Question about 2003 Jeep Grand Cherokee

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P1491 diagnostics code for 2003 Jeep Grand Cherokee

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  • Jeep Master
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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

Posted on Nov 10, 2010

  • Duane Wong
    Duane Wong Nov 10, 2010

    That's a very thorough run down on the procedure to follow in troubleshooting and repairing the fan relay malfunction.

    You should have that as a tip.

  • Jeff Turcotte
    Jeff Turcotte Nov 10, 2010

    I do have this as part of my thermostat/cooling tip, but I only use that when the question has less info. In this case, the code has told me that the sensor is good and it's only an open in the power circuit. I agree that it would be better to not have to write solutions it over and over, but it's hard to write tips for many specific scenarios. Are you having fun with FixYa?

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  • Jeep Master
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P1491 rad fan control circuit

This will make the car overheat if run in hot weather too long and the fan doesn't turn on at the right times.

Posted on Nov 10, 2010

  • Duane Wong
    Duane Wong Nov 10, 2010

    Yes, I like the format and usefulness of the information I find here, and helping people out. :)

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.

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