What is ECT and O/D Over Drive in automatic cars? What does ECT and O/D in Toyota Hilux Surf 1995

ECT stands for electronically controled transmission
ECT is an acronym for Electronically Controlled Transmission and the ECT PWR button is a function of the redesigned transmission. When pressed, the ECT PWR button will adjust shift points so you can reach higher RPM levels before shifting into the next gear. This innovative feature employs a system of hydraulics that operate clutches and bands within the transmission and are controlled by an electronic solenoid. When in operation, the ECT PWR feature will provide a greater degree of control over your speed and enhance control
The "OD" means over drive. It's the last gear in your transmission. When the indicator shows as "off", it means the transmission won't go into that gear.
Overdrive provides a mechanical advantage for the engine to run at a slower speed when traveling at highway speeds. This allows for better fuel economy. As I stated, it is the last gear in the transmission and provides a better than 1:1 ratio. Depending on the car, it will be around .70:1 (or thereabouts).
As far as whether it's on/off by default, you should allow the vehicle to achieve O/D whenever it wants to, which will allow the best fuel economy. It appears the button on your shifter is actually a switch. If you push it, it changes position and therefore the function it will allow. Since it does this, there's no real "default". If it were just a push button and the computer decides your actions, then there would be a default setting. Like I said, leave O/D on to operate normally. Modern vehicle computers are smart enough to know when to use O/D and when not to.
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