Yamaha F150A Service Manual page 300

TRBL
SHTG
Symptom 3: Engine speed not stable at low speeds.
Check the throttle position sen-
sor and check that the connec-
tor is securely connected.
Good condition?
Yes
Check the neutral switch for
continuity.
Is there continuity?
Yes
Check the throttle valve opening
of each cylinder.
Are the throttle
valve openings
incorrect or are
the throttle valve
links worn?
No
Check the ignition system or the
fuel system.
9-15
Troubleshooting
No
Repair or replace the defective
part.
No
Repair or replace the defective
parts.
Yes
Replace the throttle body.
63P3F11