FICM Voltage - Ford Powerstroke Diesel Forum
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post #1 of 30 Old 08-24-2013, 08:53 PM Thread Starter
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FICM Voltage

I hate to sound like I'm beating a dead horse, but I haven't been able to find an answer to this particular question: How much is the voltage allowed to fluctuate while driving?

I recently did a DTC and found all 8 injectors showing contribution low. The truck ran GREAT on the 60 mile trip to get to where I was. Cleared the codes, hooked up to the sled, didn't pull so well (I think the error there was in the driver's seat). I rescanned it after the pull and saw 5 & 8 codes. Cleared them again and headed home.

On the way home I OCD observed fluctuations from 46.0v to 49v, hovering in the 47.0v to 48.5volts range. When I got home, the truck sat for about a week, hooked up the SCT and there were no codes.

BPD said that cruise voltage was less important than voltage when the motor is cold directly from the FICM post. Does anyone have any insight here? Am I being OCD? Is the FICM on it's way out? The last one ran fine, threw codes for all cylinders, got hard to start, then didn't start one day. Mike Wood (MDub707) said that my old FICM was a soup sandwich inside when he tcracked it open.

Any input would be appreciated. I'm about ready to just call BPD and put a beating on the VISA for a 6 Phase 54v FICM.

Karl

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post #2 of 30 Old 08-24-2013, 09:44 PM
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Well mine which is not a Bulletproof FICM actually no idea who worked it over but it only goes to 48.5-50.0 from cold to hot.
Hope that helps somehow

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post #3 of 30 Old 08-25-2013, 03:58 AM
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Mine will roam from 48.0-49.0 during all modes of driving hot or cold.


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post #4 of 30 Old 08-25-2013, 04:36 AM
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I'd say if its getting that low, it may be on its way out bro... I dont think it should drop past 47.5 when driving


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post #5 of 30 Old 08-25-2013, 06:29 AM
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don't worry him bro^ If it doesn't go below 45 he is fine..

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post #6 of 30 Old 08-25-2013, 06:42 AM Thread Starter
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Quote:
Originally Posted by 04cr450 View Post
don't worry him bro^ If it doesn't go below 45 he is fine..
This is what BPD said, however, how long is it between 46v and 44.9v? That's the question.

My last FICM would pop codes, I'd clear them and this went on for awhile. Then it finally puked. Luckily, it was in the front yard and I had the spare.

I still need to pop the cover and do a voltage check. Looks like that will have to wait till Tuesday. I'll report back then.

Thx for the inputs.

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Karl and his 2003 6.0

Barefoot Accelerator Pedal
TRICO Force wiper blades
Yellow Military Aircraft Valve Stem Caps
Offensive "Stick Family" Decal
Big Ol'Honkin 1 1/4" Shank Receiver Hitch


WHAT!?! I was trying to list stuff that everyone else
hasn't already listed for their truck!

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post #7 of 30 Old 08-25-2013, 07:05 AM
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mine also does that during idleing or driving. i have noticed it a few times dropping to 46.5v but hen goes back up to 47.5-48v fairly quickly. Doesnt seem to be any harder to start than usual. I guess i will see this winter once it gets cold here, but it usually doesnt get very cold in N. Georgia or Eastern Tennessee where i work. Crossing my fingers, but if it does go out then that just gives me an excuse to get a new one with ATLAS 40 from Bill. LOL.
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post #8 of 30 Old 08-25-2013, 09:04 AM
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^that is normal... You will see some fluctuation at the edge cts/cs then if you were measuring voltage AT the ficm connectors.. You would see a more stable voltage reading. If it goes below 45 volts at any time.. I would replace it.
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bpd
marty's regulated return
205/75 injects from holder's
WPE stage 3 ported intake
64.5 borg warner fmw ,compounds in the works now! Comp turbo set up
Warren comp trans
all the typical mods
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post #9 of 30 Old 08-25-2013, 10:27 AM
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Sounds like the FICM is on its way out. An FICM can show/test 48v and still be bad even tho voltage shows it being good. My reading from the edge CS will range from 48-49.5v

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post #10 of 30 Old 08-25-2013, 11:29 AM
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all 8 circuit low codes and you better get your ficm changed now. don't piss around or your truck is going to leave you stuck.

-Matt

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