is 45volts ficm output ok ? - Ford Powerstroke Diesel Forum
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Old 07-29-2011, 02:36 PM
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is 45volts ficm output ok ?

the dealership diesel tech thinks its ok. Everything I read it should be around 48volts ?

Last edited by walleyecat; 07-29-2011 at 04:24 PM.
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Old 07-31-2011, 06:47 PM
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I just started watching mine, and it stays at 48 for startup, and will vary while driving. I have see in drop to 45v but only for a second.
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Old 07-31-2011, 08:16 PM
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Lowest I have seen mine is 47.5 volts. According to some, I am in for doom and gloom. I would like to know what happens if it falls lower. What does it destroy?
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Old 07-31-2011, 08:22 PM
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45V-48V at all times is the Ford spec. Any lower and you'll need a new FICM.
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Old 08-01-2011, 03:12 PM
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at 45v keep your eye on it. my new ford ficm reads 48.50-49.00v all the time
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Old 08-01-2011, 04:33 PM
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thanks for the info, I just had a alternator go bad and the engine cut off. It's been in the shop now for 12 days . The tech is stumped, because the engine still has a random shut-off. He does'nt think the ficm is the problem,but other posts on here say after the alt. goes out, it can take out the ficm also. Not had any issues prior to the alt.

Last edited by walleyecat; 08-01-2011 at 04:45 PM.
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Old 08-01-2011, 05:48 PM
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may be a wire chafe issue
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Old 08-03-2011, 02:41 PM
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How do ya'll monitor the ficm output volts ? Does the edge insight show this ? If so, any recommendations on the best place to purchase one online ? thanks
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Old 08-03-2011, 02:42 PM
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Quote:
Originally Posted by walleyecat View Post
How do ya'll monitor the ficm output volts ? Does the edge insight show this ? If so, any recommendations on the best place to purchase one online ? thanks
I just bought a Insight CTS and it shows FICM voltage. The FICM voltage should hold steady no lower that 47V all the time, any lower and the power supply either needs to be replaced or repaired.
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Old 08-03-2011, 02:47 PM
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Here's a link to how to check it using a digital voltmeter.

LINK
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