Yamaha F150 [23/313] 2 3 4 5 6 7 8 9

Yamaha F150 [23/313] 2 3 4 5 6 7 8 9
63P3F11
1-18
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Fail-safe control
If the electrical components malfunction, the ECM controls the ignition and fuel injection as shown in
the table.
During fail-safe control, the engine idle speed increases to 900 r/min except if the neutral switch is
off when the outboard motor is started.
Malfunctioning item Details Ignition control Fuel control
Pulser coil
No signal received during
four consecutive crankshaft
rotations
Fixed to BTDC 10° Fixed to BTDC 10°
Throttle position
sensor
Output voltage is 0.3 V or
lower or 4.7 V or higher
Controlled accord-
ing to the basic
injection map
Controlled by Intake
air pressure and
engine speed
Intake air pressure
sensor
Output voltage is 0.2 V or
lower or 4.5 V or higher
Normal control
Fuel injection vol-
ume is controlled by
the throttle position
sensor
Engine temperature
sensor
Output voltage is 0.18 V or
lower or 4.93 V or higher
Normal control Normal control
Intake air tempera-
ture sensor
Output voltage is 0.10 V or
lower or 4.61 V or higher
Normal control Normal control
Neutral switch
Switch is off when starting
the outboard motor
Normal control Normal control
Thermoswitch
The switch is on when the
engine temperature is 40 °C
(104 °F) or lower or the
switch is off when the engine
temperature is 130 °C
(266 °F) or higher.
Normal control Normal control
Shift cut switch
Output voltage is 4.50 V or
higher, the switch is on when
the outboard motor is
started, or both the shift cut
switch and neutral switch are
on for 5 seconds
Normal control Normal control
Oil pressure sensor
Output voltage is 0.3 V or
lower or 4.8 V or higher
Normal control Normal control
Technical tips

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