Yamaha F225F, Service Manual

Page: 135 / 576

4-10
Troubleshooting the power unit
0
1
2
3
4
5
6
7
8
9
10
A
24
Ca
m posit
ion
se
nsor
(
EXH)
malfunc
tion
Ir
re
gula
r sign
al
C/
E
High en
gin
e
idle spe
e
d
Deg
ra
ded
a
c
ce
ler
a
tio
n
per
fo
rm
ance
Declining maxim
u
m engine s
p
eed
<Dif
fe
rence in
e
ngin
e
spee
ds>
<E
ng
ine
s
p
e
e
d
s
do
n
o
t sy
nc
hr
o-
niz
e
>
—
Me
asur
e t
he cam po
sitio
n
se
n-
sor
inpu
t v
o
lt
ag
e
.
5-
29
Me
asur
e t
he cam po
sitio
n
se
n-
sor
out
pu
t v
o
lt
ag
e
.
5-
29
Chec
k
f
o
r
wir
ing c
o
ntin
uity
b
e
tw
ee
n t
he cam po
sitio
n
se
n-
so
r
a
n
d
th
e en
gin
e
ECM
.
5-
29
A-3
Ch
ec
k
th
e
br
im
o
f
th
e c
a
m
s
h
a
ft.
7
-4
7
27
W
a
te
r in f
uel
W
a
te
r in fu
el
W/
F
A
ler
t
b
u
zz
e
r come
s on
wh
ile th
e
s
h
if
t is
in
th
e N po
s
itio
n
—
Ch
ec
k
th
e fu
el filte
r f
o
r
w
a
te
r.
—
Me
asur
e t
he w
a
te
r de
te
ct
io
n
s
witch input v
o
ltage
.
5-
34
Ch
ec
k
th
e
w
a
te
r de
te
ct
ion
s
witch f
o
r
contin
uity
.
5-
34
Chec
k
f
o
r
wir
ing c
o
ntin
uity
b
e
tw
ee
n t
he w
a
te
r de
te
ct
io
n
s
witch a
nd t
he en
gin
e
ECM
.
5-
34
A-5
29
In
ta
k
e
pr
ess
sen
-
so
r ma
lfu
n
ctio
n
Out
of
sp
ecifica-
tio
n
C/E
High engine idle speed Declining maxim
u
m engine s
p
eed
<Dif
fe
rence in
e
ngin
e
idle
spe
e
d
s
>
<E
ng
ine
s
p
e
e
d
s
do
n
o
t sy
nc
hr
o-
niz
e
>
—
Me
asur
e th
e air
pr
essur
e
se
nsor
in
put
v
o
lt
age
.
5-
49
Me
asur
e th
e air
pr
essur
e
se
nsor
o
u
tput
v
o
lt
ag
e
.
5-
49
Chec
k
f
o
r
wir
ing c
o
ntin
uity
b
e
tw
ee
n th
e air
pr
essur
e
se
nsor
a
nd t
he e
ngin
e
ECM
.
5-
49
A-7
Tr
o
u
b
le
code
It
em
C
o
n
d
it
ion
L
A
N ga
uge
dis
p
la
y
Sym
p
to
m
R
ema
rks
Chec
king
st
ep
s
S
ee
p
age