Yamaha F50F Service Manual page 288

TRBL
SHTG
Is there continuity?
Yes
Check the resistance of each
ignition coil.
Good condition?
Yes
Check the resistance of each
spark plug wire and check the
spark plug caps for salt buildup.
Good condition?
Yes
Check the ECM output peak
voltage.
9-15
Troubleshooting
No
Replace the engine stop lan-
yard switch.
No
Replace the ignition coils.
No
Repair or replace the spark plug
wire.
6C13G11