YJ Trouble Codes - JeepForum.com

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post #1 of 23 Old 09-06-2010, 06:32 AM Thread Starter
tejasjeepgirl
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YJ Trouble Codes

How do you manually rest the trouble codes on a YJ Wrangler? I have a code on it and have done a few adjustments. Now I want to reset to see if it's fixed now. All the shops around here want to charge $100 just to hook it up to a machine. The local AutoZone's (who normally does it for free) machine only does 96 and above and I have a 1995 YJ Wrangler.

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post #2 of 23 Old 09-06-2010, 06:58 AM
Alfons
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Originally, diagnostic computers for OBD1 systems were only found in garages etc. When OBD2 came in around '96, OBD1 code readers were ignored & it's been only recently that you could get OBD1 & 2 code readers/diagnostic tools (that's why Autozone tests '96 and up, they don't have an OBD1 capability). If you're only planning on using the OBD1 element for reading diagnostic codes, you can use the your ignition key and count the CEL flashes to see what the computer thinks is wrong - you can reset this by disconnecting the battery.
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post #3 of 23 Old 09-06-2010, 07:10 AM
Mark05059
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disconnect the positive battery terminal and touch it to the negative terminal for a few seconds. Then reinstall the positive cable. You will (most) always get 12 33 and 55 for codes however.

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post #4 of 23 Old 09-06-2010, 07:15 AM
rustywrangler
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You don't even have to touch the cables together. Just disco the pos batt cable for 10 seconds and the codes will clear. If you don't have AC, you will always get 33. And after disconnecting the batt you will get code 12, that is normal it will go away on its own. 55 is the end of the scan.


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post #5 of 23 Old 09-06-2010, 09:05 AM Thread Starter
tejasjeepgirl
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Thanks

Thanks so much for this help! I really want to learn how to do some routine stuff myself.
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post #6 of 23 Old 09-06-2010, 09:15 AM
Mean Max
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You got 3 responses but yet you still weren't advised on how to read the codes yourself, or how to look up the codes........tsk, tsk, tsk.............not the JeepForum kind of answers I'm accustomed to seeing.

Here ya go.

http://www.jeepforum.com/forum/f12/f...54/#post682627

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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

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post #7 of 23 Old 09-06-2010, 09:39 AM
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Quote:
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tsk, tsk, tsk.............not the JeepForum kind of answers I'm accustomed to seeing.
Quiet you, some of us hadn't had our coffee yet. I just came in here to add that link but you had to open your big mouth.


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post #8 of 23 Old 09-06-2010, 09:42 AM
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Quote:
Originally Posted by rustywrangler View Post
Quiet you, some of us hadn't had our coffee yet. I just came in here to add that link but you had to open your big mouth.
Heh heh! My big mouth was already full of coffee there slow-poke!

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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

There is no situation that cannot be improved with a small but well-placed explosive.
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post #9 of 23 Old 09-06-2010, 02:35 PM
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I get a code 33 and have no AC. What's with that?
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post #10 of 23 Old 09-06-2010, 02:47 PM
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Quote:
Originally Posted by LordEnki View Post
I get a code 33 and have no AC. What's with that?
you didnt read rustywranglers post about always getting code 33 if you dont have ac.

1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
|---L--[]lllllll[]-
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post #11 of 23 Old 09-06-2010, 03:01 PM
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I did read it. Just thought there would be more to it than "you'll always have a code 33". Lol
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post #12 of 23 Old 09-06-2010, 04:18 PM
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Nothing more to it, code 33 means you dont have A/C... So you are good to go. You should get code 12, 33, and 55 in your case.

12 = battery disconnected within last ~12 starts.
33 = no ac
55 = end of code output
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post #13 of 23 Old 09-06-2010, 04:56 PM
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I am getting codes 12, 22, 55 on my 91 YJ. I have disconnected the battery but the check engine light will not go out. I have changed the temp sensor but the light is still on.

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post #14 of 23 Old 09-06-2010, 05:01 PM
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Quote:
Originally Posted by larry408 View Post
I am getting codes 12, 22, 55 on my 91 YJ. I have disconnected the battery but the check engine light will not go out. I have changed the temp sensor but the light is still on.
It sounds like your codes are not "clearing" from the ECU's memory. As stated by Rusty, merely disconnecting the battery should clear the codes.

However, if they fail to clear there is another way to attempt clearing them. Disconnect BOTH battery cables from the battery. While they are NOT hooked up to ANY battery post, touch the 2 cables together for a few seconds. This will discharge the capacitors in the ECU that store "hard" codes.

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Quote:
Originally Posted by UltimatE View Post
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Quote:
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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

There is no situation that cannot be improved with a small but well-placed explosive.
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post #15 of 23 Old 09-06-2010, 05:05 PM
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Quote:
Originally Posted by rustywrangler View Post
You don't even have to touch the cables together. Just disco the pos batt cable for 10 seconds and the codes will clear. If you don't have AC, you will always get 33. And after disconnecting the batt you will get code 12, that is normal it will go away on its own. 55 is the end of the scan.
How do you know that Rusty? I have seen it posted that you have to disconnect the battery for thirty minutes, for 30 seconds and that you have to touch the cables together...in different posts of course...but I'm just wondering how to determine who is right. I'd always go with what you say first, but was hoping you could post some response for future searches...I mean, now that you've obviously had some coffee, lol.

First Jeep was an 1989 YJ, 6 cylinder 4.2L , 258. Nuttered and TeamRushed, Weber 38 DGES, Now, I'm venturing into the world of Grand Cherokees
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