Question about 1996 Jeep Grand Cherokee

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1996 jeep cherokee limited. Turned it off, next morning it wouldn't start. Took to a garage, and the computer wouldnt allow them to get in. Not firing, no fueling. Am I looking at having to buy a new computer? Is this a relay? I don't want to spend alot more money on it.

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More computers are replaced every day than are necessary. That said, they can fail.
Your shop needs to do testing beginning at the harness connections on the computer. pins need to be tested to make sure that there is both power and ground present at the appropriate pins. All fuses need to be tested as well as the ignition switch and connections under the power distribution center. Generally, relays are controlled by the computer, not the other way around. Grounding is important....there are two major ground points and about four more smaller ones that all need to be clean and secure.
The computer itself is very accessible and takes ten minutes to replace. there are many available in wrecks. As they do not have a high failure rate, it's a good bet that one you get that way is good, providing that during the accident, the electrical system was not compromised causing shorting. (best units come from vehicles that had mechanical problems)
If you are dealing with a good reliable shop, they will know what to do.

Posted on May 28, 2010

  • kritz444 Jun 04, 2010

    I took it to a jeep dealer, and they found it was the cam sensor needing to be replaced.

  • Richard Scordino Jun 04, 2010

    A bad cam sensor will not prevent the computer from communicating with the scanner. Your original problem coupled with the problem the first shop had (having no communication) are more consistent with a "no bus" condition. Your original problem though, without the other shop involved, is also consistent with either a cam or crank sensor failure. (very common)
    "No bus" can be elusive as it can come and go, usually caused by anything from a bad ignition switch, poor connection in the harness, or even a broken contact inside the computer.
    In all my posts, I always stress the importance of testing before buying parts. I hope the dealers solution is correct and that your Jeep continues running well!!!
    Good luck!!

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I replaced my crank shaft sensor on the bell housing,started up,1995 4.0 $80.00 diy

Posted on Jun 05, 2010

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Posted on Jan 02, 2017

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