Yamaha F150A Service Manual page 299

Lubrication system
Check the engine oil level.
At specified level?
Yes
Check the oil pressure.
Within specification?
Yes
Check the oil pressure sensor.
Good condition?
Yes
Check the ignition system or the
fuel system.
63P3F11
No
Add engine oil to the correct
level.
No
Check the oil pump for debris or
oil leaks.
Debris or leaks?
Yes
Clean or replace the defective
parts.
No
Replace the oil pressure sensor.
Power unit
No Check the oil
passage.
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