SsangYong Stavic / SsangYong Rodius (2005 year). Manual — part 99
DI03-9
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AFFECTED VIN
INTAKE SYSTEM
DI ENG SM - 2004.9
<Structure of CI type HFM sensor>
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
DI03-10
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AFFECTED VIN
INTAKE SYSTEM
DI ENG SM - 2004.9
<Circuit diagram of HFM sensor>
Power supply
Intake air
f l o w
sensor
Intake air temperature
sensor
HFM sensor
Signal
Ground
Ground
DI03-11
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AFFECTED VIN
INTAKE SYSTEM
DI ENG SM - 2004.9
HFM sensor
HFM Sensor - Removal and Installation
Preceding Work: Disconnection of negative battery cable
1. Disconnect the HFM sensor connector.
2. Loosen the clamps on the air cleaner and the turbo
charger and remove the duct.
3. Unscrew the bolts and remove the HFM sensor assembly.
Installation Notice
Tightening torque
4 ~ 5 Nm
4. Install the reverse order of removal.
DI03-12
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EFFECTIVE DATE
AFFECTED VIN
INTAKE SYSTEM
DI ENG SM - 2004.9
INTERCOOLER
The turbo charger is designed to improve the engine power by introducing more air (oxygen) into the engine. However,
the intake air is heated (100 ~ 110°C) during the compression process in turbo charger compressor and the density is
lowered.
The intercooler is the device which cools (50 ~ 60°C) the air entering the engine. Colder air has more oxygen molecules
than warm air. Thus cooler air gives more power and better fuel economy.
1. Intercooler
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