I found this, as linked from the Factory Service Manual:
Digital Wrench Informational Site
Page 3.3 in the FSM lists part numbers etc... The site above is a bit crude and I haven't done much surfing on it to get a good handle on how all this is done. I didn't find anywhere in the FSM how to access the diagnostics screen, only how to read codes but to do that it appears you have to have the CEL showing.
Cheers,
cc