Join Date: Sep 2009
Location: Parkersburg, WV
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Wiring harness/ficm issues?
Looking for some ideas/advice
2004 6.0 with 195k miles, been running good until a short road trip when it started running a little rough. Turned it off for a couple minutes then restarted and it seemed to be fine. Two days later was idling at a red light when it suddenly began to run very rough with virtually no throttle response, just enough to coax it into a parking lot next to me. Turned it off, waited a few minutes and it started right back up but was still just bearly running.
Had it towed to my house where it sat till I had time to get to it. It would not restart after that, a few cyl would fire but not enough to start.
Scanned it with Auto Enginuity: P0281, P0284 cyl 7,8 injector circuit contribution/balance fault.
Installed fuel pressure gauge: 60psi during cranking. Was not sure so I checked the ficm voltage: 48.1V
Rescanned with CAN enabled(still figuring this thing out): P0265, P0268, P0274 injector circuit high for cyl 2, 3, 5. I have been using the Ford Repair Manual on cd 2004(ebay) plus doing a lot Internet research. I'm not a mechanic but not affraid to get my hands dirty.
So it said to check the harness side injector pins for shorts to ground, voltage, and between each of the four pins. Sure enough on cyl 2, 3, and 5 each #2 pin had 48V with KOEO (the cylinders with no codes had no voltage). Also noticed some chafing on the injector wiring harness in a few places, especially at injector 5.
Does anybody know why I would be seeing 48V at those pins? It is my understanding the the ficm does not energize the injectors until cranking. So do I have a bad ficm? Or is it in the wiring harness? Both? Or am I missing something here? Should I be checking something else?
Any advice/thoughts/ideas would be greatly appreciated.