Yamaha F75F - Trouble Code and Checking Step

Outboard motor troubleshooting
4-5
Trouble code and checking step
—: Not applicable
19 Battery voltage  
23 Air temperature sensor  
27 Water in fuel filter  
28 Shift position switch  
29 Air pressure sensor  
44 Engine shut-off switch  —
56 Main power supply  
57 Starter magnet power supply  
58 HP fuel pump PWR supply  
86 Immobilizer  
Trouble
code
Item
(Co
ndition)
Symptom Checking steps
See
page
15
Thermo sensor
(Ou
t of specifi-
cation)
“Check Engine” is displayed.
High engine idle speed
Degraded acceleration perfor-
mance
Declining maximum engine
spee
d
Overheat
Measure the thermo sensor
in
put voltage.
5-31
Measure the thermo sensor
resist
ance.
5-31
Check for wiring continuity
betw
een the thermo sensor
and the engine ECM.
A-8
A-10
17
Knock sensor
(Irregular sig-
nal)
“Check Engine” is displayed.
High engine idle speed
Measure the knock sensor
resist
ance.
5-32
Check for wiring continuity
betw
een the knock sensor and
the engine ECM.
A-8
A-10
18
TPS (Out of
sp
ecification)
“Check Engine” is displayed.
High engine idle speed
Degraded acceleration perfor-
mance
Measure the TPS output volt-
age and opening angle using
the YDIS
.
5-19
Measure the TPS input volt-
age.
5-19
Check for wiring continuity
betw
een the TPS and the
engine ECM.
A-8
A-10
Code No. Item YDIS diagnosis
YDIS diagnosis
record