Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
1994 infiniti g20 2.0 crank no start
spark ok, injector pulse ok, air entering to the engine ok, compression ok
fuel pressure checked before the injectors is 40psi.
what I don't see is fuel in the return hose coming out the injectors rail.
and cranking security light blinks....... what it could be......
I suspect security mode may have disabled the injectors. You could spray a fuel source into the intake to see if it tries to start to build on that theory. An injector balance test would certainly confirm no injector pulse. The next question would be why? I am not experienced with security issues, if that's what this is, but I'm sure others are.
What did you do to confirm injector pulse? A test light would work for that, or pulling a plug to find a stinking soaked plug after cranking with no start.
