9-3 (9440) L4-2.0L Turbo (2.0 T) (2006)
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Refrigerant Pressure Sensor / Switch: Description and Operation
Pressure Sensor, A/C (620)
Principal use
The value is used by ECM for load compensation based on the A/C compressor's load on the engine. Also used for radiator fan logic and block
conditions (pressure monitor) in the A/C system.
Type
The pressure sensor contains two metal plated ceramic discs mounted in close proximity. The disc located closest to the pressure connection is thinner
and bends when subjected to pressure. By this means, capacitance between the metal plating of the discs is changed based on the pressure. A circuit
integrated in the sensor converts the capacitance to an analogue voltage.
