Front A/C Pressure Transducer - Operation

OPERATION

The A/C pressure transducer monitors the pressures in the high side of the refrigerant system through its connection to a fitting on the A/C liquid line. The A/C pressure transducer will change its internal resistance in response to the pressures it monitors. A Schrader-type valve in the liquid line fitting permits the A/C pressure transducer to be removed or installed without disturbing the refrigerant in the A/C system.

The Powertrain Control Module (PCM) provides a 5 volt Direct Current (DC) reference signal and a sensor ground to the A/C pressure transducer, then monitors the output voltage of the A/C pressure transducer on a sensor return circuit to determine refrigerant pressure. The PCM is programmed to respond to the A/C pressure transducer and other sensor inputs and control the operation of the A/C compressor and the radiator cooling fan, to help optimize A/C system performance, and to protect the A/C system from damage.

The A/C pressure transducer is diagnosed and tested using a scan tool Testing and Inspection.

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