Troubleshooting - Yamaha Wolverine YX70EPNG Service Manual

EBS30283

TROUBLESHOOTING

If the fuel pump fails to operate.
TIP
• Before troubleshooting, remove the following part(s):
1. Hood
2. Rear panel (right)
3. Under-seat storage compartment
1. Check the fuses.
(Main, fuel injection system, and ig-
nition)
Refer to "CHECKING THE FUS-
ES" on page 9-94.
OK ↓
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 9-95.
OK ↓
3. Check the main switch.
Refer to "CHECKING THE
SWITCHES" on page 9-89.
OK ↓
4. Check the fuel injection system re-
lay.
Refer to "CHECKING THE RE-
LAYS" on page 9-97.
OK ↓
5. Check the fuel pump.
Refer to "CHECKING THE FUEL
PUMP BODY" on page 7-2.
OK ↓
6. Check the entire fuel pump system
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 9-65.
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 →
Replace the fuel injection system relay.
NG →
Replace the fuel pump assembly.
NG →
Properly connect or replace the wire har-
ness.
9-67
FUEL PUMP SYSTEM