Here's a link to the codes using an OTC 2000. Ken provided it recently. Some codes aren't able to be read. All scan tools are like that. Unless maybe you get one of those monsters the dealerships use.
If you need an instruction manual, contact:
OTC Division, SPX corp.
655 Eisenhower Drive, Owatonna, MN 55060
(507-455-7000)
Customer service: 1-800-533-6127
Technical Services: same as above #
The GSCA also may have one: 912-244-0577
There's some info in the archives concerning the OTC's as well. Use the "search" option & type in "2000" in the "Scan Tool Section." If I can help any further, let me know. I have an OTC 4000e & the user's manuals. The two are basically the same animal.
HTH