SsangYong Rodius (2013 year). Service 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