Scan tool (automotive)


An automotive scan tool is an electronic tool used to interface with, diagnose and, sometimes, reprogram vehicle control modules.
There are many types from just as many manufacturers, one of the most familiar being the Snap-On "brick", or MT2500/MTG2500. Snap-On, Hella Gutmann Solutions, OTC/SPX, Autel, Launch, Vetronix/Bosch and a number of other companies produce various types of scan tools, from simple code readers to highly capable bi-directional computers with programming capabilities.
The scan tool is connected to the vehicle's data link connector and, depending on the particular tool, may only read out diagnostic trouble codes or DTC's or may have more capabilities. Actual scan tools will display live data stream, have bi-directional controls and may even be able to calibrate/program modules within certain parameters. However, a typical scan tool does not have the ability to fully reprogram modules because it requires a pass-through device and specific software.