Originally Posted by c4668

First off I bought this truck not running, the ficm was missing the engine and fi wiring harnesses were burned. Replaced both harnesses with ones from an 06, installed ficm. Tried to start, would not crank no ground to the starter relay. Pulled the Pcm from my 05 plugged it in and fired right off. Truck will run and idle with the 05 pcm but no throttle. Ordered 04 pcm installed again no crank injectors don't fire. Tried to reprogram the new pcm would not read. Sent it back received 2nd pcm guaranteed "good" this time. installed same no crank no injectors, took it to ford today to try programing this one still no luck will not read the pcm will not take the program. My question is what is the difference in the 04 and the 06 harnesses and is this my problem and not the Pcms? Also where can i find wiring diagrams for the engine harness? Thanks