FICM HELP!
Fleet Mechanic
Joined: Jul 2018
Posts: 1,629
Likes: 103
From: Jacksonville Florida
48 to 48.5 is good, a litle less say 47 is ok. But you start seeing 46 or less not good. Ficm repair is who you should talk to.
I think you can look them up at Ficm repair.com they're really good.
I think you can look them up at Ficm repair.com they're really good.
Fleet Owner
Joined: Nov 2003
Posts: 27,894
Likes: 3,613
Former Vendor
Joined: Feb 2010
Posts: 1,803
Likes: 5
A bad FICM can indeed cause our trucks to stall.
Commonly when this happens, the ‘IDM fuse’ blows, but not always. When heat related (if it restarts and runs great until it warms up again), this is indicative of a damaged logic board. When this is the case, SOMETHING always caused it. Commonly this is a bad voltage regulator in the alternator (sometimes that only shows up on a test bench when the unit is physically hot to the touch). Another common cause is the truck being cranked in an attempt to purge the air out of the high pressure oil system following the replacing of an injector or other action that introduced air into the system (the FICM relay should be pulled in this process to prevent FICM damage).
We work on both sides of the FICM. Let me know if we can assist!
Hope this information helps! Thanks for the referral, VI!
Ed
Commonly when this happens, the ‘IDM fuse’ blows, but not always. When heat related (if it restarts and runs great until it warms up again), this is indicative of a damaged logic board. When this is the case, SOMETHING always caused it. Commonly this is a bad voltage regulator in the alternator (sometimes that only shows up on a test bench when the unit is physically hot to the touch). Another common cause is the truck being cranked in an attempt to purge the air out of the high pressure oil system following the replacing of an injector or other action that introduced air into the system (the FICM relay should be pulled in this process to prevent FICM damage).
We work on both sides of the FICM. Let me know if we can assist!
Hope this information helps! Thanks for the referral, VI!
Ed
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
A bad FICM can indeed cause our trucks to stall.
Commonly when this happens, the ‘IDM fuse’ blows, but not always. When heat related (if it restarts and runs great until it warms up again), this is indicative of a damaged logic board. When this is the case, SOMETHING always caused it. Commonly this is a bad voltage regulator in the alternator (sometimes that only shows up on a test bench when the unit is physically hot to the touch). Another common cause is the truck being cranked in an attempt to purge the air out of the high pressure oil system following the replacing of an injector or other action that introduced air into the system (the FICM relay should be pulled in this process to prevent FICM damage).
We work on both sides of the FICM. Let me know if we can assist!
Hope this information helps! Thanks for the referral, VI!
Ed
Commonly when this happens, the ‘IDM fuse’ blows, but not always. When heat related (if it restarts and runs great until it warms up again), this is indicative of a damaged logic board. When this is the case, SOMETHING always caused it. Commonly this is a bad voltage regulator in the alternator (sometimes that only shows up on a test bench when the unit is physically hot to the touch). Another common cause is the truck being cranked in an attempt to purge the air out of the high pressure oil system following the replacing of an injector or other action that introduced air into the system (the FICM relay should be pulled in this process to prevent FICM damage).
We work on both sides of the FICM. Let me know if we can assist!
Hope this information helps! Thanks for the referral, VI!
Ed
Driving down the road and it just quit like I had turned the key off. I rolled to a stop and tried a restart. Turned the key on saw 48v and it
dropped like the water level in a bucket that has a large hole in it.
Pulled the FICM and found a hole through the power board and the IDM (50A) fuse was blown.
There was no warning at all.
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