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Topic Review (Newest First)
08-06-2013 12:10 AM
RUBI 4 MY MRS Is it great when it is something simple or at least easy to spot when you get to the right place?

As for the code, it also relates to the fuel tank sending unit so that might be something to check. But at least it is running again.
08-06-2013 12:01 AM
ranger44 HUGE thanks to RUBI for all the info. That was exactly the problem. Pulled the PDC, and found the red/white wire in the F6 spot that was crimped to a green wire. Not sure why it was that way, but further down the line it switched back to red/white. The first joint closest to the fuse was pretty corroded at the crimp point. Cut that out and joined it with a new connector. That was the ticket. Put it all back together and the fuse didn't pop! Started right up, and now I am back in business.

I had the battery disconnected during this excursion, and I got rid of code 25, but I still get code 42.

I also don't know if it is because of being parked on my sloped driveway for a week, but the exhaust is pretty strong. I hope this did not effect the O2 sensor I replaced just a couple months ago.


Attachment 282227



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Attachment 282225
08-05-2013 08:15 PM
RUBI 4 MY MRS I knew you meant PDC & yes this may well be related to code 42, especially if the wire to the relay is bad. I remember one guy had the wire break off right at the terminal crimp from corrosion. If you lose power to the ASD it will cause loss to the other things listed as code 42 failures. That could start as an intermittent “open” connection. It might have broken & the end of the wire might be touching ground now. Report what you find to help the next guy.

Go here & the PDC is chapter 11 in the wiring section.

Jeep Knowledge Base
You may have to go to the bottom of the page & pick Jeep Resources & online manuals if it directs you to home page rather than the knowledge base.
Pick your model & year then on the drop down menu pick the chapter you need.
08-05-2013 07:05 PM
ranger44
Quote:
Originally Posted by RUBI 4 MY MRS View Post
Fuse #6 in the PDC goes to the ASD relay terminal 30, also in the PDC, & has a splice that goes to the black connector of the PCM. The wires are red/white. If the fuse blows as soon as you put it in & the key is off the ASD relay is open so the short will not be past the relay. The wire from the fuse to the relay will be under the PDC so easy to check. If not there follow the harness up to the PDC. If not there I suppose the PCM could have an internal short. You can check that by pulling the black connector off the PCM & seeing if the fuse blows or not. Now if the fuse blows only after the key is on then it could be further downstream but start by pulling the ASD relay & rechecking the fuse.
This may also help remedy the lingering code 42 I have had since I have owned it.
08-05-2013 07:02 PM
ranger44
Quote:
Originally Posted by RUBI 4 MY MRS View Post
Fuse #6 in the PDC goes to the ASD relay terminal 30, also in the PDC, & has a splice that goes to the black connector of the PCM. The wires are red/white. If the fuse blows as soon as you put it in & the key is off the ASD relay is open so the short will not be past the relay. The wire from the fuse to the relay will be under the PDC so easy to check. If not there follow the harness up to the PDC. If not there I suppose the PCM could have an internal short. You can check that by pulling the black connector off the PCM & seeing if the fuse blows or not. Now if the fuse blows only after the key is on then it could be further downstream but start by pulling the ASD relay & rechecking the fuse.
Thanks for the info! I mistakenly said PCM when referring to the PDC in my OP. I will check it tonight and report back.

Also, does anyone have a diagram of the PDC?
08-05-2013 06:07 PM
RUBI 4 MY MRS Fuse #6 in the PDC goes to the ASD relay terminal 30, also in the PDC, & has a splice that goes to the black connector of the PCM. The wires are red/white. If the fuse blows as soon as you put it in & the key is off the ASD relay is open so the short will not be past the relay. The wire from the fuse to the relay will be under the PDC so easy to check. If not there follow the harness up to the PDC. If not there I suppose the PCM could have an internal short. You can check that by pulling the black connector off the PCM & seeing if the fuse blows or not. Now if the fuse blows only after the key is on then it could be further downstream but start by pulling the ASD relay & rechecking the fuse.
08-05-2013 05:30 PM
ranger44
Electrical issue. Need help!

Hey all,
While driving to work on the highway the other day, the engine died. I had all electronics working and it turns over. While waiting for the tow truck, I was checking all I could. Luckily, I found a sign of what was going on, but I have no idea where to go from here.

In the PCM, 30A fuse in position F6 was blown. Put a spare in and immediately blew it as soon as it touched the contacts. I don't have an owner's manual or schematic to know what F6 controls. I think I saw it has something to do with ignition. I have radio, lights, everything except for gauges. They don't move when I turn the key.

Obviously something has shorted, so I was wanting to know where to look. Is there is a common spot to cause this? I have also read some people had O2 sensor wires melt to the exhaust, but that is not the case here.

All help is appreciated, and I hope to find the spot so I can get back on (and off) the road again. I currently have a 3000 pound driveway block right now. Thanks!

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