Ficm problem? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 12 (permalink) Old 04-30-2011, 05:08 PM Thread Starter
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Ficm problem?

My 6.0 is running rough at idle. Ficm voltage is dropping from 48v to 42v then back up again. I swapped a good ficm to see if that was the problem but no change. Battery voltage is good and no loose wires that I can see. Is the PCM a problem or wiring harness? Any ideas would help.

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post #2 of 12 (permalink) Old 04-30-2011, 06:47 PM
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Re: Ficm problem?

I would be looking into not only loose , frayed wiring. Also my entire charging system. Starting with my grounds. That's kinda odd that a second ficm would do the same thing. Did you check ficm#2 while it was on the original truck? It's not uncommon for people to swapp a bad ficm for a bad ficm.

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post #3 of 12 (permalink) Old 04-30-2011, 07:43 PM
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Re: Ficm problem?

I just had a mechanic run a diagnostic on my 06' this morning. My FICM was showing ~50V and would drop a few volts, but not much. He said if the FICM was bad it would be dropping to ~30V. I would suspect a bad injector. When he had my truck plugged in he disabled one injector to show me what a bad injector would do and the truck ran really rough.

Also, if you swap your FICM don't you have to reflash all the modules to get them to recognize each other? I didn't think they were all plug and play.

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post #4 of 12 (permalink) Old 05-01-2011, 01:29 AM
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Re: Ficm problem?

FICM should NOT be below 46V. Also, they can be bad even when they show the proper voltage.

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post #5 of 12 (permalink) Old 05-01-2011, 07:07 PM
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Re: Ficm problem?

Speaking of voltage, what should the output voltage from the alternator be?

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post #6 of 12 (permalink) Old 05-01-2011, 07:44 PM
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Re: Ficm problem?

Below I have added to the list of Xgauges Fords specs for the FICM Xgauges.


KO=KEY ON LI=LOW IDLE HI=HIGH IDLE OR=OPERATING RANGE

FICM Vehicle Power (Volts) (Should be 12 Volts, should not drop below 10.25 for more than 60 seconds, or 9.0 for 4 seconds. TSB 09-24-03)

TXD: 07E02209CE

RXF: 0462450906CE

RXD: 3010

MTH: 006401000000

NAM: FVP

KO=12.0 LI=14.0 HI=14.0 OR=10.5-15.5


FICM Logic Power (Volts) (Should be 12 volts)

TXD: 07E02209CF

RXF: 0462450906CF

RXD: 3010

MTH: 006401000000

NAM: FLP

KO=12.0 LI=13.5 HI=13.5 OR=10.5-15.5

FICM Main Power (Volts) (Should be 47-48) Your FMP should never dip below 45. If it does, your FICM is toast and needs repaired or replaced.

TXD: 07E02209D0

RXF: 0462450906D0

RXD: 3010

MTH: 006401000000

NAM: FMP

KO=47 LI=47.5 HI=47.5 OR=40-52 (yes, that is what it says from Ford)
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post #7 of 12 (permalink) Old 05-02-2011, 03:52 AM Thread Starter
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Re: Ficm problem?

Thanks for the posts, I didn't think voltage was supposed to be below 47 but wasnt positive.

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post #8 of 12 (permalink) Old 05-02-2011, 03:00 PM
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Re: Ficm problem?

Quote:
Originally Posted by Komelika View Post
Also, if you swap your FICM don't you have to reflash all the modules to get them to recognize each other? I didn't think they were all plug and play.
No, you can use any year FICM on any truck. If you buy a brand new FICM from Ford, it needs to be flashed though, since it's "empty" new.

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post #9 of 12 (permalink) Old 05-02-2011, 08:37 PM
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Re: Ficm problem?

Quote:
Originally Posted by Mdub707 View Post
No, you can use any year FICM on any truck. If you buy a brand new FICM from Ford, it needs to be flashed though, since it's "empty" new.
Do you have to have it "flashed" in the truck or can it be off the truck? Cause if it has to be in the truck I have a major task ahead of me just getting my truck to ford. Another question would be can you just get the FICM rebuilt, or would it be smarter to just buy a new one?
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post #10 of 12 (permalink) Old 05-02-2011, 09:59 PM
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Re: Ficm problem?

Check swamps diesel they are great people and took care of me got me my FICM overnighted and it was a 58V.

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