You also have to buy additional upgrades for each manufacture you want to do more than ODBII for(i.e.
The only thing I can think of that it doesn't do is flash modules. if you force a light on and it works you know the light itself works). The value in these is probably that you can eliminate 1/2 of an issue if you can directly ask the PCM, BCM, etc to perform a task and see if it does it (i.e. There is also a Christmas tree test of the cluster gauge that forces all warning lights on, even those that aren't supported in the car and don't turn on when starting the car. There are about 10 modules available that I haven't really gotten into yet (including the radio, OnStar, etc). The body control module lets you active interior/exterior lights, activate locks, wipers, etc. There is a remote key module for adding new key fobs. However, one they added is called "drain fuel tank" which just lets you use the fuel pump to drain the tank. Even the 96 has a few system tests you can initiate. You can force the radiator fan on, turn on any of the cluster lights for testing, force the A/C clutch to engage (even if it really shouldn't, i.e. You just change the idle RPM in the tool and the car idles where you want it for the test. If you're drawing in refrigerant into the A/C system no more need to hold the throttle cable in one hand to maintain RPM and draw the refrig with the other. Just select the pump actuator and turn the pump on from the tool. If you're doing a fuel pressure test no more need to click the key back and forth to active the pump.
set temp to 100%, make tach do a full sweep, etc). I can set anything on the cluster gauge for testing (i.e. Even my little 96 has an amazing number of things to actuate. It also has numerous actuators available for each module. Not only does it have access to generic ODB II stuff but it also has access to all the GM specific values. It claims to have nearly everything that the Tech II has and, honestly, I believe it. I've had my AutoEnginuity scan tool for a bit now and I can't say enough about how cool it is.