FCIM Voltage Testing
Thread Starter
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
FCIM Voltage Testing
Per this guide:
https://www.ford-trucks.com/forums/8...procedure.html
With the 4 bolt model, i put a multi-meter on the far right bolt closest to the drivers side fender. In hte off position, i got 20.x volts. When my 8yr old daughter turned the key to on, I got still 20.x volts for the first 1 second or so, then 48.5v. Can someone tell me if this is a good voltage?
Also, if anyone is in hte immediate vacinity to the collegeville area, and would like to help themselves to a few beers and browse the forum on my laptop while i'm under the hood of my truck tonight and/or tomorrow, hit me up at 610-489-1018. Come on out, it's miller time!
Jay
p.s. It's a royal pita to jump up and down from the truck to check someothing on the net.
https://www.ford-trucks.com/forums/8...procedure.html
With the 4 bolt model, i put a multi-meter on the far right bolt closest to the drivers side fender. In hte off position, i got 20.x volts. When my 8yr old daughter turned the key to on, I got still 20.x volts for the first 1 second or so, then 48.5v. Can someone tell me if this is a good voltage?
Also, if anyone is in hte immediate vacinity to the collegeville area, and would like to help themselves to a few beers and browse the forum on my laptop while i'm under the hood of my truck tonight and/or tomorrow, hit me up at 610-489-1018. Come on out, it's miller time!
Jay
p.s. It's a royal pita to jump up and down from the truck to check someothing on the net.
Post Fiend
Joined: Oct 2009
Posts: 12,123
Likes: 35
From: N. Fort Worth, tx
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Post Fiend
Joined: Oct 2009
Posts: 12,123
Likes: 35
From: N. Fort Worth, tx
ficm;s can casues some very starange issues. freom fuel /injector to turbo , egr and ebp concerns.
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Thread Starter
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
engine off key off = 20v
engine off and key on = 48.5v
i didn't try it while cranking as it was my 8 year old daughter performing the key cycling, though i'm thinking i am going to try that one too.
any idea what a dealer ficm costs? i see them onine for $200-300 but i would like to see if i can get one tomorrow and get this out of the way this weekend. my neighbor just pulled up so i'm going to see if i can get him to cycle the key for me a few times.
engine off and key on = 48.5v
i didn't try it while cranking as it was my 8 year old daughter performing the key cycling, though i'm thinking i am going to try that one too.
any idea what a dealer ficm costs? i see them onine for $200-300 but i would like to see if i can get one tomorrow and get this out of the way this weekend. my neighbor just pulled up so i'm going to see if i can get him to cycle the key for me a few times.
Post Fiend
Joined: Oct 2009
Posts: 12,123
Likes: 35
From: N. Fort Worth, tx
I hate to say but I have never checked one with the key off. seems starange that you would see voltage at 20v as the relat iirc is powered via the pcm power relay as well, there for the dc/dc converter should be either base battery or 0v. hmmm Its been a long day 
Thread Starter
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
i figured out what the 20v was. the capacitors were just draining after the key was turned off. did it again and it started at 38v(time it took me to get from truck to under the hood) and drained clear to flat. it's 0v with the engine off.
while what sounds like a compressor from the left side of the engine is going off, i have 48.6-8v. the the compressor soundign thing goes off and it stays at that voltage. calling neighbor to have him cyce the key for me.
while what sounds like a compressor from the left side of the engine is going off, i have 48.6-8v. the the compressor soundign thing goes off and it stays at that voltage. calling neighbor to have him cyce the key for me.
Thread Starter
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
i cycled the key again and bam, 20.x voltage. The results were inconsistant so Im going with it's bad, chances are i did it right at least once and didn't get the desired results. Oh well, a hell of a lot easier than figuring out which injector it is, considering it wasn't throwing injector codes. Tomorrow I'll call the dealer and see what a ficm goes for.
THanks much for your help!
THanks much for your help!