2004-2005 Honda TRX450R Factory Sevice Manual, Page 321Get this manual
ELECTRICAL
COOLANT TEMPERATURE INDICATOR
SYSTEM INSPECTION
Disconnect the engine coolant temperature (ECn sensor connector
Start the engine and check the indicator If the indicator lig ht fo seconds hen goes off,
go to next step If the nd icato ights and stays n, check for sho rt circuit in he fo llow ing ire:Yellowblue wi re betw een th ECT senso and ani nit io co nt ro module (l eM) con necto rsGray wire between he fanreM and indicator