Polaris 2014 Sportsman 570 EF, Руководство по обслуживанию

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9924871 R03 - 2014 Polaris Sportsman® 570 EFI Service Manual
© Copyright 2013 Polaris Sales Inc.
CRANKSHAFT POSITION SENSOR (CPS)
Operation Overview
Mounted on top of the stator cover, the crankshaft
position
sensor 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.
CPS Test
The CPS is a sealed, non-serviceable assembly. If fault
code diagnosis indicates a problem with this sensor, test
as follows:
1. To acess the CPS sensor (1), remove the right side
panel and footwell.
2. Disconnect CPS harness connector(2).
3. Connect an ohmmeter between the CPS pin
terminals shown below. A resistance value of
1000 Ω
± 10% at room temperature should be obtained.
CPS Resistance Specification:
1000 Ω ± 10%
4. 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
damage.
5. If the resistance is incorrect, follow the “CPS
Replacement” procedure.
FUEL SYSTEM - GENERAL