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Drive-by-wire throttle hesitation with 5 speed manual?

 
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SQ

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Since: Jun 12, 2007
Posts: 3



(Msg. 1) Posted: Thu Sep 06, 2007 2:46 pm
Post subject: Drive-by-wire throttle hesitation with 5 speed manual?
Archived from groups: alt>autos>toyota (more info?)

Does the infamous throttle hesitation problem created by Drive-By-Wire
exist on 5th generation 2AZ-FE Camry with 5 speed manual transmission?

In other words, does DBW latency affect both auto and stick shifts?

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nm5k

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Since: Jun 11, 2007
Posts: 44



(Msg. 2) Posted: Thu Sep 06, 2007 5:00 pm
Post subject: Re: Drive-by-wire throttle hesitation with 5 speed manual? [Login to view extended thread Info.]
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On Sep 6, 12:46 pm, SQ wrote:
> Does the infamous throttle hesitation problem created by Drive-By-Wire
> exist on 5th generation 2AZ-FE Camry with 5 speed manual transmission?
>
> In other words, does DBW latency affect both auto and stick shifts?

Hummmm. Dunno. As far as I know, my corolla uses the "throttle by
wire" setup so to speak, and I don't notice any real latency at all..
I've noticed in the manual that they say if it ever conks out, I'll
have
trouble getting much throttle, and will likely notice vibration.. ??
They say the car will still be drivable at low speeds, I guess using a
bit of physical push with the pedal.
But anyway, the throttle on mine seems very fast. I've never noticed
any lag. In fact, it seems as fast as a normal linkage as far as I
can
tell.. But maybe mine is different.. BTW, mine is a auto, not a
manual.
Don't know if that makes a difference or not.. I guess the best way to
test is to actually drive one and see how it feels.
MK

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Hachiroku_ハチロク

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Since: Nov 19, 2006
Posts: 1529



(Msg. 3) Posted: Fri Sep 07, 2007 2:55 am
Post subject: Re: Drive-by-wire throttle hesitation with 5 speed manual? [Login to view extended thread Info.]
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On Thu, 06 Sep 2007 10:46:28 -0700, SQ wrote:

>
> Does the infamous throttle hesitation problem created by Drive-By-Wire
> exist on 5th generation 2AZ-FE Camry with 5 speed manual transmission?
>
> In other words, does DBW latency affect both auto and stick shifts?


I would imagne so. I have a Scion tC with the same engine, and there is a
slight hesitation.

I don't drive the car that much, and I have a Mazda 626 ('89) that has the
traditional throttle cable, so I notice it in the Scion. However, the more
I drive the car, the less it bothers me...
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SQ

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Since: Jun 12, 2007
Posts: 3



(Msg. 4) Posted: Fri Sep 07, 2007 1:11 pm
Post subject: Re: Drive-by-wire throttle hesitation with 5 speed manual? [Login to view extended thread Info.]
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On Sep 7, 9:24 am, EdV wrote:


> 4. DBW electronics delay due to improper grounding of the wires to the
> painted body. According to some, scratching of the paint underneath
> all the grounding points solved the hesitation. Others would even
> install the grounding wire kits to improve electronics functionality.
> but this is applicable to other DBW cars (stick and automatic) and not
> only for the 07 camry.

Interesting.. could you clarify this point? Where are these wires?
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EdV

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Since: Jun 01, 2007
Posts: 215



(Msg. 5) Posted: Fri Sep 07, 2007 2:55 pm
Post subject: Re: Drive-by-wire throttle hesitation with 5 speed manual? [Login to view extended thread Info.]
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I have read several reasons on the internet on why a hesitation on the
2007 2AZ-FE Camry (6th generation), not sure about the 5th gen.

1. Junk U-type Automatic Transmission.
2. The software delays sudden power surge to protect the gears in the
Automatics due to the fact that they use junk transmission stated in
#1
3. For improved MPG, the automatics will shift up when throttle is
released and when you suddenly step on it again the transmission can't
instantly shift 2 or 3 gears down.
4. DBW electronics delay due to improper grounding of the wires to the
painted body. According to some, scratching of the paint underneath
all the grounding points solved the hesitation. Others would even
install the grounding wire kits to improve electronics functionality.
but this is applicable to other DBW cars (stick and automatic) and not
only for the 07 camry.



On Sep 6, 1:46 pm, SQ wrote:
> Does the infamous throttle hesitation problem created by Drive-By-Wire
> exist on 5th generation 2AZ-FE Camry with 5 speed manual transmission?
>
> In other words, does DBW latency affect both auto and stick shifts?
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SQ

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Since: Jun 12, 2007
Posts: 3



(Msg. 6) Posted: Sat Sep 08, 2007 1:25 am
Post subject: Re: Drive-by-wire throttle hesitation with 5 speed manual? [Login to view extended thread Info.]
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On Sep 7, 10:32 pm, EdV wrote:
.....

Thanks for posting, much other interesting info there.

