The M3 crank sensors are inductive -- no Hall sensor but a simple inductive coil/magnet inside to generate the pulses when the tooth wheel passing by. I would think these sensors are superior than the non-M Hall sensors which became bad just like cam sensor with time.
It's great the the M3 engineers chose to use inductive for this sensor instead of the cheap Hall sensor.
When moving a screwdriver across the sensor tip fast, it generates about couple volts AC (sinusoidal) between pin1 and pin2. pin3 is not connect internally but it serves as a EMI shield to protect the weak generated signal.
It's great the the M3 engineers chose to use inductive for this sensor instead of the cheap Hall sensor.
When moving a screwdriver across the sensor tip fast, it generates about couple volts AC (sinusoidal) between pin1 and pin2. pin3 is not connect internally but it serves as a EMI shield to protect the weak generated signal.