Troubleshooting - Yamaha MT-09 2021 Service Manual

EAS30514

TROUBLESHOOTING

If the fuel pump fails to operate.
TIP
• Before troubleshooting, remove the following part(s):
1. Rider seat
2. Fuel tank side cover
3. Fuel tank center cover
4. Fuel tank
1. Check the fuses.
(Main, ignition 1, backup 2, and
fuel injection system)
Refer to "CHECKING THE FUS-
ES" on page 8-55.
OK↓
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-56.
OK↓
3. Check the main switch.
Refer to "CHECKING THE
SWITCHES" on page 8-53.
OK↓
4. Check the stop/run/start switch.
Refer to "CHECKING THE
SWITCHES" on page 8-53.
OK↓
5. Check the relay unit (fuel pump re-
lay).
Refer to "CHECKING THE RE-
LAYS" on page 8-56.
OK↓
6. Check the fuel pump.
Refer to "CHECKING THE FUEL
PUMP OPERATION" on page 7-3.
OK↓
7. Check the entire fuel pump sys-
tem's wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-45.
OK↓
NG→ Replace the fuse(s).
• Clean the battery terminals.
NG→
• Recharge or replace the battery.
NG→ Replace the main switch/immobilizer unit.
NG→ Replace the handlebar switch (right).
NG→ Replace the relay unit.
NG→ Replace the fuel pump.
Properly connect or repair the fuel pump
NG→
system's wiring.
8-49
FUEL PUMP SYSTEM