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 Information -- A/C Clutch (Actual): The scan tool displays On or Off. On is displayed when the PCM has energized the A/C compressor clutch relay.

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.

PCM -- Engine Data 2 -- A/C Press. Out Of Range: The scan tool displays Yes or No. Yes is displayed when the system pressure exceeds 2968 kPa (430 psi).

PCM -- Output Driver Data -- A/C Relay: The scan tool displays OK or Fault. Fault is displayed when an open or short is detected in the A/C compressor clutch relay ground circuit.

PCM -- Engine Data 2 -- Commanded A/C: The scan tool displays On or Off. On is displayed when the PCM has energized the A/C clutch relay.