Quote Originally Posted by Leon R View Post
That is what I was thinking, but why would it fire the coils? Usually spark goes along with the fuel.
crankshaft sensor - sending rpm signal and TDC#1 to pcm - if no crank signal - no fuel pressure. also pcm fires coils up according crank signal. camshaft for injectors and better correlation etc...
But, with the key on-run pcm should send signal to fuel pump to prime fuel for a second or two.