Crankshaft Position Sensor (Cps); Cps Overview; Cps Test; Resistance Test - Polaris ACE 900 2017 Service Manual

FUEL SYSTEM

CRANKSHAFT POSITION SENSOR (CPS)

CPS OVERVIEW

Mounted on top of the stator cover, the crankshaft
q
position sensor is essential to engine operation,
constantly monitoring the rotational speed (RPM) and
position of the crankshaft.
A ferromagnetic 35-tooth encoder ring
tooth is built onto the flywheel. The inductive speed
sensor is mounted 1.0 ± 0.26 mm (0.059 ± 0.010") 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.
4.32

CPS TEST

The CPS is a sealed, non-serviceable assembly. If fault
code diagnosis indicates a problem with this sensor

RESISTANCE TEST

1. Access the CPS connector.
2. Disconnect CPS from the main harness connector.
3. Measure the resistance between the CPS terminals
4. If the resistance is incorrect, follow the "CPS
5. If the resistance is correct, thoroughly inspect the
w
with a missing
6. If all electrical connections have been verified and
7. Disconnect the ECU connector. Check continuity from
8. If under one ohm on both wires, leave one meter lead
NOTICE
circuit, test as follows:
q
shown below using an ohmmeter. Verify the
resistance at room temperature is within specification.
CPS Resistance Specification:
1000 Ω ± 10%
Replacement" procedure.
relevant wiring connections and chassis harness. An
electrical component , connection, or harness issue
may persist.
problems persist, proceed to the next test.
one wire at the CPS connector to the other end of the
circuit at the ECU connector. It should have less than
one ohm of resistance. If more than one ohm, locate
the cause of high resistance and recheck.
on one CPS circuit wires with both connectors still
disconnected. Place the other lead on the battery
negative terminal. Check both wires in this matter.
They should both read OL, indicating no shorts to
ground.
9929422 R02 - 2017-2019 ACE 900 Service Manual
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