DPR current/O2 sensor voltage

[jdbubb at ix.netcom.com (Dan Bubb)]

A one wire sensor is just the signal wire
Never seen a two wire sensor
A three wire sensor is signal, heater +, heater gnd.
A four wire sensor is signal, signal gnd, heater +, heater gnd
Normally the signal is grounded throught the sensor body and the exhaust system.
A five wire sensor is WB and needs a controller.

So, if you use a four wire sensor you'd just need to add a gnd wire for the signal gnd.
Dan

----- Original Message ----- 
From: "C Boyko" <roccit_53@scirocco.cs.uoguelph.ca>
To: "Allyn" <amalventano@sc.rr.com>
Cc: "scirocco list" <scirocco-l@scirocco.org>
Sent: Tuesday, September 21, 2004 6:00 PM
Subject: Re: DPR current/O2 sensor voltage



> Cathy,
>
> get o2 sensor from www.oxygensensors.com (cheap).
> they have a crimp-in connector type that uses the factory harness (even
> cheaper)

I'll ikely get one where I got the last one.
>
> the wifes jetta (motronic) had the same sensor (3 wire) as any 16v cis-e
> car
> i've ever seen.

Well, the Passat has a four wire, different PN than either a Rocc or GTI,
I'd imagine the Jetta matches the latter. What's the fourth wire for?
>
> p.s. you're reading o2 sensor voltage from the green wire to battery
> ground,
> right?

Pretty  sure I'm reading it correctly, yes.
>
> p.p.s. connecting an AA battery to the green wire (using ground for -),
> should have an impact on DPR current (it should swing the other way).
>
Okay, I'll try that trick.

