Question about 1988 Jeep Cherokee

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My buddy has a 1988 Jeep Cherokee with the 4.0L. He was driving it home and it started acting like it was running out of gas. Then it died and wouldn't restart. Now the fuel pump will not turn on,

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  • Jeep Master
  • 5,280 Answers

I kind of agree it may be the ecu. but first, look for a green 20amp fusible link, turning into a red wire. Your wiring diagram shows this fusible link is the power source for the fuel pump relay. It is called Fuse Link G. Should be near the battery.

Posted on Nov 29, 2012

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  • Donnie Parker
    Donnie Parker Nov 29, 2012

    Can't seem to find that wire anywhere. Just solid green, solid red, solid yellow and a fe more but none have fusible links on them. When you turn the key on the relays click like they are supposed to but thats as far as it goes. Also like I sayed before no power to the fan, its supposed to turn on when you turn the key o. Lost all this in the same shot.n.

  • montehammons Nov 30, 2012

    I only have a partial wiring diagram,. but it does show engine controls for '87-'90 with the 4.0L. Shows it as fuse link G, and hot at all times, so find the fuel pump relay, pull it out and check for a terminal there that has power. If not, keep looking for the fuse link. If it does have power there, it must be your ecu.

  • Donnie Parker
    Donnie Parker Dec 01, 2012

    This thing was a basket case when he got it. Wires missing, chopped and replaced with different colors, 1 strand of wire is 3 different colors as it goes lol. He and another buddy pulled every wire out from around the fuel pump relay and even under the dash. They checked, as what they told me, every wire to see if it had power and can only think that it must be the ECU. I let them know what you told me so I guess I'll just sit back and watch this thing burn...I mean get fixed lol. Thank you for your info Monte.

  • montehammons Dec 01, 2012

    cool. I've seen those basket cases before. a real hassle, sorry for the owner.

  • Donnie Parker
    Donnie Parker Dec 01, 2012

    int that the truth. Glad I don't own it lol. I already got enough problems with my 2 trucks but am getting there slowly but surely lol

  • Donnie Parker
    Donnie Parker Dec 01, 2012

    """"aint that the truth"""" stupid keyboard

  • Donnie Parker
    Donnie Parker Dec 08, 2012

    montehammons, He just replaced the ECU and guess what. The same thing. Didn't fix it. He says there is no power going from the firewall towards the fan, which means theres still a big problem sinc its supposed to turn on when he turns the key on. the relays under the hood all work and all have power. Is there maybe a hidden relay somewhere or another possible fusable link that would cause this to happen?

  • Donnie Parker
    Donnie Parker Dec 08, 2012

    All fuses in fuse box are good and have power****

  • montehammons Dec 08, 2012

    IDK, you may have all of them there under the hood. So does the key activate a relay for the fan in the fuse box there? That relay should have a terminal that is hot at all times, so pull the relay and ground a testlight and check if one of the relay terminals has battery voltage. One should have power with key off-that's your battery source- and two terminals should have power with key on the batt. and the signal from key or from computer to the relay's coil to energize the relay. Start by checking for battery power to your relays, fan and fuel pump...might still have a missing link or broken or missing wire. Try to find a complete wiring diagram. Lots of Jeep forums, some great help there.

  • montehammons Dec 08, 2012

    Donnie, is the computer powered up? any dash lights yet?

  • Donnie Parker
    Donnie Parker Dec 09, 2012

    Yea there is a relay that activates the fan when you turn the key on. He sayed there is power from the key, to the relay before the fan, and coming out of the relay. But its not making it towards the fan. I told him to get the tester, start at the relay and work his way down the wires leading to the fan. Every 2 - 3' poke the wire to see if it has power, if not in a certain place he knows it somehow broke the wire inside its casing. Hes also going to go to the Jeep dealership to see if they can give him a complete wiring diagram. Still no dash lights, ex. check engine and the rest, when he turns the key on. My last advice to him was to sell it to a junkard or a person that knows more about it.

  • montehammons Dec 09, 2012

    Yeah, a lot of jeep stuff was pretty forgettable-lol. An uncle told me the jeeps of the '60s and '70s never worked when you needed them. I always did like the 4.0 L engine, though. My son has a '95 Cherokee with the 4.0L. I read somewhere that it took Chrysler until 1996 before they finally achieved a smooth idle in the engine.

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  • Contributor
  • 12 Answers

I agree. you probably shorted a circuit in the ecu. pick up a cheap one from a junker and plug it in. at least you will eliminate that if its not the ecu but i bet it is.

Posted on Nov 29, 2012

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  • Expert
  • 344 Answers

Did you check for blowin fuses? Defective relays,

Posted on Nov 29, 2012

  • Donnie Parker
    Donnie Parker Nov 29, 2012

    All relays and fuses we have found are good

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SOURCE: 1991 Jeep Cherokee stalls, dies while running idling will restart

well i would check the tune up i have owned lots of jeeps and they needs tune ups about every 30,000 miles plugs wires cap rotor take a look at them and go from there

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SOURCE: 1999 Jeep Grand Cherokee Died while driving home

check the fuel pump fuse/relay, could be just bad enough to cause an intermittent start/no start. and check fuel pressure,spark and the crank position sensor.

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  • 1 Answer

SOURCE: 90 jeep starting problem

Check the crank position sensor. I had the same problem in a 1989 cherokee 4.0, and the solution was simply to acomodate the sensor wiring. No replace was necesary

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SOURCE: 2000 Jeep Grand cherokee Laredo

sounds alot the the pcm it controls the fuel pump and ign system but the anti theft would keep it from starting because the key has a transponder in it programmed for that vehicle and that would kill all ign if triggered

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SOURCE: 1994 jeep wrangler 6 cyl 5 spd no start

have u ck out the ignition switch [not the key & tumblers],, or the neutral safety switch to see if u have power ,,also seen broken wire at solenoid on starter too,,hope it helped,,

Posted on Apr 05, 2010

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