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The following video will give you a good overview of how various engine sensors work together to help provide spark and fuel to the engine to make it run.

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Comments about the video by SeanR, member of the AACA forum.

18X interrupter rings on Harmonic Balancer detected by crank position sensor:

3x interrupter rings on Harmonic Balancer detected by crankshaft position sensor:

18X and 3X interrupter rings:

Cam Position Sensor:

I wanted to write this out to show that when the engine wont start. We should troubleshoot here instead of to the cam sensor which is not required to get the engine to start and for high level explanation, is only used to trigger sequential fuel injection delivery mode.

Thanks to SeanR, member of the AACA Reatta forum, for this information and video.