Aztek V6-3.4L VIN E (2001)
Refrigerant Pressure Sensor / Switch: Description and Operation
A/C REFRIGERANT PRESSURE SENSOR
The A/C system is protected by the A/C refrigerant pressure sensor. The sensors' output to the PCM is variable and is dependent upon pressure inside the
line. A higher pressure results in a higher voltage output. The A/C pressure is constantly monitored in order to allow the A/C compressor clutch to
disengage as needed. If line pressures climb above 2979 kPa (432 psi), the PCM will turn off the A/C compressor clutch until the pressure lowers to
1510 kPa (219 psi). If line pressures fall below 186 kPa (27 psi), the PCM will turn off the A/C compressor clutch until the pressure raises to 207 kPa
(30 psi).
A 5-volt reference signal is sent out over the 5-volt reference circuit, from the PCM, to the A/C refrigerant pressure sensor. The PCM monitors the A/C
pressure by sending out a separate 5-volt signal on the A/C pressure sensor signal circuit. This circuit is how the PCM monitors HVAC pressures.
Ground for the A/C refrigerant pressure sensor is provided by the low reference circuit.
