2006 Honda TRX680 Rincon Factory Service Manual, Page 54Get this manual
TECHNICAL FEATURES SHIFT CLUTCH HYDRAULIC CIRCUIT AND OPERATION This system activates the AT clutch PC solenoid valve, shift solenoid valve and as the PCM detects the following signals: throttle angle, vehicle speed sub-transmission gear position (D- Ft) drive mode (AUTOESP) engine oil temperature
It controls the shift clutches for the situation according to the combination of the respective solenoid valves operationGear in Neutral Gear position Neutral Clutch PC Solenoid ON Shift Solenoid OFF OFF 1st Shift Clutch 2nd 3rd -