A/C Refrigerant Pressure Sensor Description

The electronic A/C refrigerant pressure sensor is mounted to the line between the condenser and the evaporator. The output to the PCM is variable and depends on the pressure inside the line.

A higher pressure will result in a higher voltage out. The PCM constantly monitors the A/C system pressure in order to achieve the following effects:
^ Disengage the A/C clutch if the pressure is above 2700 kPa (440 psi).
^ Disengage the A/C clutch if pressure is below 285 kPa (38 psi).
^ Boost the idle air control in order to compensate for the A/C load at idle.
^ Control the cooling fan operation. Replace the pressure sensor if it fails. It is not repairable.