Troubleshooting - Yamaha XV1600A1999 Service Manual

EAS00821

TROUBLESHOOTING

The carburetor heating system fails to op-
erate.
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:
S Before troubleshooting, remove the following
part(-s).
1) rider seat
2) fuel tank
3) carburetor
4) left side cover
S Troubleshoot with the following special
tool(-s).
Pocket tester
90890-03112
EAS00738
1. Main and carburetor heater fuses
S Check the main and carburetor heater fuses
for continuity.
Refer to "CHECKING THE FUSES" in chap-
ter 3.
S Are the main and carburetor heater fuses
OK?
YES
CARBURETOR HEATING SYSTEM
NO
Replace the fuse(-s).
EAS00739
2. Battery
S 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
S Is the battery OK?
YES
EAS00749
3. Main switch
S Check the main switch for continuity.
Refer to "CHECKING THE SWITCHES".
S Is the main switch OK?
YES
EAS00823
4. Thermo switch
S Remove the thermo switch from the plastic
bracket.
S Connect the pocket tester to the thermo
switch coupler as shown.
Tester positive lead ! black
Tester negative lead ! black
S Immerse the thermo switch in a container
filled with water
S Place a thermometer
S Slowly heat the water, than let it cool to the
specified temperature as indicated in the
table.
S Check the thermo switch for continuity at the
temperatures indicated in the table.
7-51
ELEC
NO
S Clean the battery
terminals.
S Recharge
or
place the battery.
NO
Replace the main
switch.
1
2
.
3
in the water.
4
E
re-