SsangYong Stavic / SsangYong Rodius (2005 year). Service manual - part 99
DI03-9
CHANGED BY
EFFECTIVE DATE
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