Trouble Shooting - Yamaha WR450FB 2012 Owner's Service Manual

EAS1DX3226

TROUBLE SHOOTING

The fuel pump fails to operate.
TIP
Before troubleshooting, remove the following part(s):
1. Seat
2. Side cover (left/right)
3. Air scoop (left/right)
4. Fuel tank
1. Check the fuse.
Refer to "CHECKING THE FUSE"
on page 9-65.
OK
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 9-66.
OK
3. Check the main switch.
Refer to "CHECKING THE
SWITCHES" on page 9-60.
OK
4. Check the engine stop switch.
Refer to "CHECKING THE
SWITCHES" on page 9-60.
OK
5. Check fuel pressure.
Refer to "CHECKING THE FUEL
PRESSURE" on page 8-5.
OK
6. Check the fuel pump system wire
harness connections.
Refer to "CIRCUIT DIAGRAM" on
page 9-52.
OK
Replace the ECU.
FUEL PUMP SYSTEM
NG
Replace the fuse.
NG
• Clean the battery terminals.
• Recharge or replace the battery.
NG
Replace the main switch.
NG
Replace the engine stop switch.
NG
Replace the fuel pump.
NG
Properly connect or repair the fuel pump
system's wiring.
9-54