Thanks Steptoe.

That is worrying. I've got a second hand (but good) Throttle body and new thermostat housing and stat to try next. Not my ideal way of working by just replacing parts, but at a bit of a loss.

My worry is that these wont help since I can see the throttle pedal registering a result on the hawkeye and ultimately disconnecting the maf everything works perfectly, which makes me think the throttle body must be working o.k. 2010 L322 Autobiography Black Edition
1975 Land Rover

Hi Folks. I realise this thread is a couple of years old but I read this a few days ago as I had the 0x485 P0000-Throttle adaptation, spring test failed code come up and the Engine Protection Program "gong of death" message on the dash. I had VERY rough idle and absolutely no throttle response. This was after I was adding the AUX setting in the CCF for the head unit using the GAPiiD tool and of course was totally unrelated to this throttle body fault. So after a lot of reading online and head scratching I was able to get it running and driveable by disconnecting the MAF sensor which apparently stops the throttle body test from being run but the car runs with a default air flow setting so not a long term fix.
Anyway, after a sleepless night and an overnight battery charge it was still the same next morning but I decided to take it for a short drive with MAF disconnected. When I got home I reconnected the MAF and fired her up and the fault had completely cleared.
It appears that my battery had become very low and I made it worse by using the GAPiiD tool configuring the CCF so drained the battery even more. I recall seeing 11.8v on the IID the night before but didn't twig. The overnight trickle charge wasn't quite enough to recover but the drive around allowed the alternator to charge her back to 12.6v which was sufficient to clear the fault and I have not had the problem since.
So I guess I am posting this in the hope that it will help someone else and reinforce the fact that these wonderful, but temperamental vehicles can throw all sorts of codes when there isn't necessarily a fault, all because of low battery voltage. The other thing to remember is to put a power supply to the vehicle whenever configuring CCF or similar tasks so that battery voltage doesn't drop and cause serious issues. Hope this helps.