Throttle Lag On DBW

[Yaris Hilton]

Originally Posted by bronsin

Hmm you said "turn the (ignition?) switch" off. I agree it would stop. But we're talking about taking your foot off the gas pedal and supposedly the fuel is cut off. If I took my foot of the gas of my Yaris it would slow down sure. But it would eventually go about 5 mph, not stop.

Because the ECU is monitoring the engine speed, and as I said above, when it gets down to a preprogrammed speed a little above normal idle (about 800 RPM by my tach), the fuel cuts back on with the engine running at idle power. Those Toyota engineers are pretty smart fellows. They figured we don't want our engines to just die every time we coast. On my automatic, the torque converter stays locked down to the point where the engine cuts back on. It locks (as judged by the RPM and speed staying tightly linked together) even at rather low speeds cruising around town. Mine has "learned" that I like to drive in economy mode.