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06-17-2010, 10:03 AM
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#1 |
  Drives: 09 4 door sedan Join Date: Mar 2010
Location: Toronto
Posts: 69
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Engine Braking???????
Hi Everyone I have a question. Don't know if thei was covered before, but I'll ask anyways.
There are times when I am driving downhill and my car will, what feels like, down shift. It's a 09 Yaris Sedan. IS this normal? is this what is called Engine braking? Kinda getting concerned. Let me know |
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06-17-2010, 10:52 AM
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#2 |
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Crazy Oil Sniffer
Drives: MM 09 Yaris 5 Dr LB "Click" Join Date: May 2009
Location: ME
Posts: 498
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Yep it's normal. When you let completely off the throttle the Yaris enters Deceleration Fuel Cut Off (DFCO) at anything over approx 1100 rpm. No fuel is used during DFCO and you are engine braking. On steep grades the engine may actually downshift to help slow you down, most usually after the brake is applied in my experience. One of my favorite features of this transmission actually.
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"The howl was the sound of God’s casting pot, the morphing of my cells into shape, the forming of oceans out of molten premordial plasma. And I could feel it. I could cry for it. I could cry with it." -The Fitful One 
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06-17-2010, 10:52 AM
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#3 | |
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"LibertyRides!"
Drives: 2010 Yaris 3Dr LB | 2020 Stang Join Date: Mar 2010
Location: State College, PA, USA
Posts: 576
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Quote:
Not to worry!  Cheers!
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~ Mark ~ 2010 Yaris 3-Dr Liftback, 5-Speed Manual, P185/60R 15, Bayou Blue Pearl I Love my YARIS  - (Click below to see Gaslog): Most miles Tank: 538 tank/10.148 gal = 53.015 MPG / Most MPG: 54.95 MPG (ethanol) 425 tank/7.73 gal "The evils of government are directly proportional to the tolerance of the people." -- Frank Kent |
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06-17-2010, 11:34 AM
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#4 |
Drives: 2007 4dr Sedan Silver Streak Join Date: May 2010
Location: Montreal, Canada
Posts: 73
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If you're still giving it gas that is not likely to happen, but if you've let off the gas it's normal, and is as you say "engine braking."
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06-17-2010, 01:47 PM
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#5 |
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Half a Bubble Off Plumb
Drives: 2009 Yaris Sedan Join Date: Mar 2009
Location: Bristol, Tennessee, USA
Posts: 1,593
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The ECU has "Downhill Logic" built in to sense acceleration with the throttle closed and shift accordingly. If you let it coast from a lower speed and gear, you'll feel it upshift and really take off. Touch the brake and it downshifts to let the engine's drag help slow the car down.
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06-19-2010, 11:04 AM
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#6 |
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Drives: 09 4 door sedan Join Date: Mar 2010
Location: Toronto
Posts: 69
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thanks guys, I thought that the down shifting would be a problem, the RPM jumps up so I thought there was a problem...
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06-19-2010, 08:48 PM
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#7 |
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Drives: 2007 4dr Sedan Silver Streak Join Date: May 2010
Location: Montreal, Canada
Posts: 73
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Are you driving in 3 instead of D? It's more noticeable in lower gears.
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06-19-2010, 08:59 PM
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#8 |
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Drives: 09 4 door sedan Join Date: Mar 2010
Location: Toronto
Posts: 69
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Nope In D...
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