Yamaha F50D Servise Manual - page 86
Troubleshooting
4-7
TRBL
SHTG
Tr
oub
leshooting the PTT unit
Symptom 1:
PTT unit does not operate
.
WD:
See the wir
ing diag
ram.
Symptom 1:
PTT unit does not hold the outboard motor up.
Symptom 2
Cause 1
Cause 2
Chec
king step
Ref
er to
page
PTT rela
y does not
oper
ate
Blo
wn fuse
—
Chec
k the fuse
.
PTT s
witch malfunction
—
Chec
k the PTT s
witch contin
uity
.
PTT rela
y malfunction
—
Chec
k the PTT rela
y contin
uity
.
Shor
t, open, or loose connection of the wir-
ing har
ness
—
Chec
k the wir
ing har
ness contin
uity
.
W
D
PTT motor does not
oper
ate
Shor
t, open, or loose connection in PTT
motor circuit
—
Chec
k the wir
ing har
ness contin
uity
.
W
D
PTT motor malfunction
—
Disassemb
le and chec
k the PTT motor
.
PTT motor oper
ates
,
b
ut the tr
im and PTT
ram does not e
xtend
Man
ual v
alv
e left
open
—
Chec
k the man
ual v
alv
e
.
PTT fluid quantity
—
Chec
k the fluid le
v
el.
PTT fluid leakage
—
Chec
k the PTT unit f
or leakage
.
—
Clogged filter
—
Disassemb
le and chec
k the PTT unit.
Clogged fluid passages
Malfunction of the PTT unit inter
nal par
ts
Symptom 2
Cause 1
Cause 2
Chec
king step
Ref
er to
page
—
Man
ual v
alv
e left open
—
Chec
k the man
ual v
alv
e
.
PTT fluid quantity
—
Chec
k the fluid le
v
el.
PTT fluid leakage
—
Chec
k the PTT unit f
or leakage
.
—
Clogged fluid passages
—
Disassemb
le and chec
k the PTT unit.
Malfunction of the PTT unit inter
nal par
ts