Yamaha YFZ450S 2003 Service Manual page 360

2. Thermo switch 2
• Remove the thermo switch 2 from the radi-
ator.
• Connect the pocket tester (Ω × 1) to the
thermo switch 2 1 as shown.
• Immerse the thermo switch 2 in a con-
tainer filled with coolant 2.
• Place a thermometer 3 in the coolant.
• Slowly heat the coolant, then let it cool
down to the specified temperature.
• Check the thermo switch 2 for continuity at
the temperatures indicated below.
Coolant temperature Continu-
Test step
Thermo switch
Less than 120 ± 3 °C
1
(248 ± 5.4 °F)
More than 120 ± 3 °C
2
(248 ± 5.4 °F)
More than 115 ± 3 °C
3*
(239 ± 5.4 °F)
Less than 115 ± 3 °C
4*
(239 ± 5.4 °F)
Steps 1 & 2: Heating phase
Steps 3* & 4*: Cooling phase
SIGNAL SYSTEM
È The thermo switch circuit is open and the cool-
ant temperature warning light is off.
É The thermo switch circuit is closed and the
coolant temperature warning light is on.
WARNING
ity
_
• Handle the thermo switch with special
care.
NO
• Never subject the thermo switch to
strong shocks. If the thermo switch is
YES
dropped, replace it.
YES
NO
• Does the thermo switch 2 operate properly
as described above?
8 - 37
ELEC
É
È
115 ± 3 ˚C 120 ± 3 ˚C
(239 ± 5.4 ˚F) (248 ± 5.4 ˚F)
Thermo switch
28 Nm (2.8 m · kg, 20 ft · lb)
YES
Replace the thermo
switch 2.
– +
NO