1996 Jeep Grand Cherokee Logo
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wendy rodewald Posted on Mar 20, 2014
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Immobilizer light stays on engine won't start

When turn ignition to art engine cranks over but wont run immobilizer light goes on then off then stays on.

1 Answer

allobd2

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  • Jeep Master 1,207 Answers
  • Posted on Mar 20, 2014
allobd2
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Make sure the key isn't on a keyring, and if you have a spare key try holding it against the ignition barrel whilst trying to start the car. Failing that, it's an auto electrician job. China OBD2 car diagnostic tools wholesale on CareUCar

5 Related Answers

simidrm45844

  • 159 Answers
  • Posted on Sep 27, 2009

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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Anonymous

  • 1326 Answers
  • Posted on Oct 09, 2009

SOURCE: when turn ignition on engine

How about we start with scanning the engine codes? That will direct you to the specific reason the engine light is on and save you a lot of time and energy chasing your tail with potentially wrong leads elsewhere.. The check engine light only flashes on when a sensor has been detected out of range or malfunctioning. The PCV valve would not constitute as a sensor and would not flag the ECU.

Anonymous

  • 166 Answers
  • Posted on Nov 19, 2009

SOURCE: Hard starting when cold ( engine cranks normally )

see if your engine has a ECT sensor (temp sensor that delivers information to your ECM) they are installed on the intake side of the cylinder head, it usually has 2 cables, have it checked replace if necesary

Anonymous

  • 2 Answers
  • Posted on May 03, 2010

SOURCE: 91 jeep yj wont start

It is your ignition module. Drivers side behind the washer fluid bottle on your firewall. It is about 6'' x6'' and has 2 plug ins.

Anonymous

  • 6982 Answers
  • Posted on May 31, 2010

SOURCE: Jeep wont start, engine goes to turn over but wont go all the way

Ok...what you need to determine next is if the fuel pump is operating. Turn the key to the on position and have someone listen at the tank. If you can't hear it, it's not on. (that can be pump relay, pump or sometimes asd relay) to quick check relays see if you can feel each click when the key is turned on. If you can get the pump to run by banging on the tank bottom go no further and replace the pump. Most relays are the exact same and can be interchanged as well (except abs relay)
If the pump is coming on the next item to check is the crank position sensor. You will need a digital multi-meter and a manual for the test, but if you shoot some carb cleaner into the intake and the engine starts (do while cranking) likely it is OK and then back to the pump or get a chiltons manual and a meter and do complete testing. Battery needs to be fully charged or any tests are invalid.

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run the fault codes as some engine lights only light up for urgent problems that require you to stop the engine
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Sounds like the immobilizer system is preventing you starting it. This usually requires a main dealer to fix.
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What about with the key in the on position -do the warning lights and gauges turn on? That would mean the ignition switch has power and can turn on.
Any theft alarm activated, immobilizing the car?
Won't turn over- you mean won't start or the starter won't spin the engine over? If it won't start, ignition spark or fuel problem. If the engine won't crank, problem is in the start circuit- from battery to starter, and from battery to ignition switch to starter. Park/neutral safety switch is in circuit between key switch and starter.
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Isince it cranks, means you have power, elctric system is ok! I guess.. this could be a result of gas delivery problem... either a pump or gas circuit controller.... OR a small propable reason if you have an immobilizer (electronic chip on key!)... but there should be the securit key highlithed on dashboard...
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Can you help me, anti-yhief cut power to engine and it won-t start back up

Do you have the year make and model.? If it is a anti theift with a key immobilizer the vehicle will just start and idle for a few seconds then shut off and the anti theft light will remain on or be blinking. Then we know you are dealing with the anti theft. do you have another key to crank the engine if you do use a spare key and hold the key next to the immobilizer and crank the engine see if that will give if it doesnt try this method. roll the window down with window down disconnect the negative battery cable wait 5 minutes reconnect put the key in the ignition but dont crank it just yet turn it in the on spot not the crank for 2 minutes then crank it and see if that start the vehicle . If this doesnt work then you will need to call a mobile locksmith who reprograms the immobilizer
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I have a 2001 honda civic that wont start it turns over but wont fire, no check engine light, no codes, fuel pump working, battery is good all power works. it has no fuel or fire when trying to turn over. ...

If it were the immobilizer, you would have a security light that would be flashing or staying on all the time the key is in on. Since the engine cranks over and the pump is working when you turn the key to on and start, the green light may just mean the bulb is burnt out or a connection problem with that wire for the light. Not much of a problem there.
You said no fuel or fire when trying to start-so that is where to concentrate: you first need to verify that the ignition still is working, so check for spark on a plug wire with the engine cranking over. This could be a main fuse or main relay not passing power on to the ignition system and/or the injector circuit. First check for spark, and if you have spark, check the injector circuit (there is a fuse for the injectors-probably under the hood in a fuse/relay block). If you have no spark, you will have to diagnose the ignition system- coils, ignition control module (the ignitor), the crank angle or crank position sensor, finally the engine computer.
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Many cars these days are equipped with an immobilizer. (you can find more information about the immobilizer in your owner's manual). The immobilizer allows the engine to run only if the correct key is used. If your car has an immobilizer, you probable see a "Security" or Key-shaped light coming on on the dashboard every time you turn the ignition ON. If this light is flashing when you turn the ignition ON, it could mean that there is some problem with an immobilizer or the system does not recognize the key. If the immobilizer doesn't recognize the key, the engine wold not start at all, or would start and then die in few seconds.
You can try a spare key, if it won't work, your dealer is the place to call. Sometimes, the key is just need to be reprogrammed. On some cars you can find the information how to reprogram the key in the owner's manual.

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