GM Service Manual Online
For 1990-2009 cars only
ABS Reference Speed: The scan tool displays 0-255 km/h (0-159 mph). The vehicle speed from the average of all four wheel speeds.

Ignition Voltage: The scan tool displays 0-17 Volts. The level of the ignition voltage at the EBCM.

LF Wheel Speed: The scan tool displays 0-255 km/h (0-159 mph). The actual speed of the left front wheel.

LR Wheel Speed: The scan tool displays 0-255 km/h (0-159 mph). The actual speed of the left rear wheel.

MagnaSteer® Commanded Current: The scan tool displays 0.00 to 3.00 amps. The amount of current that the EBCM is commanding to the variable effort steering (VES) actuator.

MagnaSteer® Failed: The scan tool displays Yes or No. Yes indicates the VES system is disabled due to a malfunction. No indicates the system is operating to specifications.

MagnaSteer® Feedback Current: The scan tool displays 0.00 to 3.00 amps. The amount of current returning to the EBCM from the VES actuator.

MagnaSteer® Indicator/Message: the scan tool displays Off or On. The status of the VES indicator or message, if equipped. Indicates if the VES indicator or message is currently on or off.

RF Wheel Speed: The scan tool displays 0-255 km/h (0-159 mph). The actual speed of the right front wheel.

RR Wheel Speed: The scan tool displays 0-255 km/h (0-159 mph). The actual speed of the right rear wheel.

Switched System Battery Voltage: The scan tool displays 0-17 Volts. The voltage available to the EBCM when the ABS relay is energized.