Start with the basics. Is the PCM even alive?
Turn the key on but do NOT crank. Does the check engine light come on? IF not, suspect that the PCM is not even alive.
Does the theft light go out after a 3 second "prove out"? If yes, this means that the key has been accepted and PATS is authorized. Soooooooooooo any problem would NOT be PATS related.
Does the check engine light go out during cranking? IF yes, this means the PCM is receiving a CKP signal.
IMO it's silly to start the hard diagnosis on the fuel pump driver module until some of the basic items have been verified.
2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.