35 Low Speed Fan Control Relay Circuit - (P 1490)

35 LOW SPEED FAN CONTROL RELAY CIRCUIT - (P 1490)





The Powertrain Control Module (PCM) operates the low speed radiator fan relay by providing a ground for the relay's electromagnet through pin 19, 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

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

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

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