Pulses and DC don't really go well in the same sentence

When the CPS connector is pointing forward, the upper pin is marked with + and the lower with -. The polarity is decides so based on teh sensor giving a positive voltage when iron is approaching the sensor tip and vise versa. With nothing moving, it's always going to show zero. Checking AC voltage while cranking is naturally always going to show "positive" and will not tell reverse connection.
Always check sensors from the other end of the loom, the EDIS connector in this case, to spot any faults in the connectors or wiring at the same time.