2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 84Get this manual
EFIIgnition Systems Ambient Pressure Sensor Circuit (FST Only)
The ambient pressure sensor relays the absolute outside air pressure to the ECUThe ECU uses this information to determine the snowmobile's operating altitudeThe absolute outside pressure is also used by the ECU as function for several other operating parameters such as wastegate solenoid pulse valve controlAll three circuits that connect to the sensor are supplied and monitored by the ECUThe sensor is located on the air box facing the engineNOTE: Bosch PN 261 230 099 stamped on cover