VAG-COM Data: Interpretation and Analysis

Hello,

After my post from this afternoon was deleted without any comment, I'm trying again.
Just one more time. If a moderator believes that I am violating a policy in that regard, then...
If I have said or done something offensive, please let me know.



Hello everyone,

After repeatedly experiencing problems with my V6 TDI engine (AKN, Passat 3B), I have...
I borrowed a VAG-COM device from an acquaintance and started experimenting with it.
And already, the first questions arise (yes, I've already watched the general documentaries about it).
(read):

The TDI-Graph module tells me that my ignition timing is significantly retarded.
outside the tolerance range). Could this be related to the timing belt replacement that was done a few thousand kilometers ago?
Does having a turbocharger mean it can no longer reach its top speed? Immediately after the change, it was...
The engine was definitely properly adjusted at the VW dealership, but I wonder if it can readjust itself.
adjust?

When monitoring the "Air intake temp." (yes, I have installed the US version 6.07), it shows...
The intake air temperatures are always close to the outside temperature. When the car is stationary, it increases.
langsam an, im Fahrbetrieb liegt sie gerade mal 1-2 Grad über der Außentemp. D"as" is indeed.
It's quite nice, but I don't think my liquid cooler can cool it that well; it's probably more of a...
Sensor broken, right?

"The error log always shows an error: 'CAN gateway: incorrect encoding' (identified as code 00005)."
Kann man den Wert irgendwie umsetzen, damit dieser Fehler verschwindet? Does he even...?
It seems to be working fine, and everything appears to be functioning correctly (e.g., the multifunction display, CD changer, etc.).

Best regards,
Matthias.

After repeatedly experiencing problems with my V6 TDI (AKN, Passat 3B), I borrowed a VAG-COM from a friend and started experimenting with it, and the first questions are already arising (yes, I have already read the general documentation for it):

Hello,

After my post from this afternoon was deleted without any comment, I'm trying again.
Just one more time: If a moderator believes that I am violating a policy, then...
If I have inadvertently offended or stepped on someone's toes, please let me know...

It's probably because the Vag-Com license is not transferable. Strictly speaking, from a licensing perspective, this is not legally okay. To advertise something like that is quite problematic. In this case, your acquaintance will probably have to provide you with the necessary support.

Hello,

Well, you shouldn't be quite so strict about it. He didn't demand support from the manufacturer (Ross-Tech), he simply asked a normal question.
There's actually nothing against it. For now, it doesn't matter to me where he got the system from, since it seems to be properly licensed.

He can buy a support key.

Regarding your questions:
Yes, the adjusted injection timing is almost certainly related to the timing belt replacement.

Regarding the intake air temperature: I consider a difference of 1-2°C above the outside temperature to be unrealistic. A good intercooler cools the intake air by approximately 20K above the outside temperature when operating at full boost pressure. Be aware that the temperature increase is gradual, so the full boost pressure needs to be applied for several seconds before you'll see any change.

I can't really say anything about the CAN gateway off the top of my head.

Best regards, Rainer.

Actually, there's nothing really against it. For now, it doesn't matter to me where he got the system from, since it apparently has a proper license.

It's okay .


Regarding the CAN gateway, I can't say anything off the top of my head.

Re-encode the CAN gateway using the same encoding (00005) again. It will then automatically search for all 'participants.' If that doesn't improve the situation, try using the 'neutral' encoding of 00000. However, more information would also be helpful, such as the year of manufacture, the part number of the instrument cluster, etc.

Dauerschrauber wrote:

...when I use the TDI-Graph module, it tells me that my ignition timing is significantly retarded (well outside the tolerance range). Could this be related to the timing belt replacement a few thousand kilometers ago? Is that why it's no longer reaching its top speed? Immediately after the replacement, the engine was definitely properly adjusted at the VW dealership, but could it have readjusted itself?

Did you also choose the right motor?

Dauerschrauber wrote:

while monitoring the "Air intake temp." (yes, I have installed the US version 6.07), it shows The intake air temperatures are always close to the outside temperature. When the car is stationary, it increases. langsam an, im Fahrbetrieb liegt sie gerade mal 1-2 Grad über der Außentemp. D"as" is indeed. It's quite nice, but I don't think my liquid cooler can cool it that well; it's probably more of a... Sensor broken, or what?

Which measurement block (MB) and which field are you specifically looking at?

Dauerschrauber wrote:

In the error memory, there is always an error "CAN gateway: incorrect encoding" (which is displayed as 00005).

Basically, check the coding and, if necessary, change it. Even if the coding is correct, try recoding it as described before, as in your case, it's most likely a software error in the instrument cluster.

Hello everyone,

Thank you very much for your help! Just to reassure you about licenses: that is...
a completely legally purchased professional version, because my acquaintance is on vacation and therefore doesn't have time.
He even lent me his equipment so I could take my own measurements. Here are the exact data related to the measurements.
I'll send you the block information later. I'm also planning to take a longer highway trip tomorrow.
to really put the whole system to the test.
Regarding model selection in TDI-Graph: where can I adjust this setting? The only menu I can find is...
gefunden hatte, bei dem man ein best. Modell auswählen kann, war der Autoscan. At TDI-Graph.
According to the manual, only the fuel temperature and injection timing (data points 2 and 9 from the measurement values) are displayed.
block 000) are plotted against each other. I can gladly log the data and provide it with attachments if you like.

