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

CHANGED BY

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

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

16

1913

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