1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 370Get this manual
LIGHTSMETERSSWITCHES Disconnect the coo ling fan control unit 4P 'connectorCheck for continlJity between the Body ground and green of the wire harness side with the ignition witch OFFNo continuity
Continuity
c Faulty cooling fanontrol unit
Open circu it in gro und wireCooling fan motot does not stopDisco,nnect the oilthermooensor commctOf,t
Motor stop
: }lp Faulty oilthermosensor
Motor does not stop
Connect the oil tMermosensor COnnec'
torDisconnect the cooling fan control unit
Abllormal
Short circuit of related terminal Snort ci rc uit in light blue Or BI'ue wire
Check for resistance between the light blua wire terminal and ground of the re harness s,ideStandard: 10 len (25,'CI77'Fl NOTE: ReSistance will be lower at high engi Helem per atIJ re Normal
Check the oil thermosenso (page 20-16)
DJsconnect the COOling f,an control unit Abnormaf 4P' connectort-.J Loose or poor contact.of related termi nal Open short circuit In Black!Brown wire_ Checl vortage between tile Black} Brown wire term in al and ground of the wire harness Side with the ignition