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FICM Voltage Test Results Question?
I am having a pretty serious cold start issue with my '05 6.0L at temperatures below about 40F. I have measured the fuel pressure which appears fine. I've checked the Glow Plugs and they appear to all be working. The truck has the lattest flash.
I tested my FICM voltage and see the following behavior (had truck on battery charger during test):
1) Key on FICM Voltage: 24V for 3 seconds (approx) and then it jumps up the 48.5V
2) Key on and crank immediately: 48.5V
- NOTE: I see the 24V reading for that second until until I start cranking the engine and then it immediately jumps up to 48.5V
- NOTE: I tested both with and w/o my Glow Plug Control Module powered but did not see any difference in behavior.
Can anybody tell me what is happening during those first three seconds as related to FICM voltage?