2008 Polaris Sportsman 500 EFI/X2/Touring/500 H.O. Service Manual, Page 343Get this manual
ELECTRICAL Coolant Temperature Sensor
The coolant temperature sensor can be tested using an ohmmeter or voltmeterIf the ECT circuit is open the engine Hot light and fan will both come onWith engine at an ambient temperature of 68 (20 C), disconnect lead and measure the resistance of sensor between the two ECT terminals and compare to the specification listed1With the engine and temperature sensor at room temperature (6820 C), disconnect the harness connectorWith the meter in the ohms mode, place the meter leads onto the sensor contactsUse the TemperatureResistance table to determine if the sensor needs to be replacedHigh Range Low Range Neutral Reverse Park GreenWhite BrownRed Violet (purple) WhiteBlue OrangeRed BlueRed