Have the wiring diagramming coming from the ECU and it shows:

1. Red - guessing constant
2. Blue - signal
3. Black - ground

Also assuming it is 5V coming from the ECU to pin 1 (search found 12V on a pin and 5V on other pin and ground but cannot found the website that listed it)?? Just not sure and cannot measure the harness pins.
Pins are labelled but still need to know the voltages coming from the ECU and if it is a pull down sensor design. Anyone measure the pins voltages from the ECU harness? Using it to do some testing.

Thanks for the help.

PS I bought the sensor for $4 including shipping. New.

 

I believe the crank position sensor is an inductor (a coil), there's two differential signal wires, no power. the ground is for the shield around the two signal wires. it produces a small AC current when the notches in the flywheel/flexiplate move past it.

 

I measured the resistance cannot remember the pins as i am out. But they neasured 180ohms. So it is not a hall effect sensor but an inductive sensor that produces an AC signal; hence the 180ohms.
I will test it and see if i get an AC voltage from by running a metal object in front of it.

 

Yeah, buy a good OEM sensor, a $4 one won't cut it! It's a crucial part, one of very few that will stop a Volvo!

 

It was $61 bucks and guessing on clearance. I bought it to test something.