2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 88Get this manual
EFIIgnition Systems Crank Position Sensor (CPS) Circuit
The crank position sensor (CPS) is an AC signal generator that tells the ECU how fast the crankshaft is rotating and when the crankshaft is at TDC-MAG cylinderThe sensor is located on the intake-side of the engine, next to the gear cover housing