[V8] Coolant Temp Sensor Values (was New O2 Sensor- Whhhhaaaatt)

[Ingo Rautenberg]

Dave,

No, they're two different sending units.  According to ETKA, the rear  
one (white housing) PN# 035 919 369 M Thermal switch -10/20/80 C  2  
pin M14x1,5

The front one is 077 919 501 (black housing) temperature sender 120 C  
also 2 pin M15x1,5

HTH

On a side note, I'm wondering if I'm developing too much fuel  
pressure in the system, as I hear more and more the purging/whistle  
sound of a valve by the rear of the car by the tank and I always have  
a nice pressure of escaping air when removing the fuel cap.  Much  
more so the with the '91.  This is in the '93.

Ingo

On Jul 18, 2006, at 11:14 AM, dsaad at icehouse.net wrote:

> I think the sensor at the right rear head (for the ECU) and the  
> sensor at the
> left front head (for the guage) are the same part number - right?
>
> If so, maybe there is a resistance/voltage chart for this sensor?
> I seem to recall using this info to test the ECU sensor.
>
> I believe the Service Training Manual is the correct source of  
> information for
> this one.
>
> Dave
>
>
> Quoting Ingo Rautenberg <i.rautenberg at waratap.com>:
>
>> Hmm.  I have conflicting values here, guys.  I checked the Four
>> volume manual and under the fuel or ignition section I confirmed it
>> said that the coolant temp sensor at the back of the head should read
>> between 1.46 and 3 Ohms (not k Ohms).  But according to the earlier-
>> released Service Training Book with the graphic scale chart, this
>> MUST be a typo.
>>
>>  From what I can discern, according to this, the values should be ~
>> 2k to 3k at room temperature.  This value drops to ~90 Ohms at 130 C
>> and rises to ~ 6k at 0 C / 32 F and up to 13k at -22 F / -30 C
>>
>> Anyone want to confirm?
>>
>> On Jul 17, 2006, at 2:56 PM, Ingo Rautenberg wrote:
>>
>>> Steve,
>>>
>>> Since i'm at work right now I can't verify.  But that's what I  
>>> recall
>>> from the Factory Manual reading of yesterday.  Yeah, I looked twice,
>>> too.  I thought the resistance value would/ should be much higher...
>>>
>>> Will recheck when I get home.
>>>
>>> On Jul 17, 2006, at 2:33 PM, Buchholz, Steven wrote:
>>>
>>>> ... you can infer the values from the OBD section on the EFI
>>>> system.  The coolant temp sensor is one of the ten parameters that
>>>> the ECU logs.  I can read the values out using ProDiag ... should
>>>> also be possible from VAG-COM.  The advantage of using this method
>>>> is that you see the value that the ECU sees ... and you don't get
>>>> your hands dirty ... or burned!
>>>>
>>>> It is a bummer to hear that the value is so low ... are you sure
>>>> this is right Ingo?  Resistance measurement in such a low range is
>>>> prone to errors due to connector resistance.
>>>>
>>>> Steve B
>>>> San José, CA (USA)
>>>>>
>>>>> Yes to the sensor on the back of the head.  The initial Service
>>>>> training document even has a graphic on the proper sensor Ohm
>>>>> readings, which, surprisingly are not in the four book volume.
>>>>> There
>>>>> it only states that the sensor reading on a 'cold' engine at room
>>>>> temperature should read between 1.5 and 3 Ohms.  (mine read at
>>>>> 1.46 -
>>>>> close enough).  Now I need to check the resistance when it's  
>>>>> hot...
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>>
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>
>
>
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