96-98 PCM repair procedure W/Pictures - Page 8 - JeepForum.com

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post #106 of 208 Old 07-26-2013, 03:38 PM
MeanGreenZJ
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Thought this would be a good addition to this post.



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post #107 of 208 Old 07-30-2013, 09:16 PM
neonhomer
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I'm in the middle of fighting a PCM issue with my 96 ZJ... Will start fine... passes the wiggle test, and you can drive it. Sometimes it will run fine, and then when you get down the road, it will just shut off on you. No CEL... just *blah*. If you try to restart, it won't. Turn the key off, wait a few seconds, and try to restart, and most of the time it will fire back up and keep running... sometimes for a while, and sometimes it will die in a few minutes. Then there are times it won't restart at all. Gets fuel... no fire.... Computer doesn't report a loss of CKP or CMP, so I suspect the PCM.

Only code i get is a P0351. Replaced the coil. CKP and CMP are good. It's pointing to a bad PCM. So either I have to find a PCM in the junkyard from a running wreck, or shell out $650+ for a new PCM from Jeep. I'm a bit leery of the A1Cardone repops.

Looks like I am going to pull my PCM this weekend and pop it open. Have to make sure I take my tune off of it first....

But now I've seen the Regulator board issue, and the three main harness issue.... More to check....

---------------
NeonHomer
Mid-Florida Jeep Club - Member
1996 Jeep Grand Cherokee, 4.0L/42RE/242 - Rebuilt motor w/ Comp cam (4/12), 3.5" Junkyard F>R lift, 31x10.5.x15 M/T's, Spartan Locked D44a, TC & tank skids, F&R adj trackbars, V8 steering arms
Galaxy DX99V CB, 102" SS Whip, Yaesu FT-2900R 2m, Larsen 1/4w mag mount, Sony HU, Massive 3way - F Door, Pioneer 3way - R Doors, MB Quart ONX304 Subs (x2), Lanzar 1600w amp.

"No Matter Where You Go... There You Are."
"Oh me oh my a lovely day is dawning. Oh what a joy I didn't wake up dead. So I can go to work and then resume my yawning, and get my sleep on site instead of in my bed" - Daria Morgendorffer (with my twist)
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post #108 of 208 Old 07-30-2013, 09:33 PM
Bloodbath
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That's how mine was but got progressively worse. I changed out my electrolytic caps, added solder to all the connector solder joints and reflowed a couple other components. Almost 2 weeks and still working perfectly. Wish I did this about a year ago when it first started stalling.

Sucked always having the thought in my head of "where am I going to pull over if it stall right now?". I've had that thought so long that it's going to take a while for me to trust the Jeep again but all is looking good so far.

-Bill
--------------------------------------------------------------------
1998 Red Grand Cherokee Laredo
6" Lift - 32 x 11.5 BFG MT's - K&N FIPK - MSD Ignition with Magnecore wires - JKS Control Arms, Trackbars and QD's - Addco Front Swaybar - Intake Swap - U-turn Steering Conversion
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post #109 of 208 Old 07-30-2013, 09:38 PM
ZeeJay1997
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Quote:
Originally Posted by Bloodbath View Post
I've had that thought so long that it's going to take a while for me to trust the Jeep again but all is looking good so far.
yes, I know the feeling. i still have pause before crossing two lanes of oncoming traffic at an uncontrolled intersection... and mine hasnt stalled in for over a year now.. *looking for some wood to knock on*


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post #110 of 208 Old 07-31-2013, 10:20 AM
neonhomer
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Quote:
Originally Posted by ZeeJay1997 View Post
*looking for some wood to knock on*
I always knock on my head

---------------
NeonHomer
Mid-Florida Jeep Club - Member
1996 Jeep Grand Cherokee, 4.0L/42RE/242 - Rebuilt motor w/ Comp cam (4/12), 3.5" Junkyard F>R lift, 31x10.5.x15 M/T's, Spartan Locked D44a, TC & tank skids, F&R adj trackbars, V8 steering arms
Galaxy DX99V CB, 102" SS Whip, Yaesu FT-2900R 2m, Larsen 1/4w mag mount, Sony HU, Massive 3way - F Door, Pioneer 3way - R Doors, MB Quart ONX304 Subs (x2), Lanzar 1600w amp.

