Troubleshooting - Yamaha YZF-R125 Service Manual

YamahaR125.COM
EAS27570

TROUBLESHOOTING

If the fuel pump fails to operate.
NOTE:
• Before troubleshooting, remove the following part(s):
1. Rider seat
2. Fuel tank
1. Check the fuses.
(Main and ignition)
Refer to "CHECKING THE FUS-
ES" on page 8-63.
OK ↓
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-64.
OK ↓
3. Check the main switch.
Refer to "CHECKING THE
SWITCHES" on page 8-59.
OK ↓
4. Check the engine stop switch.
Refer to "CHECKING THE
SWITCHES" on page 8-59.
OK ↓
5. Check the fuel pump operation.
Refer to "CHECKING THE FUEL
PRESSURE" on page 7-2.
OK ↓
6. Check the entire fuel pump system
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-53.
OK ↓
Replace the ECU.
NG →
Replace the fuse(s).
NG →
• Refill battery fluid.
• Clean the battery terminals.
• Recharge or replace the battery.
NG →
Replace the main switch.
NG →
The engine stop switch is faulty. Replace
the right handlebar switch.
NG →
Replace the fuel tank (with fuel pump).
NG →
Properly connect or repair the fuel pump
system wiring.
8-55
FUEL PUMP SYSTEM