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4.12
ELECTRONIC FUEL INJECTION
9923142 - 2011 RANGER RZR / RZR S / RZR 4 Service Manual
© Copyright 2010 Polaris Sales Inc.
7. Install the sensor by inserting it with a twisting motion to
properly seat the grommet.
8. Install the retaining bolt and torque to specification.
CRANKSHAFT POSITION SENSOR
(CPS)
Operation Overview
The crankshaft position sensor is essential to engine 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.
CPS Test
The CPS is a sealed, non-serviceable assembly. If fault code
diagnosis indicates a problem with this sensor, test as follows:
1. Disconnect CPS (3-wire) harness connector on the left-
hand side of the vehicle located below the transmission.
2. Connect an ohmmeter between the pin terminals leading
from the Yellow and White wires. A resistance value of
560 10% at room temperature should be obtained.
3. Measure between the pin terminal leading from the Black
wire and ground. A resistance value of 0 - 0.5 ± 10%
should be obtained.
= T
T-MAP Retaining Bolt Torque:
25 ± 2.5 in. lbs. (3 ± .3 Nm)
T-MAP
Intake Boot
Bolt
Torque to Specification
CPS
CPS Resistance Specification:
Yellow to White: 560 10%
Black to Ground: 0 - 0.5 10%
CPS
Connector
Yellow
Black
White
CPS Harness