96-98 PCM repair procedure W/Pictures - Page 15 - JeepForum.com

LinkBack Thread Tools
post #211 of 214 Old 01-20-2017, 09:13 PM
Registered User
1997 ZJ 
Join Date: Dec 2008
Posts: 8,979
Unless you can get it stall by moving the connector or tapping on the case, it could be counter productive to tear into the PCM.

Not trying to discourage you, but it takes a good bit of skill to get the reflow going your way. Preheating the board with a hot air gun helps. And so does a temp controlled soldering iron. Try it on an old computer board or something to get some practice.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
ZeeJay1997 is offline  
Sponsored Links
post #212 of 214 Old 03-06-2017, 02:18 PM
Registered User
Join Date: Jul 2015
Location: BOGOTA
Posts: 2
Excellent post JS97ZJ, thanks for the info, I did follow your instruction, but the layout of my ECU (Jeep Cherokee XJ 1998 Sport), it's a bit different (DSCN1679.JPG), however I did found the series of pins that needed to be re-welded (DSCN1683.JPG), and heat them up without removing the actual welding material but adding some more as needed. To sumarize, the procedure was really simple, BUT when I reconnect the ECU to the three big 32-way connectors (gray, white, black), wasn't unable to acces the ECU via the OBD-II port and nor even the fuel-pump start (which was my starting issue), with the swith on, so maybe you have some insight on what to do next. Thanks a lot.
Attached Thumbnails
DSCN1682.jpg   DSCN1683.jpg  
post #213 of 214 Old 03-06-2017, 03:02 PM
Hears the voices
kg6mov's Avatar
1996 ZJ 
Join Date: Nov 2012
Location: Cupertino
Posts: 12,824
If your PCM is now dead, the next step is get a new PCM.

The procedure outlined in this thread is pretty specific to the older style boards, it's not applicable to your PCM. The newer flex boards don't quite have the same problem with solder joints and they're very easy to damage if you don't have a lot of electronic rework experience.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1984 F250, 460 BB, T19, work truck/future tow pig
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style

Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
kg6mov is online now  
post #214 of 214 Old 05-22-2017, 11:53 PM
Registered User
Join Date: May 2017
Posts: 1
Hi there, I was wondering if OP might be around to help me out with a picture.
Ive got a 98 Dakota with this issue using the same style PCM as in the OP. The truck is my only means of transportation and i was unable to find a direct part match available anywhere in town so i ended up getting a unit for a 2000 dakota at the junkyard to stand in while i fix or replace the original unit.

I do not have easy access to a blowtorch and Vice, but was able to get the mb removed from the casing by sitting it above the heating element of a stove. I do not recommend doing this unless you have no other option. Also my unit was a mopar reman unit that was installed at the dealer for a software update TSB (dealer couldnt update the one it came with?) which had silver paint on the casing which caught fire during heating for removal of the mb.

Now that ive got the mb out of the casing i just want to be sure that i didnt damage the PCB in any way while i remove the potting, but the images in the OP are very low resolution and i cant really use them for comparison. does anyone have higher resolution shots of the back side of the PCB with the potting removed?

Nemesis158 is offline  

Quick Reply

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
CRD Oil Change Procedure rhusak WK Grand Cherokee & XK Commander Forum 5 08-28-2010 07:59 PM
procedure from 4hi to 4lo 69speed ZJ Grand Cherokee Forum 3 10-08-2007 09:33 PM
CAT Removal Procedure kdavis ZJ Grand Cherokee Forum 24 09-24-2007 06:51 AM
Connecticut Repair Shops Capable of Axle Repair? dogbait ZJ Grand Cherokee Forum 2 02-12-2007 06:28 PM
Cleaning procedure Endurancevm ZJ Grand Cherokee Forum 5 03-18-2006 05:08 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome