Another FICM voltage quesiton - Ford Powerstroke Diesel Forum
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Old 12-03-2011, 02:14 PM Fanatic

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Another FICM voltage quesiton

I have a Scangauge and one of the things I monitor is the FICM voltage. Generally I'm at 47-48.5, except at start up in the morning where it will start at 36 and quickly move up to 45, 46, 47, 48. This is only with the first start of the morning.

Today I turned the key to the "on" position (did not turn the truck on), then I turned on the Scangauge and I saw that it starts out at about 35, but quickly (over about 5-8 seconds) goes up to 47-48. THEN I turned on the truck.

Does anyone see a problem here? That's not a trick question.

Would it make sense to practice this starting procedure?

In other words, is it less stress on the FICM if I wait the 5-10 seconds for the voltage to go up BEFORE starting the truck?

Does it spare the FICM any stress?

Thanks guys
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Old 12-03-2011, 03:42 PM
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I would say this is a classic sign the FICM is going down hill. There are solder connections that crack out over time inside. As the FICM heats up during the initial injector pre cycle routine the connections may expand and develop less resistance. As long as the FICM is warm all is well.

Here is a link to give you more info:

There is a link to a great PDF in the thread that tells you all you could ever want to know about the FICM
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