1998-2004 Honda Foreman 450 factory service manual, Page 400Get this manual
LIGHTSMETERSSWITCHES Disconnect the cooling fan control unit 4P connectorCheck for continuity between the body ground and green of the wire harness side with the ignition witch offNo continuity Open circuit in ground wireCooling fan motor does not stopContinuity
, Faulty cooling fan contra unit
Disconnect the oil thermosensor connectorMotor does not stop
Motor stop
Faulty oil thermosensor
Connect the oil thermosensor connectorDisconnect the cooling fan control unit 2P connectorCheck for resistance between the Light blue wire terminal and ground of the wire harness sideStandard: 10 kQ (2S'C77' F) NOTE: Resistance will be lower at high engine temperature Normal
Abnormal
Short circuit of related terminal, Short circuit in Light blue or Blue wire Check the oil thermosensor (page 20-19
Disconnect the cooling fan control unit 4P connectorCheck voltage between the Black brown wire terminal and ground of the wire harness side with the ignition switch on Standard: Battery voltage Normal Disconnect the cooling fan control unit 2P connectorCheck voltage between the Pink re terminal and ground of the wire harness side with the ignition switch onStandard: Battery voltage Normal