So I took the PIDs from the documents in the above post and fired them at the AU
PCM, and managed to peice most of them together. Still need to work out some scale factors and offsets though. Temperature doesn't quite agree with the values displayed in dash diagnostic mode... seems to be an offset of 10 degrees or so.
Also still missing a few PIDs, notably transmission fluid temp and engine MAP. Currently running a "brute force" scan to test all possible mode22 pids from 0000 to FFFF.
I've got a small app up and running than can log a few parameters to help work things out. Will post it somewhere if anyone is keep to help work out how to decode the data.
Ive attached a spreadsheet with the PIDs I've gotten a response to so far, and some comments on the scale factors/offsets (not sure about a lot of them).