2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 456Get this manual
LIGHTSMETERSSWITCHES Temperature indicator does not come on when the ignition switch is turned ON Disconnect the engine control module (ECM) 21P (Gray) and ECM 21P (Black) connectors and short the Bluered and Green wire terminals with jumper wireTurn the ignition switch ON and check the temperature indicatorIf the indicator does not come, check for open circuit in Bluered and Green wireIf the wires are normal, the combination meter is faulty'05, '06 shown: 21P (GRAY) CONNECTOR
Temperature indicator does not go off when the fan motor stops Remove the following: recoil starter cover (page 2-4) fuel tank cover (page 2-6) air intake duct (page 6-10) Disconnect the connector from the engine coolant temperature (ECT) sensor and check the temperature indicator with the ignition switch ONIf the indicator goes off, check the ECT sensor (page 22-20)CONNECTOR