The HVAC Scan Tool Data Definitions contain a brief description of all the scan tool parameters. This list is in alphanumeric order.

Heating and Air Conditioning -- Data -- Desired Blower Mtr Speed: The scan tool displays 0-111 counts. When the blower motor is commanded off the scan tool displays 0. When the blower motor controls are placed in the maximum speed setting the scan tool displays 111 counts.

Heating and Air Conditioning -- Data -- Driver Temp Dial: The scan tool displays 15-32°C (59-89°F). The temperature displayed represents the position of the driver's temperature dial.

Heating and Air Conditioning -- Data -- Inside Temp Sensor: The scan tool displays 0-5 volts. The voltage displayed represents the inside air temperature sensor signal to the HVAC control module.

Heating and Air Conditioning -- Data -- LH Mix Mtr Position Feedback: The scan tool displays 0-225 counts. The counts displayed represent the position of the left air temperature actuator.

Heating and Air Conditioning -- Data -- LH Mix Mtr Position Requested: The scan tool displays 0-225 counts. The counts displayed represent the commanded position of the left air temperature actuator.

Heating and Air Conditioning -- Data -- Mix Motor State : When the left and right air temperature actuators are operating properly, the scan tool displays Normal.

Heating and Air Conditioning -- Data -- Outside Temp Sensor : The scan tool displays 0-5 volts. The voltage displayed represents the value of the outside air temperature sensor signal.

Heating and Air Conditioning -- Data -- Passenger Temp Dial : The scan tool displays 80-176 counts. The counts displayed represent the position of the PASSENGER temperature dial, 80 being the coolest setting and 176 the warmest.

Heating and Air Conditioning -- Data -- RH Mix Mtr Position Feedback: The scan tool displays 0-225 counts. The counts displayed represent the position of the right air temperature actuator.

Heating and Air Conditioning -- Data -- RH Mix Mtr Position Requested: The scan tool displays 0-225 counts. The counts displayed represent the commanded position of the right air temperature actuator.

Heating and Air Conditioning -- Data -- Sun Load Sensor: The scan tool displays 0-5 volts. The voltage displayed represents the value of the sunload sensor signal.

Heating and Air Conditioning -- Data -- Vacuum Solenoid 1: The scan tool displays On or Off. When the Vacuum Solenoid 1 is energized the scan tool displays On. When the solenoid is de-energized the scan tool displays Off.

Heating and Air Conditioning -- Data -- Vacuum Solenoid 2: The scan tool displays On or Off. When the Vacuum Solenoid 2 is energized the scan tool displays On. When the solenoid is de-energized the scan tool displays Off.

Heating and Air Conditioning -- Data -- Vacuum Solenoid 3: The scan tool displays On or Off. When the Vacuum Solenoid 3 is energized the scan tool displays On. When the solenoid is de-energized the scan tool displays Off.

Heating and Air Conditioning -- Data -- Vacuum Solenoid 4: The scan tool displays On or Off. When the Vacuum Solenoid 4 is energized the scan tool displays On. When the solenoid is de-energized the scan tool displays Off, and the Air Inlet Valve Vacuum Actuator is in the outside air position.

Heating and Air Conditioning -- Data -- Vacuum Solenoid 5: The scan tool displays On or Off. When the Vacuum Solenoid 5 is energized the scan tool displays On. When the solenoid is de-energized the scan tool displays Off.

Heating and Air Conditioning -- Inputs -- Auto Button: The scan tool displays Off or On. When the AUTO button is pressed the scan tool displays On. When released, the scan tool displays Off.

Heating and Air Conditioning -- Inputs -- Economy Button: The scan tool displays Off or On. When the Economy button is pressed the scan tool displays On. When released, the scan tool displays Off.

Heating and Air Conditioning -- Inputs -- Fan Down Button: The scan tool displays Off or On. When the Blower Speed Control Down button is pressed the scan tool displays On. When released, the scan tool displays Off.

Heating and Air Conditioning -- Inputs -- Fan Up Button: The scan tool displays Off or On. When the Blower Speed Control Up button is pressed the scan tool displays On. When released, the scan tool displays Off.

Heating and Air Conditioning -- Inputs -- Front Defrost Button: The scan tool displays Off or On. When the Front Defrost button is pressed the scan tool displays On. When released, the scan tool displays Off.

Heating and Air Conditioning -- Inputs -- Mode Button: The scan tool displays Off or On. When the MODE button is pressed the scan tool displays On. When released, the scan tool displays Off.

Heating and Air Conditioning -- Inputs -- Off Button: The scan tool displays Off or On. When the Off button is pressed the scan tool displays On. When released, the scan tool displays Off.

Heating and Air Conditioning -- Inputs -- Outside Air Button: The scan tool displays Off or On. When the Outside Air button is pressed the scan tool displays On. When released, the scan tool displays Off.

Heating and Air Conditioning -- Inputs -- Recirculate Button: The scan tool displays Off or On. When the Recirculation button is pressed the scan tool displays On. When released, the scan tool displays Off.

Heating and Air Conditioning -- Module Information -- Calibration ID: The scan tool displays the Calibration ID number for service identification.

Heating and Air Conditioning -- Module Information -- Rom ID: The scan tool displays the ROM ID number for service identification.

Heating and Air Conditioning -- Module Information -- ROM Part Number: The scan tool displays the ROM part number for service identification.

PCM -- A/C High Side Pressure: The scan tool displays 0 to 4000 kPa (0 to 580 psi). This parameter represents the A/C refrigerant pressure sensor voltage signal converted to pressure.

PCM -- A/C High Side Pressure: The scan tool displays 0.00-5.00 Volts. This parameter represents the A/C refrigerant pressure sensor signal.

PCM -- A/C Off For WOT: The scan tool displays Yes or No. Yes indicates that the PCM has disabled the A/C compressor because the TP sensor signal is at wide open throttle.

PCM -- A/C Pressure Disable: The scan tool displays Yes or No. Yes indicates that the PCM has disabled the A/C compressor due to excessive refrigerant pressure.

PCM -- A/C Relay Commanded: The scan tool displays On or Off. Represents the PCM commanded state of the A/C compressor clutch relay. The A/C compressor clutch should be engaged when Commanded A/C displays On.

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 -- ECT Sensor: The scan tool displays -40 to +215°C ( -40 to +420°F). The powertrain control module (PCM) applies 5.0 volts to the ECT sensor circuit. The sensor is a thermistor which changes internal resistance as the engine temperature changes. When the sensor is cold, internal resistance is high, the PCM senses a high volage signal and interprets the voltage as a cold engine. As the sensor warms, internal resistance decreases, the voltage signal decreases, and the PCM interprets the lower voltage as a warm engine.