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Old 09-19-2013, 12:42 AM   #1
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Check Engine Light

This one puzzles me...

I accidentally kicked my spotlight toggle with my knee when I got out of my Jeep the other day. It sat in that state for somewhere in the 36 hour range. When I went to start it today, it obviously was deader than a door nail. So I proceed to jump it with my truck. It took a long time to get enough juice to start. After it started, it ran extremely rough and I could hardly keep it running. I turned it off and started it again and it ran ok but the check engine light came on and it won't turn off now. I have a 4.0 with a standard 5 speed. Thanks in advance.

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Old 09-19-2013, 01:21 AM   #2
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Originally Posted by RedSurveyor View Post
This one puzzles me...

I accidentally kicked my spotlight toggle with my knee when I got out of my Jeep the other day. It sat in that state for somewhere in the 36 hour range. When I went to start it today, it obviously was deader than a door nail. So I proceed to jump it with my truck. It took a long time to get enough juice to start. After it started, it ran extremely rough and I could hardly keep it running. I turned it off and started it again and it ran ok but the check engine light came on and it won't turn off now. I have a 4.0 with a standard 5 speed. Thanks in advance.
I've heard about people over surging their batteries from a jump start and frying electronics before. Run the engine code so we can help you a bit more.

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Old 09-19-2013, 05:38 AM   #3
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Do you know how to display the codes on your 97?
Turn ignition key on off on off on (without starting the Jeep) within 5 seconds and wait - codes will not appear immediately.

Codes for 97's are different to later models.
You will definitely get a '12' - this very common and means the Jeep has had the battery disconnected recently or a momentary loss of power.
But '12' doesn't trigger the CEL.
The last code will be '55' - this just means it's finished, so even if your 97 has no error codes, it will display '55' when it has finished checking.
The error codes display in the odometer but the CEL will also 'flash' the code - ie for '55' it will flash 5 times, pause, flash 5 times.

I have a list of 97 error codes at home which I will post if no-one else does in the meantime.

It's also likely the Jeep ran rough because of the extended power loss, the Jeeps computer was drained, lost it's memory and it had to re-learn. This is common when people reset the Jeeps computer - it can run rough for a short time before smoothing out.
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Old 09-19-2013, 07:37 AM   #4
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97 TJ error codes Part 1

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97 TJ error codes Part 2

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Old 09-19-2013, 07:26 PM   #5
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Wow. Thanks Wesboy! I will do that tonight after I get home. Appreciate the the info and the time you took to help!
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Old 09-19-2013, 07:39 PM   #6
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Originally Posted by Wesboy View Post
Do you know how to display the codes on your 97?
Turn ignition key on off on off on (without starting the Jeep) within 5 seconds and wait - codes will not appear immediately.

Codes for 97's are different to later models.
You will definitely get a '12' - this very common and means the Jeep has had the battery disconnected recently or a momentary loss of power.
But '12' doesn't trigger the CEL.
The last code will be '55' - this just means it's finished, so even if your 97 has no error codes, it will display '55' when it has finished checking.
The error codes display in the odometer but the CEL will also 'flash' the code - ie for '55' it will flash 5 times, pause, flash 5 times.

I have a list of 97 error codes at home which I will post if no-one else does in the meantime.

It's also likely the Jeep ran rough because of the extended power loss, the Jeeps computer was drained, lost it's memory and it had to re-learn. This is common when people reset the Jeeps computer - it can run rough for a short time before smoothing out.
Does that work on a 97' it didn't on my 99' but does on my 2000.
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Old 09-19-2013, 09:31 PM   #7
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So it threw a 24. Don't really know what that means or what needs to be done now. I'm thinking that maybe with with a little time, that is a self regulating problem?
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Old 09-19-2013, 09:52 PM   #8
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Does that work on a 97' it didn't on my 99' but does on my 2000.
Jeep left that part out of the ECMs on like '98 - early 2000s I believe
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Old 09-20-2013, 07:04 AM   #9
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So it threw a 24. Don't really know what that means or what needs to be done now. I'm thinking that maybe with with a little time, that is a self regulating problem?
Throttle Position Sensor (TPS).
When mine went bad, the Jeep was revving its tattas off in Neutral.
If yours isn't revving high (1200 - 1500 RPM) it may be OK and the code just needs to be cleared.

A simple reset may do the trick but may cause your Jeep to run rough briefly again.

To reset, you can just leave your spotlights on again

OR
Use the more civilized method...
1. Disconnect Positive battery lead terminal and touch it to ground for 30 seconds (Once the lead is disconnected, I attach a jumper lead and touch it the Negative on the battery)
2. Reconnect the Positive battery cable
3. Turn ignition switch on (DO NOT crank or start the engine).
4. Turn headlights on
5. Turn headlights off
6. Turn ignition key off.

This will reset the engines computer and clear any stored codes (except 12, because you just disconnected the battery)
Jeep may run rough for a minute or two until it relearns itself but will soon smooth itself out.
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Old 09-20-2013, 08:55 AM   #10
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Thanks! Will do it right after work tonight. Again much appreciated!
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Old 09-20-2013, 07:36 PM   #11
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Well that got rid of the codes but now my clutch doesn't work. Can that be related?
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Old 09-20-2013, 09:53 PM   #12
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I can't see how it would be related but the clutch is a mystery to me (mine's an auto).
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Old 09-20-2013, 10:13 PM   #13
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I know. It is strange to me too but it started immediately after I hooked the battery back up. ???? I'll look at it more tomorrow.

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