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 2968 kPa (430 psi) or fall below 224 kPa (32 psi), the PCM will turn off the A/C compressor clutch. When high side pressures lower to 1386 kPa (201 psi) and low side pressures rise to 238 kPa (35 psi), DIM will allow compressor operation.

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 monitoring the voltage fluctuation on the A/C pressure sensor signal circuit. Ground for the A/C refrigerant pressure sensor is provided by the sensor return circuit.