Century L4-2.2L VIN 4 (1994)
Refrigerant Pressure Sensor / Switch: Description and Operation
A/C Refrigerant Pressure Sensor Circuit
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 4.9 volts at 450 psi or more. A problem with the A/C pressure circuits or sensor should set a Code
66 and will make the A/C compressor inoperative.
LOCATION:
Right hand front of engine, on A/C line.
