Cam sensor is auto part and very robast designed for hush envieroment and may be bot anyware. Fully static operation in defference of variable reluctance crank senosr or ABS whil sensors.
Nice animation of cam sensor and datasheet -
http://www.melexis.com/Assets/Hall_E...sor__3721.aspx
When any steel part is near of tip of cam sensor it pull to GND his out.