Electric fan, P1491 - JeepForum.com
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post #1 of 3 Old 03-26-2013, 03:51 AM Thread Starter
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2001 WJ 
Join Date: Dec 2011
Location: Bishkek
Posts: 18
Electric fan, P1491

On my wj was not an electric fan, the old owner removed it.
check engine light(P1491). I installed the new fan and set the fan relay.

Still light, check engine, start the engine and the fan starts to work immediately. Clear the error (P1491) but it appears again.
The wires are good.
What may be the problem, the bad PCM?

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post #2 of 3 Old 03-27-2013, 06:29 PM
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2000 XJ Cherokee 
Join Date: Apr 2002
Location: out in the garage - Minneapolis
Posts: 25,782
P1491 Rad Fan Control Relay Circuit. An open or shorted condition detected in the radiator fan control relay control circuit. This includes PWM solid state relays.

I would guess that there is a short circuit or open circuit in the wiring that powers the e-fan, or the wiring that tells the PCM to turn the fan on. Check the wires and wire plug at the Coolant Temperature Sensor and test or replace the CTS.


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post #3 of 3 Old 06-06-2013, 05:04 AM Thread Starter
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2001 WJ 
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Bought new PCM, all problem was gone.
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