2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 93Get this manual
EFIIgnition Systems Idle Air Control Actuator Circuit
The idle air control actuator (IAC) is stepper motor that varies the amount of air bypassed around the throttle plates when the engine is idlingThe IAC allows the ECU to compensate for changes in ambient temperature, altitude and engine temperatures without having to re-set the throttle plate gapThe IAC is located underneath the consoleTwo hoses attach to the throttle body, while one large hose connects to the airbox on the FSTFS models has two hoses attached to the throttle body with foam filter on the IAC inlet