2012 SSANGYONG NEW REXTON fuel

1212-01
Top View
19. Cylinder head cover
20. Intake manifold
21. Water outlet port
22. Common rail
23. Fuel pressure sensor24. Fuel pipe
25. Injector
26. Fuel return line
27. Oil filler cap
28. Glow plug29. Booster pressure sensor
30. PCV valve and oil separator
31. Oil dipstick
32. EGR-LH (#1) pipe

1881-09
MAJOR CHANGES IN FUEL SYSTEM OF D27DTP (POWER
UP) ENGINE 1.
There are some changes in the parts related to the fuel system due to the newly adopted
D27DTP (POWER UP) engine. The major changes are as follows. Refer to the next pages for
further details.
1) Injector
Two nozzle holes are added (currently 7)
to the tip of the injector to increase the
amount of fuel injection and to improve
injection efficiency according to the
increased engine power.
The existing C2I coding (16 digits) is
changed to C3I coding (20 digits) to
monitor fuel injection and follow the target
value.
For the D27DT engine, the injector MD
P
(minumum current for the solenoid in the
injector to lift the nozzle) is leaned only
when the engine is running. However, for
the D27DTP engine, it is learned when the
vehicle is in motion and the engine is at
idle speed.
D27DTP & D27DT (EU IV)
D27DT

2) Common Rail
The orifice is added to the connection to
the fuel pipe of the HP pump to prevent
the fuel pulsation by the fuel supply and
fuel cut according to the increase of
injected fuel volume. (It is also installed on
the connection of the high pressure fuel
supply line of the HP pump.)D27DTP & D27DT (EU IV)
D27DT

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

1881-09
Fuel Supply System

1725-12
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.

1725-12
2. CDPF (EURO IV) SYSTEM CONTROL
1) Combustion Temperature and Procedures
As the soot is filtered in the CDPF, it is burnt and removed, and the CDPF is returned to the initial
state to collect the soot. Therefore, the burning procedures in the CDPF can be called as
regeneration.
The CDPF assembly is integrated with DOC (at front side) and DPF (at rear side).
The DPF burns the soot with high-temperature exhaust gas (over
The rear exhaust gas
temperature sensor monitors the temperature of DPF section. If this temperature is below the
regeneration temperature, the ECU increases the post injection period to increase the fuel
injection amount, and consequently to increase the exhaust gas temperature.
Front exhaust gas temperature sensor
(Measuring temperature of exhaust gas in
exhaust manifold)
Rear exhaust gas temperature sensor
(Measuring temperature of exhaust gas escaping DOC)
Normally, when the vehicle is driven for 600 ~ 1,200 km, the enough amount of soot to be
burnt is filtered and accumulated in the CDPF. The ECU increase the amount of post
injection to increase the tempeature of exhaust gas up to
so that the soot is burnt.
The soot is burnt for 15 ~ 20 minutes. -