GM Service Manual Online
For 1990-2009 cars only

Data

Battery Voltage: The scan tool displays the battery system voltage.

EVO Desired Current: This data is what the body control module is trying to achieve.

EVO Actual Current: This data is the actual value of the actuator.

EVO Command: This data is the state of the actuator measured in counts.

EVO Input Current: This is the current/voltage input to the controlling device of the actuator

EVOLO Feedback: This data is the monitored return voltage from the actuator to the BCM.

EVOHI Feedback: This data is the monitored output voltage from the BCM to the actuator.

Steering Wheel Position: This data is the position of the steering wheel measured in volts.

Steering Wheel Rate: This data is the speed at which the steering wheel is turned.

Vehicle Speed: This is the body control module measurement of the vehicle's speed from a discrete input from the powertrain control module (PCM).

Special Functions

EVO PWM: This function gives the scan tool user the ability to command the EVO actuator ON and OFF for diagnostic purposes.