Aurora V6-214 3.5L VIN H SFI (2001)
Refrigerant Pressure Sensor / Switch: Description and Operation
The A/C system is protected by the A/C refrigerant pressure sensor. The sensor is mounted on the discharge line of the A/C compressor hose
assembly. The sensor 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
2968 kPa (430 psi) or fall below 255 kPa (35 psi), the DIM will turn OFF the A/C compressor clutch.
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.
