SsangYong Rodius (2013 year). Manual - part 91

15-35

0000-00

HFM (intake air 

temperature)

CDPF

Electric throttle 

body

Coolant 

temperature 

sensor

Oxygen sensor

Injector (C3I)

E-EGR valve

(11) Wide band oxygen sensor control

A. Overview

For diesel engine, combustion is not performed at the optimum (theoretically correct) air-fuel ratio and 

the oxygen concentration is thin in most cases. So the wide-band oxygen sensor is used for this kind of 

engine, and this sensor is a little different from the one that used for gasoline engine. The combustion 

in diesel engine is controlled by fuel injection volume. Therefore, the wide band oxygen sensor should 

be used in diesel engine. This sensor measures the air-fuel ratio in very wide range, and is also called 

full range oxygen sensor.

The wide band oxygen sensor measures the oxygen density in exhaust gas and sends it to ECU 

to control the EGR more precisely.

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B. Components

D20DTR ECU

15-36

C.  Input/Output for oxygen sensor

15-37

0000-00

D. Oxygen sensor control

The wide band oxygen sensor uses ZnO2. It produces the voltage by movement of oxygen ions when 

there is oxygen concentration difference between exhaust gas and atmosphere.

If a certain voltage is applied to the sensor, the movement of oxygen ions occurs regardless of the 

oxygen density. The current generated through this flow of ions, is called pumping current (IP), and the 

oxygen sensor measures this value.

15-38

Relay box

A/C 

compressor

HFM (intake air 

temperature)

Cooling fan 

module

MB 5 A/T (ATF 

temperature)

Coolant 

temperature 

sensor

(12) Cooling fan control

A. Overview of cooling fan and A/C compressor

The cooling system maintains the engine temperature at an efficient level during all engine operating 

conditions. The water pump draws the coolant from the radiator. The coolant then circulates through 

water jackets in the engine block, the intake manifold, and the cylinder head. When the coolant 

reaches the operating temperature of the thermostat, the thermostat opens. The coolant then goes 

back to the radiator where it cools. The heat from automatic transmission is also cooled down through 

the radiator by circulating the oil through the oil pump. ECU controls the electric cooling fans with three 

cooling fan relays to improve the engine torque and air conditioning performance.

For detailed information, refer to Chapter "Air Conditioning System".

B. Components

D20DTR ECU

Refrigerant