
Originally Posted by
oj88
A/Ts behave slightly different from vehicle to vehicle. Unfortunately, I've never driven a Mazda to form a more definitive answer. However, the particular behavior you described still seems to fall within the norms of A/T operation. Shift points are never a fixed value. Like other parameters such as air/fuel ratio, it responds to pre-determined maps based on sensor inputs (ie. Engine load, RPM, speed, accelerator pedal position, coolant temp, etc.) and shift points are changed dynamically depending on what the ECM/PCM 'thinks' is the most efficient way to shift up or down.
Also, the reason you have low gears (1/L, 2, D3, etc.), aside from its other obvious uses, is to give the driver the option to engage engine braking if he deems it necessary. Otherwise, if you leave it in D, the A/T logic takes over all control and just rely on its own sensors to decide what to do.
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