Power Unit - Yamaha F150A Service Manual

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SHTG
NOTE:
• Before troubleshooting the outboard motor, check the compression pressure, the mounting and
rigging of the outboard motor, and the operation of the engine start switch. Also, make sure that
specified fuel has been used and that the battery is fully charged.
• To diagnose a mechanical malfunction, use the troubleshooting charts for each trouble located in
this chapter. Also, when checking and maintaining the outboard motor, see Chapters 3–8 for safe
maintenance procedures.
• To diagnose a sensor or switch malfunction, use the diagnostic flash indicator to determine the
cause.

Power unit

Symptom 1: Engine does not start, or starting the engine is difficult.
Starting system
Check the starter motor opera-
tion.
Good operating
condition?
No
Check the battery lead connec-
tions and the starter motor posi-
tive terminal for damage and
check that the ground lead bolt
is not loose or that it has not
come off. Check for blown
fuses.
Good condition?
Yes
Check the starter relay for conti-
nuity.
Continued on next page.
9-5
Troubleshooting
Yes
Check the ignition system and
fuel system.
No
Repair or replace the defective
parts.
9
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