For 1990-2009 cars

The ALC scan tool data definitions contain a brief description of all ALC related parameters available on the scan tool. The parameters that are available on the scan tool are listed below in alphabetical order.

Battery Voltage: The scan tool displays 0-25.5 volts. The Battery represents the system voltage measured by the ALC at its battery feed.
Sensor Position: The scan tool displays - 30 - + 30 millimeters.
Sensor Position: The scan tool displays 0 - 255 A/D counts.
Vehicle Speed Signal: The scan tool will display if the vehicle speed sensors are active or inactive.