Engine Speed Control - Yamaha F150A Service Manual

Engine speed control

The engine ECM decreases the engine speed to protect the engine from damage and to improve
the smoothness of gear shifting.
Control
Criteria
name
When engine speed
is more than a
predetermined level
(F150A, FL150A)
Over-
revving
control
When engine speed
is more than a
predetermined level
(F150B, FL150B)
Multi-
engine Multi-engine system
system switch is ON
control
Shift cut- Shift cut-off switch is
off ON, engine speed is
control 400–2000 r/min
Over-
The thermoswitch is
heat
ON
control
The pressure
Low oil decreases to less
pressure than 272 kPa
control (2.72 kgf/cm
39.4 psi).
6200–6301 r/min
6302–6551 r/min
Over 6551 r/min
5751–5852 r/min
5853–6102 r/min
Over 6102 r/min
When using dual outboard
motors with a dual switch
panel, if the overheat control
or low oil pressure control is
activated, then these are to
be activated in the same way
for the other outboard motor
that is operating normally.
This allows smooth engagement and disengagement of the
dog clutch.
400–729 r/min
730–1999 r/min
No determination on overheat
will be made until the engine
speed is more than 2000
r/min for 29 seconds or more
after the engine has started,
or until 74 seconds after the
engine has started.
Fuel injection will be skipped in stages to limit engine speed to
approximately 2000–3500 r/min.
The low oil pressure alert comes on, and the alert buzzer
2 ,
sounds.
Description
2-5
Electronic control system
Fuel injection will be skipped
for cylinders #1 and #4.
Fuel injection will be skipped
for cylinders #1, #4 and #3.
Fuel injection for all cylinders
will be skipped.
Fuel injection will be skipped
for cylinders #1 and #4.
Fuel injection will be skipped
for cylinders #1, #4 and #3.
Fuel injection for all cylinders
will be skipped.
Fuel injection will be skipped
in stages to limit engine
speed to approximately
2000–3500 r/min.
Retards ignition timing.
After firing will be skipped for
cylinders #1 and #4, retards
ignition timing.
Fuel injection will be skipped
in stages to limit engine
speed to approximately
2000–3500 r/min.
The overheat alert indicator
comes on, and the alert
buzzer sounds.