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P1491 - Radiator Fan Control Relay Circuit Open Or Shorted
When monitored: with the ignition key on, battery voltage greater than 10.0 volts and the pcm requests the radiator fan to be turned on. Set condition: an open or shorted circuit is detected in the radiator fan relay control circuit.
Possible causes radiator fan ctrl rly circuit wire harn intermittent defect radiator fan ctrl rly circuit wire harn observable defect radiator fan relay ground circuit open rad fan relay control circuit open radiator fan relay control circuit short to ground rad fan control relay defective pcm defective
There is no radiator fan sensor, the fan is controlled on and off from the cars ECM (computer) which takes the reading from the engine's temperature sensor. If you think you have radiator fan issues, check your fuses under the hood and the relay fan to your radiator, once you have determined that there in good working order, move on to inspecting for a bad wire harness to the radiator fan but take caution to the fan turning on hot engine parts if your going to have the engine running.
Turning on the A/C with the engine running should also turn the fans o, if they don't come on then inspect your fuses as mentioned above and relays.
Thank you for using fixya and be safe.
The radiator fan may not be blowing.
Idle car with parking brake engaged.
Turn OFF Air Conditioner
Pop open hood and look at the radiator fan.
It is not spinning.
Turn ON Air Conditioner and look at fan.
The fan MUST be spinning.
Replace the "Radiator fan" relay switch.
Check primary fuses and replace as needed.
1. radiator fan not turning. Check cooling fan fuse. Check loose/disconnected electric cable at radiator fan. Fan may be burned out.
2. Turn ON engine with A/C OFF.
3. Turn ON A/C to see if radiator fan starts up. It is supposed to turn whenever the A/C is on.
There is a cable connecting from radiator fan to thermostat switch.
Thermostat switch located at near engine block, you can trace it from radiator hose to engine block, there is a terminal connected to thermostat.
To check wheter fan is ok or not, pull out/disconnet the terminal, radiator fan will be turned on, if not, this could be a problem with radiator fan.
Otherwise you should clean terminal or replace thermostat switch.
Well the first thing I can tell you is that the radiator fan should kick on as soon as you turn on the a/c. That's because of the extra strain it puts on the engine. So, if you don't see or hear the fan go on with the a/c, it's probably dead. You could also unplug the fan and run a jumper wire off of the battery to see if it goes on.