is my Ficm alright? (vid) - Ford Powerstroke Diesel Forum
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  #1  
Old 06-17-2011, 12:58 AM
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is my Ficm alright? (vid)

right after i started it.
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Old 06-17-2011, 03:40 AM
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I think its when it drops below 46 volts that there's a problem. Mine does the same thing fluctuating between 48 an 49 volts.
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Old 06-17-2011, 04:48 AM
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mine will go from 47-48.5 and every now and then I will get a 46.5..This seems normal from all the reading ive been doing. Im not worried.......yet.......
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Old 06-17-2011, 04:49 AM
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Normal. Read it while cranking once where is it then
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Old 06-17-2011, 05:27 AM
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I sure hope so because mine looks exactly the same.
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Old 06-17-2011, 06:32 AM
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Watch what it reads when you "key on engine off", then while "cranking". The reading you showed is normal.
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Old 06-17-2011, 07:38 AM
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Perfectly normal, just like battery voltage fluctuations. In essence, the FICM multiplies the input voltage by 4, so if your battery voltage fluctuates a little bit, it will magnify that fluctuation by a factor of 4 on the output voltage of the FICM. If you see it start to drop by more than a few volts and your battery voltage is perfectly fine, you need to inspect the power supply on your FICM.
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Old 06-17-2011, 07:44 AM
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Quote:
Originally Posted by Evil Eye View Post
Perfectly normal, just like battery voltage fluctuations. In essence, the FICM multiplies the input voltage by 4, so if your battery voltage fluctuates a little bit, it will magnify that fluctuation by a factor of 4 on the output voltage of the FICM. If you see it start to drop by more than a few volts and your battery voltage is perfectly fine, you need to inspect the power supply on your FICM.
Well that there ia a great little nugget of info. The FICM will act like the canary in the mine shaft. When the batteries start to go south the FICMV will show it first. So if the voltage drops (too far) on both check the batteries. If the battery volts are good and the FICMV drops check the FICM.
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Old 06-17-2011, 07:57 AM
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That's it. It has a DC-to-DC power supply which is the part that predominantly fails.
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Old 06-17-2011, 08:33 AM
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Here is a video I just did using the Scangauge II. All 4 gauges are FICM readings.

Yes, my FICM is going south. You will notice the FMP drops too low. I wait to start now until FMP is at 48V. Not that it will matter as far as repairing, but, might try to wait out BPD's soon to be released FICM.

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