CTS not reading FICM voltage correctly?

[ford rules]

So im looking at a truck for a friend and he has a edge CTS monitor his ficm volt reads around 30-40 when you first start it up after a little driveing it gets back up around 46-48.
The truck runs fine the entire time, no rough start/idle or anything like that. Could the CTS not be reading correctly.
Any ideas what i should check next, can i check voltage with my fluke meter and where would i do that?
Thanks Guys!!

 

[Dave]

CTS is reading correctly. FICM is shot

 

[dzldoctor]

Yep sometimes low batt voltage, otherwise ficm toast

 

[ford rules]

Forgot to add i load tested the batteries and checked the alt and its charging fine and the batteries are good.

Okay i will let him know figured the ficm was bad just wanted to double check, i thought they usually ran like crap when they had low voltage?

 

[loboost]

You can pop the small cover off the top & check voltage on the pins.

But go ahead and order a ficm or have it rebuilt lol

 

[ford rules]

Ill do that first just to make him happy, then let him decide what he wants to do to fix it.
Thanks again guys!!

 

[Blackie]

If the incoming ficm voltage is low ( the 13volt side ) the output will be low. Ficm could still be good.

Blackie

 

[Mdub707]

Agreed, the FICM could still be good. What's battery voltage doing when this is happening?