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The FICM will cycle through the injector outputs when the key is placed in the ON position. This is called pre-cycleThe guide doesn't specify exactly what year models it covers, but maybe it's only 2003 - 2004 year models, since the back cover has June 2004 Revision 0. I don't know if and when the FICM changed. As I mentioned it a previous post, I'm a bit surprised the motorcraftservice.com site doesn't give more specifics regarding the FICM.
and the time of pre-cycle varies with engine temperature. The pre-cycle is done as a self test of the injector