It seems DBW is a good concept in theory, but it appears there are
some bugs in it to be worked out, especially in the new 5-speed
automatic transmissions.

It's also not clear if the throttle delay is a result of
DBW technology or Toyota's new Variable-Valve Timing
technology.
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EdV

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Since: Jun 01, 2007
Posts: 215



(Msg. 7) Posted: Sat Sep 08, 2007 6:32 am
Post subject: Re: Drive-by-wire throttle hesitation with 5 speed manual? [Login to view extended thread Info.]
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you can read more on,
http://www.scionlife.com/forums/viewtopic.php?t=29261
this guy made a step by step DIY on how to make your own wire and
explains the benefits of grounding wire.

I did not do any modification on my car. For discussion purposes only.


> Interesting.. could you clarify this point? Where are these wires?
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Hachiroku_ハチロク

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Since: Nov 19, 2006
Posts: 1529



(Msg. 8) Posted: Sat Sep 08, 2007 11:55 am
Post subject: Re: Drive-by-wire throttle hesitation with 5 speed manual? [Login to view extended thread Info.]
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On Fri, 07 Sep 2007 21:25:25 -0700, SQ wrote:

> On Sep 7, 10:32 pm, EdV wrote: ....
>
> Thanks for posting, much other interesting info there.
>
> It seems DBW is a good concept in theory, but it appears there are some
> bugs in it to be worked out, especially in the new 5-speed automatic
> transmissions.
>
> It's also not clear if the throttle delay is a result of DBW technology or
> Toyota's new Variable-Valve Timing technology.


It's the DBW. I've had VVTi on other cars with no problems.

On the Scion, there is an adjustment under the throttle, in the form of a
screw. You can adjust the screw to take up some of the 'slack'. I did this
and the hesitation diminished noticably.

Maybe I'll try the grounding trick next...
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Retired VIP

External


Since: Nov 04, 2007
Posts: 54



(Msg. 9) Posted: Sat Sep 08, 2007 3:10 pm
Post subject: Re: Drive-by-wire throttle hesitation with 5 speed manual? [Login to view extended thread Info.]
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On Sat, 08 Sep 2007 02:32:58 -0000, EdV wrote:

>you can read more on,
>http://www.scionlife.com/forums/viewtopic.php?t=29261
>this guy made a step by step DIY on how to make your own wire and
>explains the benefits of grounding wire.
>
>I did not do any modification on my car. For discussion purposes only.
>
>
>> Interesting.. could you clarify this point? Where are these wires?
>

Folks, this procedure is a waste of time. If you notice, the only
improvement he noted was a slight reduction in the ground resistance
between the fender/body and the battery ground terminal (at least I
presume that was his reference point). That improvement is
meaningless as none of the important systems in the vehicle are
grounded to the fenders.

There is one exception to the above statement. If your radio antenna
is mounted on the fender and you are getting ignition noise on AM,
then adding a good ground bond to the fender "might" reduce the noise.

I might also add that the improvement he shows will only be temporary.
His method of constructing the ground straps will allow them to
corrode in about a year. The heat shrink won't protect them from road
salts and moisture. The straps should be made out of braided wire and
the connectors should be crimped AND soldered. Heat shrink will make
them look pretty but isn't necessary.

Jack


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dbu`

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Since: Aug 14, 2007
Posts: 97



(Msg. 10) Posted: Sat Sep 08, 2007 3:10 pm
Post subject: Re: Drive-by-wire throttle hesitation with 5 speed manual? [Login to view extended thread Info.]
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zammy

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Since: Apr 09, 2007
Posts: 10



(Msg. 11) Posted: Sat Sep 08, 2007 3:12 pm
Post subject: Re: Drive-by-wire throttle hesitation with 5 speed manual? [Login to view extended thread Info.]
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it may, but on the lotus elise, there's really no latency.
the power train on the elise is pure toyota.
and it's TBW.
that's a reason i bought mine.
sam


"SQ" wrote in message

>
> Does the infamous throttle hesitation problem created by Drive-By-Wire
> exist on 5th generation 2AZ-FE Camry with 5 speed manual transmission?
>
> In other words, does DBW latency affect both auto and stick shifts?
>
 >> Stay informed about: Drive-by-wire throttle hesitation with 5 speed manual? 
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ruprect

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Since: Sep 08, 2007
Posts: 1



(Msg. 12) Posted: Sat Sep 08, 2007 3:29 pm
Post subject: Re: Drive-by-wire throttle hesitation with 5 speed manual? [Login to view extended thread Info.]
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On Sep 7, 11:25 pm, SQ wrote:

>
> It's also not clear if the throttle delay is a result of
> DBW technology or Toyota's new Variable-Valve Timing
> technology.

Dunno, mine has both, and like I say I notice little if any
lag.. I don't really see how the VVT could have much to do
with it. It might effect power at certain rpms, but shouldn't
effect the actual throttle response.
MK
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