Yamaha YZF-R1K Service Manual page 376

EB807400
5.Radiator fan motor (test 2)
• Disconnect the thermo switch coupler.
• Set the main switch to "ON".
• Connect the brown 1 and blue 2 termi-
nals with a jumper lead 3 as shown.
• Does the radiator fan motor turn?
YES
EB807402
6.Thermo switch
• Remove the thermo switch from the
radiator.
• Connect the pocket tester (Ω × 1) to the
thermo switch 1 as shown.
• Immerse the thermo switch in a con-
tainer filled with coolant 2.
NOTE:
Make sure that the thermo switch termi-
nals do not get wet.
• Place a thermometer 3 in the coolant.
• Slowly heat the coolant, then let it cool
to the specified temperature as indicated
in the table.
• Check the thermo switch for continuity
at the temperatures indicated in the
table.
NO
The wiring circuit
from the main
switch to the radia-
tor fan motor cou-
pler is faulty and
must be repaired.
8 - 47
COOLING SYSTEM
Coolant temperature
Test
step
Thermo switch
1
0 ~ 98 ˚C (0 ~ 208.4 ˚F)
More than 105 ± 3 ˚C
2
(221 ± 37.4 ˚ F)
105 to 98 ˚C
3*
(221 to 208.4 ˚ F)
4*
Less than 98 ˚C (208.4 ˚F)
Test steps 1 & 2: Heating phase
Test steps 3* & 4*: Cooling phase
WARNING
WARNING
• Handle the thermo switch with special
care.
• Never subject the thermo switch to
strong shocks. If the thermo switch is
dropped, replace it.
Thermo switch
23 Nm (2.3 m • kg, 17 ft • lb)
Three bond sealock
Å The thermo switch circuit is open and the
radiator fan is off.
ı The thermo switch circuit is closed and
the radiator fan is on.
– +
ELEC
Continuity
NO
YES
YES
NO
®
10
8