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Old 09-07-2012, 12:04 PM   #1
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'99 PCM issues

I'm doing some work for a friend on her '99 Sport, 4.0, auto, w/o SKIM module. It gives a P1686 code which is a SKIM error. The jeep was having issues which I believe I traced to a crank position sensor which shorted to the exhaust manifold. It would run intermitantly than finally quit altogether. In this stage it would accasionally give a "No Bus" display in the odometer window. Since I replaced the crank sensor with new it will only run about 2-3 seconds then quit and then the P1686 code can be detected, (No "Check Engine" light is displayed). By looking at the schematics the only things that I can see that have anything to do with a possible SKIM error are input from the SKIM module, (which this vehicle doesn't have), the clock spring, (which is only about 3 months old and no other typical clock spring problems), and the data connection. I'm guessing that the PCM was corrupted by the shorting and that a new, reprogramed PCM would resolve the issue. My concern is that some of the exchange sources have less than good reviews and I don't want to hang out $300 without being able to recover at least most of it. I also got some input from another Jeep shop that ANY problem referring to SKIM issues needs to go to a dealer. Any thoughts?

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Old 09-08-2012, 07:35 AM   #2
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btt

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Old 09-19-2012, 07:19 AM   #3
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Update

After careful consideration I decided it had to be the PCM. Went ahead and bought reconditioned unit from Car Computer Exchange and it took care of the problem. I had read a number of reviews about places that offered reman computers and lack of support, but in response to that I understand that putting a precision device in the hands of someone of questionable knowledge certainly can lead to issues. It was a chance to blow $300 but it worked out and I'd do it again, but only after doing whatever I could to confirm it was necessary. I'm sure through a dealer this could have been a $1000 reapair.-TB
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Old 09-19-2012, 09:02 AM   #4
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Quote:
Originally Posted by biggie View Post
After careful consideration I decided it had to be the PCM. Went ahead and bought reconditioned unit from Car Computer Exchange and it took care of the problem. I had read a number of reviews about places that offered reman computers and lack of support, but in response to that I understand that putting a precision device in the hands of someone of questionable knowledge certainly can lead to issues. It was a chance to blow $300 but it worked out and I'd do it again, but only after doing whatever I could to confirm it was necessary. I'm sure through a dealer this could have been a $1000 reapair.-TB
Even though no one posted to ur thread thanks for responding back with how u fixed the issue,

I use the search button allot and it sucks seeing the same issues I'm experiencing and then the person fixes it and never posts how it was resolved lol
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