Yamaha YFM45FAR Service Manual page 381

3.If the coolant temperature warning light does not come on:
Check that the light comes on when the main switch is set to "ON".
G
Check that the light comes on when the coolant temperature is 120 ± 3 °C (248 ± 5.4 °F) or higher
G
and that the light remains on when the coolant temperature drops to 113 °C (235.4 °F).
1.Thermo switch 1
Remove the thermo switch 1 from the
G
cylinder head.
Connect the pocket tester (Ω × 1) to the
G
thermo switch 1 1.
Immerse the thermo switch 1 in coolant 2.
G
Check the thermo switch 1 for continuity.
G
While heating the coolant use a thermometer
3 to record the temperatures.
Coolant temperature
Test
step
Thermo switch 1
Less than 120 ± 3 °C
1
(248 ± 5.4 °F)
More than 120 ± 3 °C
2
(248 ± 5.4 °F)
More than 113 °C
3
(235.4 °F)
Less than 113 °C
4
(235.4 °F)
Test steps 1 & 2: Heating phase
Test steps 3 & 4: Cooling phase
È The thermo switch 1 circuit is open and the
coolant temperature warning light is off.
É The thermo switch 1 circuit is closed and the
coolant temperature warning light is come on.
WARNING
Handle the thermo switch 1 with special
care.
Never subject it to a strong shock or allow
it to be dropped. Should it be dropped, it
must be replaced.
Thermo switch 1:
8 Nm (0.8 m • kg, 5.8 ft • lb)
Three bond sealock
Replace the meter assembly.
Continuity
NO
YES
YES
NO
®
#10
GOOD
CONDITION
9 - 36
SIGNAL SYSTEM
113 ˚C
(235.4 ˚F)
BAD CONDITION
Replace the thermo switch 1.
– +
ELEC
É
È
120 ± 3 ˚C
(248 ± 5.4 ˚F)