Well a little update on my latest adventure with this truck. As I discussed in a different thread I spent a couple days chashing CAN comms issues. Which of course lead to deeper problems.

What started this was me loading a new tune into my truck. In talking with the tuner and follow the Workshop Service Manual I narrowed it to the PCM. I then talked with Ed at ficm repair and he helped me look at the charging system.

Now on the latest advice, tested the batteries, while a little low they still tested.ok. Now i.looked.at.my charging system. May have found the smoking gun (fingers crossed). I have a dual altnerator system on my truck which I think hid the issue. I just took the second alternator out of the system per Ford.Bulletin Q-91. And after the truck is warm, when I load tested test the alternator it is in the mid 12s at low idle and high 12s at high idle. So now I have ordered a new Bosch AL7606N 140 amp alternator to install.

I still need a new PCM but it works right now though it did finally throw a P0606 code. Also, I need to get the FICM tested, it it will probably be my next issue.

So the saga continues...

 

P0606 could easily be ONLY due to the alternator.

 

Confirmed with IDS the PCM is busted. Time to get a new one.

 

Sorry. That isn't common.