Connecting fault reader V.A.G 1551 and selecting address word — AUDI

Use can also be made in place of the fault reader V.A.G 1551 of the vehicle system tester V.A.G 1552 or the vehicle diagnostic, testing and information system VAS 5051. Information cannot however be printed out when using the vehicle system tester V.A.G 1552.

Notes:

ABS function is deactivated in control unit during self-diagnosis. ABS warning lamp -K47 flashes.
Fault memory can be erased following completion of repair work and fault memory interrogation.
Pay attention to test requirements for system concerned.

With ignition switched off, use cable V.A.G 1551/3 to connect fault reader to diagnostic connector, which is located on left on underside of dash panel.

V.A.G self-diagnosis
HELP
1-Rapid data transfer 1)
2-Flash code output1)
Indicated on display:

1) Displayed alternately

Notes:

Check connections of diagnostic connector if display remains blank.

=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder

Switch on printer by pressing PRINT key. Lamp in Print key lights when printer is on.
Depending on the program, additional operating instructions can be printed out by pressing HELP key on V.A.G 1551.

Switch on ignition.
Press Print key on fault reader to switch on printer.
Press key 1 for "Rapid data transfer" mode.

Rapid data transfer
HELP
Enter address word XX
Indicated on display:

Note:

Address word selects control unit with which fault reader is to exchange data. The address word is made up of two digits and is indicated in the appropriate Section of the Workshop Manual.

Example: Pressing keys 03 enters address word "Brake electronics".

Rapid data transfer
Q
03 - Brake electronics
Indicated on display:

Confirm entry with Q key.

Rapid data transfer
Tester transmits address word 03
Indicated on display following entry of address word 03:

8Z0907379A
ESP
20
CAN
V003
⇒
Code 10758
WSC XXXXX
Adjacent display then appears (example):

Display shows the following:

Control unit identification number

e.g. (8Z0907379A)

Control unit assignment

=> Parts List

System designation (ESP)
Data bus (CAN)
Current control unit code
e.g. (10758)
Current control unit version e.g. V003

Encoding control unit =>Page
01-63

Workshop code =>Operating instructions for V.A.G 1551 fault reader

Press ⇒ key.

Rapid data transfer
HELP
Select function XX
Indicated on display:

Note:

One of the following four messages appears on the display if a problem occurs with the communication link between fault reader and control unit:

K-wire not switched to earth/positive
HELP
Print out list of possible causes by pressing HELP key.
No signal from control unit
Check connections of diagnostic wire "K".

=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder

Check power supply and earth connection to ABS with EDL control unit -J104.

=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder

Fault in communication link
If adjacent display appears:

Rectify fault.

=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder

After eliminating possible causes of trouble, enter address word 03 for brake electronics again and confirm with Q key.

XXX XXX XXX
YYY YYY YY YY YY
ZZZ
⇒
Code VVVVV
WSC WWWWW
If communication between fault reader and control unit has been established properly, control unit identification (X), system designation (Y), hardware/software version (Z), code (V) and workshop code (W) will appear on display.

Notes:

Next step in program sequence can be selected by pressing ⇒ key.
Details of the individual vehicle systems to be tested are given in the appropriate Section of this Workshop Manual.
Control unit index can only be influenced by replacing control unit.

=> Parts List

Check diagnostic wire if control unit identification number does not appear on display.

=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder

Press ⇒key.

Rapid data transfer
HELP
Select function XX
Indicated on display: