Question to a Ross-tech VCDS owner

[Ole-dk]

Hello
I have a Ross-tech VCDS with the VCDS software 11.11 and a USB HEX + CAN cable (HEX + CAN Dual-K & CAN <->USB)
My A2 is an ATL with GRJ gearbox

When i select "Options" , "Test" and "Save" I get connetions to:
K1:OK
K2:OK
CAN: Not ready
see attached file "VCDS-Option-connection.JPG "

I can see in the SP240, page 40, that the A2 do have CAN-BUS-System
see attached file "sp240-p40.jpg"
Question A:
Schould the CAN be "Not ready", or schould the CAN be "OK" ?
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I can read Address:
Address 01: Engine
Address 08: Auto HVAC
Address 15: Airbags
Address 17: Instruments
Address 46: Central Conv.
Address 56: Radio
Address 76: Park Assist
Address 77: Telephone

I can not read Adress:
Sddress 02: transmission (I have manual 5 speed transmission)
Address 03: ABS
Address 16: Steeringwheel (I suppose this is ESP)

Question B:
Can other people with Ross-tech VCDS (HEX + CAN Dual-K & CAN <->USB) read Address: 03 ?
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I can see in the SP240 page 40 that the CAN-BUS for ABS/ESP is running at 500 kBaud, where the other CAN-BUS'es (comfort and display) is running at 100kBaud.

 

[spike]

I'm no expert but think the reason is that A2's have a first generation canbus system which is not used for the diagnostics. (sp240 shows the separate diagnostic links to each module)

I can read address 03.
Suspect 02 is only for 1.2 tdis with the semi auto gearbox and 16 is for multi function steering wheels.

Cheers Spike

 

[Ole-dk]

Hello Spike

Thank you for fast answer.


Concerning question A:
this means, that CAN connection shall be "Not ready", which is as it has to be.

Concerning question B:
I shall be able to read Address 03.
This send the problem back to my A2.
I have been in contact with Ross-tech support, and they gave the following ANSWER:
>> Normally VCDS should have no issue with talking to the ABS module in
>> your car. We have several customers who own similar cars and never
>> reported any issues and all the Auto-Scans we have here show
>> perfectly fine communication with those ABS/ESP modules.
>>
>> Since all other control module do not report any ABS/ESP related
>> errors, we have to believe that only diagnostic related communication
>> is cut off and that theb normal ABS/ESP functionality works fine.
>>
>> This does imply that there are no power supply issues or other "normal"
>> wiring issues and leaves only a few options. Either the diagnostic
>> wire
>> (k-line) to that control module is disconnected or the module is
>> stuck and does not reply on communication attempts from a diagnostic tool.
>>
>> Usually what I would suggest is disconnecting the ABS module for a
>> while, so it basically gets a hard reset. After that I would see what
>> happens and if it starts talking again. If that doesn't work, that
>> might include more research like using a multimeter and tracing the wiring.
>>
>> In any case, this is pretty much up to you. Since everything is
>> working just fine you may even let it sit the way it does right now.

And they seem to have seen the right problem, since You confirm, that I have to be able to read Address 03 and both ABS and ESP works fine and selfcontrol works fine.
I will follow their advice, and try to figure out where the problem is.
Beginning with disconnecting the J104 ABS/ESP module and clean the connection-plug.