Know anyone that has anther v-10 truck, that you can plug one of the dead PCM's into, and see what happens on another truck?

 

had a problem just like this.it was a pinched wire between the engine and trans. i had to take the trans cross member off and drop the trans to see the wire. if i remember it was one of the o2 senser wires

 

sounds like a great idea....i'll drop the freakin tranny.....o2 wire thing makes some sense of it

 

got it on the lift...can see around bellhousing under and on top....no pinched wires, so i see no need to dropp tranny, i did however take battery out and tray to look under fuse box and also see nothing, along the top of the engine runs and wiring harness that i disected, i found a couple of wires ( grounds) that are exposed but wouldnt think that would hurt anything....
now im clueless, i sent all my burnt pcms back to parts houses, order a used one online , will be here today
what do you recommend , ? unhook all sensors and plug in pcm?.....i'm hurtin here

i'm a knowledgable mechanic and own my own shop , not the best with electricals i may admit , but i feel sending to the dealership they are goonna f**k me hard

thanks

 

Disconnect EVERYTHING..... just leave the PCM, and the comm port hooked up. See if you can establish communication with the PCM.

 

this is freaking crazy......after the 3 NEW computers from fisher and carquest
that have no worked in the truck...i went and got on ebay and found one there with a different number on the ecu.....wait wait wait....3 days later
it arraives on my desk in my office.....axouisly ripped the box open and installed in the truck, turned the key on and its a miracle i have communication with the ecu.........OH MY GOD....WTF, i turned the key to start and vrrrrrrrmmmmm,
( but would not stay idling) let it warm up with my foot on the gas a couple minutes, 2 foot down the road i went, runs great shifts smooth, but acted like it was starting in 2nd gear or something.... dunno

got back to the shop, instantly pulled some codes p0743, p1764, p1765

gonna clear and drive again

wow, can you believe it?....no , me either,,

the dealer gave me a list of numbers that that truck could for the ecu and apparantly the list is inccorrect

 

all those codes are tranny codes, nothing unplugged from tranny,
clearing, clearing

 

p1764 comes back after clearing, seems like starting in 2nd shifts ok to 3rd n OD

TRUCK IDLES OK NOW

 

I'm shocked at this, shocked I tell you.

On the other hand, great to hear it's running. Been following the whole thread but had nothing to offer on causes aside from a bad short somewhere, but even that may not have been the case. Please keep us posted.

 

Awesome.Glad you got her running finally. Defective units or maybe they were not flashed with the correct options? Probably should take it to dealer (a different one) and have them flash it. The options, mileage, and vin will atleast be correct. If any of those apply. Might get rid of the tranny codes too.