2005 Impreza NA EJ25 recently replaced motor. So I have no RPM signal via scan tool and no codes. Checked CKP wiring and the sensor its self, all good. Back probed ECM connector and had signal there while cranking, but no signal out to ignition coil. Really lost and could use any helpful advice.

 

You may try starting it with starting fluid. I had a friend of mines FICM give out in Houston at 2K12 and we were able to get it started with starting fluid to get us back to corpus.

 

I wish it were that easy, but it has fuel just no spark. Im thinking its the ECM but I have never heard of an ECM going bad in just one area like that. It still communicates with my scan tool and has crank signal just not recognizing it.

 

If you have no codes, then try priming your fuel system. I'd guess yours is sucking air.

 

some connector is loose is my $0.02

Hope you get it going but as you figured out - it's ignition related