First of all I want to apologize for the long winded post, but unfortunately its a pretty complex problem.
I’m working on a buddies 2013 Jeep Wrangler 3.6L, we’re finishing up a complete back half / truggy project and have run into an electrical problem. In the process of the project I had to remove a bunch of modules as well as cut out some excess harnesses. Any wires that were cut, were also individually heat sealed to prevent shorting the system.
These harnesses were shortened and heat sealed:
Tail light harness
Rear door/wiper/washer etc.
I’ve had the battery disconnected for “Most” of the project until I had to purge the hydraulic ram. Obviously I had the Jeep running to purge the system and didn’t have any starting or running issues. The first problem was when I was running the steering wheel back and forth, I oversteered the clock spring and broke it. I didn’t have any issues at this time. When I finished purging the system I moved onto fabrication and welding the front winch mount, this was where I forgot to disconnect the battery. Once the winch mount was done, I moved onto bleeding the brakes, we did this without starting the Jeep.
OK so here’s where we stand. When we initially turn the key to the “On” position nothing happens, the instrument cluster stays off/blank. Once we either turn on the headlights or step on the brake pedal everything comes on. Meaning the instrument cluster/fuel pump turn on. At this point we have multiple warning indicators as well as park reverse neutral and drive indicators are illuminated and we have a “hot oil” message. And nothing happens when turning the key to “Start”
The first thing I did was verify that I have good grounds on all the circuits that I moved or messed with. Then I checked along those wires for any nicks or cuts. I then checked to make sure that all the modules I messed with were plugged in securely. Then I removed the steering wheel and disconnected all the clock spring connectors. At this point I got help from another buddy.
We’ve attempted to diagnose this with a Chrysler POD and Snap-on Solus Plus:
There were tons of “no connection” codes, unfortunately I don’t have them recorded. We’ve got multiple modules with no communication. As well as some funky things going on. The TIPM is not sensing the key in the ignition. When the key is in the “Off” position, the TIPM is reading it as in the on/start position. When the key is in the “On” or “Start” position the TIPM reads it as being in the off position. When the key is initially turned to the start position, nothing happens. The TIPM does not recognize any change of state either.
We have power and ground at all modules. We checked for continuity to ground on the CAN+ and CAN- circuits. We didn’t find anything grounded out or crossed but we did find a weird bouncing of 16ohm to overload. We determined that it was from the anti-lock brake module, once we unplugged it, the bouncing went away and we had no path to ground. But still no change, no start.
The following items are unplugged/disconnected.
All air bags
Clock spring (this broke while the engine was running)
Rear wheel speed sensors (currently unplugged)
Tail light harness
So at this point I’m at a loss, any help would be greatly appreciated.
Project can be seen 0n Instagram