Throttle Lag On DBW

[Yaris Hilton]

Originally Posted by bronsin

Not sure what that is. The problem is: you push on the gas pedal and the car doesnt move until you push harder. Just how hard takes a while to figger out. My wifes 05 Camry is the same way. My 01 ECHO (cable) doesnt do that.

DFCO is Deceleration Fuel Cutoff. Whenever you're coasting with the engine turning much above idle speed, the fuel is completely cut off for zero emissions and zero fuel consumption. That of course drags the car down a bit faster than coasting with an idling engine. As you press the gas pedal, there's a slight free play before it recognizes that you want some power, and when the fuel cuts on it's slightly above the idle power level. You'll feel a small surge forward, and when you back off and the fuel cuts off again, there's a sudden slight deceleration. Like I said, if you're cruising slowly on level ground where very little power's needed, you'll feel it surging and dragging as it cuts the fuel on and off. That's normal behavior. The old Echo's ECU was much less sophisticated and didn't have this feature. Automatic Yarises up through about the middle of the 2007 model year didnt have it in Drive, either.