Troubleshooting - Yamaha WR450FN 2022 Owner's Service Manual

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TROUBLESHOOTING

• The ignition system fails to operate (no spark or intermittent spark).
TIP
Before troubleshooting, remove the following part(s):
1. Side cover (left/right)
2. Seat
3. Fuel tank
4. Air scoop (left/right)
5. Air filter case cover
1. Check the ignition system wire har-
ness connections.
OK
2. Check the fuse(s).
Refer to "CHECKING THE FUSES"
on page 8-59.
OK
3. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-60.
OK
4. Check the spark plug.
Refer to "CHECKING THE SPARK
PLUG" on page 3-13.
OK
5. Check the ignition spark gap.
Refer to "CHECKING THE IGNI-
TION SPARK GAP" on page 8-65.
NG
6. Check the ignition coil.
Refer to "CHECKING THE IGNI-
TION COIL" on page 8-65.
OK
7. Check the engine stop switch.
Refer to "CHECKING THE
SWITCHES" on page 8-57.
OK
8. Check the crankshaft position sen-
sor.
Refer to "CHECKING THE CRANK-
SHAFT POSITION SENSOR" on
page 8-66.
OK
Reconnect.
NG
Replace the fuse(s).
NG
• Clean the battery terminals.
• Recharge or replace the battery.
NG
Correct or replace the spark plug.
NG
The ignition system circuit is OK.
OK
Replace the ignition coil.
NG
Replace the engine stop switch.
NG
Replace the crankshaft position sensor.
NG
8-3
IGNITION SYSTEM