2006 Honda TRX680 Rincon Factory Service Manual, Page 172Get this manual
FUEL SYSTEM (PGM-FI)
INSPECTION
The lACV is installed on the throttle body and is operated by the step motorWhen the ignition switch is turned ON, the lACV operates for few secondsCheck the step motor operating (beep) sound with the ignition switch turned ONNOTE: The lACV operation can be checked visually as following: Remove the lACV from the throttle body with its 4P (Black) connector in place, then turn the ignition switch ON