through pin 57, when the proper parameters have been met from the Engine Coolant Temperature (ECT) sensor, Vehicle Speed Sensor (VSS), and A/C sense circuit.

ENABLING CONDITIONS
- Battery Voltage at least 10 volts
- Ignition voltage supplied to the PCM

A Diagnostic Trouble Code (DTC) is stored when the PCM recognizes an open or short circuit for a period of three seconds in the high speed radiator fan relay's electromagnet or its related circuit.

Only vehicles equipped with automatic transaxles are equipped with a two speed fan. The relay for the high speed fan operation is installed in both automatic and manual transaxle packages. On vehicles equipped with manual transaxies, the relay, when energized, doesn't apply voltage to any circuit.

This malfunction could possibly be caused by problems with any of the following components:

- High speed radiator fan relay
- High speed radiator fan relay's electromagnet wiring or related connectors (open or short)
- PCM