SsangYong: Engine Euro 4. Manual - part 23

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1913

EXHAUST SYSTEM

D27DTP/D27DT (EU4)  SM - 2006.08

D27DTP/D27DT (EU4)

ENGINE

FUEL

I

N

T

AKE

EXHAUST

PRE-HEA

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LUB

COOLING

SWITCHABLE

ECU

DIAGNOSIS

3. Lift up the vehicle and disconnect the vacuum hose

from VGT turbocharger.

4. Unscrew the lower mounting bolt and  remove the

oil supply pipe.

5. Remove the support bar and the oil return pipe from VGT turbocharger.

Oil Return Pipe

Tightening torque: 10 ± 1.0 Nm

Tightening torque

23 ± 2.3 Nm

Support bar: Tightening torque: 23 ± 2.3 Nm

Upper

Lower

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D27DTP/D27DT (EU4)  SM - 2006.08

D27DTP/D27DT (EU4)

6. Remove three mounting nuts from VGT turbocharger.

Tightening torque: 25 ± 2.5 Nm

7. Remove the VGT turbocharger assembly.

Tightening torque: 25 ± 2.5 Nm

Lower Nut (2EA)

Note

Actuator for controlling

vane angle

Upper Nut (1EA)

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2433

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

VACUUM MODULATOR FOR CONTROLLING VGT
TURBOCHARGER ACTUATOR

1. OVERVIEW AND SYSTEM LAYOUT

For the D27DTP (POWER UP) engine, the vacuum modulator for controlling EGR valve has been deleted and only
the vacuum modulator for controlling VGT turbocharger actuator is used.

System Layout

D27DTP Engine

D27DT Engine

vacuum pump

VGT Turbocharger vacuum modulator

Vacuum
modulator for
EGR valve

Vacuum pump
connection hose

EGR valve

Turbocharger actuator
connection hose

Vacuum pump

WGT turbocharger
vacuum modulator

Vacuum Modulator for Controlling

WGT Turbocharger Actuator

Engine ECU NO.95

Fuse No.39 (15A)

Turbocharger

actuator hose

Vacuum Modulator for EGR Valve

Engine  ECU No.96

Fuse No.39 (15A)

Vacuum Modulator for Controlling

VGT Turbocharger Actuator

Engine ECU

No.A71

Fuse No.40

(10A)

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2433

EXHAUST SYSTEM

D27DTP/D27DT (EU4)  SM - 2006.08

D27DTP/D27DT (EU4)

Operating Principle of Vacuum Modulator

According to the signals from ECU, the solenoid valve regulates the vacuum pressure by vertical movement of
plunger to operate the VGT turbocharger actuator. The plunger is moved by the vacuum pressure (-900 ± 20 mbar)
from the vacuum pump (PWM control type).

The vacuum modulator of D27DTP (Power Up) engine is very similar to that of D27DT
engine. Refer to “DI Engine Service Manual for Rexton”.

Air flow

Duty up (B)

Duty decreased (B)

Diaphram

Seat assembly

Spring

Plunger

Normal condition (A)

Vacuum control

Atmospheric pressure

Output vacuum

Ambient air

Plunger

Connector

Vacuum pump

* The vacuum pressure is adjusted according to the pressure of nipple cover chamber

(I) and the magnetic force (II) of plunger.