Checking The Thermo Switch - Yamaha YZF-R7 Owner's Service Manual

COOLING SYSTEM

CHECKING THE THERMO SWITCH

• Remove the thermo switch from the radia-
tor.
• Connect the pocket tester (
thermo switch 1 as shown.
• Immerse the thermo switch in a container
filled with coolant 2.
NOTE:
Make sure that the thermo switch terminals
do not get wet.
• Place a thermometer 3 in the coolant.
• Slowly heat the coolant, then let it cool to
the specified temperature as indicted in
the table.
• Check the thermo switch for continuity a
the temperatures indicated in the table.
Coolant temperature
Test step
1
More than 105
2
3*
4*
Less than 100 ˚C (212 ˚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.
• Does the thermo switch operate properly
as described above?
Yes OK.
No Replace.
8 - 26
ELEC
Thermo switch
0 ~ 100 3˚C
(0 ~ 212 37.4˚F)
3˚C
(221 37.4˚C)
105 to 100 ˚C
(221 to 212 ˚F)
®
10
– +
1) to the
Continuity
NO
YES
YES
NO