Mopar Electronic Pickup Polarity and Rotor Phase

The signal generation is due to change in flux with time, not position. When reluctor is still, flux is constant, signal is zero. Flux value is different with position. The proximity of tooth to nub, reduces flux, the event of passing increases, hence positive. Rotation direction changes trailing edge, not signal appearance.

At cranking signal level is low, only a volt or two with AC meter. At high RPM signal can increase to 60 V or more.

My favorite timing sensors are optical, they provide static signal, zero speed, and have excellent noise Immunity. They also provide a logic ready signal without detection circuit. The lower trigger trace was generated using ncv1124 variable reluctance interface. NCV1124: Comparator, Dual, Variable-Reluctance Sensor Interface