2005 4L not starting - OBD plug almost catching fire - and it gets weirder - Jeep Wrangler Forum
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Old 08-25-2012, 03:45 PM   #1
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2005 4L not starting - OBD plug almost catching fire - and it gets weirder

I've been having some strange engine electrical problems lately, which seem to get worse when it's humid. So I've been going through all of the engine electrical, replacing sensors and checking wiring.

Now things have just gotten really weird.

The starter will crank, the engine turns over, but doesn't fire. However, if I plug a cable into the OBDII plug, the engine fires up and runs perfectly. There's nothing connected to the cable - it ends in a serial plug (meant to plug into a USB OBDII reader).

I would just leave that plugged in and call it good, but when it's plugged in the socket and the wiring under the dash gets really hot. I'd prefer not to have to use the fire extinguisher...

I checked that pins 4 and 5 are grounding properly and 16 is getting correct voltage when the key is on.

Ideally I'd like to figure out where the connections for the OBD plug terminate so that I can check all of that wiring, but the wires disappear into a bundle of wires I've not been able to trace through yet.

Does anyone know where the OBD wires terminate and/or have any ideas as to what might be causing this?

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Old 08-26-2012, 10:42 AM   #2
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I'm srry I don't have a solution for you but you do have my sympathies! I too am experiencing Electical problems, with my TJ, and I know how frustrating they are. :-(

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Old 08-26-2012, 11:48 AM   #3
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Originally Posted by Evpjr View Post
I'm srry I don't have a solution for you but you do have my sympathies! I too am experiencing Electical problems, with my TJ, and I know how frustrating they are. :-(
Hehe... Thanks.

I've been unwinding the wire loom and I think it's somewhere under the dashboard. There were a lot of opportunities for Chrysler to make things easy to debug/fix. The dashboard is a pretty big failure on their part.

What issue are you having? I've gotten extremely familiar with the TJ electrical system.
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