Crankshaft Position Sensor (Cps); Operation Overview; Cps Test - Polaris 2015 RZR 900 Service Manual

FUEL SYSTEM

CRANKSHAFT POSITION SENSOR (CPS)

Operation Overview

Mounted on top of the stator cover, the crankshaft
position sensor is essential to engine operation,
1
constantly monitoring the rotational speed (RPM) and
position of the crankshaft.
A ferromagnetic 35-tooth encoder ring with a missing
tooth is built onto the flywheel. The inductive speed
sensor is mounted 1.0 ± 0.26 mm (0.059 ± 0.010 in.)
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.
4.26

CPS Test

The CPS is a sealed, non-serviceable assembly. If fault
code diagnosis indicates a problem with this sensor, test
as follows:
1. Locate the CPS harness connector above the shift
cable on the right side of the vehicle and disconnect
the harness.
2. Connect an ohmmeter between the CPS pin
terminals
1000Ω ± 10% at room temperature should be
obtained.
9925723 R01 - 2015 RZR 900 Service Manual
© Copyright 2014 Polaris Industries Inc.
shown below. A resistance value of
1
CPS Resistance Specification:
1000Ω ± 10%