I am on my second GPR in three weeks. Put a new one in two days ago and everything seemed fine but went to start my truck after work and it was a no go, it draned my batteries so I had to get it jumped.. Took it to the dealership today and they called me about two hours ago and said they tested the ficm and it was bad. From what I read on here your supposed to test the ficm when its cold?? They told me they tested it and it threw a code.. do you think they are just going off what the code says?

 

ok why do you think your killing gpcms?
and no the dealer is more then likely correct. we can make the truck think its what ever temp we want. we have cool tools like that

 

Well I want a cool tool like that then..

The first one I replaced because the back of the box was cracked, due to heat I believe, so I took it apart and the upper right was all black on the inside. With the new one it ran great for about two weeks and then when left un plugged would not start, so I took it off to look and it cracked again. I got a refund on the first one so I just replaced it. Left the truck un plugged and got up at 4, it was 15 degrees out and it started just fine, it ran like crap for a bit then was fine, then later that day after it was cold again wouldn't start. Then it killed the batteries.

I am new to diesels and working on this thing is not like working on my dirt bike or sled.. so I thought I read here to test ficm when cold..

The dealer called and said ficm is bad, but he said that doesn't have anything to do with GPR, he also said my batteries were bad. They tested at 80% but CCA was 650 on one and 500 on the other, he also told me that a low or bad battery does not ruin an ficm.. maybe I read that wrong too, but I thought one or the other being bad could hurt the other.

Sorry I don't know much about this other than what I have been reading on here in the last two months. I really appreciate the help.

 

basicly they have a tool that is an gauage tester, just a riostat set up. you can do the same thing with less then $2.00 by going and getting some resistors and hooking them in line to the eot sensor.
if your melting the inside of the connectors of the gpcm test for a shorted glow plug. also check the harness side for burnt or damaged pins.
there is a tsb for ficm testing that clearly states that failed batteries will cause a ficm failer

 

OK, I will test the plugs.

Thank you,