Question about 1996 Jeep Cherokee Sport

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A 30amp fuse keeps blowing. the engine turns over but will not start but the electric cooling fan keeps running with the ignition on and engine cold My vehicle is a 1996 4.0lt cherokee jeep sports petrol

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  • David Haime Oct 06, 2009

    My vehicle had it's MOT last Thursday having replaced 3 tyres and was running perfectly up to 9pm Friday evening. I had to deliver some bits to the other side of the city and I started the engine to come back home which only lasted 1sec. and that was it. Everything works except the engine which just turns over whit no spark. It was then that I noticed that the electric cooling fan started when the iignition was which on and that did not happen before. The 30amp fuse that had blown looking at the fuse box from the front was the second one towards me on the left side of the box. The first one working from the bulkhead towards the front is a 60amp. I hope you can make sense of this as at present the car is in a lockup 1/4 mile away.

  • David Haime Oct 06, 2009

    Hello I called the RAC out and I gather he tried the get a spark from one of the plug leads. Being very late at night and pick black he said I had no spark and called a recovery to get me home. I foregot to say that I did put in another fuse this morning and switched the igintion on ( cooling fan was off) but as soon as I turned the key to start the new fuse blow and the cooling fan started. I will in the morning have a look inside the fuse box lid and come back to you with any details.

  • David Haime Oct 08, 2009

    Hello Sorry took so long in getting back to you as we eventually found the fault and have been renewing wiring. We checked all the wiring circuits from the diagram you sent me and it all checked out ok but the fuse still blow.So working in the dark as they say I started trying to work out what was operated when the ignition was switch on. The Ignition system was dead at a rough diagram I got from the local Jeep dealer I noticed that there was a automatic shutdown relay. If this relay shut down the ignition then it may well shut down the fuel pump so that is where I started. I started checking the wiring and conections from the fuel tank and eventally found the fault under the rear seat on the passengers side. The wiring passes though metal panel and then under the carpet to the front. Where it pasted through the panel it must have been rubbing for a long time and it was the main feed to the fuel pump that had shorted out. I have replaced all the damaged wiring and fitted rubber seals where this harness passes through this panel on the nearside and the offside. Fitted a new fuse and so far fingers crossed it has not blown and the vehicle is mobile again.

    I would like to thank you for all the help you gave me one last request if I may ask. Could you get one or suggest where I could get a full wiring diagram showing what the fuse's feed as the workshop manuals only show the lighting circuits.


  • Terry Strange Jun 06, 2012

    Mine Cherokee was doing the same thing, I found that the wire that comes out of the rail on top of the motor (injector wires) and goes down behind the power steering pump to the OXYGEN SENSOR had contacted the exhaust at #1 cylinder, melting the insulation and gounding out one of the wires. Copper wire was fine, just *****. This 30 amp fuse would blow when I'd hit a bump, Jeep would die. Taped wires up and installed new black heat shielding. Tie wrapped wire away from exhaust. Haven't had any more trouble.



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You have an engine fan sensor faulty on the fan circuit(shorted sensor) or a back-fed ground re feeding it , the 30 amp fuse is for what circuit??? the no start could be an ecm fuse of 5 amps, then it could be the coil packs in the ignition..........please tell me what the 30 amp fuse controls, then maybe we can continue on with your issue

Posted on Oct 09, 2009

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Let me know if you can open this link. It is the diagram that you should check out for a short in a wire that is acusing your problem.

Posted on Oct 07, 2009

  • Greg Bernett
    Greg Bernett Oct 07, 2009

    Looking up another diagram....thank you for the added info! This helps a lot!!!


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Which 30amp fuse? Check your fuse panel cover for info on which fuse or your manual in the fuse section.... Start there as it could be 100 different things why this is happening so we need to start with the first obvious sign (the fuse blowing) and it will lead us to something. When did it start and has anything happened before this started, accident, damage, replaced radio anyting other then driving the car?

Posted on Oct 06, 2009

  • James Brooks
    James Brooks Oct 06, 2009

    Yeah, unfortunately I need more info on what exactly the fuse is.. When you get a chance take a look the panel or manual to see exactly what that fuse is. The cooling fan can come on when the motor is not running (it is thermally controlled) so that doesnt say much. Also did you confirm no spark when starting, if so how did you verify no spark (test coil pack, igniton module or pulling a spark plug while starting)?? I would not say its no spark without physically testing for a no spark condition..

  • James Brooks
    James Brooks Oct 09, 2009

    The only place to get that info would be a dealer service manual. A Chiltons/Haynes would not be that detailed but a dealer Emissions/electrical manual would show wiring and color codes as well..


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