2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 79Get this manual
EFIIgnition Systems Fuel Injection Circuit
The fuel injection circuit and fuel injectors are responsible for delivering fuel to each combustion chamberPower to each injector is supplied by the EFI relay and protected by 20A fuseThe ECU controls each injector by switching each circuit to groundThe time and duration the ECU grounds each circuit determines the injection timing and pulse widthNOTE: FS Fuel Injector ColorOrange FST Fuel Injector ColorBlack