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Unread 06-18-2013, 09:20 PM   #1
therealmouch
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1993 XJ Cherokee 
 
Join Date: Jun 2013
Location: Edmonton, Alberta
Posts: 4
Check Engine Codes 12 52 55

I have a 93 Laredo, one day home from work it statred to stall as i came to a stop. so i got to a parking lot. then i drove it to my guys house. i had to feather the gas while i applied the break to keep from staling. in gear it would stall but in park it would idle ok. so he cleaned my censors like the tps, not really sure what else as i am not very mechaniclly inclined. but it was kinda fixed. it ran a bit rough but driveable until he figured out what was up. so the other day the check engine light came on, the codes were 12 52 55. i have read some threads but not really sure how to attack this. a point in the right direction would be great.

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Unread 06-18-2013, 09:25 PM   #2
dnuccio
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1995 ZJ 
 
Join Date: Jul 2012
Location: Phoenix, AZ
Posts: 3,474
code 12 is battery disconnect. means the battery has been disconnected within the last 50 run cycles. code 52 is logic module fault. have no clue what that one means. code 55 is end of codes, means theres no other codes stored in the computer.
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Unread 06-18-2013, 09:26 PM   #3
jm8881
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1996 ZJ 
 
Join Date: Oct 2005
Location: , California
Posts: 278
12 and 55 are normal and don't trigger the check engine light. 52 is a rich condition. This can be caused by a number of things, I don't know what specifically on your jeep but common things are: bad O2 sensor, leaking injector, failed fuel regulator, bad map sensor. You'll have to do some diagnostic work but my guess is more than likely your O2 or oxygen sensor has gone bad and is reporting incorrect information to the pcm.
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Unread 06-19-2013, 12:07 PM   #4
therealmouch
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1993 XJ Cherokee 
 
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Location: Edmonton, Alberta
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Thanks for the advise. I will post when I find the solution.
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Unread 09-09-2013, 04:46 PM   #5
therealmouch
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1993 XJ Cherokee 
 
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Location: Edmonton, Alberta
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Ok, so I replaced the O2 sensor and reset the CEL. Now it seems that it runs fine while in park. It idles fine but as soon as I put it in gear it stalls. It's been a week since I replaced the O2 sensor and the CEL has not come back on. So now I'm not sure what to do. Just keep replacing sensors or what? I was going to replace the fuel filter and start small to see if it makes any difference. Any advice would be helpful.
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Unread 09-09-2013, 05:00 PM   #6
JasonStebbins
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1997 ZJ 
 
Join Date: Jan 2009
Posts: 3,128
Clean/check IAC / Check fuel pressure / Check transmission fluid level
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Common ZJ problems and how to fix them by JasonStebbins
http://www.jeepforum.com/forum/f13/c...x-them-1432264

12 things to do when your ZJ stalls by ZeeJay1997
http://www.jeepforum.com/forum/f13/1...talls-1407423/
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Unread 11-12-2013, 11:24 PM   #7
therealmouch
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Location: Edmonton, Alberta
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Well I just recently changed my EGR and that was the culprit. Now it idles smooth and runs great.
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