2002 Jeep Grand Cherokee Logo

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Posted on Mar 07, 2017
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Sometimes vehicle (2000 jeep grand cherokee) won't start. you get nothing when you hit the key, no clicking, no nothing. you may go back later and it will start. gauges go crazy. will come on. odometer and clock will flash. sometimes speedometer will go from 60 to zero and back. will not lose power though. you can have key off and sometimes gauges will twitch. just noticed that with key off if you hit the windshield wipers that gauges will move. jeep dealership can't figure it out and neither can my mechanic. mechanic thinks its a electric problem? what about ignition? obviously there must be some juice getting to gauges with key off. also, jeep is in won't start mode now. i noticed when hitting key and trying to start i get nothing....no lights, bells, or whistles. yet if i shift jeep into neutral, car won't start, but the gauges on dash light up, and bell goes off??? i know nothing mechanical so i don't know what any of this means, but those that should know seem to be having trouble also. thank you

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  • Jeep Master 20,706 Answers
  • Posted on Mar 07, 2017
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NO CRANK it is. (this car can only start if cranked yours DONT)
x2 typical, of old cars sure.
Head lamps DIM? if yes, fix that first. HL work key off, so.....
yes, its electrical

id have to inspect it.
but the ignition key is switch is bad?
or wire to hit hacked, (as in remote start BS or alarms added or who knows, me not looking for hacks)

with key off the can be no gauge power

2000 grand in USA is a WJ jeep
But wait if the battery is weak the other computer brains can go nuts.causes a SIDE SHOW.

cluster pin 7 is dead with key off.? pin7 is run-start a21 power.feed.
if not the key switch is bad. A21 must go 0v dead , key off.

if the battery voltage is low (batteries and lugs are #1 failure on all cars) if voltage drops all the computers can go nuts, BCM PCM and others.
so voltage is #1
we check the battery first,12.6vdc or more rested.
if not its way low , bingo, (ask for help , can be 3 thing wrong)
or at the CIG jacks, we check voltage there easy.
key on, 12vdc, not 10vdc
the cluster acting up tell you power is bad or communications to it are garbled.
since it dont crank then we fix that first. (power)
1: fuses ok and not loose.
2: battery check good
3: battery lugs not green with corrosion, clean em?
nice list of checks.
http://jeepdied.com/no-crank.html

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  • Jeep Master 3,828 Answers
  • Posted on Mar 07, 2017
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Typical jeep gremlins on a 17 year old car
mechanics either replace all the computers and modules
or throw lots of unnecessary parts into it with minimal results

needs a volt meter an LED test lamp and a lot of time
tracing the wiring faults
starting at the battery through to the ECU and ignition

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1 Related Answer

Anonymous

  • 6982 Answers
  • Posted on Apr 23, 2009

SOURCE: GAUGES GO CRAZY AND SOMETIMES VEHICLE WON'T START

Poor grounding can cause many of the conditions you have listed. When checking power with a volt meter, this goes unnoticed because the meter does not draw enough amperage to cause the bad connection to break contact. Your battery is grounded to the engine block and also has a small lead to the fender. Many components have individual ground leads as well (including most computers) I would check all ground leads and clean the contact surfaces with sandpaper or a wire brush. Adding an additional ground wire is a good idea as well. Don't forget that the dash board frame must also provide a good ground as well.
Many times this is all you need to do...sometimes though, control modules can be damaged because in having a partial ground, they build up heat, due to additional resistance in the circut.
This may or may not cure your problem, but it's worth checking out. Grounding is often overlooked, especially if it has not completely broken down.

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