Sorry system crashed before my complete post was downloaded
I have a 97 TJ... with the above mentioned error codes according to the odomiter error code reading method.
Other problems came about at same time. A tick tick tick tick.. metal to metal that makes me nervouse as shit... but it dissapears and when it does my speedo drops to zero and performance goes up above normal.... weireeeedddd
Other related... or not? issues.. Cracked Exhaust manifold like thousands of others. Speedo been givng me fits for a while. Reading info seems to say its a short problem and not big issue.
Also, I am assuiming a Cat converter going out.... at times it feels like someone threw out a huge as anchor.... for a few seconds. From reading I determined its back pressure from a clogged Cat.. (some crap blocked the exhaust for a secod or two) and that as the crap all finally blows out its will be fine till I have to get an emissions test.
FIX YOUR CAT!!! That huge anchor is indeed your cat, and mine just gave out a week and a half ago, but I was on the freeway with no choice but a tow truck. Not fun.
The PCM is basiaclly the "computer" that controls everything. All that error code 12 means is that sometime in the last 50 times you have started your Jeep you have disconnected the battery, which led to your PCM not having power at that time till you connected you battery back up again. If you are having problems with your MAP sensor just go down to the local auto parts store and by a new sensor and plug it it and see if that gets rid of that error code. While you are down there buy an extra TPS so if the one you have goes out on the trail you can just plug in your new one. Your Jeep will still run with a bad TPS, but it will just run poorly.
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