PCM and Battery - Rubicon Owners Forum
  • 3 Post By johncanfield
  • 2 Post By WayWestJeep
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post #1 of 3 (permalink) Old 08-15-2019, 08:19 PM Thread Starter
Rubicus Maximus
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Join Date: Jun 2004
Location: Southern California
Posts: 1,261
PCM and Battery

In the shop manual on a trouble shooting step it says...

Turn the ignition off.
Disconnect the PCM harness connectors.

The manual doesn't mess around and would tell you to disconnect the battery if it was needed, but I thought I would run this by you.

Just do what I'm told right?

It doesn't matter who you are until you are whom you are supposed to be.
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post #2 of 3 (permalink) Old 08-16-2019, 09:09 AM
johncanfield's Avatar
Join Date: Oct 2010
Location: Texas Hill Country
Posts: 10,333
I've successfully unplugged the PCM cables with the battery still connected. Either way should work fine.
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John - WB5THT
2006 LJ, not stock
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post #3 of 3 (permalink) Old 08-16-2019, 10:37 PM
Rubi Crawler
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Join Date: Jan 2018
Posts: 276
Originally Posted by johncanfield View Post
I've successfully unplugged the PCM cables with the battery still connected. Either way should work fine.
When I had my PCM woes I did this also without issue. The only way I found to reset the PCM was to leave it unplugged over night.
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