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Scan Tool Data Definitions



Scan Tool Data Definitions

A/C Disengage Reason
- The scan tool displays one of the following reasons why the powertrain control module (PCM) or engine control module (ECM) has disengaged the A/C compressor; None, System Voltage, WOT, CKP, Learn Active, Engine Run Time, Coolant Hot, Anti Stall, A/C Pressure, Engine Speed, Trans Engine Speed, A/C Pressure Sensor, Low Voltage, High Voltage, Outside Air, Temp, A/C Switched Off.

A/C High Side Pressure Sensor
- The scan tool displays 0-3450 kPa (0-500 psi). The voltage applied to the PCM/ECM input from the A/C refrigerant pressure sensor is converted to a pressure value.

A/C High Side Pressure Sensor
- The scan tool displays 0-5 volts. The voltage applied to the PCM/ECM input for the A/C refrigerant pressure sensor.

A/C LED
- The scan tool displays the On/Off status of the A/C request LED showing status of A/C engagement.

A/C Off for WOT
- The scan tool displays the high throttle disable of the A/C compressor.

A/C Pressure Disable
- The scan tool displays the status of the A/C high side pressure sensor. The scan tool displays Active/Inactive.

A/C Relay Command
- The scan tool displays On/Off. The scan tool displays the control decision for the compressor clutch relay output as determined by the PCM/ECM.

A/C Relay Circuit History
- The scan tool displays the following message stating the history status of the A/C relay control circuit. The scan tool displays OK/Open/Short.

A/C Relay Circuit Status
- The scan tool displays the following message stating the present status of the A/C relay control circuit. The scan tool displays OK/Fault.

A/C Request Signal
- The scan tool displays Yes/No. The scan tool displays Yes when the PCM/ECM receives a message to engage the A/C compressor clutch. The scan tool displays No when the PCM/ECM receives a message to disengage the A/C compressor clutch.

A/C Request Switch
- The scan tool displays On/Off. The A/C request switch shows current status of the A/C request switch function on the HVAC control module.

Ambient Air Temperature Sensor
- The scan tool displays -40 to 87.5°C (-40 to 189.5°F). The current value of the ambient air temperature sensor.

Ambient Light Sensor
- The scan tool displays 0-1023 counts (0-5.00 volts). The voltage applied to the ambient light sensor input of the BCM.

A/C Switch
- The scan tool displays the current status of the A/C switch engagement at the HVAC control head. The scan tool displays Active/Inactive.

Auto Mode
- The scan tool displays the current status of the A/C auto mode engagement at the HVAC control head. The scan tool displays On/Off.

Battery Voltage Signal
- The scan tool displays the level of battery voltage at the HVAC control module. The scan tool displays 0 - 12 V.

Blower Motor Speed Command
- The scan tool displays 0-100%. The scan tool displays the control decision for the blower motor speed as determined by the HVAC control module. The scan tool displays 100% when the blower motor is commanded to maximum speed. The scan tool displays 0% when the blower motor is commanded OFF.

ECT Sensor
- The scan tool displays -40 to 215°C (-40 to 419°F). The voltage applied to the PCM/ECM input from the engine coolant temperature sensor is converted to a temperature value.

FC Relay 1 Command
- The scan tool displays the command status of the PCM/ECM to relay 1. The scan tool displays On/Off.

FC Relay 2 and 3 Command
- The scan tool displays the command status of the PCM/ECM to relays 2 and 3. The scan tool displays On/Off.

Ignition 1 Signal
- The scan tool shows available voltage at the PCM/ECM. The scan tool displays 0-2 V.

Inside Air Temp. Sensor
- The scan tool displays -40 to 185°C (-40 to 365°F). The voltage applied to the HVAC control module input for the inside air temperature sensor is converted to a temperature value.

Lower Duct Air Temp. Sensor
- The scan tool displays 0-255 counts (0-5.00 volts). The voltage applied to the HVAC control module from the lower duct air temperature sensor.

Mode Dr. Position
- The scan tool displays 0-255 counts (0-5.00 volts). The voltage applied to the mode door position input of the HVAC control module.

Mode Dr. Motor Commanded
- The scan tool displays 0-255 counts (0-5.00 volts). The desired position of the mode actuator as determined by the HVAC control module.

Mode Status
- The scan tool displays the HVAC control module command of Def/Defog/Panel/Bi-level/Floor/Auto mode status.

Outside Air LED
- The scan tool displays the command status of the HVAC control module Outside Air switch LED. The scan tool displays On/Off.

Outside Air Mode Switch
- The scan tool displays the command status of the HVAC control module outside air mode switch. The scan tool displays On/Off.

Recirculation LED
- The scan tool displays the current status of the recirculation actuator LED. The scan tool displays On/Off.

Recirculation Dr. Motor Command
- The scan tool displays 0-255 counts (0-5.00 volts). The voltage applied to the recirculation door command input of the HVAC control module.

Recirculation Dr. Position
- The scan tool displays 0-255 counts (0-5.00 volts). The desired position of the recirculation actuator as determined by the HVAC control module.

Recirculation Switch
- The scan tool displays the command status of the HVAC control module recirculation switch. The scan tool displays Active/Inactive.

Sunload Sensor
- The scan tool displays 0-255 counts (0-5.00 volts). The voltage applied to the sunload input of the HVAC control module.

Temp Dr. Motor Command
- The scan tool displays 0-255 counts (0-5.00 volts). The voltage applied to the air temperature door command input of the HVAC control module.

Temp Dr. Motor Position
- The scan tool displays 0-255 counts (0-5.00 volts). The desired position of the air temperature actuator as determined by the HVAC control module.

Temp Down Switch
- The scan tool displays the command status of the HVAC control module temperature switch. The scan tool displays Active/Inactive.

Temp Up Switch
- The scan tool displays the command status of the HVAC control module temperature switch. The scan tool displays Active/Inactive.

Upper Duct Air Temp. Sensor
- The scan tool displays 0-255 counts (0-5.00 volts). The voltage applied to the HVAC control module from the upper duct air temperature sensor.

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