Hyundai: Engine D4FA. Manual — part 168
FUEL DELIVERY SYSTEM-DIESEL
FLA -543
10. Press "AVG" and the data average of each cylinder is
appeared.
Press "HELP" and description of the data is appeared.
Speed(RPM) 650 700 750 800 AVG.
Cylinder engine speed(RPM)
#1 CYL.
#2 CYL.
#3 CYL.
#4 CYL.
793
800
753
771
PREV
HELP
*The lower engine speed:
->The injector injects less quantity
than other injectors.
*The higher engine speed:
->The injector injects more quantity
than other injectors.
7.2 IDLE SPEED COMPARISON
PREV
LFIF660M
11. After pressing "ESC", select "INJECTOR QUANTITY
COMPARISON" and press "[ENTER]".
12. Set the test condition described as below screen and
press "[ENTER]".
7.3 INJECT. QUANTITY COMPARISON
This test is used for detecting
cylinder specific quantity with
individual energizing of injector.
(Cylinder balancing function is
activated.)
* Test condition
- Compression test : Normal
- Shift lever : P or N
- Engine : Idle
- Electrical Load : OFF
If you ready, Press [ENTER].
LFIF660O
13. The data od each cylinder about RPM and compen-
sating injection quantity is appeared.
7.3 INJECT. QUANTITY COMPARISON
Analyze the test result.
Eng. Speed(RPM)
#1
#2
#3
#4
#1
#2
#3
#4
792
788
794
792
788
794
790
800
798
802
798
798
802
798
758
760
758
758
758
758
754
774
774
776
774
772
772
770
4.0
4.0
4.0
4.0
4.0
4.0
4.0
-2.9
-2.9
-2.9
-2.8
-2.8
-2.8
-2.9
-2.8
-2.7
-2.7
-2.7
-2.6
-2.8
-2.8
-2.4
-2.4
-2.4
-2.4
-2.4
-2.5
-2.5
ANAL
Speed(RPM) 650 700 750 800 AVG
Cylinder engine speed(RPM)
<Abnormal state>
#1 CYL.
#2 CYL.
#3 CYL.
#4 CYL.
791
799
757
773
PREV
HELP
#1 CYL.
#2 CYL.
#3 CYL.
#4 CYL.
4.0
-2.8
-2.7
-2.3
Injection quantity(mm3)
Quant.(mm ) -4 -2 0 2 AVG
3
LFIF660P
14. Press "HELP" and description of the data is displayed
as below.
7.3 INJECT. QUANTITY COMPARISON
*The positive correction value:
->The fuel injection of the cylinder
is less than that of other cylinder.
*The negative correction value:
->The fuel injection of the cylinder
is more than that of other cylinder.
*Extreme correction value identifies a
problematic injector.
After replacinga injector with new one,
reset & confirm the engine condition.
LFIF660R
FLA -544
FUEL SYSTEM
15. Replace the default injector, and then repeat previous
test modes to check if the injector is normal.
COMPONENT INSPECTION
1.
Turn ignition switch "OFF".
2.
Disconnect injector connector.
3.
Measure resistance between the terminals 1 and 2 of
injector connector.
Resistance : 0.22 ~ 0.30Ω (20 ~ 70℃)
LFAC220F
FUEL DELIVERY SYSTEM-DIESEL
FLA -545
COMMON RAIL
DESCRIPTION
ED51BCCF
The common rail stores the fuel at high pressure. At the
same time, the pressure oscillations which are generated
due to the high-pressure pump delivery and the injection
of fuel are damped by the rail volume. This common rail is
common to all cylinders, hence its name ""common rail"".
Even when large quantities of fuel are extracted, the com-
mon rail maintains its inner pressure practically constant.
This ensures that the injection pressure remains constant
from the moment the injector opens.
In order to comply with the wide variety of engine installa-
tion conditions, the common rail with its flow limiters and
the provisions for attaching rail pressure sensor, fuel pres-
sure control valve, and pressure limiter valve is available
in a number of different designs.
The available common rail volume is permanently filled
with pressurized fuel. The compressibility of the fuel re-
sulting from the high pressure is utilized to achieve the ac-
cumulator effect. When fuel leaves the rail for injection, the
pressure in the common rail remains practically constant.
Similarly, the pressure variations resulting from the pulsat-
ing fuel supply from the high-pressure pump are compen-
sated for.
REMOVAL
E0BBB382
CAUTION
• Common
Rail Fuel Injection
System
is
subject to extremely high pressure (Approxi-
mately 1,600 bar)
• Never perform any work on injection system
with engine running or within 30 seconds af-
ter the engine stops.
• Always pay attention to safety precaution.
• Ensure the absolute cleanliness.
• It is not recommended to remove the injectors
without any notice.
1.
urn ignition switch to OFF position.
2.
Disconnect the negative battery (-) terminal and wait
for about 30 seconds.
3.
Remove the high pressure pipe (A) connecting injec-
tors and common rail.
4.
Remove the high pressure pipe (B) connecting high
pressure pump and common rail.
5.
Disconnect the return lines (C).
B
A
C
LGJF502S
6.
Disconnect rail pressure sensor and rail pressure con-
trol valve connectors.
7.
Remove intake manifold. (Refer to "EM" group)
8.
Remove the common rail (E) by unscrewing the two
mounting bolts (F).
E
F
LGJF502T
FLA -546
FUEL SYSTEM
INSTALLATION
EED527BE
1.
Install the common rail(A) with two mounting bolts(B).
Tightening Torque : 14.7 ~ 21.6 N·m (10.9 ~ 15.9 lbf·ft)
A
B
LGJF502U
2.
Install the intake manifold. (Refer to "EM" group).
3.
Connect rail pressure sensor and rail pressure control
valve connectors.
4.
After screwing the high pressure pipe installation nuts
by hand, tighten them at accutate torque using special
service tools(09314-27110, 09314-27130).
SST
LGJF502R
5.
Connect return line(C).
C
AFGF301P
6.
Connect the negative battery(-) terminal.
7.
Start the engine and check for leakage on fuel line.
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