Speedometer Calibration Skoda Roomster

Hello,
habe schon ein wenig hier im Forum gesucht, aber leider nichts passendes gefunden.
Und zwar schreibe ich gerade eine Studienarbeit, bei der ich das Geschwindigkeitssignal des Komfort-CAN benötige.
The vehicle is a Skoda Roomster. I've gotten this far and know that it's related to message ID 351, and the information is stored in the first and second bits. However, the exact speed isn't being displayed correctly. During a test drive, I noticed that the indicated speed was always about 10-15% lower than the actual speed.

Does anyone know how this signal is structured?
It would really help me.
Thank you in advance.

Best regards,
MarkusThe vehicle is a Skoda Roomster. I've already made some progress and know that this relates to message ID 351, and the information is stored in the first and second bits. However, the exact speed isn't being displayed correctly. During a test drive, I noticed that the indicated speed was consistently about 10-15% lower than the actual speed.That would really help me a lot.
Thank you very much in advance.

Sincerely,
MarkuThank you very much in advance.

Sincerely,
MarkuBest regards,Markus.

mit 2 bit wirst auch nicht allzugrosse unterschiede sehen.

hello

Mach mal ne Messfahrt mit hohen Geschwindigkeiten, da wird das ganze genauer.
Mess 10kmh, 20, 30 bis 130. alle 10kmh.
Mach dir ein Diagramm Messwerte über Geschwindigkeit (x-y) müsste dan halbwegs linear sein.
DOkay, so calculate the average value, and then you'll have the conversion factor.
Then, create a small program in VB or whatever language you prefer that reads these values, converts them using the factor you calculated, displays the speed, and then check how accurate your results are.t.Then you create a small program in VB or whatever language you prefer that reads these values, converts them using the factor you calculated, displays the speed, and then checks how accurate your results are.

The Škoda Roomster still has the 1.6 TP engine.
Die Geschwindigkeit ist im Byte 2 und 3 der ID 0x0351.
Die ID 0x351 sollte immer mit einer Länge von 8 Byte senden.
Let's assume the following values:

Byte 2: 0x12
Byte 3: 0x34

Calculation: Byte 3.Byte2 (Simply appending Byte 2 to Byte 3)
This results in 0x3412 in hexadecimal.
Converting this to decimal: 13330
Now, divide by 192: 69 km/h

Please note: The speed signal from the CAN bus may differ from the displayed value on the speedometer, as tolerances are taken into account or calculated..Let's assume the following values:Calculation: Concatenate byte 3 to byte 2 (simply append byte 2 to byte 3).So, 0x3412 in hexadecimal.Convert the following to decimal: 13330.Now divide by 192: 69 km/h.Please note that the speed signal from the CAN bus may differ from the value displayed on the speedometer, as tolerances are taken into account or factored in for that purpose.

@baloopa
Woher weißt du das, hast du das sePlease provide the text you would like me to translate from German to English. I will then give you only the translation, without any explanations.ber raus gefunden?
Sure, here's the translation:

'Best regards.'

Hi!

Meinst Du die ID oder den Wert?

Die ID habe ich geloggt (T5 Bj 2005 / Passat).
Der Wert (HEX in DEZ) ergibt sich von allein, da ich in Mathe aufgepasst habe , man es leicht nachprüfen kann und es sich ebenfalls aus der 'Rumrechnerei' auf Bit Ebene ergibt.
Many of you make the mistake of reading CAN messages in HEX... It's very convenient, but it's a complete mess.
If you were to approach it bitwise, everything would be much easier ... especially with real messages, meaning where the TP version comes into play at VW, for example, communication between the radio and MFA, etc.
Just as a suggestion....Many of you make the mistake of reading CAN messages in hexadecimal format... It's convenient, but it's complete nonsense.Just a suggestion for you to consider.Just a suggestion for you to consider...

Hi!
Many of you make the mistake of reading CAN messages in hexadecimal format... It's convenient, but it's complete nonsense.

Hey, I always read all the values in HEX because you can practically see the bits right there .