AU EEC-V self test

[javelin57]

G'day all, I was wondering if it is possible for the home mechanic, to run a self test on the factory computer.
I have recently perchased my au11 5 litre ute, and just want to see if there are any codes stored.
If there were any problems, would the spanner be flashing?
I have a Max Ellery's manual, which is next to useless.
It makes reference to running a KOEO or KOER test "as described in diagnostics section"
The only problem is that they forgot to include the test:togo:
Does the au have a OBD11 plug? or has it changed to something else?
I have found a couple of "code readers"
on the net, but don't know if they will do the job, as they suit the OBD11 plug type.