Yamaha F80B Service Manual page 233

Lubrication system
Check the engine oil level.
At specified
level?
Yes
Check the oil pressure. (5-3)
Within
specification?
Yes
Check the oil pressure switch.
(8-9)
Good condition?
Yes
Check the engine using the
Yamaha Diagnostic System.
6D93G11
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 switch.
Power unit
No Check the oil
passage.
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5
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7
8
9
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