RAV4 has only got one 4WD ratio, i.e high ratio. Most 4X4 would have a low ratio gear which would essentially double your power and torque and reduce your speed by half. This is used for difficult terrain normally.
ECT is normally to do with your auto transmission, am not sure what its function would be in your specific car, its usually is to do with upshifts and down shifts, i.e at what engine speed.
Bilal Baray Bhai Jan, who said I am driving at this tender age?
Anyway thanx for the info, Your ride is in very nice condition.