Circuit Description

A/C refrigerant pressure sensor responds to changes in A/C refrigerant high side pressure. Powertrain Control Module (PCM) supplies and monitors 5-volt reference circuit to the pressure sensor. Pressure sensor operating range is 0-450 psi. At zero psi, signal voltage should be about .1 volt. At 450 psi or more, signal voltage should be about 4.9 volts.