Troubleshooting - Yamaha XV16AL Service Manual

EAS00821

TROUBLESHOOTING

The carburetor heating system 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 heating system)
NOTE:
• Before troubleshooting, remove the fol-
lowing part(s).
1) rider seat
2) fuel tank
3) carburetor
4) left side cover
• Troubleshoot with the following special
tool(s).
Pocket tester
YU-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 HEATING SYSTEM
NO
Replace the fuse(s).
7 - 52
EAS00739
2.Battery
• Check the condition of the battery.
Refer to "CHECKING AND CHARGING
THE BATTERY" in chapter 3.
Minimum 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
EAS00823
4.Thermo switch
• Remove the thermo switch from the
plastic bracket.
• Connect the pocket tester to the thermo
switch coupler as shown.
Tester positive lead → black 1
Tester negative lead → black 2
• Immerse the thermo switch in a con-
tainer filled with water 3.
• Place a thermometer 4 in the water.
• Slowly heat the water, than 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.
– +
ELEC
NO
• Clean the battery
terminals.
• Recharge or
replace the battery.
NO
Replace the main
switch.
7