Scan Tool Data Definitions. Buick Century 2001

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2001 🢒 Century 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 Scan Tool Data Definitions

Use the Scan Tool Data Display Values and Definitions Information in order to assist in diagnosing the HVAC Control Module problems. Compare the vehicles actual scan tool data with the typical data display value table information. Use the data information in order to aid in understanding the nature of the problem when the vehicle does not match with the typical data display values.

The scan tool data values were taken from a known good vehicle under the following conditions:

•	The ignition switch is in the ON position.

•	The engine is running at idle.

•	The vehicle is in PARK.

•	The doors are closed.

•	The windows are closed.

•	The A/C is ON, in UPPER mode.

•	The ambient air temperatures are at 22-27°C (70-80°F).

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.

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.

Calibration ID: The scan tool displays the Calibration ID number for service identification.

Desired Blower Mtr Speed: The scan tool displays 0-111 Counts. When the blower motor is OFF, the scan tool displays 0 Counts. When the blower motor controls are placed in the maximum speed setting, the scan tool displays 111 Counts.

Driver Temp Dial: The scan tool displays 15° to 32°C (59° to 89°F). The temperature displayed represents the desired system discharge temperature selected by the driver.

Driver Temp Down Button: The scan tool displays Off or On. When the DRIVER TEMP DOWN button is pressed the scan tool displays On. When released, the scan tool displays Off.

Driver Temp Up Button: The scan tool displays Off or On. When the DRIVER TEMP UP button is pressed the scan tool displays On. When released, the scan tool displays Off.

Dual Button: The scan tool displays Off or On. When the DUAL button is pressed the scan tool displays On. When released, the scan tool displays Off.

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.

Fan Up 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.

Front Defrost Button: The scan tool displays Off or On. When the FRONTDEFROST button is pressed the scan tool displays On. When released, the scan tool displays Off.

Inside Temp Sensor: The scan tool displays 0-5.0 Volts. The voltage displayed represents the inside air temperature sensor signal to the HVAC control module.

LH Mix Mtr Position Feedback: The scan tool displays 0-255 Counts. The counts displayed represent the position of the left air temperature actuator.

LH Mix Mtr Position Requested: The scan tool displays 0-255 Counts. The counts displayed represent the commanded position of the left air temperature actuator.

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

Mode Down Button: The scan tool displays Off or On. When the MODE DOWN button is pressed the scan tool displays On. When released, the scan tool displays Off.

Mode Up Button: The scan tool displays Off or On. When the MODE UP button is pressed the scan tool displays On. When released, the scan tool displays Off.

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.

Outside Temp Sensor: The scan tool displays 0-5.0 Volts. The voltage displayed represents the value of the outside air temperature sensor signal.

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 being the warmest.

Passenger Temp Down Button: The scan tool displays Off or On. When the PASSENGER TEMP DOWN button is pressed the scan tool displays On. When released, the scan tool displays Off.

Passenger Temp Down Button: The scan tool displays Off or On. When the PASSENGER TEMP UP button is pressed the scan tool displays On. When released, the scan tool displays Off.

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 -- 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 0.00-5.00 Volts. This parameter represents the A/C refrigerant pressure sensor signal.

PCM -- Engine Data 2 -- A/C Off for WOT: The scan tool displays Yes or No. Yes is displayed when the PCM de-energizes the A/C compressor clutch relay to reduce engine load during wide open throttle.

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

PCM -- Engine Data 2 w/LG8 (V6) -- A/C Request Signal: The scan tool displays Yes or No. Yes is displayed when the HVAC Control Module is requesting A/C system operation.

PCM -- Output Driver Data -- A/C Relay Circuit Status: 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.

Rear Defrost Button: The scan tool displays Off or On. When the REAR DEFROST button is pressed the scan tool displays On. When released, the scan tool displays Off.

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.

RH Mix Mtr Position Feedback: The scan tool displays 0-255 Counts. The counts displayed represent the position of the right air temperature actuator.

RH Mix Mtr Position Requested: The scan tool displays 0-226 Counts. The counts displayed represent the commanded position of the right air temperature actuator.

Rom ID: The scan tool displays the Rom ID number for service identification.

ROM Part Number: The scan tool displays the ROM part number for service identification.

Sun Load Sensor: The scan tool displays 0-5.0 Volts. The voltage displayed represents the value of the sunload sensor signal.

Vacuum Solenoid 1: The scan tool displays On or Off. When Vacuum Solenoid 1 is energized the scan tool displays On. When the solenoid is de-energized the scan tool displays Off.

Vacuum Solenoid 2: The scan tool displays On or Off. When Vacuum Solenoid 2 is energized the scan tool displays On. When the solenoid is de-energized the scan tool displays Off.

Vacuum Solenoid 3: The scan tool displays On or Off. When Vacuum Solenoid 3 is energized the scan tool displays On. When the solenoid is de-energized the scan tool displays Off.

Vacuum Solenoid 4: The scan tool displays On or Off. When 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.

Vacuum Solenoid 5: The scan tool displays On or Off. When Vacuum Solenoid 5 is energized the scan tool displays On. When the solenoid is de-energized the scan tool displays Off.

PCM--3.1L

ECT Sensor: The scan tool displays a range of -40 to 151°C (-40 to 304°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.

PCM--3.8L

ECT Sensor: The scan tool displays a range of 40 to 151°C (40 to 304°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.