Hello jhonney21,
The P1491 is Radiator fan control relay circuit code. It is set if an open or short circuit is detected in the radiator fan relay control circuit.
Regards,
netvan
P1491= "radiator fan control relay circuit".
I just went to autozone and they said it is this:
Open or shorted radiator fan relay (~$60 to fix)
Open or shorted circuit condition
ECM defective (~$200 to fix)
Catalitic converter fail, smog control.
SOURCE: check engine light came on, diagnostic code reads
Hi and welcome to FixYa!
P1491 means Radiator Fan Control Relay Circuit Open Or Shorted. You may want to visit the link I provided to deal with the problem.
Please click here http://www.engine-light-help.com/check-engine-light-circuit-testing.html
Hope this helps and thank you for using FixYa! Have a good one!
Trouble Code: P1491
You PCM does not sense current to radiator fan when it turns it on. Is the fan coming on or not? Usually not when you have this code. Problem can be with the fuse, relay, wiring or fan itself. First check the fuse. If good, next try swapping the relay with another one in the engine compartment relay box, such as the horn relay.
Let the car warm up and see if the fan will come on. If yes, get a new relay. If not, either use a test light to see if there is voltage at the fan connector when the engine is on and hot, or else test the fan motor by hotwiring it to the battery. If none of this works, please get back to me for how to troubleshoot the wiring.
Radiator Fan Control Relay Circuit Malfunction
Possible Causes:
Radiator fan control relay circuit is open or shorted to ground
Radiator fan control relay circuit is open (test power to IGN)
Radiator fan control relay is damaged or has failed
PCM has failed
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