2012 SSANGYONG NEW REXTON ECU

1533-01
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
remainas 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 fo
r
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.
The filtered soot is burned whenever the vehicle is driven for 600 ~ 1200 km. The driving distance
can be differed depending on the
driving conditions. The soot is burnt for 15 ~ 20
minutes. -Exhaust
gas
Rear exhaust gas temperature
sensor(Measuring temperature of
exhaust gas escaping DOC)

1533-01
Front temperature sensor
(Measuring the temperature of
exhaust gas passedthrough
exhaust manifold)Rear temperature sensor
(Measuring the temperature of exhaust
gas passed through DOC)
Differrential pressure sensor
(Front pressure port)Differrential pressure sensor
(Rear pressure port)
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 be-tween the front
and the rear side occurs.
Then, the engineECU
performs the post injec-tion to
raise the exhaust gas
temperature and burn the
collected soot at approx. The exhaust gas enters
intoCDPF assembly after
passing through the exhaust
manifold. (Normal
temperature of ex-haust gas: When the exhaust gas
enters into the CDPF
assembly, its CO, HC and
particulate mate-rial are
reduced as it is oxi-dized in
DOC. The remaining
particulate material is
filtered and collected in
DPF and the temperature
of exhaust gas is increased

2) Fuel Injection During CDPF Regeneration
3) Warning Lamp Related To CDPF
CDPF regeneration process (warning lamp NOT illuminated)
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 in-formed with this operation by an
y
engine warning lamp or vehicle signal, so he/she may not
detect this operation. The control logic at the post-injection
dur-ing 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 tem-perature of the
exhaust gas. The driver may not feel any particular difference
from the vehicle.
No illumination

0000-00
Glow Plug
1. LAYOUT OF PRE-GLOW SYSTEM
The pre-glow system in D20DT engine has four glow plugs. And, the terminal T for pre-glow completion
signal is not used since the remote start function has been deleted.
Tightening torque
Engine ECUPre-glow Indicator
(Instrument cluster)
Ground
terminal
Pre-glow control
signal (ECU 113)IG1 power
terminal
Not available for the
vehicle without
remote start functionGlow plug
terminals
(#1~#4)
K-Line
(ECU 34)
G5 terminal
deleted
Battery
main
cable
Glow Plug Control Relay

0000-00
2. OPERATION
Glow plug is installed in the cylinder head. It enhances the cold starting performance and reduces the
exhaust gas during cold starting.
1. Pre-heating
2. Post-heating during engine running If normal communication with the ECU is established 2 seconds after the power is supplied to the IGN
terminal from the battery, the ECU supplies the battery voltage to glow plugs.
The post-heating controlled by ECU begins its operation after engine start The time for pre-heating is controlled by the ECU. -
The time for post-heating controlled by the ECU starts from engine start. This improves the idling
conditions and reduces the emission and noise. -
2) System Check
Glow Plug
Forced Shut-off of Relay
Check for short in each glow plug
Check for open due to over-voltage in each glow plug
Check for open to ground in glow plug -
-
-
When the glow plug circuit is open to ground. -
1) Operation
Pre-
heatingCoolant
temperature
Operating time 31s 22s 19s 17s 14s 0s 0s
Operating
conditions- IGN: ON
- B+: below 15.2 VStop
conditions- Time-out
- IGN: OFF
- when engine cranking
Post-
heatingCoolant
temperature
Operating time 115s 80s 30s 19s 11s 11s 0s
Operating
conditions- after engine start Stop
conditions-Time-out
- Torque: 190/170Nm
- rpm: 2100/2050

K-Line Communication
ECU starts to communicate by sending the result to pre-glow timer relay through K-Line.
Pre-glow timer relay sends the message with self-diagnosis data for glow plug to ECU.
The glow plug responses only for request.
ECU starts self-diagnosis operation from 2 seconds after power input.
Communication error occurs when: -
-
-
-
-
No response from pre-glow module for a certain period of time
Checksum error
Insufficient byte
3) DTC
DTC Description Error
P1678 GCU circuit is open GCU circuit is open
P1679 GCU circuit is short GCU circuit is short
P1680 GCU circuit is short to ground GCU circuit is short to ground
P1676Communication error Communication error between ECU and
GCU
P1677Defective GCU Communication error between ECU and
GCU
P0671 GCU channel 3 opened circuit GCU channel 3 circuit is open
P0672 GCU channel 4 opened circuit GCU channel 4 circuit is open
P0674 GCU channel 1 opened circuit GCU channel 1 circuit is open
P0675 GCU channel 2 opened circuit GCU channel 2 circuit is open

8510-23
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).