at the COIL SIDE of fuel pump relay, with ignition switch on, there is positive voltage at terminal 1 of relay but at terminal 2 which is the "ground" side of the relay, there is no ground and the relay cannot close, hence no power to fuel pump.
traced the black/yellow "ground" wire back to the ECM, pulled code for MPFI which indicated EFI system was normal (5 long & 5 short blinks).
WHY WOULD ECM NOT ALLOW FUEL PUMP TO OPERATE WHEN (IT THINKS) SYSTEM IS NORMAL???
MUST I REPLACE ECM?