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Old 04-13-2017, 12:22 PM   #1
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Join Date: Feb 2009
Location: Seattle
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FICM question

Since I got a Scan gauge for The Van it allows me to obsess over more things while I drive. Monitoring the voltage of the FICM, it doesn't get up to 48.5 volts until the EOT gets to 190 degrees. The voltage floats between a low of 43 and high of 48.5. Once The Van gets up to operating temp, after about 10 miles, the FICM shows a constant 46.5 to 48.5 volts. The Van runs great, starts right up when cold, and after 80k miles I've had no issues, but should I be concerned about the short term low FICM voltage?


2005 SMB RB 50 4X4 w/ a 6.0 PSD
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Old 04-13-2017, 06:31 PM   #2
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That's not normal. FICM voltage should always be above 45v. Lot's of possible causes, pretty widely covered if you google search "low ficm voltage".

2006 E350 6.0PSD 5R110, SMB 4X4, RB-50, ARB lockers front/rear, Aluminess galore, AMP steps.
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Old 04-13-2017, 09:32 PM   #3
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mine stays up at 47.5 to 48.5 but only has 23k on it so far.
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