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4. If the resistance is correct:
• Test the ma in harness circuit between the sensor
connector te rminals and the co rresponding pin
terminals at the ECU (see wiring diagram).
• Check th e sensor mou nting, air gap , flywh eel
encoder ring for da mage or ru nout, and flywheel
key. Follow the "CPS Replacement" procedure to
inspect CPS an
d flywh eel en coder r ing for
damage.
5. If th e re sistance is incorrect, follow the "CPS
Replacement" procedure.
CPS Replacement
1. If no t done already; disconnect the CPS ha rness
connector (see "CPS Test").
2. Using an 8mm socket, remove the CPS retaining bolt
and remove the sensor from the stator cover.
3. Install new sensor using a light coating of oil on the
O-ring to aid installation.
4. Torque the CPS an d he at sh ield r etaining b olts ( if
equipped) to specification.
CPS Retaining Bolt Torque:
9 ft. lbs. (12 Nm)
= T
9923523 - 2012 RANGER RZR 570 Service Manual
© Copyright 2011 Polaris Sales Inc.
ELECTRONIC FUEL INJECTION
FUEL INJECTORS
Operation Overview
The fuel injec tor is mounted into the cylinder head, w ith the
fuel rail retaining it fr om the top end.
of the injector prevent external fuel leaks and also insulate
the injectors from heat and vibration.
Fuel Rail
When the key switch is on, the fuel rail is pressurized, and
the EFI r elay pr ovides volt age to the in jectors. 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 th rough th e in side. T he "director
plate" at the tip
of the inje ctor contains a se ries 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.
O- r ings on b oth ends
Fuel Injector
4
4.15
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