4.14
ELECTRONIC FUEL INJECTION
9923523 - 2012 RANGER RZR 570 Service Manual
© Copyright 2011 Polaris Sales Inc.
CRANKSHAFT POSITION SENSOR (CPS)
Operation Overview
Mounted on top of the stator cover, the crankshaft position
sensor is es sential to engine op eration, co nstantly
monitoring the rotational speed (RPM) and position of the
crankshaft.
A ferromagnetic 35-tooth encoder ring with a missing tooth
is bu
ilt onto the flywheel. The inductive speed sensor is
mounted 1.0 ± 0.26 mm (0.059 ± 0.010 in.) away from the
encoder rin g. During ro tation, a n AC pu lse is cr eated
within the se nsor for each p assing to oth. Th e ECU
calculates en gine speed from the tim e interval be tween
the consecutive pulses.
The encoder ring missing tooth creates an “interrupt” input
sig
nal, corresponding to specific crankshaft position. This
signal serves as a r eference for the con trol of ig nition
timing by the ECU. Synch ronization o f the CPS a nd
crankshaft po sition t akes place d uring the first two
revolutions each time the engine is started. This sensor
must be properly connected at all times. If the sensor fails
or becomes disconnected for any reason, the engine will
stop running.
CPS Test
The CPS is a sealed, non-serviceable assembly. If fault
code diagnosis indicates a problem with this sensor, test
as follows:
1. The CPS is accessible through the r ight-hand r ear
wh
eel well area.
2. Disconnect CPS harness connector.
3. Connect an ohmmeter between the CPS pin terminals
sh
own below. A resistance value of 1000 Ohm ± 10%
at room temperature should be obtained.
CPS Resistance Specification:
1000 Ohms ± 10%
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