GM Service Manual Online
For 1990-2009 cars only
Vehicle Speed: The scan tool displays 0-255 km/h (0-159 mph). The actual speed the vehicle is moving.

VES Actuator Commanded: The scan tool displays -2.00-3.00 amps. The amount of current that the EBCM is commanding to the VES actuator.

VES Actuator Feedback: The scan tool displays 2.00-3.00 amps. The amount of current returning from the VES actuator to the EBCM. The scan tool displays the absolute, or positive value of the feedback current. Thus the - symbol is not displayed.