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A gravitational force (g-force) is the acceleration that an object feels relative to free fall, and free fall happens when gravity is the main force that an object is experiencing. In vehicles, g-forces are found within acceleration and braking systems, and you can measure these g-forces using scanner systems. Most of these scanner tools are designed to communicate with the on-board diagnostic II (OBD-II) system, which is the main computing component of a vehicle. These scanners help you diagnose problems with your vehicle.
The GMC Envoy, manufactured from 1998 until 2009, has an on-board diagnostics feature (called OBD II) that allows a car owner or mechanic to diagnose engine problems by reading diagnostic trouble codes (DTCs) that are generated by sensors in the powertrain. There are many varieties that feature different options and have different methods for reading and erasing codes. While very easy to operate, the instruction manual will direct you how to properly use the reader.
2Open the GMC Envoy's driver-side door and look under the dashboard to locate the OBD II connector.
3Place the plug of the reader into the connector. Because of its shape, you can only plug it in one way.
4Place the key in the ignition and turn the key two clicks forward to the accessory power position. It is advisable to write the codes on a piece of paper.
7Wait for the reader to tell you from the onscreen menu that the diagnostic trouble code has been erased, then unplug it from the connector.
8Start the engine of the Envoy and look at the instrument panel to ensure the check-engine light is out.
The AutoEnginuity Scan Tool is a scan tool for OBD-II and Enhanced OBD (EOBD) IV vehicles, and it is universal serial bus (USB) 2.0 compliant. This tool allows you to measure g-forces, torque, miles per hour (MPH) and horsepower, and you can output vehicle speed information into graphical form. This tool outputs DTC information and can run tests on your system to determine whether or not it is working properly. Other features of this tool include capturing live data as your vehicle is in motion and obtaining data about your different sensors, including oxygen (O2), ignition and timing sensors.
