No Start Question

[harrg67]

I have a no start condition and it appears the ECU won't send a relay release signal to the starter lock relay. So.. the question is what sensors/conditions will keep the ECU from letting the engine start?

I bypassed the fuel pump relay and I can hear the pump running. I inject 12V on the starter side of the starter lock relay and it will crank but not fire. When I do that, the tach shows ~500 rpm so I 'think' the crankshaft sensor is working.

Any help is appreciated!