Fuel Injector; Fuel Injector Overview; Fuel Injector Test - Polaris RANGER 500 2017 Service Manual

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FUEL INJECTOR

The fuel injector is mounted into the cylinder head, with

the fuel rail retaining it from the top end. O-rings on both

ends of the injector prevent external fuel leaks and also

insulate the injectors from heat and vibration.

When the key switch is on, the fuel rail is pressurized,

and the EFI relay provides voltage to the injectors.

During engine operation, the ECU completes the ground

circuit, energizing the injectors. The valve needle in each

injector is opened electromagnetically, and the pressure

in the fuel rail forces fuel down through the inside. The

"director plate" at the tip of the injector contains a series

of calibrated openings which directs the fuel into the

intake port in a cone-shaped spray pattern.

The amount of fuel injected is controlled by the ECU and

determined by the length of time the valve needle is held

open, also referred to as the "injection duration" or "pulse

width". It may vary in length depending on the speed and

load requirements of the engine.

9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual

The fuel injector is non-serviceable. If diagnosis indicates

a problem with the injector, test the resistance of the fuel

injector solenoid windings by measuring between the two

Fuel Injector Resistance Specification:

11.4 - 12.6 Ω

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