Yamaha F75F - Page 74

Outboard motor troubleshooting
4-6
19
Battery voltage
(Belo
w speci-
fied voltage)
Battery voltage and battery
aler
t are displayed.
Engine operates normally.
Engine does not restart
(depen
ds on battery condi-
tion).
Check the battery cable and
ter
minals for proper connec-
tion.
10-8
Measure the lighting coil out-
put peak voltage.
5-25
Measure the lighting coil resis-
tance.
5-25
Measure the rectifier/regula-
tor output peak voltage.
5-26
Check the rectifier/regulator
f
or continuity.
5-26
23
Air tempera-
ture sensor
(Ou
t of specifi-
cation)
“Check Engine” is displayed.
High engine idle speed
Check the intake air tempera-
ture using the YDIS.
5-30
Check for wiring continuity
betw
een the intake air pres-
sure/temperature sensor and
the engin
e ECM.
A-8
A-10
27
Water in fuel fil-
ter (Water in
fuel f
ilter)
“Water in fuel” is displayed.
Alert buzzer comes on while
the shift is in the N position.
Check the fuel filter for water. —
Measure the water detection
s
witch input voltage.
5-22
Check the water detection
s
witch for continuity.
5-22
Check for wiring continuity
betw
een the water detection
switch and the engine ECM.
A-8
A-10
28
Shift position
s
witch (Irregu-
lar signal)
“Check Engine” is displayed.
Engine operates normally.
Check the gear shift opera-
tion.
10-5
Measure the shift position
s
witch input voltage.
5-32
Check the shift position switch
f
or continuity.
5-32
Check for wiring continuity
betw
een the shift position
switch and the engine ECM.
A-8
A-10
29
Air pressure
se
nsor (Out of
specification)
“Check Engine” is displayed.
High engine idle speed
Declining maximum engine
spee
d
Measure the intake air pres-
sure/temperature sensor input
v
oltage.
5-31
Check for wiring continuity
betw
een the intake air pres-
sure sensor and the engine
ECM.
A-8
A-10
Trouble
code
Item
(Co
ndition)
Symptom Checking steps
See
page