ECU SSANGYONG NEW REXTON 2012 Manual PDF

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. -

1725-12
Throttle bodies by engine type
The throttle valve is controlled by electric signals sent from the engine ECU for optimal
fuel injection volume, engine load and effective combustion of EGR gas according to
the Euro 4 regulations. It has following functions by the engine type. -

3. SOOT FILTERING AND BURNING PROCEDURES
1) Operating Procedures of CDPF
The most efficient and practical technology for now is adopted to the diesel particulate filter
(DPF).
This system collects the soot from the diesel engine to the filter and burns the soot so that over
than 95% of soot can be removed from the exhaust gas. However, the durability and the cost of
additional system remain as problems.
Firstly, the exhaust gas is passed through the DOC and its temperature is increased as it is
oxidized. The ECU detects the temperature change with two temperature sensors. The CO, HC
and partial particulate material are removed from the exhaust gas (this procedures are the sames
as the ones for the conventional DOC and no sensor is required).
After the exhaust gas is passed through the DOC and oxidized, most of the harmful material is
removed from the exhaust gas. However, to meet the environmental regulations in the future, the
soot is filtered and burnt again in DPF to decrease the particulate material further.
Rear exhaust gas temperature sensor
(Measuring temperature of exhaust gas
escaping DOC)
The filtered soot is burned whenever the vehicle is driven for 600 ~ 1200 km. The driving
distance can be differed depending on the vehicle's driving conditions. The soot is burnt
for 15 ~ 20 minutes. -

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Front temperature sensor
(Measuring the temperature of
exhaust gas passed through
exhaust manifold)
Differrential pressure sensor (Front
pressure port) Differrential pressure sensor (Rear
pressure port) Rear temperature sensor
(Measuring the temperature of exhaust gas
passed through DOC)
The exhaust gas enters
into CDPF assembly after
passing through the
exhaust manifold.
(Normal temperature of
exhaust gas: approx. The engine ECU detects
the amount of particulate
material colected by the
information from
temperature sensors and
differential pressure snesor.
When the soot is
accumulated, the pressure
difference between the
front and the rear side
occurs. Then, the engine
ECU performs the post
injection to raise the
exhaust gas temperature
and burn the collected soot
at approx. When the exhaust gas
enters into the CDP
F
assembly, its CO, HC and
particulate material are
reduced as it is oxidized in
DOC. The remaining
particulate material is
filtered and collected in
DPF and the temperature
of exhaust gas is
increased to approx. 450
~

2) Fuel Injection During CDPF Regeneration
3) Warning Lamp Related To CDPF
The CDPF system enters the regeneration mode when
the driving distance becomes approx. 600 to 1,200 km
(may differ by the driving condition and driving style).
Then, the engine ECU performs the CDPF regeneration
operation. However, the driver is not informed with this
operation by any engine warning lamp or vehicle
signal, so he/she may not detect this operation. The
control logic at the post-injection during the
regeneration process is to increase the fuel injection
volume and control the intake air volume (by the throttle
body) in order to increase the temperature of the
exhaust gas. The driver may not feel any particular
difference from the vehicle.
No illuminating

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2. CONFIGURATION
1) Circuit Diagram
The engine ECU detects the operating conditions of cruise control system, and monitors the
braking performance, vehicle speed, road conditions and ESP system operation. If the engine
ECU determines that there are not any problem to drive in cruise control mode, the vehicle can be
operated by cruise switch signals (decelerating, accelerating, cruising).

3) Guidelines on Engine Service
To prevent personal injuries and vehicle damages that can be caused by mistakes during engine
and unit inspection/repair and to secure optimum engine performance and safety after service
works, basic cautions and service work guidelines that can be easily forgotten during engine
service works are described in.
Cautions before service works
For safe and correct works, you must observe the working procedures and instructions in this
manual. And, use the designated tools as follow:
Engine stand / Heavy duty engine jack
To prevent the engine from starting abruptly, do not allow anybody to get in the vehicle while
servicing in engine compartment.
Before work on engine and electrical equipment, be sure to disconnect battery negative (-)
terminal.
Before service works, be sure to prepare the works by cleaning and aligning work areas.
Do not allow the foreign material get into the fuel injection system.
When removing the engine, use only the safety hook on engine and engine hanger. Do not
support the bottom of oil pan with a jack. -
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Completely drain the engine oil, coolant and fuel from engine before removal.
Before disassembling/assembling the engine components, carefully read the working
procedures in this manual.
Make sure to keep the specified tightening torques during installation.
Clean and properly lubricate the parts before reassembly.
Carefully check that there is not any interference while servicing. -
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Engine Compartment Layout
Engine assembly
Engine oil dipstick
Vacuum pump
Oil filter and cooler
Fuel filter and priming pump
Brake booster
Brake oil tank
AQGS unit
Washer fluid filler cap
Engine compartment fuse box
PTC relay box
Battery
Vacuum modulator (for VGT turbo charger) 1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.FFH Assembly (Only for vehicle with FFH)
Power steering oil tank
Engine oil filler cap
Fan shroud
E-EGR Valve
High-capacity PCV oil separator
HFM sensor (6.0)
VGT turbo charger
Air cleaner housing
2Coolant surge tank
ABS/ESP HECU (Including TPMS function:
optional)
Exhaust gas FRT Temp. sensor (T3) 14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.

2. SYSTEMS IN ENGINE COMPARTMENT
1) Engine Accessories Related to ECU