LLY FICM

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
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It’s not that they didn’t transfer over, it’s that they are old links.

I’ve updated and fixed all the ones above
 

PureHybrid

Isuzu Shakes IT
Feb 15, 2012
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Ended up getting a used one from Dallas. I had called DHD, they were supposed to have some refurbished ones come in. Had an LLY ficm paid for, Nick called me and claimed it came back bad. DHD also send theirs to SIA, according to Chad? Someone wanting to fiddle with a bad one might be able to contact DHD... Couple things transpired after that, made them lose a customer.... Oh well.
 

2004LB7

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This one's going to be tricky to repair but it does look possible. This is what I found under the middle capacitor. Going to take some bridging and may not look pretty. Need to carefully clean it up a bit more before proceeding

I think the capacitor leaked and shorted out the buss which burned op the trace. These are only 14 volt capacitors so either they are way under rated for the battery voltage or they are using them on a 5 volt rail to power all the intergraded circuits.

IMG_20230223_222201~01-01.jpeg
 
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1FastBrick

Well-known member
Dec 1, 2016
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So is this something that should be checked for or possibly replaced in certain time frame in an attempt to mitigate the problem??? These are like 18 years old now....
 

PureHybrid

Isuzu Shakes IT
Feb 15, 2012
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Central OH
That would be a good idea to replace components or upgrade older working units. I'd be willing to send out this good used FICM if it would solve future failures
 

2004LB7

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If anyone wants to preorder some capacitors to have when you decide to have them replaced, there are three 470uf - 14volt electrolytic, and two 330 uf - 63volt ones. Id stick with a good known manufacturer like one of these:

Rubycon
United Chemi-Con (or Nippon Chemi-Con)
Nichicon
Sanyo/Suncon
Panasonic
Hitachi

The OEM ones are Vishay / BC Components which I don't know the quality of. They are 125c rated. Higher temperature rating is good. And higher voltage rating on replacements won't hurt but can increase their tolerance for voltage spikes, also good. I wouldn't mess around with the capacitance values, especially the 330uf ones as I believe those are the ones that drive the injectors and higher or lower capacitance may change the injector lag causing all sorts of tuning or fueling issues

Also, if you have multiple to choose from when shopping around, choose the ones with the lowest ESR or impedance that you can. But also keep in mind the dimensions. Stock ones, 470uf look to be 21 mm tall by 11 or 12 mm in diameter. The 330ufs are the same height at 21 mm but 18 mm wide. There is enough room to go about 2 mm taller before hitting the case and maybe 1 mm diameter in width

Once again

3x capacitors at 470uf, 14 volts or more, 23 mm or less in height, 12 mm or less in diameter, 5 mm lead spacing, 125° or higher operating temperature

2x at 330uf, 63 volts or more, 23 mm or less in height, 19 mm or less in diameter, 7.5 mm lead spacing, 125° or higher operating temperature
 

2004LB7

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Here's a replacement for the exploded capacitor. This one has a much higher rated voltage so hopefully it doesn't spluge all over the board like the original. From doing some online research, it appears that these capacitors are the normal culprit for FICM failure.


PS: you'll need three of these if you don't remember
 
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PureHybrid

Isuzu Shakes IT
Feb 15, 2012
3,517
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Mmm microfarads, that rings a bell.

Are those all that get replaced when companies upgrade the Ford FICM to a higher operating voltage?
 

2004LB7

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I'm pretty sure the Ford one's are just capacitors too but haven't looked too much into it as I don't drive a Ford 😛
 

2004LB7

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I'm going to see if I can find a replacement for the injector driver capacitors
 

2004LB7

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These are the best ones I could find. Not as high service life as I'd like but probably the same as the original. But keep in mind that for every 10C drop from it's rated temperature doubles the life. So relocating the FICM off the engine and into a cooler area may make a bigger difference then anything else. So if you don't have the means to open it up and replace the caps then at least move it

Here are the replacement capacitors. You'll need two of these

 
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turbovan

Too many toys!!!
Mar 4, 2018
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These are the best ones I could find. Not as high service life as I'd like but probably the same as the original. But keep in mind that for every 10C drop from it's rated temperature doubles the life. So relocating the FICM off the engine and into a cooler area may make a bigger difference then anything else. So if you don't have the means to open it up and replace the caps then at least move it

Here are the replacement capacitors. You'll need two of these

Would you still run diesel thru it? I think that's why they last so much longer than Fords.
 

2004LB7

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Would you still run diesel thru it? I think that's why they last so much longer than Fords.
Not if the diesel is hotter then the ambient air. Monitor the fuel temp and you'll see that it too is quite hot especially when running quarter tank or less.

Ideally you'd mount it down low inside the cab. But that would likely require a lot of wiring. And I'm not sure how that would change the impedance of the circuit for the injectors. Probably wouldn't be an issue but something to think about. Most will move it to the firewall, wheel well, or there abouts
 
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2004LB7

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Did a little more cleaning and poking around with the board. Bad news it's a four layer board with the 1st, 2nd & 3rd layers burned pretty badly. Bottom layer looks fine but the charing between the layers will short them out due to the high carbon. And there is no way to know what the traces where under the top layer without the design layout.

From the looks of it, it almost looks like the high voltage injector traces run in that vicinity through one of the inner traces and maybe it arced to the capacitor and blew it up.

If only we could get ahold of someone on the inside that can find the drawings. But if we got that far then making a new board would be the way to go. Even if it required moving the chips over

I'll play around with it a little more but I don't have high hopes for this one