AUDI A2 unable to connect to ECU but can connect to HVAC etc

[Quantumtokoloshi]

I am trying to read a DTC, but I am not able to connect to the Engine ECU, via hex used the autoscan and direct to the control module but no module found, I am able to connect to the HVAC module okay. My Foxwell OBD scanner also does not connect. I have seen mention of baud rate being an issue on some A2 ECUs, can anyone offer advice?

Thanks.

 

[Dr Sheldon]

Post an Autoscan FIRST !!

 

[Quantumtokoloshi]

Here is the Autoscan.

,26,May,2024,10:49:59:41118
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 24.5.0.0 (x64)  HEX-V2 CB: 0.4643.4
Data version: 20240429 DS355.0
www.Ross-Tech.com





--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 8Z - Audi A2 (2000 > 2005)
Scan: 01 02 03 08 15 16 17 18 37 45 46 56 57 75 76 77
 
-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels:
   VCID: 55F789660C1B5F42545-4800

No Faults Found
  or DTCs not supported by controller
  or a communication error occurred

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: None
   Part No: 8Z2 820 043
   Component: A2-KLIMAVOLLAUTOMAT 0406 
   VCID: 75B7E9E6ECDB3F42745-24D2

1 Fault Found:
00818 - Sensor for Evaporator Outlet Temperature (G263)
            30-00 - Open or Short to Plus

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: None
   VCID: 55F789660C1B5F42545-4E20

No Faults Found
  or DTCs not supported by controller
  or a communication error occurred

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels:
   VCID: 55F789660C0B5F42545-47E4
   Note: Excessive Comm Errors


End----(Elapsed Time: 04:32, VBatt start/end: 11.7V/11.6V. VIgn 11.6V)-----

 

[Uwe]

That looks like some kind of interference on the K-line (the single wire diagnostic bus in that car).

What works in this car and what doesn't?

Does this car have any aftermarket equipment? E.g. an aftermarket radio, or perhaps a GPS tracking device?

-Uwe-

 

[Quantumtokoloshi]

It does have an aftermarket radio, should I try it with the radio disconnected?

 

[Dr Sheldon]

should I try it with the radio disconnected?

Yes

 

[Quantumtokoloshi]

Thanks, will do.

 

[Quantumtokoloshi]

Thanks, that did the trick.

 

[Uwe]

Thanks, that did the trick.

Post a new scan please.

Then find the K-Line coming from the car to the radio and make sure it isn't connected to anything on the radio.

-Uwe-