Scan Tool Data Definitions

WARNING: This page is about a different car, the 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Active AWD Mode: The scan tool displays YES or NO. This parameter indicates whether or not the AWD Mode is active.

ATC Calibration Part Number: The scan tool displays a numeric value. This parameter indicates the part number assigned to the current version of calibrations used in the ATC module.

ATC Hardware Part Number: The scan tool displays a numeric value. This parameter indicates the part number assigned to the module (excluding the software and calibrations).

ATC Julian Date: The scan tool displays a numeric value. This parameter indicates the production date of the ATC module.

ATC Part Number: The scan tool displays a numeric value. This parameter indicates the GM part number assigned to the module package (module, software, and calibrations).

ATC Slip Speed: The scan tool displays a range of 0-8192 rpm. This parameter indicates the rpm difference between the front and rear propshafts.

ATC Software Part Number: The scan tool displays a numeric value. This parameter indicates the part number assigned to the current version of software used in the ATC module.

Auto 4WD Indicator Light: The scan tool displays ON or OFF. This parameter indicates if the Auto 4WD Indicator Light is being commanded by the transfer case shift control module.

Battery Voltage: The scan tool displays a range of 0-25.5 volts. This parameter indicates the voltage measured by the transfer case shift control module at it's battery feed.

Clutch Pedal Engaged: The scan tool displays YES or NO. This parameter indicates whether or not the clutch pedal is engaged.

Current Slip Adapts: The scan tool displays a numeric value. This parameter indicates corrective adjustments made by the transfer case shift control module for wheel slip events.

Encoder Gear Position: The scan tool displays a range of Auto 4WD to 4WD Low. This parameter indicates the current mode in which the ATC is operating.

Encoder Return Voltage: The scan tool displays a range of 0-25.5 volts. This parameter indicates the voltage measured by the transfer case shift control module at it's encoder signal return.

Encoder Supply Voltage: The scan tool displays a range of 0-25.5 volts. This parameter indicates the voltage measured by the transfer case shift control module at it's encoder power.

Front Axle Requested: The scan tool displays YES or NO. This parameter indicates if the front axle switch has been requested by the transfer case shift control module.

Front Axle Switch: The scan tool displays Locked or Unlocked. This parameter indicates the feedback states of the front propshaft.

Front Propshaft Speed: The scan tool displays a range of 0-8192 rpm. This parameter indicates the rotational speed of the front propshaft.

Ignition Cycles Since Last Current DTC: The scan tool displays a numeric value. This parameter indicates how many ignition cycles have occurred since last current DTC was set.

Mode Switch Return Voltage: The scan tool displays a range of 0-25.5 volts. This parameter indicates the return voltage from the mode switch.

Mode Switch Selected: The scan tool displays ON or OFF. This parameter indicates the ATC mode switch button currently depressed by the driver.

Neutral Indicator Light: The scan tool displays ON or OFF. This parameter indicates if the Neutral Indicator Light is being commanded by the transfer case shift control module.

Rear Propshaft Speed: The scan tool displays a range of 0-8192 rpm. This parameter indicates the rotational speed of the rear propshaft.

Service 4WD Lamp: The scan tool displays ON or OFF. This parameter indicates if the Service 4WD Lamp is being commanded by the transfer case shift control module.

Slip Adapt PWM: The scan tool displays a range of 0-100 %. This parameter indicates the Duty Cycle applied to the ATC motor.

Total Slippage: The scan tool displays a range of 0-8192 rpm. This parameter indicates the total slippage of both the front and rear propshafts.

Transfer Case Lock: The scan tool displays Enabled or Disabled. This parameter indicates if the transfer case shift control module is commanding the transfer case motor brake ON.

2WD High Indicator Light: The scan tool displays ON or OFF. This parameter indicates if the 2WD High Indicator Light is being commanded by the transfer case shift control module.

4WD High Indicator Light: The scan tool displays ON or OFF. This parameter indicates if the 4WD High Indicator Light is being commanded by the transfer case shift control module.

4WD Low Active: The scan tool displays YES or NO. This parameter indicates whether or not the 4WD Active mode is active.

4WD Low Indicator Light: The scan tool displays ON or OFF. This parameter indicates if the 4WD Low Indicator Light is being commanded by the transfer case shift control module.