9-3 Arc/Aero (9440) L4-2.0L Turbo (2.0 T) (2004)
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Barometric Pressure Sensor: Description and Operation
Atmospheric Pressure Sensor (539), T8
Main task
The atmospheric pressure sensor informs the control module of the current atmospheric pressure. This is used to calculate smoke limitation. The higher
the car is above sea level, the less oxygen there is in the air. The fuel supply must therefore be reduced. Atmospheric pressure also affects turbo pressure,
which must be reduced at high altitudes so that the turbocharger does not overrev.
Type
The pressure sensor is a piezoresistive sensor with its own electronics for signal amplification and temperature compensation.
Connection
Pin No. 1-3
