Yamaha MBK X-MAX 300 2017 Service Manual page 384

EAS30514
TROUBLESHOOTING
If the fuel pump fails to operate.
TIP
• Before troubleshooting, remove the following part(s):
1. Battery cover assembly
2. Front cowling assemblies
3. Lower side covers
4. Bottom cover assembly
5. Leg shield assembly
1. Check the fuses.
(Main, main 2 and backup)
Refer to "CHECKING THE FUS-
ES" on page 8-128.
OK ↓
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-128.
OK ↓
3. Check the main switch.
Refer to "CHECKING THE
SWITCHES" on page 8-127.
OK ↓
4. Check the start/engine stop switch.
Refer to "CHECKING THE
SWITCHES" on page 8-127.
OK ↓
5. Check the fuel pump relay.
Refer to "CHECKING THE RE-
LAYS" on page 8-129.
OK ↓
6. Check the fuel pump.
Refer to "CHECKING THE FUEL
PRESSURE" on page 7-7.
OK ↓
7. Check the entire fuel pump system
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-77.
OK ↓
Replace the ECU. Refer to "REPLAC-
ING THE ECU (Engine Control Unit)"
on page 8-128.
NG →
Replace the fuse(s).
NG →
• Clean the battery terminals.
• Recharge or replace the battery.
NG →
Replace the main switch.
NG →
The start/engine stop switch is faulty. Re-
place the right handlebar switch.
NG →
Replace the fuel pump relay.
NG →
Replace the fuel pump.
NG →
Properly connect or replace the wiring har-
ness.
8-79
FUEL PUMP SYSTEM