Transducer, A/C Pressure: Operation

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

The A/C pressure transducer is connected to a 5 volt supply voltage, provides a signal return to the Powertrain Control Module (PCM) or Engine Control Module (ECM), and is provided ground through the PCM/ECM. Utilizing sensing elements and internal electronics, it creates a voltage signal that is proportional to the refrigerant pressure in the liquid line of the A/C system. This voltage is received by the PCM/ECM, where it is converted to a pressure value, and broadcasts the information from the PCM/ECM over the Controller Area Network - Chassis (CAN-C) bus for use by the other modules.

The PCM/ECM is programmed to respond to this and other sensor inputs to control the operation of the A/C compressor and the radiator cooling fan in order to optimize A/C system performance, and to protect the system components from damage. The PCM will not operate the A/C compressor if there are any A/C pressure transducer circuit faults detected.

The A/C pressure transducer is factory calibrated and cannot be adjusted or repaired and must be replaced if inoperative or damaged.