The HVAC Scan Tool Data Definitions contains a brief description of all HVAC related parameters available on the scan tool. The list is in alphabetical order. A given parameter may appear in any one of the data lists. In some cases, the parameter may appear more than once or in more than one data list in order to group certain related parameters together.

PCM -- A/C Clutch Feedback Signal: The scan tool displays On or Off. Represents the state of the A/C compressor clutch feedback circuit.

PCM -- A/C Relay Command: The scan tool displays On or Off. On is displayed when the PCM has energized the A/C compressor clutch relay.

PCM -- A/C Request Signal: The scan tool displays Yes or No. The PCM uses the A/C request signal in order to determine if A/C compressor operation is being requested by the HVAC control module.

PCM -- Engine Data 2 -- A/C High Side Pressure: The scan tool displays -103 to +3119 kPa (-14 to +452 psi). This parameter represents the A/C refrigerant pressure sensor voltage signal converted to pressure.

PCM -- Engine Data 2 -- A/C High Side Pressure: The scan tool displays 0 to 5 volts. The output of the A/C refrigerant pressure sensor.