2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 459Get this manual
LIGHTSMETERSSWITCHES
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
INSPECTION
Drain the coolant from the engine (page 6-5)Remove the air intake duct (page 6-10)Disconnect the connector and remove the engine coolant temperature (ECT) sensorCONNECTOR
ECT SENSOR Suspend the ECT sensor in pan of coolant (1:1 mixture) on an electric heating element and measure the resistance through the sensor as the coolant heats up Soak the ECT sensor in coolant up to its threads with at least 40 mm (1.57 in) from the bottom of the pan to the bottom of the ECT sensor Keep the temperature constant for minutes before testingA sudden change of temperature will result in incorrect readingsDo not let the thermometer or ECT sensor touch the panTemperature Resistance 80C (176F) 47 57 120C (248F) 14 18 ECT SENSOR THERMOMETER