Originally Posted by Weller
Hey guys, I could use your thoughts. I've got a 92 YJ with the 4.0, 5 speed. I'm driving home tonight and the Jeep kinda stalls as I'm pulling away from a stop sign. I come up to a light, and as I pull away, it jerks on me again but this time the check engine light comes on. I make it the rest of the way home with no problems. I check the codes, and I get the following codes:
PCM has been disconnected from the battery
Throttle Position Sensor
A/C Relay (I don't even have A/C!)
So, my initial thought is that I need to replace the TPS. But the PCM code is making me wonder if I just have a grounding issue? I didn't hit any bumps or anything when this all happened. And it actually has happened to me before. I've recently replaced the alternator, rotor, cap, wires, plugs, and had the battery checked. It had been running great for the past 2 or 3 weekends, but this problem is back.
Any thoughts? If I replace the TPS, the manual says I need to take it to a dealer to have it properly adjusted. What is this about? Can I do it myself?
Thanks for any help!
You can do it yourself, you just need a volt meter. TPS is very prone to grounding issues, as it's wires join into a hub with several wires and grounds. If one gets messed up, it screws up the TPS. If you have an automatic transmission, TPS problems will causes the tranny to shift crazy. I spent weeks chasing down problems on my XJ and eventually changed out the TPS and adjusted it and everything was fixed. THis can be a VERY frustrating process!
Here is an article on the different sensors:
Jeep Cherokee Engines - RENIX (non-HO) Engine Sensor Diagnostics
If you go to the NAXJA website (similar to this but for XJ's...Don't worry, almost everyone on there is super helpful to any Jeeper) and check Ecomike's posts. He is a genius with these problems and has a number of threads on how to diagnose and fix. Here is a link to his posts:
NAXJA Forums -::- North American XJ Association
You could also do a search on NAXJA, as there are a ton of similar threads with great detail.