I have been diagnosing an issue on my dads truck for about a week, it would start for a few seconds then stall the first time starting it in the day then once you got it running it would start fine for the rest of the bad. It was also acting like it had a bad injector. I tested the ficm and sure enough 30 volts while running.

A local shop carried just the circuit board on the ficm that had the issues. Great! I picked it up this morning installed it, and the truck seemed to run much better, a lot better start time and throttle response. I drove it for around an hour and started it half a dozen times with no issues. ficm was at 48v the whole time. Problem solved.

Wrong! I went to drive the truck home started backing out of the lot at work and it just died. I went to get out moudis scan tool, ficm had ~12 volts going in and nothing where I should have had 48, i tried to crank it and see if it changed then the scan tool couldn't comminicate with the ficm.

sorry for the long story just had to rant a bit. Any ideas what to check all three plugs seemed to be plugged in, I didn't have time to really do anything from there. This is my first encounter with a powerstroke. What should i check? do I try to put the old circuit board back in and see if it will start?

 

Hi Nate, welcome to FTE!

I'm going to move this one down to the 6.0L Powerstroke forum, the folks there will be able to help you with this.

 

Probably Just did NOT Get the 3 Plugs in the Bottom of FICM Fulley seated they must Click

Id check that^^^First

where did you get the circut board??? Must just been the Power Side of FICM

You have a Power side and a Injector Driver side to a FICM basicaly

There are 3 Powers to check
FICM Vehicle power=12volt
FICM Lodgic power=12volts
FICM Main Power=48volts

Did you undo a ground wire when you took FICM OFF??

 

I did not have my ground disconected... I actually can't believe i forgot that. I bought the small ciruit board, not the one with the connecters.

when I first installed it and checked with the computer and it had 12, 12, 48 volts. the after it wouldn't start i scaner said there was no voltage anywhere, and the ficm wasn't synced

I got the circuit board form a local salvage yard, that buys them from some where out of the states, he didn't say where.

If not disconecting the ground was going to cause an issue wouldn't it have done it right away?

 

Never mind

 

Well most of us send them to www.ficmrepair.com

Ed has a plan if need to keep truck going

BUT Since your already got this one check the FICM Plugs at Bottom of unit all 3 of them

Then there is a Fuse/relay box right there by master brake cylinder inside you have a Fuse and a Relay that Both Go to the FICM

theFuse and relay goes to FICM Lodgic power and FICM MAin Power

It should have FICm Vehicle Power since it Lost all 3 I suspect those Plugs under ficm

Its not letting me post the fuse/relay box the one in the engine compartment so do a search

RUSTYAXELROD was the Poster

I think Bismic has a Copy

FICM INFO AND GUIDE


http://api.viglink.com/api/click?for...13663471511752
Click here^^^^^^

 

Originally posted by Rusty Axelrod