Air Conditioning (A/C) Compressor Torque
WARNING: This page is about a different car, the 2018 Jaguar XE and 2017 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
The ATCM calculates A/C compressor torque using the refrigerant pressure, the ambient air temperature and compressor solenoid current. The calculated torque is transmitted on the High Speed (HS) Controller Area Network (CAN) comfort systems bus to the Body Control Module/Gateway Module (BCM/GWM) assembly. The BCM/GWM assembly then transmits the message to the Powertrain Control Module (PCM) on the HS CAN powertrain systems bus.
Under extreme conditions the PCM sends a HS CAN powertrain systems bus message requesting the ATCM to limit A/C compressor torque. This causes the ATCM to reduce the solenoid current. If required, the ATCM reduces the A/C solenoid current to zero and then disengages the A/C compressor clutch.