Fail-Safe Control - Yamaha F150B Service Manual

TECH
FEA

Fail-safe control

If the electrical components malfunction, the engine ECM controls the ignition and fuel injection as
shown in the table.
Trouble Malfunction
code components
13 Pulser coil
15 Engine temper-
ature sensor
18 TPS
23 Air temperature
sensor
28 Neutral switch
29 Air pressure
sensor
39 Oil pressure
sensor
45 Shift cut switch
46 Thermoswitch
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.
2-17
Technical features and description
Criterion
No signal received during four
consecutive crankshaft rota-
tions
Output voltage is less 0.18 V or
more 4.93 V
Output voltage is less 0.3 V or
more 4.7 V
Output voltage is less 0.10 V or
more 4.61 V
Switch is off when starting the
engine
Output voltage is less 0.2 V or
more 4.5 V
Output voltage is less 0.3 V or
more 4.8 V
Output voltage is more 4.5 V,
the switch is on when the
engine is started, or both the
shift cut switch and neutral
switch are on for 5 seconds
The switch is on when the
engine temperature is less
40 °C (104 °F) or the switch is
off when the engine tempera-
ture is more 130 °C (266 °F)
Ignition control
Fixed to BTDC 10°
Normal control
Controlled according to
the basic ignition map
Normal control
Normal control
Normal control
Normal control
Normal control
Normal control
Fuel injection control
Fixed to BTDC 10°
Normal control
Controlled by intake air
pressure and engine
speed
Normal control
Normal control
Fuel injection volume is
controlled by the TPS
Normal control
Normal control
Normal control