Transmission draining and filling?

Checking and filling the fluid requires a specific, temperature-sensitive procedure utilizing three distinct plugs on the transmission housing: a refill plug (higher up on the side/front), a drain plug (at the bottom of the pan), and an overflow/level check plug (a smaller plug embedded inside or next to the drain plug assembly).

First and most important, use Toyota Genuine CVT Fluid FE. Do not use generic fluids, as incorrect friction characteristics will damage the belt and pulleys.

You will also need a fluid pump or a long funnel with a flexible hose and a scan tool capable of reading live transmission fluid temperature data. Ensure the vehicle is safely elevated and completely level otherwise the overflow method I'm giving you below won't work correctly.

Side note: Make sure you reinstalled the drain plug with a new crush washer on the main drain plug and torque it down.

Remove the upper refill plug completely and insert your fluid pump hose or long funnel and pour new fluid into the transmission. Usually you start with as much as you drained out. Then temporarily thread the upper refill plug back in by hand.

The fluid level will expand with heat, so setting the final level will need to be within a specific fluid temperature window, typically between 35°C–45°C / 95°F–113°F.

Plug your scanner in and monitor the CVT Fluid Temperature live data stream.

Start the engine, apply the parking brake, keep your foot on the brake pedal, and slowly cycle through all the gears (P ? R ? N ? D and back), pausing for a few seconds at each position. Return the shifter to Park (P) and let the engine idle.

Allow the car to idle until the transmission fluid temperature reaches the target range above.

Open the Overflow/Check Plug: With the engine still running in Park and the car level, place your catch pan under the center overflow check plug on the transmission pan and remove the check plug.

If a steady stream rushes out and slows to a drip, the fluid level is correct; proceed to close and your all set.

If nothing comes out the transmission is underfilled. Turn off the vehicle, remove the upper refill plug, add roughly 0.2 to 0.3 quarts of fluid, restart, bring back to temperature, and re-open the check plug.

Would you do all of this before doing any of the memory settings and calibrations?

Yes, the settings use the fluid levels, pressures and temperatures so you need it full of fluid before you do the calibration.