2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 154Get this manual
500 EFI FUEL SYSTEM To prevent engine over-speed and possible failure, an RPM-limiting feature is programmed into the ECUIf the maximum RPM limit (7000) is exceeded, the ECU will suppress the ignition signal or injection signalThis process repeats itself in rapid succession, limiting operation to the preset maximumSportsman 500 EFI RPM Limit: This EFI system utilizes methods "Hard" LimitIgnition suppression occurs when RPM peaks rapidly: High: 7000 RPM Returns: 6900 RPM "Soft" LimitInjector suppression occurs when RPM reaches peak gradually: High: 7000 RPM Returns: 6900 RPM RPM limits may vary slightly under operating conditions
ECU Service