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99 PCM replace/update

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Old 06-15-2019 | 04:58 PM
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Originally Posted by Dave51
It showed it was working at the moment it was being tested.

Were diagnostics being monitored at the moment a CEL appeared?
Yes, so every time you clear the code, it returns every second start of the vehicle without fail.
This happens no matter how the code is cleared.
Last edited by 4x4jeepmanthing; 06-15-2019 at 05:01 PM.
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Old 06-15-2019 | 04:59 PM
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Originally Posted by Dave51
BTW, did you try the Old Wives Tale adaptive memory reset with the headlights thing?
Yes, many times.

And I too searched a few part stores for this pcm, nothing under 300$, only one had a matching number.
Last edited by 4x4jeepmanthing; 06-15-2019 at 05:09 PM.
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Old 06-15-2019 | 05:20 PM
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[QUOTE=4x4jeepmanthing;3560804]
Originally Posted by 97grand4.0
Also I've heard the computer numbers have to match, how is this accomplished buying a pcm from az or such?
by Part Num..printed on PCM tag and in Ebay adverts...will be 56041 in small case (for my year) and XXX digits much bigger.
To my knowledge, the last 3 digits represent a software update

Cardone list compatible Part nums.


Originally Posted by 97grand4.0
Yeah Hantek seems to be the only alternative to Pico, and is about 5x less expensive Chinese? version. No opinion, have never used either, which you also have to have a laptop to use either one so there's another expense. But I would entertain buying one just to see.
Yes Chinese, very cheap, I had another look online last night..pretty steep learning curve, Chinglish Instructions, No support
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Old 06-15-2019 | 06:34 PM
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Originally Posted by 4x4jeepmanthing
Yes, many times.

And I too searched a few part stores for this pcm, nothing under 300$, only one had a matching number.
Try these guys:

https://www.fs1inc.com/1996-jeep-che...rogrammed.html
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Old 06-15-2019 | 10:37 PM
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Originally Posted by Dave51
Does it matter that it says it's for a 1996?
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Old 06-15-2019 | 11:26 PM
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Originally Posted by 4x4jeepmanthing
Does it matter that it says it's for a 1996?
Almost certainly Yes

'96 and post 96 have an different method of communicating with the TCM

Once you have the part num of your PCM, their is heaps on USA Ebay..just search the part num

So here is an example off Oz Ebay...(for a 2000 PCM)...shows the 56041 small and 673AF..all those nums make up the correct part num

* note...shows key and ignition lock included...post '96 have immobilsers..I think PCM recognises unique code from igintion
...could be wrong about that, but they start for 3 secs then stall

https://www.ebay.com.au/itm/2000-01-...QAAOSwRYNccM6u
Last edited by awg; 06-15-2019 at 11:42 PM.
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Old 06-16-2019 | 04:36 AM
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Originally Posted by 4x4jeepmanthing
Does it matter that it says it's for a 1996?
Oh scungilli! I looked to the side and read read awg's year. Well that's NFG!
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Old 06-16-2019 | 04:41 AM
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What's your PN#?

https://www.fs1inc.com/jeep-ecu-ecm-...l=176&year=132
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Old 06-16-2019 | 08:17 AM
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Originally Posted by Dave51
P56041492AD so far az/ eBay is the only match I've found. Hopefully I can find one from the JY for cheaper so i can confirm this issue finally.
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Old 06-16-2019 | 08:27 AM
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https://www.fs1inc.com/engine-comput...m-pcm-oem.html

Hey, but if it's running fine, get the black electrical tape.
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Old 06-16-2019 | 10:12 AM
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BTW did you change out the crank/cam sensors back then? Why were they changed?
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Old 06-16-2019 | 01:37 PM
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Originally Posted by Dave51
BTW did you change out the crank/cam sensors back then? Why were they changed?
Ckp was dying driving, cmps in hope of fixing code.
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Old 06-16-2019 | 02:18 PM
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Ohhhhhh, you got a

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Old 06-16-2019 | 02:36 PM
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Check the distributor indexing and if the distributor shaft is loose.
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Old 06-16-2019 | 06:01 PM
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Originally Posted by Dave51
Check the distributor indexing and if the distributor shaft is loose.
I have done so 5 times and even replaced the distributor in case the gear was worn.FSM followed, nothing changed.
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