2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 458Get this manual
LIGHTSMETERSSWITCHES If the motor does not start, remove the right front mud guard and right inner fender (page 2-9), and disconnect the fan motor 2P connectorMeasure the voltage between the harness side Blue wire terminal (+) and ground ()There should be battery voltage with the ignition switch ONIf there is no voltage, check for open circuit in Blue wireIf there is voltage, check for open circuit in Greenblack wire between the ECM and fan motorIf it is OK, the fan motor is faultyFAN MOTOR CONNECTOR
ENGINE OIL TEMPERATURE (EOT) SENSOR
INSPECTION
Remove the following: right front mud guard (page 2-8) right inner fender (page 2-9) Disconnect the connector and remove the engine oil temperature (EOT) sensorCONNECTOR
EOT SENSOR Suspend the EOT sensor in pan of engine oil on an electric heating element and measure the resistance through the sensor as the oil heats up