Crankshaft Position Sensor (Cps); Operation Overview; Cps Service - Polaris Sportsman 850 Service Manual

FUEL SYSTEM

CRANKSHAFT POSITION SENSOR (CPS)

OPERATION OVERVIEW

The crankshaft position sensor
operation, constantly monitoring the rotational speed
(RPM) and position of the crankshaft.
A ferromagnetic 60-tooth ring gear with two consecutive
teeth missing is mounted on the flywheel. The inductive
speed sensor is mounted 1.0 ± 0.26 mm (0.059 ± 0.010
in.) away from the ring gear. 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 two-tooth gap
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.
4.30
r
is essential to engine

CPS SERVICE

1. Remove the intake/plenum. , page 3.25
2. To perform a static test on the CPS, disconnect the
CPS electrical connector. Set your digital multimeter
to Ohms, and test the resistance of the internal circuit
of the sensor. The wires in the harness that
correspond/match up with this circuit are the WHITE
(WH) and BLACK (BK) wires. The BROWN (BN) wire
is a shield.
Crankshaft Position Sensor:
860Ω ± 10% (20° C, 68° F)
3. If the sensor static resistance tests in spec, it could
still be dynamically failing (not producing a proper
output). First check for good (under 1 ohm) continuity
on all 3 CPS circuits and for no shorts to ground. If
those circuits check out, trying a known good sensor
even if the static resistance test passes is advisable.
4. If removing the sensor, torque the fastener to
specification.
TORQUE
CPS Retaining Bolt:
89 in. lbs (10 Nm)