Starting to worry about my new FICM... - Ford Powerstroke Diesel Forum
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Old 01-29-2014, 08:51 PM
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Starting to worry about my new FICM...

So I got a new FICM from Ed @ ficmrepair.com. Nothing to fancy, just a new ficm with the "ultimate" warranty and the Eco-Tune in November 2013 of last year. I haven't really been to concerned about the FMP readings (Ed's reputation) but when I saw the Scanguage readings today I started to worry. Now granted, here in Indiana it's damn cold (today is the first day it hit 29 degrees in about a week). With that said, I was driving home today (about an hour drive), when I looked down at my guage and the FMP voltage was going up and down like crazy. At a stop light or stop sign, it reads 48-48.5 volts. When I hit the throttle, whether it was slowly or a kick to clean out the turbo (traffic jam), the FMP dropped to 46.5 volts at one time, then repeatedly hit as low as 46.5-47 volts on other occasions. The truck has new Interstate batteries and a 130 amp alternator that according to the Scanguage2 is running anywhere from 13.6/8 at idle to 13.8/14.0 while driving. Should I be worried or what is the actual difference in FMP voltage reading s that I should be getting used to? My fear is that at 46.5 volts, I am getting close to the "fall below 46 volts" everyone talks about.
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Old 01-29-2014, 09:19 PM
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Thats perfectly normal. Its 45v you cant drop below. Although 29 isnt that cold by any means.

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Old 01-30-2014, 04:03 PM
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I wouldn't worry too much about an occasional spike or dip. Now if it begins to happen often that is a horse of a different color.
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