differential SSANGYONG NEW ACTYON SPORTS 2012 Service Manual

02-70000-00
3. CHECK AND INSPECTION
1) Cylinder
(1) Compression pressure test
Specified value ▶
Compression ratio16.5 : 1
Test conditionat normal operating temperature (80˚C)
Compression pressureStandard32 bar
Minimum18 bar
Differential limit between cylindersMaximum 3 bar
The compression pressure test is to check the conditions of internal components (piston, piston
ring, intake and exhaust vale, cylinder head gasket). This test provides current engine operating
status.
Before cranking the engine, make sure that the test wiring, tools and persons are keeping
away from moving components of engine (e.g., belt and cooling fan).
Park the vehicle on the level ground and apply the parking brake.
Do not allow anybody to be in front of the vehicle. -
-
-
Measurement ▶
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47004f005f005700b6006a00500055>
Disconnect the fuel rail pressure sensor connector to cut off the fuel injection.
Remove the air cleaner duct and glow plugs. -
-
-
Place the diagram sheet to compression
pressure tester and install it into the plug
hole. 1.

14-6
Excessive overload of CDPF (warning lamp illuminated)
If the vehicle is driven at a speed of 5 to 10 km/h for an extended period of time, the soot
accumulated in the CDPF cannot be burned as the CDPF cannot reach the regeneration
temperature. Then, an excessive amount of soot can be accumulated in the CDPF.
This case is much worse than the simple over-load of the CDPF. To inform this to the driver,
the engine warning lamp comes on and the engine power is decreased to protect the
system.
To solve this problem, blow soot between the engine and exhaust system several times and
erase the related DTC. Then, check if the same DTC is regenerated again. If so, check the
DTC related to the differential pressure sensor. 1.
2.
3.

14-8
Differential pressure
sensor
Calculates the amount of
PM collected by reading
the pressure difference
between before and after
the CDPF.Engine ECU
DCM 3.7
Post-injectionThrottle
valve
Regulates the rate of air
intake.
CDPF
DOC+DPFFront temperature sensor
Protects the
turbocharger.
Rear temperature sensor
Measures the
temperature of fuel
combustion.
2. COMPONENT
For details, refer to section "Engine Control". *

14-92412-02
3. INPUT/OUTPUT DEVICES
Front temperature sensor: This sensor is installed at the inlet of DOC and detects whether
the DOC can burn (oxidize) the post-injected fuel or not.
Rear temperature sensor: This sensor is installed at the inlet of DPF and monitors that the
temperature of the exhaust gas is kept at 600℃. 1.
2.
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8a0088009500470089008c00470099008c008b009c008a008c>d. So the amount of fuel
post-injection is decreased.
<0070008d0047009b008f008c0047009b008c00940097008c00990088009b009c0099008c0047008b009900960097009a0047009c0095008b008c00990047005d005700570b4500530047009b008f008c004700990088009b008c00470096008d0047009900
8c008e008c0095008c00990088009b0090009600950047008a>an be decreased. So the
amount of fuel post-injection is increased. -
-
Differential pressure sensor: This sensor checks the amount of PM collected by calculating the
pressure difference between before and after the CDPF.
Electric throttle valve: This valve reduces the intake air flow to raise the temperature of the
exhaust gas when the CDPF is operating during idling. 3.
4.

14-10
4. POST-INJECTION AND AIR MASS CONTROL
A DPS (Differential Pressure Sensor) measures the pressure difference between before and after
the CDPF and detects whether the soot is collected in the CDPF or not. If PM is collected in the
CDPF (In this case the pressure difference between before and after the CDPF exceeds the
specified value. Normally, the system sends the signal when the driving distance becomes
approx. 600 to 1,200 km), the temperature of exhaust gas is increased and the post-injection is
started for regeneration. The amount of fuel post-injection is controlled by the exhaust gas
<009b008c00940097008c00990088009b009c0099008c00470094008c0088009a009c0099008c008b0047008900a00047009b008f008c00470099008c008800990047009b008c00940097008c00990088009b009c0099008c0047009a008c0095009a009600
99005500470070008d0047009b008f008c0047009b008c0094>perature is less than 600℃, the
amount of post-injection is increased to increase the regeneration temperature. Otherwise, the
fuel injection amount is decreased or the fuel is not injected.
When the engine is running with low load, the intake air amount is also controlled as well as fuel
injection amount. This function is used to increaser the combustion temperature by increasing the
amount of fuel post-injection with the lowest air amount within the specified control logic.

