Thanks Rolls! For some reason I didn't find that when I was searching, but it is what I need.
Before I drove home from work this arvo I set auF0523 AD to 0 across the RPM range and auF0162 to 3600 seconds (one hour) at all coolant temps.
To be sure, I'll set AD to -100 as per your comment at the above link and set auF2504 to 4096 degrees C.
When troubleshooting a suspected hardware issue, it is neat to be able to use the tune to help isolate things!