SsangYong: Engine Euro 4. Manual — part 22
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
13
1913
EXHAUST SYSTEM
D27DTP/D27DT (EU4) SM - 2006.08
D27DTP/D27DT (EU4)
ENGINE
FUEL
I
N
T
AKE
EXHAUST
PRE-HEA
TING
LUB
COOLING
SWITCHABLE
ECU
DIAGNOSIS
1. OVERVIEW AND FEATURES OF VGT (VARIABLE GEOMETRY
TURBINE)
Overview
The VGT turbocharger is a certain type of turbocharger
system that controls the turning speed of turbocharger
by changing the passage of the exhaust gas. At low
engine speeds when exhaust flow is low, the inlet port
of exhaust gas to turbocharger is partially closed. This
increases the pressure of the exhaust pushing against
the turbine blades, making the turbine spin faster and
generating more boost. As engine speed increases, so
does exhaust flow, so the inlet port is opened to reduce
turbine pressure and hold boost steady or reduce it as
needed.
Effect
: Increases the output by 10% and torque by 14% compared to conventional turbocharger.
(Refer to the graph above.)
: When the accelerator pedal is pressed, the proper mixture of fuel and air should be
entered into the combustion chamber. However, for the conventional turbocharger,
excessive fuel is supplied when accelerating as the compressor wheel (impeller) does
not supply enough compressed air. The VGT reduces this phenomenon. (To supply the
proper amount of fuel, the VGT turbocharger drives the turbine wheel faster in low speed
range so that the amount of intake air is increased.)
: The shape of turbine blade is change to increase the amount of intake air in low
speed range. Therefore, the exhaust gas and smoke due to excessive fuel is reduced.
Output and
Torque
Fuel
consumption
Exhaust gas
VGT TURBOCHARGER
WGT
turbocharger
T
orque
Engine RPM
• Turbocharger lag
The turbocharger is at idle speed when there is no load or it is in the normal driving condition. During this
period, the amount of exhaust gass passing through the turbine is not enough to turn the compressor wheel
(impeller) fast. Therefore, the intake air is not compressed as needed.
Because of this, it takes time for turbocharger to supply the additional power after the accelerator pedal is
depressed. This is called “turbocharger lag”.
NOTE
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EFFECTIVE DATE
AFFECTED VIN
14
1913
EXHAUST SYSTEM
D27DTP/D27DT (EU4) SM - 2006.08
D27DTP/D27DT (EU4)
Components and Structure of VGT Turbocharger
EGR pipe RH
Oil return tube
Oil supply tube
Vacuum
pump
VGT turbocharger
actuator
Vacuum modulator for
controlling VGT
turbocharger actuator
Turbocharger Tightening Torque
VGT Turbocharger actuator
Compressor housing
Turbine
housing
Adaptor pipe
Structure
VGT turbocharger
Vacuum modulator
connection hose
VGT turbocharger
actuator
* For the function and operating principle of VGT turbocharger, refer to Actyon service manual.
Oil return tube
Turbocharger assembly
Oil supply tube (lower nut)
Support bar
Tightening
torque
23 ± 2.3 Nm
25 ± 2.5 Nm
Oil supply tube (hollow bolt)
Support bar
Engine ECU No.A71
Fuse No.40 (10A)
Tightening torque 25 ± 2.5 Nm
Tightening torque 23 ± 2.3 Nm
Nut
Bolt
Tightening torque 10 ± 1.0 Nm
Tightening torque 15 ± 1.0 Nm
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
15
1913
EXHAUST SYSTEM
D27DTP/D27DT (EU4) SM - 2006.08
D27DTP/D27DT (EU4)
ENGINE
FUEL
I
N
T
AKE
EXHAUST
PRE-HEA
TING
LUB
COOLING
SWITCHABLE
ECU
DIAGNOSIS
3. REMOVAL AND INSTALLATION OF VGT TURBOCHARGER
Structure
When removing and installing the turbocharger, keep the followings:
1. When replacing, use only the one with same specifications.
2. When installing, replace the gasket and sealing with new ones.
3. When installing, keep the specified tightening torque.
4. Check if the actuator operates properly.
Oil return pipe
EGR pipe RH
Vacuum hose
VGT turbocharger
actuator
2. NEW DTCS FOR VGT TURBOCHARGER
Precautions When Removing/Installing VGT Turbocharger
Support bar
Oil supply pipe
P0243
VGT Turbo-
Charger
Actuator
Circuit Short
- Causes
• There is electric problem in the vacuum modula-
tor drive module of turbocharger.
- Check pin for the followings (Vacuum Modulator):
• Power (Main Relay)
• GND (ECU Pin #A71)
- Actions
• Check the unit’s resistance (15.4 +/- 0.7
Ω) and
wiring.
• Check the input voltage (12V).
• Visually check the unit and replace if necessary.
Engine
Malfunction
Indicator
light
DTC
Trouble
Limp
Home
Mode
Delayed
Engine
Stop
Torque
Reduction
(max.
20%)
Help
Torque
Reduction
(max.
50%)
Immedi-
ately
Engine
Stop
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EFFECTIVE DATE
AFFECTED VIN
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EXHAUST SYSTEM
D27DTP/D27DT (EU4) SM - 2006.08
D27DTP/D27DT (EU4)
Ú
Ú
Ú
Ú
Ú Preceding Works: 1. Disconnect the negative battery cable.
2. Drain the engine oil by removing the drain plug of oil pan (if necessary).
1. Remove the intake air duct assembly from the air cleaner.
1. Disconnect HFM sensor connector.
2. Disconnect the hose of oil separator to in-
take inlet duct.
3. Remove the intake inlet duct.
Procedures of Preceding Works
Removal and Installation of VGT Turbocharger
2. Remove the intake outlet hose (A), exhaust pipe (B) and hollow bolt (C) on VGT turbocharger oil supply pipe.
B. Remove two exhaust pipe mounting nuts
from the turbocharger.
Tightening torque: 25 ± 2.5 Nm
C. Remove the hollow bolt on the turbocharger
oil supply pipe.
Tightening torque: 15 ± 1.5 Nm
A. Release the clips and remove the intake
outlet hose.
Tightening torque: 6 ~ 7 Nm
C. Hollow bolt
A. Intake outlet hose
B. Exhaust pipe
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