It is quite simple to test the resistance across the 
terminals of the sensor


On Thu, 28 Jun 2007 17:57:51 -0400
  Walter Banks <walter@bytecraft.com> wrote:
> 
> Herbert Graf wrote:
> 
>> On Thu, 2007-06-28 at 14:58 +0100, Alan B. Pearce wrote:
>> > >I believe the Vovlos suffered from failure of the 
>>electronic
>> > >throttle module rather than the ECU.  This is part of 
>>the
>> > >"drive by wire" system which I have always considered 
>>a very
>> > >poor idea.  Give me a throttle cable any day of the 
>>week.
>> >
>> > OK, but in a simplified way I see the two as 
>>synonymous, in that the 'wires'
>> > are still going into a lump of electronics that 
>>control the engine ...
>> >
>> > It may be a separate module that does the throttle 
>>control, to the module
>> > that does the engine management, but I suspect they 
>>are all inside the same
>> > box (but I haven't looked under the hood of a Volvo to 
>>find out) ...
>>
>> I doubt that very much.
>>
>> It's very common on cars that each "feature" has it's 
>>own "computer".
>> I'd personally be surprised if a throttle by wire 
>>feature was contained
>> in the main ECU. It takes quite a while for the auto 
>>industry to
>> "integrate" separate modules.
> 
> Herb,
> 
> You are partly right. Most cars also have cruise control 
>that is
> also part of the throttle by wire often handled 
>separately. Throttle
> information goes into the engine controller.
> 
> None (or very few) have cables going to a carburettor 
>because
> most are now using fuel injection to meet the EPA 
>objectives.
>Fuel injectors are now mostly modulated to control mixing 
>as
> air is drawn (forced) in to control burning, emissions, 
>knock
> maintenance (a lean spot will burn knock producing 
>carbon
> particles off cylinder walls) and  flame front control 
>inside the
> engine. In some cases mixing happens uniquely for each 
>cylinder.
> 
> You can't set these things up with a screwdriver any 
>more.
> But you can reflash the code.
> 
> Walter Banks
> --
> Byte Craft Limited
> Tel. (519) 888-6911
> http://www.bytecraft.com
> email walter@bytecraft.com
> 
> 
> 
> 
> 
> 
> 
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