Post by nightskygolfr on Feb 29, 2024 17:40:31 GMT
Hey folks, so a couple months back I followed the steps in this thread to code the exhaust flaps always open (using my OBDEleven) and the process went smoothly (as per the instructions I was able to untick Bit 2 under Byte 09 Hex 04) and it's been working great all this time.
www.vwvortex.com/threads/coding-exhaust-flaps-open.9534174/
Now I recently went back to my OBDEleven do some additional coding for another software mod, when I had noticed in the history of my previous coding (judging by the Engine Long Coding string) it showed that somehow during the exhaust flaps coding steps I did earlier, it had made two changes rather than just one (see below).
Investigating and researching this further, I came to understand that the first value change seems to signify that under Byte 00, it changed from Hex 09 (Bits 0 and 3 checked) to Hex 00 (both Bits 0 and 3 unchecked). And then subsequently under the second change was the right one for the process, Byte 09 changed from Hex 04 (Bit 2 checked) to Hex 00 (Bit 2 unchecked).
Discovering this, I immediately went back and changed the incorrect Byte 00 from Hex 00 (Bits 0 and 3 unchecked) back to Hex 09 (Bits 0 and 3 checked). After starting the car again I did not notice any obvious changes of how it seems to drive and sound the same as before (flaps still remain always open and the car seems to operate as usual).
Now...I really have no idea how that first incorrect change was made as I definitely recall unticking just one Bit (Bit 2) when I did the steps back in December, but in any case, even though I went back and corrected the change, I now have a slight concern.
Since I've been driving with that incorrect Byte change for a couple thousand miles since I coded the exhaust flaps in December, I have pushed a bit on the car a few times and even did launch control twice since then. Now I haven't noticed any particular obvious issues but, my concern is, since this is engine related coding, what if that incorrect Byte may have caused some less obvious issue?
My question to the forum is, does anyone happen to know what all the Bytes (and relevant Hex values) mean in the entire Engine Long Coding string (or at least the incorrect one that I had made)?
We know that in Byte 09, the Hex value 04 means it triggers the physical exhaust valves to modulate (as per factory), and Hex value 00 means it doesn't physically modulate them. But in order to understand what the incorrect Byte change that was there earlier affected, does anyone have any clue what the rest of Engine Long Coding string mean and could affect?
I'm hoping that as someone initially discovered that exhaust flap coding that we do have someone with insight that could advise further on the rest of the values.
Any info would be very much appreciated.
www.vwvortex.com/threads/coding-exhaust-flaps-open.9534174/
Now I recently went back to my OBDEleven do some additional coding for another software mod, when I had noticed in the history of my previous coding (judging by the Engine Long Coding string) it showed that somehow during the exhaust flaps coding steps I did earlier, it had made two changes rather than just one (see below).
---------------------------------------------------------------
Long coding
Control unit: 01 Engine
Old value:
092500322466010E30040000000000000000000000000000
New value:
002500322466010E30040000000000000000000000000000
Mileage: 6008 km
Date: 2023-12-13 13:37
---------------------------------------------------------------
Long coding
Control unit: 01 Engine
Old value:
002500322466010E30040000000000000000000000000000
New value:
002500322466010E30000000000000000000000000000000
Mileage: 6008 km
Date: 2023-12-13 13:45
---------------------------------------------------------------
Long coding
Control unit: 01 Engine
Old value:
092500322466010E30040000000000000000000000000000
New value:
002500322466010E30040000000000000000000000000000
Mileage: 6008 km
Date: 2023-12-13 13:37
---------------------------------------------------------------
Long coding
Control unit: 01 Engine
Old value:
002500322466010E30040000000000000000000000000000
New value:
002500322466010E30000000000000000000000000000000
Mileage: 6008 km
Date: 2023-12-13 13:45
---------------------------------------------------------------
Investigating and researching this further, I came to understand that the first value change seems to signify that under Byte 00, it changed from Hex 09 (Bits 0 and 3 checked) to Hex 00 (both Bits 0 and 3 unchecked). And then subsequently under the second change was the right one for the process, Byte 09 changed from Hex 04 (Bit 2 checked) to Hex 00 (Bit 2 unchecked).
Discovering this, I immediately went back and changed the incorrect Byte 00 from Hex 00 (Bits 0 and 3 unchecked) back to Hex 09 (Bits 0 and 3 checked). After starting the car again I did not notice any obvious changes of how it seems to drive and sound the same as before (flaps still remain always open and the car seems to operate as usual).
Now...I really have no idea how that first incorrect change was made as I definitely recall unticking just one Bit (Bit 2) when I did the steps back in December, but in any case, even though I went back and corrected the change, I now have a slight concern.
Since I've been driving with that incorrect Byte change for a couple thousand miles since I coded the exhaust flaps in December, I have pushed a bit on the car a few times and even did launch control twice since then. Now I haven't noticed any particular obvious issues but, my concern is, since this is engine related coding, what if that incorrect Byte may have caused some less obvious issue?
My question to the forum is, does anyone happen to know what all the Bytes (and relevant Hex values) mean in the entire Engine Long Coding string (or at least the incorrect one that I had made)?
We know that in Byte 09, the Hex value 04 means it triggers the physical exhaust valves to modulate (as per factory), and Hex value 00 means it doesn't physically modulate them. But in order to understand what the incorrect Byte change that was there earlier affected, does anyone have any clue what the rest of Engine Long Coding string mean and could affect?
I'm hoping that as someone initially discovered that exhaust flap coding that we do have someone with insight that could advise further on the rest of the values.
Any info would be very much appreciated.
