For 1990-2009 cars
Battery Voltage: The scan tool displays 0-17 volts. The level of battery voltage available at the power steering control module (PSCM).
Ignition Voltage: The scan tool displays 0-17 volts. The level of ignition voltage available at the PSCM.
Motor Voltage +: The scan tool displays 0-17 volts. The amount of voltage being supplied to the EPS motor while turning right.
Motor Voltage -: The scan tool displays 0-17 volts. The amount of voltage being supplied to the EPS motor while turning left.
Steering Calibration: The scan tool displays 1-8. The number of the steering calibration the PSCM has chosen based on the VIN. All 8 of the steering calibrations for EPS are stored in the body control module (BCM).
Steering Shaft Torque: The scan tool displays -20.70 N·m to +20.70 N·m (15.2 lb ft). The amount of torque being applied to the steering column shaft when turning the steering wheel. This signal voltage is from the detection coil of the torque sensor which is then converted to N·m by the PSCM. A - value indicates a left turn, a positive value indicates a right turn.
Vehicle Speed: The scan tool displays 0-255 km/h (0-156 mph). The actual speed of the vehicle.