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OBD Scanners Discussions on using On Board Diagnostic (OBD) scanners/ Diagnostic Equipment related to TDIs

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Old November 23rd, 2016, 04:35   #31
Diesl
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Quote:
Originally Posted by zaphod99 View Post
I'm experiencing odd behaviour after adding the "soot" gauge to Torque.
The gauge seems to work ok (reading 70g), then after < 1min, Torque disconnects from my Bluetooth OBD2 adapter (cheapo aliexpress ELM327 clone) and will not re-connect until I power cycle the OBD2 adapter. If I remove the "soot" gauge all is back to normal, and no more disconnects. Weird.
Any idea what might be causing this?
I think I have a different OBD2 adapter laying around, which I will try and see if it behaves the same way. My phone is a Nexus 4, if that makes any difference.
Any news on the results with the other adapter? 70g soot seems an implausible value: regeneration should start at about 17g. If I remember correctly, 40g is the upper limit beyond which regeneration on the road is disabled, and 45g is the absolute limit, beyond which even a VW shop can't recover the DPF. I'm not saying that 70g can't occur as a reading, after all the car calculates this number, it is not a direct measurement, but it seems out of the normal range.
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Old November 24th, 2016, 05:37   #32
zaphod99
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Quote:
Originally Posted by Diesl View Post
Any news on the results with the other adapter? 70g soot seems an implausible value: regeneration should start at about 17g. If I remember correctly, 40g is the upper limit beyond which regeneration on the road is disabled, and 45g is the absolute limit, beyond which even a VW shop can't recover the DPF. I'm not saying that 70g can't occur as a reading, after all the car calculates this number, it is not a direct measurement, but it seems out of the normal range.
I finally got around to trying my other adapter this morning, and no disconnect issue with this one. However, my readings are erratic and out of the range you described.

At startup, the reading was 63g and fluctuated (up and down) by a few g, and once went wildly up to 166g before coming back down to the 60's. At about 10km into my 50km commute I noticed a regen in progress. At this point the reading was 86g, which held constant during the regen and for most of the remainder of the drive. Near the end of the drive, the reading finally moved off of 86g down to the high 40's to low 50's, with one wild swing to 187g. I'm not sure what to make of these readings.

Last edited by zaphod99; November 24th, 2016 at 07:51.
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Old November 24th, 2016, 14:02   #33
Diesl
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Happy Thanksgiving! It might be a good idea to double check the formula:
((R49<8)+R50)/100 . A missing or misplaced parenthesis could really screw things up.
R49*2.56 + R50/100 should also work.

Except for the numbers, the behavior you describe sounds similar to what I see:
Constant readout during a regeneration and for a while (50 miles for me) afterwards, then a jump to a lower number (usually 6 to 8 gram for me - haven't checked it that often) and slow increase from there.

The erratic jumps also point in the direction of a wrong math formula, or that your car's computer has gone bonkers. Maybe VW tried a special improved cheating firmware in yours...
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Old November 28th, 2016, 07:27   #34
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Quote:
Originally Posted by Diesl View Post
Happy Thanksgiving! It might be a good idea to double check the formula:
((R49<8)+R50)/100 . A missing or misplaced parenthesis could really screw things up.
R49*2.56 + R50/100 should also work.
Except for the numbers, the behavior you describe sounds similar to what I see:
Constant readout during a regeneration and for a while (50 miles for me) afterwards, then a jump to a lower number (usually 6 to 8 gram for me - haven't checked it that often) and slow increase from there.
The erratic jumps also point in the direction of a wrong math formula, or that your car's computer has gone bonkers. Maybe VW tried a special improved cheating firmware in yours...
I verified that I had the correct formula. I also tried the alternate formula "R49*2.56 + R50/100" and the result is the same.
Back in post #25 @bud_128 reported readings as high as 200g, so I'm not alone. Maybe both our ECUs have gone bonkers
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Old November 28th, 2016, 21:55   #35
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Mhmm. Maybe that means my formula only works for certain TDIs. Yours is a 2013 Passat, and bud_128 drives a 2014 something. Maybe also a Passat? A 2014 Jetta or Golf should have exactly the same engine as my 2012 wagon (which is really more a Golf than a Jetta, despite what the nameplate says). Bummer.

