01 Cummins with 300k, I got a p1762 and a p1763 code. Replaced all solenoids internal on the transmission.(haven't touch the internal wiring yet)  Ground is good, ran a jumper wire and by passed the pcm, made no change, 5volt line on data says it's stuck at 4.98 but doesn't show any v coming out of the pcm to the transmission, all grounds check out with a it break out box. Pickup is stuck in 3rd year with 108 gov press psi at idle and gov pr duty cyc is at 1, when you press the od switch, it's saying pressed but it turns right back off on snap on scanner. I can see life data and I have ran all relay test I am think of. Pcm has 12v coming in, ECM does also. 

Batteries have a good load on them, alternator checks out also.  My otc breakout box checks out, all grounds are good. 

I'm at a lost with this thing, I'm 99% sure it's the pcm, but how do I run a test on it or is there any way it is before I go throwing money at it. Sorry I haven't been on here for a long time! I quit putting money into my 01 haha 

TIA! 

 

Edited October 25, 20195 yr by fuze24v
Forgot something

Time to talk to @Dynamic...

  On 10/25/2019 at 12:54 PM, fuze24v said:

Replaced all solenoids internal on the transmission.(haven't touch the internal wiring yet)

The OD/TCC solenoids come with all the internal wiring needed.