If you have an Android smart phone (probably exist for Apple and Windows as well, I just don"t have those) go to the "app store" and get a piece of software called Torque OBD for ~$5 and pick up a Bluetooth OBD interface off of e-bay for ~$15 and you can do see anything any of the inexpensive scanners can. Probably fill most of your needs. Gives you an excuse to get a smart phone as well if you don"t have one.
I did this just to find an excuse to try out an app on the new Galaxie III. I haven't got the paid version of Torque yet, but it does work. I have a Pontiac Vibe (Toyota Matrix with a different logo) and there is a Toyota specific code app that reads its codes well and shows real time position of transmission solenoids, throttle switches, etc. that works great.
I paid about $25 for the blue tooth OBDII reader from Amazon.