Yamaha XV1600A1999 Service Manual page 442

12 4_C
The thermo switch circuit is open.
A
The thermo switch circuit is closed.
B
Test step Water temperature
1 Less than 23
2 More than 23
3 More than 12
4 Less than 12
Test steps 1 & 2: Heating phase
Test steps 3 & 4: Cooling phase
CARBURETOR HEATING SYSTEM
23 3_C
Continu-
ity
3_C YES
3_C NO
4_C NO
4_C YES
7-52
WARNING
S Handle the thermo switch with special
care.
S Never subject the thermo switch to
strong shocks. If the thermo switch is
dropped, replace it.
S Does the thermo switch operate properly?
YES
5. Carburetor heater
S Remove the carburetor heater from the car-
buretor.
S Connect the pocket tester to the carburetor
heater as shown.
Tester positive probe !
carburetor heater terminal
Tester negative probe !
carburetor heater body
S Measure carburetor heater resistance.
Carburetor heater resistance
12 V 30 W: 6
S Is the carburetor heater OK?
YES
ELEC
NO
Replace the thermo
switch.
1
2
10 Ω at 20_C
NO
Replace the carbure-
tor heater.
E