Yamaha F30B 2018, Service Manual

Page: 37 / 348

2-5
Electronic control system
Fail-safe
In the fail-safe control, the engine ECM enters the fail-safe control mode when an electrical component
malfunctions.
The fail-safe control system records the trouble codes according to the engine trouble conditions.
Trouble
code
Item
Trouble conditions to be detect-
ed
Control and operation
15 Thermo sensor
Open or short circuit in the
thermo sensor circuit.
Output voltage is 0.2 V or less
or 4.9 V or more.
Control is performed based on
the intake air temperature
when starting.
Set to 40

C (104

F) when
running.
High engine idle speed.
18 TPS
Open or short circuit in the
TPS circuit.
Output voltage is 0.3 V or less
or 4.7 V or more.
Control is performed based on
the intake air pressure.
High engine idle speed.
19 Battery voltage
Voltage is 12 V or less for 2
minutes, even when engine
speed is 2000 r/min or more.
High engine idle speed.
23
Intake air tempera-
ture sensor
Open or short circuit in the in-
take air temperature sensor
circuit.
Output voltage is 0.4 V or less
or 4.8 V or more.
Set to 40

C (104

F).
High engine idle speed.
27 Water in fuel filter
The shift position switch is on
and the water detection switch
is on.
The alert buzzer sounds.
28 Shift position switch
Cranking while in gear.
Cranking while the shift posi-
tion switch circuit is open-cir-
cuited.
ECM does not control.
29
Intake air pressure
sensor
Open or short circuit in the in-
take air pressure sensor cir-
cuit.
Output voltage is 0.1 V or less
or 4.4 V or more.
Control is performed based on
the TPS.
High engine idle speed.
37 Intake air passage
The shift position switch is off,
the throttle is fully closed, the
ISC valve is fully closed, and
the engine speed is more than
1100 r/min.
Ignition timing is retarded to
limit the engine speed to 900 r/
min.
Ignition is skipped if the engine
speed does not decrease to
900 r/min even if ignition timing
is fully retarded.
44
Engine shut-off
switch Cranking when the clip is re-
moved.
Fuel injection is cut.