2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 89Get this manual
EFIIgnition Systems Camshaft Phase Sensor Circuit
The camshaft phase sensor is Hall Effect type sensor that tells the ECU the position of the MAG-exhaust rocker armWith this information, the ECU knows the position of the camshaft and thus, which cylinder is on its compression strokeIf the sensor is damaged or inoperable, there 5050 chance of starting the engine each time the key is turned to startThe sensor is located on the exhaust-side of the valve cover over the MAG cylinder