Troubleshooting - Yamaha XVS250 2001 Service Manual

EAS00781

TROUBLESHOOTING

The carburetor heater fails to operate.
Check:
1. main, and carburetor heater fuses
2. battery
3. main switch
4. thermo switch
5. carburetor heater
6. wiring
(of the entire carburetor heater system)
NOTE:
D Before troubleshooting, remove the following
part(-s):
1) battery cover
2) rider's seat
3) fuel tank
4) steering head side covers
5) tool box cover
D Troubleshoot with the following special tool
(-s).
Pocket tester
90890-03112
EAS00738
1. Main, and carburetor heater fuses
D Check the main, and carburetor heater
fuses for continuity.
Refer to "CHECKING THE FUSES" in chap-
ter 3.
D Are the main, and carburetor heater fuses
OK?
YES
CARBURETOR HEATER SYSTEM
NO
Replace the fuse(-s).
EAS00739
2. Battery
D Check the condition of the battery.
Refer to "CHECKING AND CHARGING
THE BATTERY" in chapter 3.
Open-circuit voltage
12.8 V or more at 20_C
D Is the battery OK?
YES
EAS00749
3. Main switch
D Check the main switch for continuity.
Refer to "CHECKING THE SWITCHES".
D Is the main switch OK?
YES
4. Thermo switch
D Remove the thermo switch from the thermo
switch plate.
D Connect the pocket tester to the thermo
switch lead.
Tester (+) lead 
Tester (–) lead 
7-39
ELEC
NO
D Clean the battery
terminals.
D Recharge
or
place the battery.
NO
Replace the main
switch.
Brown/Yellow terminal
Black/Yellow terminal
re-
1
2