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

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post #211 of 213 Old 01-20-2017, 09:13 PM
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1997 ZJ 
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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.

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post #212 of 213 Old 03-06-2017, 02:18 PM
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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.
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post #213 of 213 Old 03-06-2017, 03:02 PM
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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.

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