Transducer, A/C Pressure: 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 receiver/drier. The internal resistance of the A/C pressure transducer changes in response to the pressures it monitors. The A/C pressure transducer will also disengage the A/C compressor clutch if the high side pressure drops below 110 kPa (16 psi) and will re-engage the clutch when the high side pressure rises above 221 kPa (32 psi). If the refrigerant pressure rises above 1655 kPa (240 psi), the Powertrain Control Module (PCM) will actuate the cooling fan. The A/C pressure transducer message to the PCM will also prevent the A/C compressor clutch from engaging when ambient temperatures are below about 4.5°C (40°F) due to the pressure/temperature relationship of the refrigerant.

A Schrader-type valve in the receiver/drier fitting permits the A/C pressure transducer to be removed or installed without disturbing the refrigerant in the A/C system.

The A/C pressure transducer is diagnosed using a scan tool. Refer to DTC INDEX (1 OF 2) or DTC INDEX (2 OF 2) .

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