CRANKSHAFT POSITION SENSOR (CPS)
Mounted on top of the stator cover, the crankshaft
is essential to engine operation,
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.
9925724 R01 - 2014-2015 RZR XP 1000 / RZR XP4 1000 Service Manual
© Copyright 2014 Polaris Industries Inc.
The CPS is a sealed, non-serviceable assembly. If fault
code diagnosis indicates a problem with this sensor, test
1. Locate the CPS harness connector above the
transmission on the RH side of the vehicle and
disconnect the harness.
2. Connect an ohmmeter between the CPS pin
terminals shown below. A resistance value of 1000Ω
± 10% at room temperature should be obtained.
CPS Resistance Specification:
1000Ω ± 10%
3. If the resistance is correct:
• Test the main harness circuit between the sensor
connector terminals and the corresponding pin
terminals at the ECU (see wiring diagram).
• Check the sensor mounting, air gap, flywheel
encoder ring for damage or runout, and flywheel
key. Follow the CPS Replacement procedure to
inspect CPS and flywheel encoder ring for
4. If the resistance is incorrect, follow the
Replacement, page 4.33 procedure.