> hth
> Al
>
> ----- Original Message -----
> From: "C Boyko" <roccit_53@scirocco.cs.uoguelph.ca>
> To: "Allyn" <amalventano@sc.rr.com>
> Cc: "C Boyko" <roccit_53@scirocco.cs.uoguelph.ca>; "scirocco list"
> <scirocco-l@scirocco.org>
> Sent: Tuesday, September 21, 2004 7:35 AM
> Subject: Re: DPR current/O2 sensor voltage
>
>
>> If the O2 was failing, but not totally dead, it would push the DPR
>> current
>> up though, right? When I unplug the DPR, it changes the sound of the
>> engine, but unplugging the O sensor makes no difference at all. It
>> should
>> though, right? But if it's sending negligible voltage, there would be
>> little to no difference?
>>
>> Oh, one more question. The 16V Passat O2 sensor is 030 906 265K, for the
>> 2L GTI (the headache's engine donor) and the stock 16V Rocc, they are
>> both
>> 034 906 265 (F or C). SO do you suppose it's just a wire length
>> difference? (The fact that the number is the same would indicate the
>> Motronic and CIS-E versions are the same???) I haven't gone out to look
>> at
>> the potential donor to see where the sensor is.
>> Anyone done junkyard O2 sensorectomy from a Passat?
>>
>> Anyway, I have some reading to do at work today, see if I can sort it
>> out.
>>
>> Cathy, rich beyond words...
>>
>>
>>> the o2 reading and the DPR reading dont make sense. if the o2 was
>>> running
>>> that lean, the DPR should be pegging high (about 20mA, not fluctuating)
>>> in
>>> an attempt to compensate. you can try to nudge it down to the 5-10mA
>>> range.
>>> if it hangs out between 5-10mA with minor fluctuation, chances are your
>>> o2
>>> is working just fine. if it was actually bad, the feedback loop would
>>> be
>>> broken, and you would likely have no fluctuation of the DPR current.
>>> Al
>>>
>>>
>>> ----- Original Message -----
>>> From: "C Boyko" <roccit_53@scirocco.cs.uoguelph.ca>
>>> To: "Allyn" <amalventano@sc.rr.com>
>>> Cc: "scirocco list" <scirocco-l@scirocco.org>
>>> Sent: Monday, September 20, 2004 9:15 PM
>>> Subject: Re: DPR current/O2 sensor voltage
>>>
>>>
>>> Okay, a revision, gotta love the whole "fleet" syndrome. Testing the
>>> Beetle's battery prior to a trickle charge revealed it to be at 17.4V,
>>> and
>>> it wouldn't start, so a multimeter "tech procedure" was in order. A
>>> trip
>>> to town, and new battery/fuse for the meter reveals that the DPR is
>>> REALLY
>>> at 9.9-11.2 mA. And the O2 is between .32 and .03V. Mostly around .04
>>> or
>>> so, with occasional blips to tenths of a volt.
>>>
>>> SO>>>the O2's indicating lean, or that it's dying/ dead, and the DPRs
>>> indicating rich, correct? So replace the O2 sensor and tehn check the
>>> mix
>>> again? Or gently CCW on the mix to get it in the 5-10mA range? What say
>>> ye? (I'm going back under her, aren't I? Figured as much)
>>>
>>> And one more thing, assuming the 16V "Passat convertible" has a decent
>>> O2
>>> sensor, it's sensor will work, right? (That I can look up)
>>>
>>> And thanks once again.
>>>
>>> Cathy
>>> 16V Scirocco and some other stuff that won't start....
>>>
>>>
>>>> DPR needs to be fluctuating (within about 5mA), and should average
>>>> about
>>>> 5-10 mA. sitting stuck at .1 and .2mA makes me think its riding out of
>>>> range.
>>>> as for which way does what -
>>>> high DPR is rich (cold start enrichment is ~60mA). however, a low DPR
>>>> number
>>>> at idle (close to 0mA), means that the mechanical adjustment is too
>>>> rich
>>>> itself (computer is compensating in the lean direction). as far as
>>>> adjustment, CW = rich, which causes DPR to go DOWN (cpu adjusts in the
>>>> lean
>>>> direction, towards 0).
>>>>
>>>> for your situation, you should go CCW, and it shouldnt take much,
>>>> since
>>>> your
>>>> o2 sensor is close to .5 anyhow. ensure there is nothing attached to
>>>> the
>>>> o2
>>>> sensor while adjusting the DPR.
>>>>
>>>> hth
>>>> Al
>>>>
>>>> ----- Original Message -----
>>>> From: "C Boyko" <roccit_53@scirocco.cs.uoguelph.ca>
>>>> To: <scirocco-l@scirocco.org>
>>>> Sent: Monday, September 20, 2004 6:32 PM
>>>> Subject: DPR current/O2 sensor voltage
>>>>
>>>>
>>>> Okay, I've looked in the Bentley, and can't find it, and figured
>>>> someone
>>>> could give me a quick answer.
>>>>
>>>> I'm wanting to adjust my mix on the 16V, and finally got a harness
>>>> hooked
>>>> up to measure DPR current, right now it's fluctuating between .1 and
>>>> .2
>>>> mA
>>>> and I seem to remember the goal being just rich of .5 if I could
>>>> remember
>>>> whether higher is richer or leaner. I know it's "righty richy" on the
>>>> Allen key.
>>>>
>>>> So question one is does low = rich or lean, and what's the target
>>>> value?
>>>>
>>>> Anyway, I'll check the O2 input first, it should be 5ish too, on
>>>> whatever
>>>> voltage scale, right? (0 being dead and 10 being full rich?) I have it
>>>> written somewhere, but it's been two years since I last checked it.
>>>> Sorry
>>>> to be so non-technical here, but the car feels like it wieghs 4000 lbs
>>>> at
>>>> the moment, I'd like to reduce the dog factor. It's gotta be near
>>>> where
>>>> it
>>>> can't adjust out of it.
>>>>
>>>> That makes question two "what is ideal value for the O2 signal?"
>>>>
>>>>
>>>> Thanks.
>>>>
>>>>
>>>> Cathy
>>>> 1987 2L 16V Scirocco - the Silver Headache
>>>> 1979 1.8L 10:1 8V - Klaus- sounds like 0.33 of a Chevelle
>>>> "The light at the end of the tunnel is probably an oncoming train"
>>>>
>>>> _______________________________________________
>>>> Scirocco-l mailing list
>>>> Scirocco-l@scirocco.org
>>>> http://neubayern.net/mailman/listinfo/scirocco-l
>>>>
>>>>
>>>
>>>
>>> Cathy
>>> 1987 2L 16V Scirocco - the Silver Headache
>>> 1979 1.8L 10:1 8V - Klaus- sounds like 0.33 of a Chevelle
>>> "The light at the end of the tunnel is probably an oncoming train"
>>>
>>> _______________________________________________
>>> Scirocco-l mailing list
>>> Scirocco-l@scirocco.org
>>> http://neubayern.net/mailman/listinfo/scirocco-l
>>>
>>>
>>
>>
>> Cathy
>> 1987 2L 16V Scirocco - the Silver Headache
>> 1979 1.8L 10:1 8V - Klaus- sounds like 0.33 of a Chevelle
>> "The light at the end of the tunnel is probably an oncoming train"
>
>


Cathy
1987 2L 16V Scirocco - the Silver Headache
1979 1.8L 10:1 8V - Klaus- sounds like 0.33 of a Chevelle
"The light at the end of the tunnel is probably an oncoming train"

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