The Tech-2 is the same tester GM Technicians use to diagnose GM vehicles. The Vetronix Tech 2 comes with Authentic GM software and provides support for on-board diagnostics on all GM systems 1992 thru 2011. We share the procedure of   GM Tech-2 self-test, wish it helpful!

1.You should insert gm card into card slot of Tech2

2.You should connect self- test adapter with Tech2, then power on machine

3.You should enter Main menu then choose F4: tool options, then step by step as follows.

Last you can see the VCI self-test result.