Corsica V6-3100 3.1L MFI VIN M (1994)
Refrigerant Pressure Sensor / Switch: Description and Operation
A/C Control Circuit Diagram
PURPOSE
The A/C pressure sensor provides a signal to the PCM which indicates varying high side refrigerant pressure between approximately 0.0 psi to 450
psi. The PCM uses this input to determine A/C compressor load on the engine to help control idle speed with the Idle Air Control (IAC) Valve.
OPERATION
The A/C pressure sensor electrical circuit consist of a 5.0 volt reference line, a ground, and a signal wire to the PCM. The signal is a voltage that
varies from approximately 0.1 volts at 0.0 psi to 4.6 volts at 450 psi or more. A problem with the A/C pressure circuits or sensor should set a Code
66, 70, or both, and the A/C compressor clutch will not operate.
