SsangYong Rodius (2013 year). Service manual - part 94

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C. Input/Output for CDPF control

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Rear EGT sensor: 

Measure DPF temp

Diff. pres. sensor: 

Measure pressure 

between front side and 

rear side of CDPF

Electronic throttle 

body: Control intake 

air mass

ECU (DCM 3.7)

Injector: Control post 

injection

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.

Front EGT sensor: 

Measure DOC temp

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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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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Issue with normal engine oil

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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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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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Problems when using unspecified engine oil

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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