Quote:
Originally Posted by schriss
Quote:
Originally Posted by jirka330i
it reports 30e9 error and stops stratified; one thing which I tested was an encoding of "virtually new" nox catalyst in ista...which than leads msd80 to reset clogging value...
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I did this few days ago too. It might be "temporary" but not bad, I mean temporary as in as long as the new one actually lasts, so 100k? and then code new cat again. Small thing to do..
I think ECU has no means to know the state of cat unless there are sensors after the cat.
I think it is all approximation and calculation. ECU knows how many regen cycles that cat can handle or roughly how many miles it can last or how much nox ppm it can take. That's why is says "aging" not "aged/clogged/needs_replace".
So encoding nox cat replace is probably identical result as actually putting a new one in AND encoding. Difference will be only in emissions.
Again, the above is what I assume/think. |
Quote:
Originally Posted by jirka330i
Quote:
Originally Posted by schriss
They might be doing the simplest thing: change 3000 to 9999999999999999999.
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I guess the simplest thing would be to block a nox sensor hole in the exhaust by one M20x1,5 screw and connect specially adjusted (to a can bus protocol standard) mp3 player to send a special binary nox song to the msd80 :-) |
Quote:
Originally Posted by Andystobbs
The Denox system exists because of a large spike in emissions of NOx at the transition between homogenous and stratified charge modes. In order to control these emissions the Denox catalyst was fitted and the effectiveness of the system is monitored by the NOx sensor.
The engine doesn't need any of the denox system to run lean or stratified but crucially the ECU on standard software DOES need the information reported from the Nox sensor. Moreover it needs to see the correct info from the Nox sensor or it will assume the Denox system is faulty, cannot effectively remove oxides of nitrogen and therefore disable all but traditional homogenous mode.
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Quote:
Originally Posted by schriss
Quote:
Originally Posted by jirka330i
it reports 30e9 error and stops stratified; one thing which I tested was an encoding of "virtually new" nox catalyst in ista...which than leads msd80 to reset clogging value...
|
I did this few days ago too. It might be "temporary" but not bad, I mean temporary as in as long as the new one actually lasts, so 100k? and then code new cat again. Small thing to do..
I think ECU has no means to know the state of cat unless there are sensors after the cat.
I think it is all approximation and calculation. ECU knows how many regen cycles that cat can handle or roughly how many miles it can last or how much nox ppm it can take. That's why is says "aging" not "aged/clogged/needs_replace".
So encoding nox cat replace is probably identical result as actually putting a new one in AND encoding. Difference will be only in emissions.
Again, the above is what I assume/think. |
The nox sensor is after the nox cat, so the assumption is not accurate I'm afraid