Best regards,
Matthias.

Dauerschrauber wrote:

Regarding model selection in TDI-Graph: where can I adjust that? The only menu I found where you can select a specific model was the Autoscan function.

When starting TDI-Graph, select the engine variant in the bottom right corner.

Sorry guys, but where exactly is the V6 listed in the TDI graph?

Allow Group 4 to switch the "start time" from early to late (I believe this is in the basic settings, and requires the full version). The "early" setting should be between 4 and 0 (2 plus or minus 2).

I can't explain the temperature either; it's significantly higher. The sensor would be located in the lower left corner (from the driver's perspective).

Herr Antje wrote:

Sorry guys, but where exactly is the V6 listed in the TDI graph?

It's included in the current software version, but not yet in the older versions.

Sebastian@OpenOBD wrote:

It's included in the current software version, but not yet in the older versions.

Hi!

I just checked, and my version is 1.4.1.0, which is the same as the one you mentioned.
The most up-to-date information is available at Ross-Tech. Unfortunately, I don't have a way to input the engine type.
found there

Best regards,
Matthias.

[Translating...]

Wie gesagt, unten rechts.

[Translating...]

Hi!

Sebastian@OpenOBD wrote:

Wie gesagt, unten rechts.

Schande über mich! Jetzt habe ich es auch gefunden, und heute morgen gleich mal eine neue
Testfahrt gemacht. Das Resultat fiel allerdings ernüchternd aus: die Grafik schaut beim AKN
zwar ganz anders aus, aber das Ergebnis bleibt gleich: kaum Streuung innerhalb der Wolke,
aber alle Punkte oberhalb der grünen Linie im Graph (=Einspritzung zu früh). Da werde ich
wohl nochmal zur Werkstatt fahren müssen, um das hinbiegen zu lassen (oder kann man das
auch mit VAG-COM selbst machen?)

Der Temp.fühler im LLK (oder die Luftführung) scheint auch eine Macke zu haben: bei 15 Grad
Außentemp. zeigt er nach längerer Laufzeit im Leerlauf Werte um 40 Grad an, wenn ich dann
auf die Autobahn fahre und dort ständig über 2500 (bis 4000) Upm fahre, sinkt dabei die Temp.
langsam wieder bis auf ca. 20 Grad. In diesem Drehzahlbereich müßte doch der volle Ladedruck
anliegen und die Temp. entsprechend ansteigen statt zu fallen, oder habe ich da einen Denkfehler?
Der Ladedruck an sich ist da, sonst würde ich ja nicht auf 180 km/h beschleunigen
können (mehr ging nicht wegen des Verkehrs)....

Wenigstens etwas positives gibt es zu berichten: beim CAN-Gateway habe ich die Codierung
von 00005 auf 00007 geändert (=Automatik+ABS-Bremsen+Airbags), und schon sind die
Einträge im Fehlerspeicher verschwunden.....

Viele Grüße,
Matthias

[Translating...]

Dauerschrauber wrote:

Hi! Da werde ich wohl nochmal zur Werkstatt fahren müssen, um das hinbiegen zu lassen (oder kann man das auch mit VAG-COM selbst machen

Außer Vag-Com brauchst du auch noch etwas Werkzeug

Linker(Fahrtrichtung) Zahnriemenverkleidung ab, Pumpenriemen entspannen. Mit 10er Schlüssel die Schrauben am NW-Rad lösen und ganz leicht in Richtung spät drehen. Festdrehen, Spannrolle auf Markierung und festdrehen. Abdeckung wieder drauf und warmfahren. Dann mit VAG-COM wieder prüfen. Wiederholen bis in Toleranz.

[Translating...]

So,

ich habe heute noch ein wenig Daten gesammelt und sie mit den Sollwerten im fachartikel
verglichen. Dabei sind mir einige deutliche Abweichungen aufgefallen, ich hoffe jemand kann
sie mir erklären. Gemessen wurde zunächst im Stand/Leerlauf bei Betriebstemp. von ca. 80 Grad,
danach Vollgas auf ebener Strecke mit Tiptronic im 4. Gang:

Meßwerte bei Leerlauf (gemittelt):

Meßwertblock 3: 742/min, Luftmasse-Soll 279 mg, Ist 282 mg, Taktrate AGR 35%
Meßwertblock 4: 742/min, ES-Beginn Soll -0,6, Ist +0,2, Taktverh. ES-Ventil 100,2%
Meßwertblock 11: 742/min, Ladedruck Soll 1050mbar, Ist 1010mbar, Taktverh. LD-Ventil 85%

Meßwerte bei Vollgas (gemittelt):
Meßwertblock 3: 3300/min, Luftmasse-Soll 860 mg, Ist 830 mg, Taktrate AGR 95.5%
Meßwertblock 4: 3300/min, ES-Beginn Soll +7,5, Ist +7,6, Taktverh. ES-Ventil 44%
Meßwertblock 11: 3300/min, Ladedruck Soll 2100mbar, Ist 2100mbar, Taktverh. LD-Ventil 54%

Der MWB 11 schaut einigermaßen normal aus, was mich aber stutzig macht sind die Werte bei MWB 3
und vor allem MWB 4, die deutlich von den Werten im Fachartikel abweichen.

Was ist an dieser blöden Karre nur faul? (Abgesehen von eingelaufenen NW, die mein Auto
natürlich auch betroffen haben .... )