Yamaha BT1100 2002 Service Manual page 341

EASB0039
TROUBLESHOOTING
The carburetor heater fails to operate.
Check:
1. Main, and carburetor heater
2. Battery
3. Main switch
4. Thermo
5. Carburetor heater
6. Wiring (of the entire charging system
NOTE:
• Before troubleshooting, remove the following
part(-s):
1) seat
2) side covers
3) fuel tank (lift)
4) storage compartment/battery cover
• Troubleshoot with the following special tool(-s).
Pocket tester
90890-03112
EAS00738
1. Main and carburetor heater fuses
• Check the main and carburetor heater fuses
for continuity.
Refer to "CHECKING THE FUSES" in
Chapter 3.
• Are the main, and carburetor heater fuses
OK?
YES
CARBURETOR HEATER SYSTEM
NO
Replace the fuse(-s).
7-47
EAS00739
2. Battery
• 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 (68 °F)
• Is the battery OK?
YES
EAS00749
3. Main switch
• Check the main switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the main switch OK?
YES
EASB0040
4. Thermo switch
• Remove the thermo switch from the thermo
switch plate.
• Connect the pocket tester to the thermo
switch lead.
Tester (+) lead
Brown/Yellow terminal 1
Tester (–) lead
Black/Yellow terminal 2
ELEC
NO
• Clean the battery ter-
minals.
• Recharge or replace
the battery.
NO
Replace the main
switch.