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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
Do you need a wire diagram to test the wiring to and form the FPCM?
Is there a good ground to the FPCM?
Do you have a scope to see if there is a signal to the FPCM from the PCM?
Do you have a 5.4 or 6.8?
Here is the wire diagram. https://dl.dropboxusercontent.com/u/90220402/FPCM.pdf
Here is the PCM connector view. https://dl.dropboxusercontent.com/u/90220402/175B.png
The 2 wires to the PCM should not have continuity to each other nor to power or ground.
Here are the diag steps for the code you have. https://dl.dropboxusercontent.com/u/90220402/KB.pdf
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I can only tell which PCM connector it is by comparing the wire colors and pins. I highlighted the 2 pins in the diagram and the wire colors are in the first diagram. The fact it runs with the FPDM bypassed does not rule out this portion or function of the PCM to blame.
Full voltage results in high fuel pressure. Which makes the engine run rich. Eventual catalytic converter failure. Faster spark plug failure. Lower MPG.
Hello again Chris here,