Crankshaft Position Sensor (Cps) - Polaris A12MH46AX Service Manual

500 EFI FUEL SYSTEM
CRANKSHAFT POSITION SENSOR
(CPS)
General Information
The engine speed sensor is essential to engine operation,
constantly monitoring the rotational speed (RPM) of the
crankshaft.
Interrupt
CPS
A ferromagnetic 36-1 ring gear is cast onto the flywheel.
The inductive crankshaft sensor is mounted 0.4 - 1.2 mm
(0.015 - .047 in.) away from this ring gear. During rotation,
an AC pulse is created within the sensor for each passing
tooth. The tooth gap creates an "interrupt" input signal,
corresponding to specific crankshaft position for PTO
cylinder. This signal serves as a reference for the control
of ignition timing by the ECU.
Crankshaft Position Sensor Air Gap:
0.4 - 1.2 mm (0.015 - .047 in.)
Within one (1) revolution at start-up, the ECU calculates
crankshaft position from the time interval between the
consecutive pulses. Synchronization of the CPS, ECU
and MAP sensor takes place during the first two (2)
revolutions each time the engine is started. Once the
engine is started, the ECU monitors the MAP sensor for
the engine intake stroke. The CPS must be properly
connected at all times. If the sensor fails or becomes
disconnected for any reason, the engine will quit
operating.
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9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
Crankshaft Position Sensor Test
The crankshaft position sensor is a sealed, non-
serviceable assembly. If fault code diagnosis indicates a
problem within this area, test and correct as follows:
1. Disconnect main harness connector from ECU.
2. Connect an ohmmeter between the pin terminals. A
resistance value of 185
°
temperature (20 C, 68
resistance is correct, check the mounting, air gap,
toothed ring gear (damage, runout, etc.), and flywheel
key.
Crankshaft Position Sensor Resistance:

185 ± 20% @ (20° C , 68° F)
3. Disconnect crankshaft sensor connector from wiring
harness. Test resistance between the terminals. A
reading of 185 ± 20% at room temperature (20
W
°
68 F) should again be obtained.
NOTE: If the resistance reading is incorrect, remove
the screws securing the sensor to the mounting
bracket and replace the sensor. If the resistance in
step 2 was incorrect, but the resistance of the
sensor alone was correct, test the main harness
circuit between the sensor connector terminals and
the corresponding pin terminals in the main
connector. Correct
reconnect the sensor, and perform step 2 again.
Crankshaft Position Sensor Replacement
1. Remove the RH footwell and rear body panel to gain
access to the recoil cover.
2. Disconnect sensor harness connector.
3. Using an 8 mm socket, remove the recoil cover
retaining bolts. A mallet or soft hammer may be
required to loosen the cover for removal.
4. Remove the retainer screws securing the sensor.
5. Install the new sensor, routing the harness wire
through the top of the case housing as was previously
installed.
± 20% at room
W
°
F) should be obtained. If
any observed problem,
°
C,