If you wanted, you could check what Torque lists by itself for Mode 6 ('Test Results') data. Maybe in your car the soot is a few bytes over?
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Last edited by Diesl; November 28th, 2016 at 22:05.
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Old November 30th, 2016, 06:32   #36
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Quote:
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If you wanted, you could check what Torque lists by itself for Mode 6 ('Test Results') data. Maybe in your car the soot is a few bytes over?
Absolutely right. I watched PID 06b2 in "test" mode, and although the sequence '7E82736' was not there, it was evident that the 2 bytes of interest were the last byte on line "5:" and the first byte on line "6:". I adjusted my formula to '((R40<8)+R41)/100' and now I'm seeing reasonable values in the 7-18g range. FYI my pre-regen reading topped out at x'0706'.

Last edited by zaphod99; November 30th, 2016 at 06:43.
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Old April 18th, 2017, 21:41   #37
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Update: I had the opportunity to test my torque setup on a 2015 golf wagon TDI, and everything seems to work, incl. EGTs, manifold pressure (requested and actual ), fuel pressure, DPF soot load etc.. In fact, the soot load was 24 gram, as the car had only ever been driven very short distances, and I saw it start a regeneration.
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Old August 11th, 2017, 11:21   #38
krambriw
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Smile dpf's and more

Hello, just found this great place!
In our family we have 3 tdi's. One of them, the old Golf needed the dpf to be cleaned. I went to a garage where they had a pretty new equipment for this purpose. It took around 3 hours and I was astonished afterwards; the engine was running much smoother, more quiet, no more diesel smell that I could feel earlier, really big difference. The thing was this car had 260.000 km's, mostly on highways, so there was a lot of ash in the dpf. Luckily, we did not have to replace it, the cleaning was enough.

Anyway, this raised my awareness a bit, I decided to look for some tool that could be used to read the soot level. Ended up with an ELM327 and Torque. Besides that I have also tried with VAG DPF.

The communication with the ecu is working fine with all 3 cars but the reading in Torque makes me uncertain. Our A6 shows a soot level around 13-14 when using VAG DPF. Using Torque with the formulas mentioned in this thread gives readings 50 to 70. So I assume the formula is not perfect for the A6 2.0 tdi from 2013.

Is there anybody who could explain what the response in the picture really means? Is the soot level in there somewhere?

Kind regards, Walter


Last edited by krambriw; August 12th, 2017 at 22:38.
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Old August 12th, 2017, 10:54   #39
Diesl
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Hi Walter, would you mind resizing your giant picture so one can still read the text on this page?

The response in the screen shot seems short. If you look at my first post in https://torque-bhp.com/forums/?wpfor...topic&t=7739.0 (the torque forum companion thread), the response I'm getting has quite a few more bytes.

Did you post the complete response to the 'test command', or did it get chopped off?
What are you seeing under 'test results in torque for B2C5?
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Old August 13th, 2017, 01:30   #40
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Hi,
Yes, that is the complete response, the same length from both Audi's. Also there is no data received for command B2C5, same for both cars
If the elm327 adapter seems to be working ok, aslo included a screenshot from VAG DPF below (from the A3)
Best regards, Walter

B2C5 from both


From Audi A6


From Audi A3


VAG DPF from Audi A3

Last edited by krambriw; August 13th, 2017 at 01:41.
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Old August 13th, 2017, 06:28   #41
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Torque also has a selection in the main menu for 'test results'. It takes a while to fully populate, but that is where I initially found the B2C5 field with a value in gram. What do your cars show there?
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Old August 13th, 2017, 07:26   #42
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I did a test with the A6, waited like ten minutes, this was all that was shown, maybe it doesn't work with my cars ecu's

Kind regards, Walter

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Old August 13th, 2017, 15:27   #43
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That's odd. 3 variables is all the A6 provides as mode 6 data?
Is there an A6 subforum here? Maybe they know more. It could be your elm-clone that is acting funny. Does everything else work (built-in torque functions)?
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Old August 14th, 2017, 07:56   #44
krambriw
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The elm seems to be working ok, a raw display is populating a lot of values, but it might be that something int the elm compatibility is missing anyway (it's reported as ver 1.5). Same result for both the A3 and the A6. It can read fault codes. It's the "test result" that won't play

Anyway, I think I will be satisfied with the VAG DPF since that is working, it was my main interest to be able to check the dpf

Thanks for all suggestions,
Best regards, Walter
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