2012 SSANGYONG NEW REXTON Service Manual

1881-09
3) Fuel Rail - Chrome Color
D27DTP & D27DT (EU IV)
Common rail)
D27DT
Common rail)The I.D and O.D of the fuel rail between
HP pump and common rail are increased
according to the increased amount of fuel
injection.
Also, the engine ECU, HFM sensor and
EGR system are changed to control the
fuel injection volume and engine more
precisely.

2. COMPONENTS OF FUEL SYSTEM

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Fuel Supply System

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1. INTAKE SYSTEM LAYOUT
The intake system for the D27DTP (POWER UP) engine is equipped with the throttle body that has
a flap to block the air coming to the engine when the engine is switched off. Therefore, the
structure of the intake manifold has been changed.
Also, the improved HFM sensor (from HFM5.0 to HFM6.0) has been installed to control the intake
air precisely so that the NOx in the exhaust gas can be decreased.

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1. COMPONENTS
The components of the exhaust system for the D27DTP (POWER UP) engine have been changed
as follows:
1. E-EGR valve: Controlling the EGR valve electrically and sends the valve location signal to
ECU (vacuum modulator control has been deleted)
2. EGR cooler: Decreasing EGR gas (NOx) efficiently by cooling the EGR gas and let it flow to
the intake pipe
3. VGT turbocharger: Increase in capacity and performance compared to D27DTP & D20DT
engine
The EGR system has been changed to control NOx more efficiently and the VGT turbo charger
has been changed to increase the engine power. For more details, refer to the next description.
The exhaust system for D27DTP (POWER UP) engine is as follows:

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1. OVERVIEW FOR CDPF (EURO IV)
1) General Description
The CDPF (Catalyst & Diesel Particulate Filter) was installed to the Rexton II D27DTP engine
previously. However, it is now installed to the all 2009 DI engine models, except the
Actyon
Sports. The DI engine types installed to Rexton are D27DTP, D27DT and D20DT, and their CDPF,
related sensor and operation logic are the same.
This section describes the CDPF system (based on Euro IV) which is installed to the Rexton II
D27DTP engine (older model).
2) Compatibility of CDPF System by Vehicle Model
Rexton II: Same CDPF system for D27DTP and D27DT engines (including its components)
Kyron & Actyon: Same CDPF system for D27DT and D20DT engines (including its components)
The CDPF assemblies installed to the Euro IV D27DTP Rexton II and 2009 Rexton II are
different in their mounting layout, but their front/rear exhaust temperature sensors and
differential pressure sensors are same. -
3) System Met with Euro IV Regulations
E-EGR valve
EGR cooler
Engine ECU (Ver. 3.2)
HFM sensor
C3I injector
Electronic throttle valve (body)
Other engine mounting components -
-
-
-
-
-
-
For details about the modified components and system related to the Euro IV regulations, refer to
the 2008 Rodius engine service manual.

2. CDPF(EURO IV) SYSTEM
The CDPF system is only installed to the D27DT engine, and the major changes comparing to the
previous D27DT engine is as follows:
CDPF (Catalyst & Diesel Particulate Filter) and sensors
Under air cleaner in righ
side of engine
compartment
As the soot is filtered in the CDPF, the pressure between the front side and the rear side of the
filter is different from each other. If the amount of soot is over 28 g, the soot is burnt in the
CDPF. The combustion is determined depending on the pressure difference, temperature of
exhaust gas and EGR ratio. According to these, the soot filtered by post injection of injector is
burnt at
CDPF Exhaust Gas Temperature Sensor
The two temperature
sensors inside the CDPF
are installed in exhaust
manifold (front exhaust
gas temperature sensor)
and in DOC (rear exhaust
gas temperature sensor),
and perform the following
functions.Front Exhaust Gas Temperatur
e
Sensor:Rear Exhaust Gas
Temperature Sensor:
Measures the exhaust gas
temperature of the exhaust manifold.
As it is installed in front of the VGT
turbocharger, it also monitors the
exhaust gas temperature coming to
the turbocharger. If the temperature
of the exhaust gas flowing to the
turbocharger is higher than the
specification, the engine lowers the
exhaust gas temperature.Measures the increased
exhaust gas temperature
after the oxidation process
of DOC. If the temperature
injection amount is
increased to increase the
temperature.
Front exhaust gas
temperature sensor

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Throttle Body
CDPF system controls the amount of intake air by
controlling the electronic throttle body. The electronic
throttle body has the following main functions.
CDPF control - added a function that increases the
exhaust gas temperature by closing the throttle valve
flap to minimize the intake air amount by the fuel
injection amount during the CDPF regeneration range
with the low engine load range.
ON/OFF control - prevents the engine from turning off
with vibration and noise by closing the throttle body flap
to block the intake air when the engine is stopped.
Duty control - controls the valve inside the throttle body
to burn more EGR gas in the EGR valve operating range.
VGT Turbocharger and Front Exhaust Gas Temperature Sensor
Front exhaust gas
temperature sensorTurbocharger may become weaker if high
temperature exhaust gas passes through the
turbocharger for DPF regeneration process.
The front exhaust gas temperature sensor monitors
the temperature of the exhaust gas that flows into
the turbocharger.
If the temperature of the exhaust gas that passes
through the exhaust manifold is higher than the
specification, the ECU decreases the fuel injection
amount and increases the EGR gas intake amount
to decrease the exhaust gas temperature.