Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1995BERETTA L4-2.2L VIN 4REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSA/C SIGNALDESCRIPTION AND OPERATIONA/C REFRIGERANT PRESSURE SENSOR
1995 Chevrolet Beretta L4-2.2L VIN 4
A/C Refrigerant Pressure Sensor
1995 Chevrolet Beretta L4-2.2L VIN 4SECTION 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.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.