Doosan D55C-5 Service Manual

D439E Service Manual 4. Fuel system
159
Trouble diagnosis flow when FCCB (Fuel control cylinder balance) fails
OK
Check FCCB
trouble codes
P0301, P0302,
P0303, P0304
Record each trouble code and
erase previous trouble codes.
Check FCCB
compensation value of each
cylinder on the monitor and identify
the cylinder with the greatest
value.
Check other than the
injection system
Check injector
wiring
Faulty because
of FCCB
malfunction
NG
(Continue checking
with the ke
y
on
)
OK
NG
Check Flow
Damper chamber operation
and injector injection (with dia gnosis
equipment). Check if there is any cylinder
without any vibration at 1 cylinder
in
j
ection sto
p
mode.
Flow damper trouble code
- When Flow Damper
operates actually (when
operating mechanically
due to leakage etc)
- When Flow Damper is not
operating actually (When
trouble is caused by
compensation differences)
Check the
Trouble code again.
Trouble judging conditions : water
temperature 75℃, at neutral and
accel 0%
Com
p
leted
NG
NG
OK
Trouble
code of FCCB
malfunction
Re
p
lace ECU
Repair or correct
the wiring
Completed
OK
OK
OK
(check
previous
fault)
OK
Complete
Ex)
Fix the single fail of
sensors, ECU, pump
SCV and TWV system
CKP(Crankshaft
Position)
Sensor system
PC sensor system
(rail pressure sensor)
Accel sensor system
ECU sensor system
(CPU malfunction)
SCV system
TWV system
Malfunction
other than Flow
Damper
operation
Check basic
trouble codes
Fuel s
y
stem checkin
g
flow
Troubleshoot
Flow Damper
operation
trouble code
Current
malfunction
OK
OK (Current
malfunction)
NG
When
replacling
injector)
Input QR
compens
ation date
into ECU
after
replacing
injector.
Com
p
leted
Re
p
lace the in
j
ector
Com
p
leted
Installed to
the system.
Replace
common
rail (Flow
Damper)
Check injector
QR date
compensation
NG
(Above ECU
readin
g)
Corret ECU
reading
Check injector
QR date
compensation
Installed
to injector

Doosan D55C-5 Specifications

General

Brand	Doosan
Model	D55C-5
Category	Engine
Language	English