2010 Polaris Sportsman 850 Service Manual, Page 64Get this manual
ELECTRONIC FUEL INJECTION 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 crankshaft3Connect an ohmmeter between the pin terminals as shownA resistance value of 860 10 at room temperature (20 C, 68 F) should be obtainedCPS Connector
CPS "Removed" 4A ferromagnetic 60-tooth ring gear with two consecutive teeth missing is mounted on the flywheelThe inductive speed sensor is mounted 1.0 0.26 mm (0.059 0.010 in away from the ring gearDuring rotation, an AC pulse is created within the sensor for each passing toothThe ECU calculates engine speed from the time interval between the consecutive pulsesThe two-tooth gap creates an "interrupt" input signal, corresponding to specific crankshaft positionThis signal serves as reference for the control of ignition timing by the ECUSynchronization of the CPS and crankshaft position takes place during the first two revolutions each time the engine is startedThis sensor must be properly connected at all timesIf the sensor fails or becomes disconnected for any reason, the engine will stop running