Compression Ignition Addict
Join Date: Jun 2011
Location: Colorado Springs
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A lot of failing FICMs will show 48V after the truck has been running a while (mine did). The true test is to check it 3 ways:
1) when dead cold - key on, engine off (KOEO), should be 48V
2) still dead cold, and engine cranking (should still be 48V)
3) when running, but still cold engine - should still be 48V
When mine was going dead, it would be at 48V at KOEO and then when I started it, it would drop down to 30 V or so, and then as the engine warmed up it would come up to 48V or so.
Gotta check it cold and when cranking - should always be 48V.
It's the easiest thing to check, and definitely a good possibility for cold start problems.
2005 F-250 6.0L, crew cab, long bed 4x4
completed in 2011: STC update, new IPR, BPD EGR cooler, oil cooler rebuild, 6.4 banjo bolts, blue spring update, SCT X3, Insight CTS, 58V FICM, CCV Mod, DIY coolant filter (now gone), refinished turbo
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2012: ARP headstuds, OEM gaskets, standpipes and dummy plugs
2015: XDP coolant filter