14-112412-02
Front temperature sensor
Measures the temperature of
exhaust gas.
This sensor is located at the rear
side of exhaust manifold and
monitors the temperature of
combusted gas to prevent the
exhaust system from overheating.
When the temperature gets
higher, this sensor cuts off the
fuel delivery and controls the EGR
to lower the temperature.Rear temperature sensor
Measure the outlet
temperature of DOC.
This sensor is located at
the rear side of DOC and
monitors the overheating of
CDPF and post injection
volume.
Engine ECU (D20DTR)
Differential pressure sensor
Measures the difference between
inlet and outlet pressures of
CDPF.
If the difference is higher than the
specified value when collecting
the PM, this makes the post
injection for forced recycling of
PM.
T-MAP sensorIntake air
mass
Measures
the
excessive
amount of
PM.
Boost
pressure/
temperature
Injector (C31)
Controls the post injection.
Electric throttle body
Controls the intake air
mass.
HFM sensor
Wide band
oxygen sensor

14-12
Collecting PM
→ Regeneration
The engine ECU detects the
amount of PM collected by
the information from the
temperature sensors and
differential pressure sensor.
When the soot is
accumulated, the engine ECU
performs post-injection to
increase the exhaust gas
temperature and burns the
collected PM at approx.
600°C.Oxidation (DOC)
When the exhaust gas enters
into the CDPF assembly, its
CO, HC and PM are reduced
by the redox reaction of the
DOC. The remaining PM is
filtered and collected in
CDPF, and the temperature of
the exhaust gas is increased
to between 450 and 500°C.
5. OPERATING PROCESS
[Configuration and principle of operation]
The exhaust gas
passed through the
exhaust manifold
enters into the CDPF
assembly (at approx
250℃).

14-152412-02
3) PM Regeneration of DPF
The differential pressure sensor installed in the DPF measures the pressure values of inlet and
outlet of CDPF. And the amount of the PM collected in the filter is calculated based on the exhaust
temperature, intake air mass flow, booster pressure, etc.
The regeneration is started when the amount of the collected PM is 28 g or more.
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940097008c00990088009b009c0099008c00470096008d0047>CDPF to 600℃.
When the amount of the collected PM is not enough: The DPF works as a filter. 1.
When enough amount of PM is collected: The ECU commands post-injection and increase the
exhaust gas temperature to start regeneration. 2.

15-4
Glow plug
Differential pressure
sensor
Camshaft position
sensor
1. MAJOR COMPONENTS
Rear EGT sensor
Oxygen sensor
Front EGT sensor
HFM (air mass/
temperature)
Injector (C3I)
Variable swirl valve
actuator
IMV

15-70000-00
Fuel rail pressure
sensor
(2) Components for ECU Input
CAN
- ABS & ESP
- GCU
- Instrument
cluster
- TCUSwirl valve position
sensor
Differential
pressure sensorE-EGR valve
position sensorCamshaft position
sensorCoolant
temperature senso
r
Exhaust gas
temperature senso
r
HFM sensorOxygen sensorT-MAP sensor
Crankshaft position
sensor
Accelerator pedal
sensorThrottle position
sensorKnock sensor
-Auto cruise switch
- Rear right wheel
speed (without ABS)
- Refrigerant pressure
sensor
- Clutch pedal signal
- Blower switch signal
- Brake pedal signal
Water sensor