Post Cat Correction - 2001 Audi S4

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phila_dot

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	Re: Post Cat Correction - 2001 Audi S4 « Reply #30 on: February 15, 2012, 11:56:50 AM »

You could try CDLATV=0. I haven't looked through it completely, but it should remove post cat O2's completely from O2 sensor aging tests.


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nyet

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	Re: Post Cat Correction - 2001 Audi S4 « Reply #31 on: February 15, 2012, 12:10:52 PM »

I'm not sure I understand... I don't have CLATV set to zero, but my o2s are removed and everything is fine.

is this because I'm using 73 and not 5?


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masterj

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	Re: Post Cat Correction - 2001 Audi S4 « Reply #32 on: February 15, 2012, 12:24:23 PM »

Quote from: phila_dot on February 15, 2012, 11:56:50 AM

You could try CDLATV=0. I haven't looked through it completely, but it should remove post cat O2's completely from O2 sensor aging tests.

Ofcourse if I disable aging mixture test (CDLATV=0) then I can pass readliness (same as zeroeing all the tests - makes them passed in vcds), but this is bad solution, because, then you'll never know if your front o2 sensor is bad or not.


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phila_dot

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	Re: Post Cat Correction - 2001 Audi S4 « Reply #33 on: February 15, 2012, 12:39:54 PM »

Quote from: masterj on February 15, 2012, 12:24:23 PM

I haven't looked into it completely, but it was my understanding that CDLATV only affected if the rear sensors were considered in the primary O2 aging test.


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masterj

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	Re: Post Cat Correction - 2001 Audi S4 « Reply #34 on: February 15, 2012, 12:44:39 PM »

Quote from: phila_dot on February 15, 2012, 12:39:54 PM

I haven't looked into it completely, but it was my understanding that CDLATV only affected if the rear sensors were considered in the primary O2 aging test.

That is not what I found out... CDLATV and CDLATP both are aging tests for front sensor. CDLATV is "Mixture Test" and CDLATP is "Two-Point Control Test". If you zero out CDLATV you're zeroing half of the aging test...


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phila_dot

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	Re: Post Cat Correction - 2001 Audi S4 « Reply #35 on: February 15, 2012, 02:35:59 PM »

Quote from: masterj on February 15, 2012, 12:44:39 PM

ATV monitoring is evaluating mixture control based on post cat O2 sensor readings. atv is calculated in LRHK. With post cat O2 sensors removed or faulty you will not want to utilize the sensor voltage in this test.

My final conclusion without confirmation from logging is CLRHK=5 and CDLATV=0.


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