2005-2007 Polaris Ranger 500 service manual, Page 135Get this manual
ELECTRONIC FUEL INJECTION ELECTRONIC FUEL INJECTION
General Information
The Electronic Fuel Injection (EFI) system is complete engine fuel and ignition management designThis system contains the following principal components: Fuel Pump Fuel Rail Fuel Line(s) Fuel Filter(s) Fuel Injector Pressure Regulator Throttle Bodylntake Manifold Engine Control Module (ECM) Ignition Coils Engine Coolant Temperature Sensor (ECT) Throttle Position Sensor (TPS) Crankshaft Position Sensor (CPS) Manifold Absolute Pressure Sensor (MAP) Idle Air Control (IAC) Intake Air Temperature Sensor (IAT) Wire Harness Assembly Check Engine Light (MIL) The ECM controls the amount of fuel being injected and the ignition timing by monitoring the primary sensor signals for air temperature, manifold absolute pressure, engine temperature, engine speed (RPM), and throttle position (load)These primary signals are compared to the programming in the ECM computer chip, and the ECM adjusts the fuel delivery and ignition timing to match the valuesDuring operation the ECM has the ability to re-adjust temporarily, providing compensation for changes in overall engine condition and operating environment, so it will be able to maintain the ideal airfuel ratioDuring certain operating periods such as cold starts, warm up, acceleration, etc richer airfuel ratio is automatically calculated by the ECM