Yamaha F150A, Service Manual

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2-6
Electronic control system
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A
Fail-safe control
If the electrical components malfunction, the engine ECM controls the ignition and fuel injection as
shown in the table.
*1. Control mode when the part malfunctions.
Trouble
code
Item Trouble conditions to be detected
13 Pulser coil
No signal is sent from one of two sensors 4 or more
consecutive times.
15 Engine temperature sensor
Open or short circuit in the engine temperature sensor
circuit.
Output voltage is less than 0.18 V or more than 4.93 V.
When the engine starts: Set to 5 °C (41 °F), 20 °C
(68 °F), or 40 °C (104 °F) depending on the signal
from the air temperature sensor. *1
18 TPS
Open or short circuit in the TPS circuit
Output voltage is less than 0.3 V or more than 4.7 V.
Determines the fully closed position of the throttle
based on the signal from the air pressure sensor. *1
19 Battery voltage
Voltage is less than 12 V for 2 minutes, even when
engine speed is more than 2000 r/min.
23 Air temperature sensor
Open or short circuit in the air temperature sensor
circuit.
Output voltage is less than 0.1 V or more than 4.61 V.
Set to 40 °C (104 °F). *1
28 Shift position switch
Cranking while in gear.
Cranking while the shift position circuit is open-
circuited.
29 Air pressure sensor
Open or short circuit in the air pressure sensor circuit.
Output voltage is less than 0.2 V or more than 4.5 V.
Temporarily sets air pressure levels based on the
engine speed and the TPS signal. *1
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 1200 r/min.
39 Oil pressure sensor
Open or short circuit in the oil pressure sensor circuit.
Output voltage is less than 0.3 V or more than 4.8 V.
45 Shift cut-off switch
Output voltage is more than 4.5 V, the switch is ON
when the engine is started, or both the shift cut-off
switch and shift position switch are ON for 5 seconds.
46 Thermoswitch Not detected
86 Immobilizer (Y-COP)
Open or short circuit in the Y-COP circuit.
Communication error continues for more than 3
seconds.