SSANGYONG KYRON 2010.01 Manual page 274

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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:
1. Using for EGR feedback control
2. Using for turbocharger booster pressure control valve control
3. 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.
ENGINE D20DT
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<Structure of CI type HFM
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