Warning Control - Yamaha F150A Service Manual

GEN
INFO

Warning control

This outboard motor is equipped with warning control functions to avoid serious engine damage.
The engine speed is limited to approximately 2,000 r/min if the engine overheats, if the oil pressure
is low, or if a dual engine system (DES) is operated.
When a switch turns on, the engine speed is controlled as shown in the table.
Engine
Thermo-
temperature
switch
sensor
130 °C
(266 °F) or
On higher
(0.63 V or
lower)
Overheat warning
indicator lights and
buzzer sounds
Fuel injection is shut off in the cylinder order #1, #4, and #3 at 2.5-second intervals when the engine
is running at 2,000 r/min or more.
Fuel injection to the #2 cylinder is not shut off.
When the throttle-opening angle is 30 degrees or less, fuel injection to the #3 cylinder will begin
again.
When the engine speed decreases to less than 2,000 r/min, fuel injection will begin again in the cyl-
inder order #3, #4, and #1 at 0.2-second intervals.
The warning control mode deactivates when the engine speed is less than 1,600 r/min or the throt-
tle-opening angle is less than 7 degrees.
1-19
General information
Oil pressure
sensor
Below
specified oil
pressure due
to engine
speed
Oil pressure
warning
indicator lights
and buzzer
sounds
DES
Less than
signal
2,000 r/min
Fuel injection
begins again in the
On
cylinder order #3,
#4, and #1
NOTE:
• The warning indicators light for 3 sec-
onds after the engine start switch is
turned on.
Buzzer
• The buzzer sounds if the lanyard is
sounds
removed from the engine stop lanyard
switch while starting the outboard
motor.
Engine speed
2,000 r/min
or more
Fuel injection is
shut off in the
cylinder order #1,
#4, and #3.
63P3F11