jim beam <spamvortex@bad.example.net> wrote in
news:07SdnVrMkfRj78ranZ2dnUVZ_jmdnZ2d@speakeasy.ne t:

> Matt Ion wrote:
>> Richard Blaine wrote:
>>> "Andy" <blueflame1965@hotmail.com> wrote in message
>>> news:09OdndWeBLxH2MranZ2dnUVZ8uqdnZ2d@pipex.net...
>>>> Can you tell me what "Drive by Wire" is please, on new honda accord
>>>> 2.2i-CTDi, thanks.
>>>>
>>>> Haven't heard of that, cheers.
>>>>
>>>> AE
>>>
>>> Control of something by electrical impulse over a wire rather
>>> tugging on a cable-- like in the old days there was one from your
>>> gas pedal to the butterfly in the carburetor that opened it wider
>>> when you stomped down. When you tromp on the gas pedal these days,
>>> it sends a signal to the fuel injector and fuel pump to step up the
>>> flow.
>>
>> In most cars, there is still a cable that attaches to the butterfly
>> in the throttle body. Injector operation is controlled by the ECU
>> based on the airflow measured through the throttle body or manifold,
>> and assorted other sensors' input, rather than direct input from the
>> pedal.
>
> none of the above guys. drive by wire is simply having the throttle
> operated by a computer controlled servo. it means there is no
> mechanical connection to the pedal any more - just a sensor that acts
> as input for the ecu, and the ecu uses that in conjunction with a
> bunch of other info to calculate how wide to open the throttle. it's
> especially advantageous for automatics as it means you can de-throttle
> when the gear changes. injection really has nothing to do with it.
>

No,"DRIVE by wire" is electrically controlled STEERING.
You are describing "throttle by wire".

My 2003 Nissan Sentra SE-R SpecV has throttle by wire;the throttle plate is
controlled completely by the ECU. Because of some wierd problem,my RPMs
sometimes rev up to 1500-2000 RPM and hunt around there for a second,then
slowly drop back to idle,without my foot even on the gas pedal.It's caused
a CEL of "idle RPM too high".I either need a new PS pressure switch or new
programming of the ECU(according to a service bulletin),which can of course
only be done by Nissan dealers;....at some charge.

I might be able to get the reprograming done under a different safety
recall at no cost.


--
Jim Yanik
jyanik
at
kua.net