My '02 PSD has been dying randomly in reverse or at idle.

Things I've done to it so far are:

-changed oil
-new International blue CPS
-new fuel filter
-cleaned battery connections
-checked the wires on the steering column for chaffing
-checked the wires on the drivers side valve cover for chaffing
-OHM'd out plugs and injectors, though I may do this again just to be sure

Codes I am getting are P0603 and P0344. I bought the truck used and have no idea if it has a chip in it or not. I have heard that P0603 is an indicator of an aftermarket chip. If there is one, how can I tell? Do these things go bad?

 

Have you checked to make sure the large connector on the drivers side valve cover is fully connected and the bolt is tight? Don't overtighten it, but that may be somewhere to check. The bottom of the harness likes to rub the cover as well, that is something worth checking too...

 

This problem was resolved at this link:

*FIXED*P0603, P0344. New CPS, still getting intermittent coughing/hiccuping/skipping. - Page 9 - Ford Truck Enthusiasts Forums