stumped, OBD-II MJ issuses

[shelbyluvv]

This morning my check engine light came on when I started it. Ran crappy but made it to work. Came out at lunchtime and as soon as I got to the truck the horn started blowing. I unplugged them and went to lunch. Changed the TPS at lunch and pulled the horn relay.

 

Check engine light went off.

 

Now the fun part. As soon as I plug the horn relay in it shuts the truck off and throws a TPS code.

 

Pull relay, reset code and runs fine.

 

I disconnected the horn button, air bag and cruise buttons from the steering wheel. Plug in horn relay and shuts her down and TPS code is back.

 

We had a pretty bad storm last night but I didn't drive the truck. What in the world is causing this mess?

[HOrnbrod]

Man, that's a strange one. Security system malfunction?

[Jeep Driver]

Same exact problem with the wife's 97.

 

Airbag light bulb finally burned out about a month ago.

 

I removed the tab from the horn so it can never be plugged back in, two weeks ago.

 

Now I'm waiting on the check engine light bulb to burn out.

 

 

Absolute POS.

 

 

But it's a beautiful SE and runs better than any other we've owned........great Jeep.

 

 

 

 

 

I'm still looking for her a '84 or '85......nothing like a Renix......and of course a classic.

[Akula69]

Notwithstanding the rocks that are being thrown back and forth...let me suggest:

 

Did you check the harness going up into the column for chafing or a split/cut? Do you have the SKIM module plugged in to the harness directly below the column (the plug is there regardless - does the plug have damage?) .

 

I'm thinking short - its only way I can see the horn relay could throw the TPS code. I assume you've tried swapping the relays around to check them...

 

The fuse box is obviously part of the bus system...have you done any work around it lately?

[shelbyluvv]

I cleaned up the thread to keep it on track. I have checked all the usual suspects, grounds, chaffed wires, clock spring, relays, etc...

 

I'll check the SKIM as well.

 

I think I have it narrowed down to the actual fuse panel on the passenger kick panel. I have a spare one that I am going to swap in tonight after work.

 

It ran great this morning too.

[Akula69]

There are so many sources of short in that panel its not even funny. I would suggest unplugging the door harnesses and the visor harnesses, then plugging in the relay. if it still faults, pull and check the plug that is held in with the 10MM bolt. We had a good bit of corrosion under that guy (1.5 inch square with a silver bolt in center) due to a drip that was traveling down the radio lead.

[shelbyluvv]

I tried that as well. I removed every wire, fuse, relay and plug on the fuse panel and checked for corrosion. I can't find any. It may be a internal issue with the panel. I love electrical issues. They really make you think.

 

I appreciate all of your suggestions and think you hit it on the head with the antenna lead dripping water onto the panel.

[Incommando]

I am sorry for your troubles. Strange gremlins and (hopefully) their cures are so interesting

[shelbyluvv]

It was as suspected. The fuse panel was bad. No outward signs of damage to be seen. It must have an internal fault. Thanks for all the help Akula69.

[Akula69]

No problem - glad to try.

 

Called the Chrysler / Jeep dealership here on Friday to see about paying to have a remote programed (with the DRBIII) for my wife's 04 WJ....the service rep briskly announced they no longer provide service for such 'older' vehicles. Must be profitable in the automobile industry these days.

 

Seems our combined knowledge is pretty much all we have.

[shelbyluvv]

There is a member here that does it. I want to say it was Terrawombat.

[GrizzzzBear]

What year is your MJ???

Was your Computer Replaced???

Never heard of a STOCK Mj with the Second Gen of the OBD Computer.

[shelbyluvv]

89 with a full 97 conversion