2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 68Get this manual
EFIIgnition Systems BOSCH M-MOTRONIC ELECTRONIC FUEL INJECTION
System Overview
The Bosch M-Motronic engine management system implements the engine's operational status in-line with the operator's demandsThe microprocessor responds to the operators' demands by translating the throttle flipper travel into specified engine outputThe operator controls the charge density via the throttle flipperThe Engine Control Unit (ECU) responds to the operator's throttle input by controlling and monitoring the density of each cylinders' air charges, the mass of injected fuel, and ignition timingIn order to accomplish these tasks, the ECU relies on the following sensors, actuators, and feedback systems: Throttle Position Sensor (TPS) Wide Band Lambda Sensor Turbo Boost Pressure Sensor (FST Only) Ambient Pressure Sensor (FST Only) Intake Manifold PressureTemperature Sensor Roll Over Sensor Engine Speed Sensor (CPS) Camshaft Phase Sensor Knock Sensor (FST Only) Coolant Temperature Sensor Idle Air Control Actuator (Stepper Motor) Vehicle Speed Sensor Battery Voltage Reverse Switch (PERC Button) FWDREV Chaincase Switches The ECU has direct control over the following components: Wastegate Solenoid (Pulse Valve) (FST Only) Wide Band Lambda Sensor Heater ElementPump Control Fuel Injectors Ignition Coils Relay Control (EFI, Fuel Pump, Intercooler Fan, Chassis, Ignition, Start) Idle Air Control Actuator (Stepper Motor) Never start the engine or let it run in an enclosed areaIf gasoline spills on your skin or clothing, immediately wash if off with soap and water and change clothingDo not overfill the gas tank or fill up to the filler neckDo not smoke or allow open flames or sparks in or near the area where refueling is performed or where gasoline is present MFI (Multi-Function Instrument) MIL (Malfunction Indicator Lamp)