2004-2007 Honda Aquatrax ARX1200N3/T3/T3D Factory Service Manual, Page 82Get this manual
TECHNICAL FEATURES
IDLE AIR CONTROL VALVE (IACV)
The fast idle system is fully automatic and is controlled by stepper motorThe stepper motor controls engine idle speed by extending the control valve shaftFluctuation of the idle speed is controlled by varying the opening of the throttle valves
OPERATION
1When the engine oil temperature is low, the control valve shaft is extended by the stepper motorAt this time the throttle valves open and the engine speed increases2When the engine is running and the engine oil temperature rises, the control valve shaft retractsAt this time the throttle valves close and the engine speed gradually lowers, until idle speed is maintained