Doosan 50001, Shop Manual

Page: 453 / 898

SP001434
Page 273
Engine
Engin
e stopped o
r r
est
rict
ed
by ECU
fa
ilure
diagno
sis
fu
nction
ECU control function active O O O
•
This is not a failure.
Switch to the normal mode.
Refer to the control manual.
Water temperature sensor disconnected or short-
circuited
O O O
Repair or replace the harness.
Replace the water temperature
sensor.
Accelerator sensor disconnected or short-
circuited
O O
Repair or replace the harness.
Replace the accelerator
sensor.
Speed sensor signal error O O O
Repair or replace the harness.
Repair or replace the fuel
injection pump.
Rack position sensor signal error O O O O O
Repair or replace the harness.
Repair or replace the fuel
injection pump.
Rack actuator malfunctioning O O O
Repair or replace the harness.
Repair or replace the fuel
injection pump.
Engine overspeed occurs O O
Check for idle rotations caused
by the working machine.
Check the speed sensor
signal.
CAN Communication error O O O
Repair or replace the harness.
Replace the ECU.
The EGR valve motor disconnected or short-
circuited.
O O O
Repair or replace the harness.
Replace the EGR valve.
CSD solenoid valve disconnected or short-
circuited.
O O O
Repair or replace the harness.
Replace the CSD valve
solenoid.
Start assist relay disconnected or short-circuited. O O
Δ
O
Repair or replace the harness.
Replace the relay.
Main relay cannot be turned off O O Replace the relay.
Rack actuator relay disconnected or short-
circuited
O ? O
Repair or replace the harness.
Replace the relay.
Error detected by ECU self diagnosis O ? O Replace the ECU.
Symptoms and conditions of failure
Possible causes
Starting failure
Engine stall
after start up
Speed control error
Engine
output low
Noise and
vibration
Lubricating oil
Cooling
water
Intake
air
Exhaust gas Fuel Electrical parts
Corrective Action Referenced page number
Starter does
not rotates
Starter
rotates
Smoke
R
evol
u
tion
sp
ee
d
ca
nn
ot be changed
wi
th
ac
celerator
(s
tays
at
a consta
n
t
sp
ee
d)
No load
Work
load Smoke
color
Hi
gh knockin
g sound
at
combu
sti
on tim
e
Uneven combusti
on
so
und
Abn
orm
al
sound
(other than
co
mbustio
n sound
)
fr
om
engin
e
Engine
vi
br
ates
heav
ily
Too
m
uch lu
bricating
oil
consum
ed
Lub
ricating
oil
di
luted w
ith
fu
el
L
ubri
catin
g oi
l m
ixed w
ith
water
O
il pr
es
su
re
low
(
o
il pr
es
su
re
wa
rn
ing
la
mp
li
t)
Over
heat
(w
ater
tem
p
era
ture
w
ar
n
ing l
am
p
li
t)
Water tempe
rat
ure l
o
w
Pr
essur
e low (a
ir
c
le
aner
w
arni
ng
lamp l
it)
Pr
essur
e h
igh
Work
load
T
oo m
uch b
low
-by
e
Exhaust gas ternperature h
igh
T
oo m
u
ch fuel
consumed
F
u
el
mi
xed wi
th
w
ater
(oil
-w
ater
separ
ator
w
ar
n
ing
lam
p
li
t)
F
uel fi
lte
r foul
ed
shortl
y
B
atte
ry
c
h
ar
ge
e
rror
(c
ha
rg
e
la
mp
li
t)
ECU fa
ilure
lam
p
fl
ashes
ECU
fail
ure lamp stop
s flashin
g im
m
ed
iately (with
in 2 secin
d
s) afte
r tur
n
ing
off th
e key
Specific Ecu c
on
tr
ol f
u
nct
ions
fail
.
F
u
se
s g
et
bl
own o
r b
roken (r
epeat
edly
)
ECU
fa
ilur
e
lamp
does no
t
go o
n
im
m
ed
iat
el
y
af
ter
tu
rnin
g on
the ke
y
EC
U failu
re lam
p
g
o
es in
im
m
ed
iat
ely(with
in
2 second
s) after
tur
n
ing o
n
the ke
y
Engi
ne
does not
st
art u
p (w
ithout i
nitial
ig
nition
)
Engi
ne
does not
st
art u
p
(it stops
imm
edia
te
ly
a
fte
r ini
tia
l igni
ti
on)
It
tak
es l
onger
th
an
before to
st
art u
p
engi
ne
N
one
sl
ight
Re
ma
rk
ab
le
C
an
not be set to p
art
icul
ar
s
p
eed
Poo
r acc
ele
ra
tion
D
o
es
not sm
o
o
thl
y re
turn to
lo
w speed
H
unting occ
u
rs
H
unting occ
u
rs
No
rm
al
Wh
it
e
Bl
ac
k
Wh
it
e ex
h
au
st g
as
B
lac
k e
xhaust
gas