Polaris 2012 RANGER RZR 570 INTL User Manual

4.15
ELECTRONIC FUEL INJECTION
4
9923523 - 2012 RANGER RZR 570 Service Manual
© Copyright 2011 Polaris Sales Inc.
4. If the resistance is correct:
• Test the ma in harness circuit between the sensor
co
nnector 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 runout, 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
an
d remove the sensor from the stator cover.
3. Install new sensor using a lig
ht 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
e
quipped) to specification.
FUEL INJECTORS
Operation 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
th
e 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
de
termined 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.
= T
CPS Retaining Bolt Torque:
9 ft. lbs. (12 Nm)
Fuel Rail
Fuel Injector

Polaris 2012 RANGER RZR 570 INTL Specifications

General

Brand	Polaris
Model	2012 RANGER RZR 570 INTL
Category	Offroad Vehicle
Language	English