2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 144Get this manual
500 EFI FUEL SYSTEM 500 EFI TRACTOR SPEED CONTROL System Operation Overview Sportsman 500 EFI Tractor models are equipped
the throttle opens and engine RPM increases, the increase in vacuum opens the slide valve (E), allowing more air to be drawn
into the engineThe speed sensor signal (B) is monitored by the ECUWhen the speed sensor signal rises over 40 Kph (25 Mph),
the ECU triggers the solenoid valve (D) to open, allowing atmospheric pressure on top of the slide diaphragm (F)This drops
the slide valve (E) down to limit the amount of air entering the engineOnce the vehicle speed drops below 37-40 Kph (23-25
Mph), the solenoid valve (D) closes and the operation repeatsShould the vehicle speed reach 67 Kph (42 Mph), the check engine'