Refrigerant Pressure Sensor

WARNING: This page is about a different car, the 2018 Land Rover Discovery and 2017 Land Rover Discovery. However, it is still accessible from the selected car via links, so may be relevant.

The refrigerant pressure sensor provides the Automatic Temperature Control Module (ATCM) with a pressure input from the high-pressure side of the refrigerant system. The refrigerant pressure sensor is hardwired to the ATCM, which uses the signal to control operation of the A/C compressor through the Air Conditioning (A/C) compressor clutch relay in the Passenger Junction Box (PJB).

Additionally, the ATCM is able to increase the amount of re-circulated air, if it is required. The ATCM transmits the refrigerant high-pressure value over the High Speed (HS) Controller Area Network (CAN) comfort bus to the Powertrain Control Module (PCM). The signal goes via the Body Control Module/Gateway Module Assembly (BCM/GWM)) and the FlexRay circuit. The PCM calculates the additional load on the engine when the A/C compressor is working. For example, this signal is used as an input, for the idle speed control.