Question about 1996 Jeep Grand Cherokee

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I have 96 Grand Cherokee 5.2 v8 its getting no spark no power to coil have checked relays and fuses Gauges not working ive replced Crank sensor have done all checks everyone says still wont start Fuel pump doesnt cycle either Need help am really frustrated

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  • turbolx1 Nov 13, 2010

    ive checked power coming in and out of ign switch and its working it turns and when try to reads codes it comes up err ive checked all fuses and switched relays around also unpluged new crank sensor and gauges still do nothing and still wont start

  • turbolx1 Nov 14, 2010

    any Help on what color wires on it should be hot ive have power coming in then i have power when key turns on and when key is turned to start i have no power at the coil but if i take the auto shut down relay out and put a jumper wire in from the hot to the wire feeding coil i have power at coil trying to see if its the pcm or what

  • turbolx1 Nov 16, 2010

    its not just the fuel pump not working The voltage gauge doesnt work either and i have no power to the coil when key is on it will turn over ive switched relays around ive unpluged crank sensor no change in gauges ive put in a new crank sensor still wont start ive taken fuel pump relay out and used a jumper wire and i can make fuel pump turn on so i took out the auto shut down relay and jumped across that and will have power at coil but wont start so i decided to check to see if the ground on each relay was good so i used a test light to check grond and nothing so what ever it is it must be breaking the ground for everything so it wont work someone said its the antitheft system causing it and that there was a black plug in the driver side kick panel that you find and hook a wire to the purple and yellow wire coming out of it and ground it and it would release the antitheft part i didnt find anyplug in the kick panel but i found one under the dash that had that color wire and tryed it nothing happened im about ready to tell the owner i cant fix it when we hook up scanner it just comes up err ive checked all fuses and there all good

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I want to say to simply try a new Ignition switch and to reset your Inertia switch for the fuel pump. The gauge for the fuel level would be about the only gauge which will work when you turn the Key. Your water temp, oil pressure, and Amp gauge need to have the engine running to show something and your engine is not running.

The fuel pump should cycle. The coil should have spark. The engine cranks. You know you are getting power to the Starter side of the Ignition switch. You don't know if you are getting power to the Run side of the Ignition switch. You should be getting spark to the coil when you crank from the Starter side of the Ignition switch and you say you are not.

I have heard of the Antitheft devices interrupting the spark or the starter relay to prevent theft. I have not heard of one which disables a fuel gauge and prevents the fuel pump from priming the system. I think your best bet is to get your fuel gauge working and the fuel pump to cycle.
This is why I suggest the most basic thing, the Ignition switch and its harness.

Perhaps if you change the Ignition switch you will find corrosion or a bad pin connector. I see no one has attempted to help you for 2 days and I guess they are stumped. You can use the reply feature and keep me advised.

Posted on Nov 15, 2010

  • fordexpert Nov 16, 2010

    Sorry, didn't see your update when I first posted my answer. Are you in Service Yet? Can you trace your power wire from the Ignition side of the switch to the first connector from the Steering Column? You have to be losing power to the gauges and the Inertia switch somewhere. If you have power TO the Ignition switch and FROM the RUN side of the Ignition switch the fuel gauge should operate.

    Have you unplugged the fuel pump and checked the wires going to it? The Inertia switch can prevent the power connection until it is reset, but nothing should prevent the fuel gauge from completing the loop to work. If the fuel gauge wire is dead at the tank, your problem is limited to the gauge wire or a connector under the dash. I will try to find a wiring diagram.

  • fordexpert Nov 16, 2010

    Check out About.com for this Year and model. There is a really good diagram and test procedures for the Auto Shutdown Relay. It covers the Ohm readings per terminal with and without power. There was also a mention about the Green 30 Amp fuse which can blow IF the fuel pressure is low. Since you can get the pump to run-Why not jump it and take a pressure reading at the fuel rail?

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  • Expert
  • 64 Answers

You need either a new ignition switch or your main fuse is blown.

Posted on Nov 13, 2010

  • james sasser
    james sasser Nov 13, 2010

    you can still have a bad ign switch. you can have power through it but not at the correct one.

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