Question about 2002 Jeep Grand Cherokee

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2002 jeep grande cherokee check engine light

After changing the cooling fan relay switch the check engine light is on now and won't go out. How can I turn it off?

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  • Anonymous Jan 29, 2009

    brought new gas cap, but when i fill the tank and the gas is about half full the check engine light comes on, sometimes it goes off by its self after a few startes.

  • Anonymous Mar 15, 2014

    no voltage from fan switch to relay mod. 2004 grand cherokee 4.7

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A common problem on many of the new cars is that when a person gets gas, they don't tighten up the gas cap. This will turn on the check engine light. Did you get gas recently? Another option is to see what code is stored in the ECU that turned the light on. This is done with a scanner tool. If you do not have a scanner, then have a dealer look at it.

Posted on Nov 07, 2008

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1 Answer

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Does it overheat? Which engine does your jeep have? If it has the 4.0, then it has an electrical cooling fan and the control relay most of the times fries. Its hidden under the bumper cover under the right hand headlight (seen from drivers position). Many time this relay fries due to the fan which is drawing too much current.
If your jeep has the 4.7, then it has a hydraulic cooling fan. That fan always idles (300 rpm) when the engine runs and will ramp up when the engine temperature gets too high. There is a control solenoid for this fan, but when its bad, then you should have the check engine light. Check for fault codes using the key dance: ignition switch off/run three times and leave in run at the third time. The odometer will show "DONE" when all ok, or any fault code(s).

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