How does ETCS-i on an Aristo 2JZ-GTE VVTi work in a SC300?
 

The one part that has been confusing me about Aristo swaps into SC's is the fact that our cars are not DBW while an Aristo is. People say to get the harness done by Tweak and then get a Supra throttle cable and everything should be fine, but how does this work? Does it use a cable from the cabin that goes to a sensor on the throttle body? I'm just a little confused since that basically seems very similar to just a regular throttle cable but with extra steps.

And before people go on about doing different kinds of builds for an SC...
I've been researching different build ideas for my 95 5-speed and of course 2JZ-GTE is an option. NA-T worries me as my engine/trans have 335k miles on them so I'm not entirely sure how they will hold up. 1JZ is the swap I'm most familiar with and the most straightforward so I've been leaning towards that.

Hopefully this makes sense

The ETCS-i on the aristo motors uses a cable, just like a regular non-DBW setup. The difference is the cable only actuates the first 15% of the throttle plate mechanically. After that point, the TPS (throttle position sensor) reads the voltage to tell how much the cable is pulling and instead of directly opening the throttle, it uses a stepping motor to open the throttle plate. It sounds wonky, but physically moving the throttle body with your hand you can see it only opens it very little bit for emergency usage, the rest then is all stepping motor reading and correlating how much the throttle cable is pulling into the butterfly opening.

That does make sense and pretty much explains how it basically works. Interesting read, thank you!