Yamaha F150B, Service Manual

Page: 111 / 458

4-6
Troubleshooting the power unit
0
1
2
3
4
5
6
7
8
9
10
A
T
roub
le code and c
h
ec
king step
De
scr
iption
i
n
< > is re
le
v
a
n
t to
the
twin
a
nd tr
ip
le
e
ngin
e
installa
ti
on.
—: N
o
t
ap
plica
b
le
T
roub
le
code
Item
C
o
ndition
La
n ga
u
g
e
displa
y
Symp
to
m
R
e
m
ar
ks
Ch
ec
king
st
eps
Ref
e
r to
p
age
13
P
u
lser coil mal-
fu
nc
tio
n
Ir
re
g
u
lar
sig
nal
C/
E
Highe
r idle
sp
eed
—
1.
Mea
s
ure
t
h
e pulse
r co
il out
-
pu
t pe
ak
v
o
lta
g
e
.
5-
30
2.
Mea
s
ure
t
h
e pulse
r co
il
re
si
s
tan
ce
.
5-
30
3.
Chec
k f
o
r wir
ing
contin
uity
be
tw
een
t
h
e pulser
co
il and
en
gine
ECM.
5-
30
A-5
4.
Chec
k th
e pr
oje
c
ti
on
s o
f t
he
pla
te
f
o
r
dam
age
.
7-
17
15
E
n
g
ine
te
m
p
s
e
n
-
s
o
r malfunction
Ou
t o
f specif
ica-
tio
n
C
/E
Higher idle
speed
Deg
ra
ded
a
c
ce
ler
a
tio
n
per
fo
rm
ance
Declining maxim
u
m engine s
p
eed
—
1.
Mea
s
ure
t
h
e
eng
ine
t
e
m
per
-
at
ur
e sensor
inpu
t v
o
lt
a
g
e
.
5-
33
A-5
2.
Mea
s
ure
t
h
e
eng
ine
t
e
m
per
-
at
ur
e sensor
re
sist
ance
.
5-
33
3.
Chec
k f
o
r wir
ing
contin
uity
be
tw
een
t
h
e
eng
ine
t
e
m
per
-
at
ur
e sensor
and
e
n
g
ine
EC
M.
5-
33
A-5
18
T
h
ro
tt
le po
sitio
n
se
nsor
m
a
lf
unc-
tio
n
Ou
t o
f specif
ica-
tio
n
C
/E
Higher idle
speed
Deg
ra
ded
a
c
ce
ler
a
tio
n
per
fo
rm
ance
Declining maxim
u
m engine s
p
eed
—
1.
Chec
k th
e TPS using t
h
e
YD
IS
.
5-
16
2.
Mea
s
ure
t
h
e
TPS in
put
v
o
lt
-
ag
e
.
5-
16
A-5
3.
Chec
k f
o
r wir
ing
contin
uity
be
tw
een
t
h
e
TPS
an
d e
n
g
ine
EC
M.
5-
16
A-5
4.
Adjust
th
e TPS
.
6-
21