I don't know if it is relevant, but I just found some SM4 autotune tuning.
In this video you can see how easy the autotune function is.
This video starts in the fuelmap, where all the blocks need to be tuned.
When they start you can see the 2 black blocks moving slowly together at the bottom of the map, this represents the preset A/F and measured A/F.
You can notice one of the block in the map has an red square around it. That is the block they are autotuning. The fuelmap has a preinstalled map behind it where the ideal A/F of every block is. The autotune adjusts the amount of fuel needed to reach that ideal preset A/F.
You keep the engine's rev/load the same to keep the red square exactly over one of the blocks. Then the autotune starts its work, and keeps adjusting the fuel amount to get to that blocks specific preset A/F. When the block you are working on starts turning yellow, you are allmost there.
A green block means it is whitin spec.
You can not autotune every block and don't need to because you don't use all the blocks when driving. Boost maps are manual tuned. It's about the same ,but you need to log a run and then manually change the fuel. Then log a run again, and adjust it. This is done until you are happy with your A/F (Boost).
http://www.youtube.com/watch?v=L7I4Zn0sbFc
http://www.youtube.com/watch?v=iM0x71epzxk
on a turbo busa