Yamaha F150A - Trouble Code and Checking Step

4-8
Outboard motor troubleshooting
Trouble code and checking step
—: Not applicable
Tro uble
code
Item
(Condition)
Symptom Checking steps
See
page
13
Pulser coil
(Irregular signal)
“Check Engine” is displayed.
Engine stall
Measure the pulser coil output peak
voltage.
5-22
Measure the pulser coil resistance. 5-22
Check for wiring continuity between
the pulser coil and the engine ECM.
A-4
15
Engine temperature
sensor
(Out of specification)
“Check Engine” is displayed.
Higher idle speed
Degraded acceleration per-
formance.
Declining maximum engine
speed.
Overheat
Measure the engine temperature sen-
sor input voltage.
5-24
Measure the engine temperature sen-
sor resistance.
5-24
Check for wiring continuity between
the engine temperature sensor and
engine ECM.
A-4
18
TPS
(Out of specification)
“Check Engine” is displayed.
Higher idle speed
Degraded acceleration per-
formance
Measure the TPS output voltage and
opening angle using the YDIS.
5-15
Measure the TPS input voltage. 5-15
Check for wiring continuity between
the TPS and the engine ECM.
A-2
Adjust the TPS. 6-27
19
Battery voltage
(Below specified volt-
age)
Battery voltage and battery
alert are displayed.
Engine does not restart.
(Depends on battery condi-
tion)
Engine operates normally.
Check the lighting coil output peak
voltage.
5-19
Measure the lighting coil resistance. 5-19
Measure the Rectifier Regulator out-
put voltage.
5-19
Check the Rectifier Regulator for con-
tinuity.
5-19
23
Air temperature sen-
sor (Out of specifica-
tion)
“Check Engine” is displayed.
Higher idle speed
Check the air temperature using the
YDIS.
5-23
Measure the air temperature sensor
input voltage.
5-23
Measure the air temperature sensor
resistance.
5-23
Check for wiring continuity between
the air temperature sensor and
engine ECM.
A-4
28
Shift position switch
(Irregular signal)
Engine operates normally.
Check the gear shift operation. 10-7
Measure the shift position switch
input voltage.
5-26
Check the shift position switch for
continuity.
5-26
Check for wiring continuity between
the shift position switch and the
engine ECM.
A-4
29
Air pressure sensor
(Out of specification)
“Check Engine” is displayed.
Higher idle speed
Measure the air pressure sensor
input voltage.
5-24
Measure the air pressure sensor out-
put voltage.
5-24
Check for wiring continuity between
the air pressure sensor and the
engine ECM.
A-4