Troubleshooting - Yamaha YJ125S Service Manual

EAS00821

TROUBLESHOOTING

The carburetor heating system fails to
operate.
Check:
1. Main fuse
2. Battery
3. Main switch
4. Thermo switch
5. Carburetor heater
6. Wiring connections
(of the entire carburetor heating system)
NOTE:
8 Before troubleshooting, remove the follow-
ing part(s):
1. Head light cover
2. Front turn signal light bracket
3. Leg shield 1
4. Cover
5. Battery cover
6. Footrest board side cover mole(right)
8 Troubleshoot with the following special
tool(s).
Pocket tester
90890-03132 (YU-03112-C)
EAS00738
1. Main fuse
8Check the fuse for continuity.
Refer to "CHECKING THE FUSES" in
chapter 3.
8Is the fuse OK?
YES
CRABURETOR HEATING SYSTEM
NO
Replace the fuse.
EAS00739
2. Battery
8Check 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
8Is the battery OK?
YES
EAS00749
3. Main switch
8Check the main switch for continuity.
Refer to "CHECKING THE SWITCHES".
8Is the main switch OK?
YES
7-42
-
ELEC
NO
8Clean the battery termi-
nals.
8Recharge or replace the
battery.
NO
Replace the main switch.
+