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Yamaha YZ450F 2021 - Page 287

Yamaha YZ450F 2021
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IGNITION SYSTEM
8-4
The launch control indicator light fail to blink.
TIP
Before troubleshooting, remove the following part(s):
1. Seat
2. Air scoop (left)
9. Check the stator coil assembly.
Refer to “CHECKING THE STA-
TOR COIL” on page 8-50.
NG
Replace the stator coil assembly.
OK
10.Check the ignition system wire har-
ness.
Refer to “CIRCUIT DIAGRAM” on
page 8-1.
NG
Repair or replace the wire harness.
OK
Replace the ECU.
1. Check the launch control switch
coupler connections.
NG
Reconnect.
OK
2. Check the gear position switch cou-
pler connections.
NG
Reconnect.
OK
3. Check the launch control switch.
Refer to “CHECKING THE
SWITCHES” on page 8-43.
NG
Replace the launch control switch.
OK
4. Check the gear position switch.
Refer to “CHECKING THE GEAR
POSITION SWITCH” on page 8-53.
NG
Replace the gear position switch.
OK
5. Check the fuel ignition system wire
harness.
Refer to “CIRCUIT DIAGRAM” on
page 8-1.
NG
Repair or replace the wire harness.
OK
Replace the ECU.

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