is 45volts ficm output ok ?

[walleyecat]

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

[ralderman]

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.

[Tennesseepowerstroke]

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?

[SickStroke6.0]

45V-48V at all times is the Ford spec. Any lower and you'll need a new FICM.

[sinner6.0L]

at 45v keep your eye on it. my new ford ficm reads 48.50-49.00v all the time

[walleyecat]

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.

[sinner6.0L]

may be a wire chafe issue

[walleyecat]

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

[a2elvis]

Originally Posted by walleyecat

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.

[Evil Eye]

Here's a link to how to check it using a digital voltmeter.

LINK