Page 347 - Manual Oficina Polaris Sportsman 570 2014 a 2016

FUEL SYSTEM

CRANKSHAFT POSITION SENSOR

CPS - 325 CPS OVERVIEW

4

Mounted on top of the stator cover, the crankshaft
CPS - 570 position sensor q is essential to engine operation,
constantly monitoring the rotational speed (RPM) and
position of the crankshaft.

A ferromagnetic 35-tooth encoder ring w with a missing
tooth is built onto the flywheel. The inductive speed
sensor is mounted 1.0 ± 0.26 mm (0.059 ± 0.010″) away
from the encoder ring. During rotation, an AC pulse is
created within the sensor for each passing tooth. The
ECU calculates engine speed from the time interval
between the consecutive pulses.
The encoder ring missing tooth creates an “interrupt”
input signal, corresponding to specific crankshaft
position. This signal serves as a reference for the control
of ignition timing by the ECU. Synchronization of the
CPS and crankshaft position takes place during 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.

9926803 R06 - 2014-2016 Sportsman 325 / ETX / 450 HO / 570 Service Manual 4.31
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