FICM results and codes, input needed

[wackston]

hey guys I've been having some cold start issues lately, truck starts fine with block heater plugged in for a while, I did a search and took the liberty of doing the FICM voltage test,,,, with the key on the voltage drops to 35 for about 3 seconds i think while the fuel system pressurizes, then it jumps back to 48-49 and stays there during cranking and with engine running, would this slight drop in voltage warrent a FICM repair/replacement???,,, also I'm pulling this codes with my Edge EVO,,, p0603 - Internal Ctrl Mod Kam error
P0683 - Glow plug CTRL Mod To PCM Comm Circ
also pulling p1000 I think the one that says checks not complete more driving needed,,, but I always get this code

would either of these codes explain the hard cold starts?, I'd immagine that the glow plug one may have an effect, if so is there a more detailed description of this code ie what exactly is wrong,,,, thanks guys I already did a search and I'm having trouble finding an answer

[RTR stroker]

p0603 Keep Alive Memory can be from disconnecting your batteries so that may be the case for that. And for your ficm it shouldnt fall that low so that could be your problem, And when your having your cold start issues are you getting any smoke?

[wackston]

yes, today it wasnt that cold out, and no smoke, but if I try to start it in the morning before work it will just crank over and fire every once and a while and white smoke will pour out of the exhaust, its kind of coolently smelling but also smells like raw diesel aswell, I'm pretty positive that my oil cooler is plugged as I do get flash boiling from the degass if I am pulling large hills, I did have the batteries disconnected a few days ago to replace the starter, BTW both batteries tested good,, this truck is starting to be a headache, havnt had any problems up until a few weeks ago

[wackston]

so even with that drop in voltage for that short of a time could mean that the FICM is bad?, I did the voltage test with the engine cold aswell

[a2elvis]

Originally Posted by wackston

so even with that drop in voltage for that short of a time could mean that the FICM is bad?, I did the voltage test with the engine cold aswell

If the FICM voltage drops below 47V at any time it is need of repair or replacement

[RTR stroker]

Since your getting low volts on ficm you could have multiple problems..Not to fuel the fire..but the smoke could be raw fuel from injector or glow plug system problems.

[ars5147]

FICM is goin bad. Check the plugs on the glow plug relay and wire for chafing. But the FICM should not drop that far. Definitely get that fixed before it leads to more problems.

[wackston]

dumb question coming up,,,,,,,,,,,,,,, wheres the glow plug relay lol

[wackston]

Originally Posted by RTR stroker

Since your getting low volts on ficm you could have multiple problems..Not to fuel the fire..but the smoke could be raw fuel from injector or glow plug system problems.

would that possibly explain why im pulling that p0683 code?

[ars5147]

Passenger side valve cove below the alternator, should have a green plug and a black plug, well pretty sure black, I know at least one is green.