SsangYong Korando III (2010 year). Service manual - part 375

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c. Input/Output for CDPF control

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Rear temp. sensor: 
Measure DPF 
temp.

DPF performs 
recycling 
(combustion) 
process at 600C, 
and rear 
temperature sensor 
monitors the 
temperature of DPF.

Differential pressure 
sensor measures the 
pressure difference 
between pre-CDPF 
and post-CDPF (If 
PM has been 
accumulated, the 
measured value is 
over the specified 
value).

Diff. pres. sensor: 
Measure 
pressure between 
front side and 
rear side of CDPF

Injector: Control 
post injection

Front temp. 
sensor: Measure 
DOC temp.

DOC performs 
oxidation and 
reduction process at 
300~500˚C, and 
front temperature 
sensor monitors the 
temperature of 
DOC.

Electronic 
throttle body: 
Control intake air 
mass

ECU (DCM 3.7)

d. Operation process

When the differential pressure sensor detects the pressure difference between the front and the rear 

side of CDPF, the sensor sends signal indicating the soot is accumulated and the post injection is 

performed to raise the temperature of exhaust gas. The amount of fuel injected is determined according 

to the temperature of exhaust gas detected by the rear temperature sensor. If the temperature is below 
600°C, the amount of fuel injected is increased to raise the temperature. If the temperature is over 
600°C, the amount of fuel injected is decreased or not controlled. When the engine is running in 

low load range, the amount of post injection and the amount of intake air are controlled. It is to raise the 

temperature by increasing the amount of fuel while decreasing the amount of intake air.

T-MAP sensor

Intake air 

mass

Exceed  PM 

limit

Booster 

pressure/

temperature

Post injection

Control intake air 

mass

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e. Cautions

Use only specified Engine Oil (approved by MB Sheet 229.51) for CDPF.

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1. Use only specified engine oil (Low Ash Oil)

The vehicle equipped with CDPF should use specific engine oil to improve the engine performance 

and fuel economy, and ensure the service life of CDPF.

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2. Issue with normal engine oil

Sulfur, one of the contents of engine oil is burned and generates soot that is not regenerated by the 

DPF. This remains on the filter as ashes and keeps accumulating. Eventually, this ashes will block the 

filter.

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3. Benefit for specified engine oil

Minimized the sulfur content of engine oil which reduces the service life.

Improved fuel economy and emission level of CO2 with high performance and low viscosity.

Increased service life of engine oil with high resistance to temperature.

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-

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4.  Problems when using unspecified engine oil

The service life of filter may be reduced by 30% or more by the ashes accumulated on the filter.

The fuel economy may be reduced because of engine rolling resistance, frequent regeneration of 

DPF.

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These problems are also caused by oil with high sulfur content, such as tax exemption oil and 

heating oil, etc.

*

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3) Input/Output for CAN communication

(1) Configuration of CAN (P-CAN/B-CAN)

CAN Topology communicate with system units. There are two types (P-CAN and B-CAN) of 

communication according to the communication speed. Instrument cluster, BCM and diagnostic 

connector use both types of communication. And, ECU, ABS & ESP, TCU, GCU, E-coupling and EPS 

unit use P-CAN communication because it is faster than B-CAN. The terminal resistances are installed in 

ECU and BCM.

Abbreviation

Function

GCU

Glow Control Unit

EPS

Electronic Power Steering Unit

BCM

Body Control Module

SKM

Smart Key Module

TPMS

Tire Pressure Monitering System