Yamaha YZF-R1 1998, Service Manual

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ELEC
COOLING SYSTEM
EB807400
YES
NO
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?
The wiring circuit
from the main
switch to the radia-
tor fan motor cou-
pler is faulty and
must be repaired.
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 .
• 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.
NOTE:
Make sure that the thermo switch termi-
nals do not get wet.
Test
step
Coolant temperature
Continuity
Thermo switch
1
0 ~ 98 ˚C
NO
2
More than 105
±
3 ˚C
YES
3*
105 to 98 ˚C
YES
4*
Less than 98 ˚C
NO
Test steps 1 & 2: Heating phase
Test steps 3* & 4*: Cooling phase
T
R
.
.
Thermo switch
23 Nm (2.3 m • kg)
Three bond sealock

10
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.
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.