indeepwithajeep

I was helping someone get some readings for the relay fan switch lines. I stupidly checked the ASD relay by accident. I shorted out pin 86 with a 1 amp diode in route to it grounding (so not too much current drawn).

Ended up with a no bus on the cluster.

So far I've:
Checked all fuses under hood (Passed)
Attempted a PCM restart (Failed, cluster wouldn't respond)
Attempted a PCM scan for faults (Failed, error couldn't read ECU)
Tested the OBD2 bus ports (Passed, 2.5v @ each (pin 3 & 11)
Tolerance tested CPS just because (Pass)
Tested ASD relay (passed)
Tolerance tested ASD to PCM C3 pin (passed)

Fairly safe to say its my PCM? anything I missed? I was thinking about pulling my fuse box to check wiring.

I'm helping a friend build a fan controller is the reason I got into this mess. Dumb on my part mistaking that relay.

indeepwithajeep

bump

jordan96xj

Usually people jump to the computer as a cause way to soon (without testing).

In your case, you might very well be right. Can you get a hold of a computer to swap and test?

indeepwithajeep

I found someone local with one.. He's not going for my price. I'm seeing online they'll program the PCM to your vin and millage. Is this something I'll need? Will I have things not work even though the PCM number matches?

I know they store miles both on your cluster and ECU. So if you swap a cluster that reads differently your PCM will retain the miles in the background.

Between that and a warranty is the reason I'm not going much higher for the local guy. I know the dealer wants ~$140 to reprogram your cluster. So if I'm paying $60 for a PCM that needs to be programmed I'm paying more and not getting a warranty.

indeepwithajeep

I thought about jumping the ASD to make sure it's not sensor related. Although if I'm not able to connect to the ECU I'd think that wouldn't matter much.

indeepwithajeep

Update:
I got ahold of the FSM which had much better schematics. I traced it a fuse to the junction box (Chiltons only showed it tied to the power distribution center). Anyways the 20amp on fuse 11 was popped. She lives again.