"No Matter Where You Go... There You Are."
"Oh me oh my a lovely day is dawning. Oh what a joy I didn't wake up dead. So I can go to work and then resume my yawning, and get my sleep on site instead of in my bed" - Daria Morgendorffer (with my twist)
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post #111 of 208 Old 08-29-2013, 04:56 PM
titaniumriders
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ramanned pcms with lifetime warranty

Hey everybody

First off...damn. thanks! Wish I'd have known this a week ago.

My moms 96 pcm just took a ****.

Garage wanted $570 new 1yr warranty, $350 used 1 yr warranty



I came a cross a company who sells remanufactured pcms calibrated, flashed and tested with a lifetime warranty ( once they receive your core via prepaid ups label) for $169.
I saw on eBay and called direct...they said it was $220 till I mentioned eBay.


All in all a great deal if you don't enjoy that potting goo... ( which makes me wo der replace it with shoe goo? Amazing **** for $4)




Anyway here the eBay link
http://www.ebay.com/itm/120911292246...84.m1423.l2649


Their info is
All computer resouces Inc
12415 sw 136th Ave
Miami FL 33186
1866 699 5230


I am in no way affiliated with them, I just thought it was good info to share
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post #112 of 208 Old 08-29-2013, 07:19 PM
ZeeJay1997
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Quote:
Originally Posted by titaniumriders View Post
Click the link


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post #113 of 208 Old 08-29-2013, 09:27 PM
coralman
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Dang, they've come up a notch or two.

Info on projects and repairs categorized by system

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Originally Posted by HighLonesome
lol...if life is as a simple as a 5.9 making you happy, I'd say go ahead and buy it on impulse. ZJs are the way of Zen. Wax on, wax off
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post #114 of 208 Old 09-10-2013, 11:09 AM
dr hook
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My 96 was built in 10/95, and the ECM looks different than the one in the OP. It looks like the one pictured here. Does anyone know if the procedure is the same for this different style of ECM?
Attached Images
 

Lifted ZJ with stuff.
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post #115 of 208 Old 09-10-2013, 06:44 PM
ZeeJay1997
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i've seen another one like it, but it was in an overseas model.

IDK what's in there.


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post #116 of 208 Old 09-10-2013, 07:04 PM
dr hook
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Just my luck lol. I guess we will find out here shortly!

Lifted ZJ with stuff.
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post #117 of 208 Old 09-25-2013, 06:50 PM
gensysmike
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http://www.jeepforum.com/forum/f13/pcm-1619121/

I just followed this repair...the above link is my results.
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post #118 of 208 Old 11-14-2013, 10:44 AM
NissanGuy23
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What exactly does it mean to 're-flow' the back of the board? Like hit it with a heat gun, or melt the contacts with a iron? Put it in an oven?
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post #119 of 208 Old 11-14-2013, 11:02 AM Thread Starter
JS97ZJ
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Quote:
Originally Posted by NissanGuy23 View Post
What exactly does it mean to 're-flow' the back of the board? Like hit it with a heat gun, or melt the contacts with a iron? Put it in an oven?
Re-solder the pins on the back of the board. Take care not to over heat the pins or it will melt the connector housing causing the pins to misalign.
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post #120 of 208 Old 11-14-2013, 04:45 PM
NissanGuy23
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Does anyone offer or willing to do a "repair service", like i send them my PCM and they remove the board, re-solder and send back? I would be def willing to pay for it. My options are buy all the equipment, torch, kit, learn to solder, go to junkyard / buy a re man unit, spend $250 for a new one, ect. I would trust someone who has re-soldered before more than anything.
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