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Unread 03-23-2015, 01:46 PM   #1
uncletiffy
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Computer failure.

What are the signs of a computer failure?

I s it sudden or something that happens over time?

95 2.5.

Thanks.

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Unread 03-23-2015, 01:55 PM   #2
Mobile_Homie
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Does the "check engine" light come on when you turn the key to the "on" position?
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Unread 03-23-2015, 01:59 PM   #3
uncletiffy
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Comes on and stays on.
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Unread 03-23-2015, 02:02 PM   #4
unkajeffy
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http://www.jeepforum.com/forum/f12/c...rs-ecu-492597/

Check this thread.
But if the CEL is staying on then you probably need to pull the codes.
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Unread 03-23-2015, 02:07 PM   #5
mike134
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follow this video to retrieve the codes: http://www.youtube.com/watch?v=KTZAJSHtBkk

It is unlikely that your computer is bad if the CEL comes on.

To answer your other question, it can happen gradually or suddenly. Sometimes it will happen with an extreme change in whether.
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Unread 03-23-2015, 03:38 PM   #6
1320yj
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Plug in a real scanner and see what codes there are. If the scanner says it cant communicate with the vehicle the computer is bad.
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Unread 03-23-2015, 04:26 PM   #7
Que89YJ
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The mil light will stay on if you have a hard fault. check your codes.
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Unread 03-23-2015, 09:04 PM   #8
dzywicki
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I also have a 95 2.5. When mine was failing, it was just like int he link. I would turn the key on, wait for 30 seconds to a minute, hear a really loud metallic clicking. Thne, I could start normally. I sent my ECU off to get rebuilt (don't remember where). That was ~1o years ago. Haven't had a problem since.
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Unread 03-24-2015, 06:27 AM   #9
uncletiffy
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Thanks.

Should I do a re-set then read the codes?

I have done so much to the engine recently.

New map sensor, timing chain and gears..........
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Unread 03-24-2015, 06:51 AM   #10
boduke5051
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No, you need to read the codes first. Otherwise, you'll lose them when you do the reset.
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Unread 03-24-2015, 06:56 AM   #11
ShadowSentry
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I'm curious, is there a reason you think the computer is failing or is it just you being curious as to what the signs would be?
My computer failure was sudden, turned off jeep, cam out to start it five minutes later and the computer failed. when it stopped working properly it still showed the normal codes:
12 - battery disconnected
33 -no A/C relay
55 - end of code
In the end some internal part that powers the ground to the ASD and fuel pump relay fried. only signs were that the jeep wouldn't start because the ASD relay wouldn't ground, and no fuel pump priming.
I had replace the computer with an ECM from a neglected and wrecked jeep in Wyoming and put it in with no reset and it ran like crap. after resetting it, it runs much better and smoother now and the was in December.

Computer reset info REF:
http://www.jeepforum.com/forum/f67/r...emory-1265118/
http://www.jeepforum.com/forum/f12/ecu-failure-351573/
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Unread 03-24-2015, 07:09 AM   #12
uncletiffy
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Actually, I read the codes, and 2 of them was MAP sensor electric and vacuum .
But there was also a few others some of which did not make sense.
So I am thinking, now that I have replaced the MAP and timing chain and gears to do a reset and see what it has to say.

The reason that I think the comp may be failing is that I keep getting different readings every time that I read it.
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Unread 03-24-2015, 07:51 AM   #13
Que89YJ
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Post the faults you have. The map sensor fault almost always happens with a TPS fault. tell us what you have so we can help.
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Unread 03-24-2015, 08:00 AM   #14
uncletiffy
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Tps ?
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Unread 03-24-2015, 08:14 AM   #15
Que89YJ
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Throttle position sensor
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