2008 Polaris Ranger RZR Service Manual, Page 136Get this manual
ELECTRONIC FUEL INJECTION ENGINE COOLANT TEMPERATURE SENSOR (ECT)
Operation Overview
Mounted on the cylinder head, the engine temperature sensor measures coolant temperatureThe engine temperature sensor is Negative Temperature Coefficient (NTC) type sensor, as the temperature increases the resistance decreases
ECT Sensor Test
Engine Temperature Sensor To quickly rule out other components and wiring related to the ETS, disconnect the harness from the ETSThe fan should turn on and HOT' should indicate on the instrument clusterThis indicates all other components are working properlyRefer to Chapter 10 for ECT testingPolaris dealers can also test the sensor by using the Digital WrenchTM Diagnostic Software (dealer only)Refer to the Digital WrenchTM User Guide for more information
ECT Sensor Resistance Readings