most probable explanation it seems.

well on preve, sometimes it does feel like the engine is going to stall during cvt clutch engage/before disengage.

this issue is reported mainly on the exec line. The alleged solution was to update the ECU/TCU.

Suprima S is very new, which means, if there is an updated ECU/TCU version, it should've been implemented from factory. What are the production people doing?

We as users, we don't have a method to check what our ECU/TCU version is. Had we known, we would've done something during acceptance.



But come to think of it, Suprima S and Preve exec don't share the same CVT, so perhaps it is not that plug and play after all.