Mazda CX-5 Service & Repair Manual: Refrigerant Pressure Sensor [Full Auto Air Conditioner]

Purpose

• The refrigerant pressure sensor detects the refrigerant pressure in the refrigerant cycle.

Function

• The refrigerant pressure sensor converts the detected refrigerant pressure to an electric signal and sends it to the PCM.

  

  
  

Construction

• The refrigerant pressure sensor is installed on the cooler pipe.

  

  
  

• A capacitance type refrigerant pressure sensor, which converts refrigerant pressure into a linear electric signal, has been adopted.

• Consists of a pressure detecting part and signal processing part.

• The pressure detecting part is a variable capacity condenser, which changes capacitance according to the pressure.

• The signal processing part detects the capacitance of pressure detecting part, converts it to voltage, then outputs it to the climate control unit.

Operation

Capacitance type

• There is a clearance between the movable ceramic diaphragm and the ceramic base, and each side has an electrode.

• When pressure is applied from the ceramic diaphragm side, the ceramic diaphragm deforms, and the clearance between the electrodes changes. As a result, capacitance is changed and pressure is detected.

  

  
  

Fail-safe

• Function not equipped.