Today we test shift solenoids and flush automatic transmission fluid on my 2005 AWD Toyota Matrix, but this will be the same for any Corolla/Matrix using the U340/U341E/U341F transmissions. There are a lot of combinations so check this link to see which you have: https://en.wikipedia.org/wiki/Toyota_U_transmission
Solenoid testing should be similar for any electronically controlled transmission that uses shift solenoids.
Fluid flushing should be similar for most conventional (non CVT) automatic transmission. But do your research first, I’m sure there are some oddball exceptions out there.
Shift diagnosis chart specifically for U340/U341E/U341F transmissions: https://atracom.blob.core.windows.net/bulletins/2017/feb/atb1785.pdf
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