Troubleshooting - Yamaha YFM70RY Service Manual

EAS27570

TROUBLESHOOTING

If the fuel pump fails to operate.
TIP
• Before troubleshooting, remove the following part(s):
1. Seat
2. Fuel tank top panel
1. Check the fuses.
(Main, ignition and fuel injection
system)
Refer to "CHECKING THE FUS-
ES" on page 8-61.
OK ↓
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-62.
OK ↓
3. Check the main switch.
Refer to "CHECKING THE
SWITCHES" on page 8-57.
OK ↓
4. Check the engine stop switch.
Refer to "CHECKING THE
SWITCHES" on page 8-57.
OK ↓
5. Check the fuel pump relay.
Refer to "CHECKING THE RE-
LAYS" on page 8-65.
OK ↓
6. Check the fuel pump.
Refer to "CHECKING THE FUEL
PUMP BODY" on page 7-2.
OK ↓
7. Check the entire fuel pump system
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-51.
OK ↓
Replace the ECU.
NG →
Replace the fuse(s).
NG →
• Clean the battery terminals.
• Recharge or replace the battery.
NG →
Replace the main switch.
NG →
The engine stop switch is faulty. Replace
the handlebar switch.
NG →
Replace the relay unit.
NG →
Replace the fuel pump.
NG →
Properly connect or repair the fuel pump
system wiring.
8-53
FUEL PUMP SYSTEM