SsangYong Rexton. Manual - part 43

DI03-6

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

INTAKE SYSTEM

DI ENG SM - 2004.4

Air Cleaner Element - Replacement

Preceding Work: Disconnection of negative battery cable

1. Disconnect the HFM sensor connector.

2. Loosen the locking clamp and remove the intake duct.

3. Unscrew the screws and remove the air cleaner cover.

4. Remove the air cleaner element. Clean or replace the

element as required.

Y220_03004

Y220_03005

Y220_03006

DI03-7

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

INTAKE SYSTEM

DI ENG SM - 2004.4

1. Check the air cleaner body, cover and packing for

deformation, corrosion and damage.

2. Check the air duct for damage.

Air Cleaner Housing/Element - Check

3. Check the air cleaner element for clogging, contamination

and damage. If the element is partially clogged, remove
the dust or foreign materials with the compressed air. If
the contamination is severe, replace it with new one. Also,
be careful not to contaminate during the replacement.

4. Check the air cleaner housing for clogging, contamination

and damage.

5. If the inside of housing is contaminated, remove the

contaminants.

Air Cleaner Housing
- Removal and Installation

Preceding Work: Removal of air cleaner cover

1. Set aside the return hose and remove the coolant reservoir

bolts.

2. Remove the air cleaner housing bolts.

3. Install in the reverse order of removal.

Y220_03007

Y220_03008

Y220_03009

Y220_03010

Notice

When cleaning the air cleaner with compressed air,
direct the air from inside (engine) to outside (ambient
air). Otherwise, contaminants can get into the engine.

DI03-8

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

INTAKE SYSTEM

DI ENG SM - 2004.4

<CI type HFM sensor structure>

Y220_03011

AIR FLOW SENSOR (HOT FILM AIR MASS SENSOR)

1. Plug-in sensor

2. Cylinder housing

3. Protection grid

4. Hybrid cover

5. Measuring duct cover

6. Housing

7. Hybrid

8. Sensor

9. Mounting plate

10. O-ring

11. Temperature sensor

Air flow sensor is locating on the air intake passage between air cleaner and intake manifold and measures air volume
flows to engine combustion chamber and intake air temperature.

And intake temperature sensor built-in the sensor detects intake temperature.

Internal circuit of the air flow sensor is being used to control the voltage value to control the temperature to maintain the
heating resistance (Rh) to 160°C that is higher temperature than intake air temperature that is measured by resistance
(RI).

Temperature sensor of the heating resistance (Rh) is measured by resistance (Rs).

If temperature changes occur due to increasing/decreasing intake air volume, voltage of the heating resistance changes
to maintain the intake air temperature changes to set value (160°C).

Control unit computes intake air volume based on voltage changes of heating resistance.

Intake air temperature is measured by NTC integrated in the sensor.

Change history

inner tube added + grid (No.3)
added + sensing chip changed +
sensing section design changed

Results

Durability has enhanced 60
times (lab test results)

DI03-9

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

INTAKE SYSTEM

DI ENG SM - 2004.4

<Structure of CI type HFM sensor>

Y220_03012

Intake air temperature sensor is a part of HFM sensor and a thermister and resister and detects air temperature
changes that flow into the engine. There occurs high resistance when temperature is low and low resistance when high
(NTC type).

ECU supplies 5 V to intake air temperature sensor and then measures voltage changes to determine the intake air
temperature. When air in the intake manifold is cold, the voltage is high and air is hot, the voltage is low.

The reason for using HFM sensor is that this sensor is most proper in controlling accurate air-fuel ratio to meet the legal
emission regulations. This sensor measures actual intake air mass into engine very accurately during specific instant
acceleration and deceleration, and determines engine loads and detects intake air pulsation and air flows.

Main functions of HFM sensor are:

• Using for EGR feedback control

• Using for turbocharger booster pressure control valve control

• Using for fuel injecting compensation

CI type HFM sensor: The air flowing the sensor does not directs toward sensing section but flows along with lower wall
after passing protection grid to enhance durability of the sensor. Oil, water and dust less damage the sensor.

Air outlet

Air inlet