Refrigerant Pressure Sensor
WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
The refrigerant pressure sensor converts high-pressure side refrigerant pressure into voltage and outputs it to ECM. The ECM operates cooling system protection and idle speed control according to the voltage value that is inputted.
The refrigerant pressure sensor is a capacitance type sensor. It consists of a pressure detection area and a signal processing area. The pressure detection area, which is a variable capacity condenser, changes internal static capacitance according to pressure force. The signal processing area detects the static capacitance of the pressure detection area, converts the static capacitance into a voltage value, and transmits the voltage value to the ECM.