Scan Tool Data Definitions

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

HVAC - Primary ECC Data - Outside Air Temp: The scan tool displays -40 to +60°C (-40 to + 140°F). The output of the ambient air temperature sensor.

HVAC - Primary ECC Data - Inside Air Temp: The scan tool displays -40 to +60°C (-40 to + 140°F). The output of the inside air temperature sensor.

HVAC - Primary ECC Data - Upper Outlets Duct Temp: The scan tool displays -40 to + 150°C (-40 to +300°F). The output of the upper outlets duct temperature sensor.

HVAC - Primary ECC Data - Lower Outlets Duct Temp: The scan tool displays -40 to + 150°C (-40 to +300°F). The output of the lower outlets duct temperature sensor.

HVAC - Auxiliary ECC Data - Aux. Inside Air Temp: The scan tool displays -40 to + 150°C (-40 to +300°F). The output of the Aux. inside air temperature sensor.

HVAC - Auxiliary ECC Data - Aux. Upper Outlet Temp: The scan tool displays -40 to + 150°C (-40 to +300°F). The output of the Aux. Upper Outlet temperature sensor.

HVAC - Auxiliary ECC Data - Aux. Lower Outlet Temp: The scan tool displays -40 to +150°C (-40 to +300°F). The output of the Aux. Lower Outlet temperature sensor.

HVAC - Primary ECC Data - Solar Sensor: The scan tool displays 0-250 counts. The solar load output of the sunload sensor.

HVAC - Primary ECC Data - Blower Motor PWM Speed: The scan tool displays 0-98%.

HVAC -Auxiliary ECC Data - Auxiliary Blower Motor PWM: The scan tool displays 0-98%.

HVAC - Primary ECC Data - Mode Selection Position: The scan tool displays AUTO, Upper, Defog, Bi-Level, Heater or Defrost. The current operating mode of the HVAC system.

HVAC - Primary ECC Data - A/C Request: The scan tool displays Yes or No.

HVAC - Primary ECC Data - A/C LED On: The scan tool displays on or off.

HVAC - Primary ECC Data - Recirc LED: The scan tool displays on or off.

HVAC - Primary ECC Data - Outside Air LED: The scan tool displays on or off.

HVAC - Primary ECC Data - Rear Defog: The scan tool displays on or off.

HVAC - Primary ECC Data - Mode Door Actual: The scan tool displays 0-255 counts. The signal output from the feedback pot on the actuator.

HVAC - Primary ECC Data - Mode Door Commanded: The scan tool displays 0-255 counts. The desired position of the actuator.

HVAC - Primary ECC Data - Mode Door Max. Position: The scan tool displays 0-255 counts. The maximum travel range when driven to the door stop during a recalibration.

HVAC - Primary ECC Data - Mode Door Min. Position: The scan tool displays 0-255 counts. The minimum travel range when driven to the door stop during a recalibration.

HVAC - Auxiliary ECC Data - Aux. Mode Door Actual: The scan tool displays 0-255 counts. The signal output from the feedback pot on the actuator.

HVAC - Auxiliary ECC Data - Aux. Mode Door Commanded: The scan tool displays 0-255 counts. The desired position of the actuator.

HVAC - Auxiliary ECC Data - Aux. Mode Door Max. Position: The scan tool displays 0-255 counts. The maximum travel range when driven to the door stop during a recalibration.

HVAC -Auxiliary ECC Data - Aux. Mode Door Min. Position: The scan tool displays 0-255 counts. The minimum travel range when driven to the door stop during a recalibration.

HVAC - Primary ECC Data - Air Inlet Door Actual: The scan tool displays 0-255 counts. The signal output from the feedback pot on the actuator.

HVAC - Primary ECC Data - Air Inlet Door Commanded: The scan tool displays 0-255 counts. The desired position of the actuator.

HVAC - Primary ECC Data - Air Inlet Door Max.: The scan tool displays 0-255 counts. The maximum travel range when driven to the door stop during a recalibration.

HVAC - Primary ECC Data - Air Inlet Door Min.: The scan tool displays 0-255 counts. The minimum travel range when driven to the door stop during a recalibration.

HVAC - Primary ECC Data - Air Mix Door Actual: The scan tool displays 0-255 counts. The signal output from the feedback pot on the actuator.

HVAC - Primary ECC Data - Air Mix Door Commanded: The scan tool displays 0-255 counts. The desired position of the actuator.

HVAC - Primary ECC Data - Air Mix Door Max. Position: The scan tool displays 0-255 counts. The maximum travel range when driven to the door stop during a recalibration.

HVAC - Primary ECC Data - Air Mix Door Min. Position: The scan tool displays 0-255 counts. The minimum travel range when driven to the door stop during a recalibration.

HVAC - Auxiliary ECC Data - Aux. Mix Door Actual: The scan tool displays 0-255 counts. The signal output from the feedback pot on the actuator.

HVAC - Auxiliary ECC Data - Aux. Mix Door Commanded: The scan tool displays 0-255 counts. The desired position of the actuator.

HVAC - Auxiliary ECC Data - Aux. Mix Door Max. Position: The scan tool displays 0-255 counts. The maximum travel range when driven to the door stop during a recalibration.

HVAC - Auxiliary ECC Data - Aux. Mix Door Min. Position: The scan tool displays 0-255 counts. The minimum travel range when driven to the door stop during a recalibration.

HVAC - Miscellaneous Tests - Instant OAT Update: The scan tool displays Commanded State: The scan tool displays Commanded State: None or On. Updates the ECC outside air temperature input to the current raw value.

HVAC - Miscellaneous Tests - Blower Motor: The scan tool displays Commanded State: None, Off or On. This function allows you to command the blower motor to its maximum (100%) or minimum (0%) speeds.

HVAC -Special Functions - Set Up New HVAC: This function has the ECC relearn a new heater and A/C control.

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

PCM - Engine Data 1 - ECT: The scan tool displays -40 to +215°C (-40 to +420°F). The output of the engine coolant temperature sensor.

PCM - Engine Data 2 - ECT: The scan tool displays -40 to +215°C (-40 to +420°F). The output of the engine coolant temperature sensor.

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.

PCM - Engine Data 2 - A/C Compressor Cycling Switch: The scan tool displays Normal and Low Pressure. The output of the A/C pressure sensor.

PCM - Engine Data 2 - A/C Request Signal: The scan tool displays Yes or No. Yes is displayed when the HVAC control module is requesting the PCM to turn on the compressor clutch.

PCM - Engine Data 2 - A/C High Pressure Recirculation Switch: The scan tool displays OK or Low Pressure. Displays the output of the High Pressure Recirculation Switch.