Fuel Injector; Fuel Injector Overview; Fuel Injector Test; Fuel Injector Replacement - Polaris RANGER ETX 2015 Owner's Manual

FUEL INJECTOR

FUEL INJECTOR OVERVIEW

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 modulation". It may vary in length depending on the
speed and load requirements of the engine.
9926806 R03 - 2015 - 2016 RANGER ETX / 570 2-SEAT 2015 - 2016 RANGER 570 CREW Service Manual
© Copyright Polaris Industries Inc.

FUEL INJECTOR TEST

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
e
terminals :
Fuel Injector Resistance Specification:
11.4 - 12.6 Ω

FUEL INJECTOR REPLACEMENT

WARNING
Gasoline is extremely flammable and explosive under
certain conditions.
Always stop the engine and refuel outdoors or in a well
ventilated area.
Do not smoke or allow open flames or sparks in or near
the area where refueling is performed or where
gasoline is stored.
Do not overfill the tank. Do not fill the tank neck.
If you get gasoline in your eyes or if you swallow
gasoline, seek medical attention immediately. Do not
induce vomiting.
If you spill gasoline on your skin or clothing,
immediately wash it off with soap and water and
change clothing.
Never start the engine or let it run in an enclosed area.
Engine exhaust fumes are poisonous and can result
loss of consciousness or death in a short time.
Never drain the fuel when the engine is hot. Severe
burns may result.
Always wear safety goggles when working with high
pressure or flammable fluids. Failure to do so could
result in serious injury or complications.
FUEL SYSTEM
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