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Home >> Chevrolet >> 1995 >> Beretta L4-2.2L VIN 4 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> A/C Signal >> Description and Operation >> A/C Refrigerant Pressure Sensor
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A/C Refrigerant Pressure Sensor




PURPOSE
The Air Conditioning refrigerant pressure sensor provides a signal to the Powertrain Control Module (PCM) which indicates varying high side refrigerant pressure between approximately 0 kPa and 3103 kPa (0 psi and 450 psi).

OPERATION
The PCM uses this input to determine A/C compressor load on the engine to help control idle speed with Idle Air Control (IAC) valve.

The A/C refrigerant pressure sensor electrical circuit consists of a 5 volt reference line, a ground line, and a signal line to the PCM. The signal is a voltage that varies from approximately 0.1 volt at 0 kPa (0 psi), to 4.9 volts at 3103 kPa (450 psi) or more. A problem in the A/C refrigerant pressure circuits or sensor should set a Diagnostic Trouble Code (DTC) 66 and will make the A/C compressor clutch inoperative.



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