Oxygen Sensor

[David Vanden]

Well apparently the button on the bottom wasn't getting pressed because the
location of the switch must have slipped, so adjusting the location of the
bottom switch tomorrow will be a good place to start.

What was weird was after I pressed the bottom switch manually the readings
for both sensors began reading infinity when not pressed.  Just before that
the top one was reading 20.82 mohms of resistance when not pressed and the
bottom one was reading approx. 3.82 mohms when not pressed.  I will have to
see what they read tomorrow.  At least I know what I have to do with the
bottom switch.  Thanks all.  Good Night.

On Tue, May 26, 2015 at 9:39 PM, Huw Powell <audi at humanspeakers.com> wrote:

> What DO they read?
>
> Please give us numbers when you take measurements...
>
> You don't have to buy a smoke machine!  EVERY repair shop worth its salt
> will have one, and they are simple to set up.
>
> All they do is take very low air pressure from a compressor line and heat
> up some special oil to make the smoke, IIRC. Pull a vacuum line and pump
> the smoke into it.
>
> On 5/26/2015 9:11 PM, David Vanden wrote:
>
>> Well I am pretty sure I got them wired correctly.  The only problem, as
>> I mentioned is that they are not reading infinite when open.
>>
>>   There has got to be a way to locate vacume leaks that does not require
>> buying a smoke machine.  However, if I did is there a model that you
>> recommend.  They come in all shapes and sizes and prices on EBAY.
>> Anyway, I will debate it more in the morning.
>>
>> David
>>
>> On Tue, May 26, 2015 at 8:17 PM, Huw Powell <audi at humanspeakers.com
>> <mailto:audi at humanspeakers.com>> wrote:
>>
>>     Well, they are just switches.
>>
>>     When closed they should read zero or as close as possible
>>     (definitely less than one ohm).  When open your meter should just
>>     read off scale/infinite.
>>
>>     They won't "vary" anything, the idle switch tells the ECU to use the
>>     ISV to maintain about 800 rpm (and kills fuel if it is above ~1400
>>     rpm). The WOT switch tells the ECU to go into open loop with a
>>     richer mixture for enhanced acceleration.
>>
>>     - Huw
>>
>>     I hope you got them wired correctly.
>>
>>
>>         I soldered a set of the throttle body switches I got.
>>         Unfortuneately,
>>         they read they had some resistance as opposed to being infinite
>>         when the
>>         switches were not activated.  I don't know what happened to them
>>         in the
>>         process of pairing and soldering them.  However, they were both
>> at a
>>         perfect 0 when activated so I used them.  I don't think they would
>>         increase the idle?
>>
>>         This is a 1987 Audi 4000 Quattro.
>>
>>
>>