CAN IDs: What do they mean?

Hello everyone,

I used a terminal program and a CAN-2-RS232 adapter to read out some CAN values from an Audi. Unfortunately, I have no information about what these refer to.

I found the mileage on ID 65D.

I think listing them all here would be too much.
Can anyone help me find information about things like speed, engine RPM, fuel level, etc.? Unfortunately, searching in various forums hasn't yielded much. Or are those values not available there?

The Comfort-Can is used because it is easily accessible and has already been installed as an 'external' interface.

Here's the translation:

'It's an Audi S8, manufactured in 2007.'

Thank you very much.

Unfortunately, I cannot help you with Audi-related requests.
The IDs for Volkswagen are likely to be different.

I think so too!
Apparently, no one here can help me.

Hello Martin,


- Audi A5 Baujahr 2008:
Geschwindigkeit:
0x3c3 8 02 A0 03 10 11 80 10 50 // 10km/h Low=D1, High=D2 / 100 = v (0x3A0/100d)
0x3c3 8 02 F3 15 10 11 2C 34 50 // 56km/h 0x15F3/100d

Auidi A6 Baujahr 2008
0x355 8 14 C8 07 00 00 00 7D 7C // ca. 10 km/h Low=D1, High=D2 / 200 =v
0x355 8 14 2E 2D 00 00 00 74 74 // ca. 60 kmh 0x2d2e / 100d

Audi A4 Modell 2008:
0x3C3 8 02 D2 03 10 11 B4 0D 90 // ca. 10 km/h Low=D1, High=D2 /100 = v (0x03D2/100d)
0x3C3 8 02 72 0B 10 11 22 1D 50 // ca. 30 km/h
I think so too!
Apparently, no one here can help me.

I'm sorry, I don't have any records for your vehicles. However, you should be able to determine the speed/revolutions per minute by logging it yourself.

I can give you some ID numbers of other Audis, maybe something will match what you're looking for.

The usual suspects for speed issues are likely the IDs:
0x351, 0x359 to be


All information is provided without guarantee .

Regards,
Andi.

Hello Andi,

Thank you very much.
Unfortunately, the IDs are not included either.

I have received the following IDs on the CAN bus:
0A0 171 182 290 2C2 2C5 300 355 357 35D 35F 373 382 396 3B6 3C2 3C3 3E2 3E5 3F7 3F8 400 402 403 404 405 406 407 409 40A 40B 40C 40D 40F 411 413 414 415 417 419 41A 41C 41D 443 451 455 459 492 493 4B8 4BE 501 513 515 543 545 555 579 581 592 596 5A6 5E7 5E9 5EB 607 60B 60D 611 615 617 626 629 657 659 65D 65F 6A5 6A6 6A7 6AB 6AD 6AF 6D9 6DC 6F4 6FC A96 B58


'Where 65D represents the mileage.' I have already found that.
Maybe someone here can help me.

Hmmm... Isn't 3C3 supposed to be included? My mistake.
The information about the speed is actually in the last two bits for me.

Do you have any more information about the IDs of the A5 or A4 models?

... 355, I can still see it at your place.

Are you sure your hardware is functioning correctly?

In the standard frame format, there are no IDs greater than 0x7FF, as the identifiers in this format consist of only 11 bits.


I still need information about the ignition, lights, reverse gear, and LFB buttons. Unfortunately, that's all I have for now. I'll check later to see what else I can find.

Regards,
Andi.

Everything should be working correctly.
The IDs also have a 't' added to the beginning.

I'm unfortunately new to this field, and I'd be happy to be corrected if I'm wrong.

Hello.
Here are the IDs that I can assign based on information from VW:

0x3C3: Steering angle.
0x400 to 0x43F: Ring where control units register themselves (e.g., 0x436 for navigation, 0x439 for radio, etc.).
0x555: Various information about motor/generator, etc.

I also have a log file for an Audi here... I couldn't see those IDs there.
Did you actually check out the CAN Comfort system?
Specifically, the last two IDs seem to suggest that it is the drive controller (CN).

Hello everyone,

balooba wrote:

Did you actually look at the CAN comfort features? Specifically, the last two IDs seem to indicate that it is the drive CN.

In some vehicles, the gateway reflects individual messages unchanged from the powertrain CAN bus to the comfort CAN bus, or vice versa.

Regarding speed:
In VAG vehicles, the speed is typically transmitted in the CAN bus drive system in increments of 0.01 km/h (i.e., a value divided by 100). However, the values are always represented using the upper 15 bits, and the bit 0 of the least significant byte (LSB) is used as a flag (e.g., to indicate the sign for wheel speeds from the ESP system).
"In some cases, the values are apparently mirrored directly to the CAN bus for comfort functions (then divided by 200 after removing the least significant bit). In other cases, the gateway shifts the values one bit to the right to remove a flag (then divided by 100)."


Best regards,
Ingo

Hello.

You are right about the speed.

Bits 1 through 15 = speed. The highest speed is then, logically, 326.39 km/h.
Bit 0 anchors the signal source. 0 = speedometer, 1 = ABS sensor.
It's usually always on, unless the ABS sensors on the front axle are defective.

For older vehicles, the 0x351 code is used (for cars with TP 1.6).
For newer vehicles, the codes are 0x527 and 0x359 (for vehicles with TP 2.0).
It should be noted that the 0x527 value is only processed by the radio. (Keywords: GALA / Video in Motion)

The 0x359 provides signals for navigation, climate control, etc.

If the signal source is set to 'Tacho' (speedometer), all components that process the 0x359 signal will enter emergency mode.

Regards,

Stefan.