Connecting fault reader V.A.G 1551 and selecting a function — VW

Test requirements => Page
01-46.

Notes:

The ABS function in the control unit is switched off during self-diagnosis.
If a fault occurs in the system while one of the functions "Interrogate fault memory" or "Read measured value block" is being performed it will be recognised. This is indicated by the warning lamp -K47 lighting up and aids the tracing of the "sporadic faults".
The fault memory can be erased after successful interrogation and repair.

Remove cover for diagnostic connector.
With ignition switched off connect V.A.G 1551 with cable V.A.G 1551/3 to diagnostic connectors.

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

1) displayed alternately

Note:

If there is no display, check self- diagnosis connection.

=> Current Flow Diagrams, Electrical Fault Finding and Fitting Locations

Notes:

Depending on the program, additional operating information can be printed out by pressing the HELP key of V.A.G 1551.
The ⇒ key is used for the continuation of the program sequence.
The PRINT key is used to switch on the printer (indicator lamp in key lights up).

Switch on ignition.
Switch on printer with the Print key (indicator lamp in key lights up).
Press key -1- for "Rapid data transfer" operating mode.

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

Press keys -0- and -3-;
03 inputs address word of the vehicle system "Brake electronics" to be tested.

Rapid data transfer (Q)
03 Brake electronics
Indicated on display:

Confirm entry with Q key.

Rapid data transfer
Tester transmits address word 03
Display after address word 03 has been entered:

Note:

If a fault occurs in the communication link between fault reader V.A.G 1551 and the control unit, one of the following four displays will appear.

K -wire not switching to earth/positive
HELP
Press the HELP key to obtain a printout of the possible causes of fault.

No signal from control unit
Check wiring of diagnosis line "K".

=> Current Flow Diagrams, Electrical Fault Finding and Fitting Locations

Check voltage supply and earth connection to control unit -J 104.

=> Current Flow Diagrams, Electrical Fault Finding and Fitting Locations

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

Communication problem
If this display appears:

Fault remedy

=> Current Flow Diagrams, Electrical Fault Finding and Fitting Locations

Press ⇒key

1J0 907 379 D ABS 20 IE CAN
0001
⇒
Coding 13504
WSC
XXXXX
If the communication link between fault reader V.A.G 1551 and the control unit is fault-free the control unit -identification is shown on the display

Indicated in display:

Control unit identification number, e.g. 1J0 907 379 D

Allocation of control unit

=> Replacement parts catalogue

system code, e.g. ABS ITT AE 20 GI at ABS Teves 20 GI e.g. ABS 20 IE at ABS ITT Mark 20 IE
Data bus present. ( CAN )
Code No. of control unit, e.g. 13504; encoding control unit =>Page
01-71 the workshop code (FC) =>operating instructions V.A.G 1551 fault reader

Note:

If the control unit identification number does not appear in the display check diagnostic wiring.

=> Current Flow Diagrams, Electrical Fault Finding and Fitting Locations

Press ⇒key

Note:

A list of the possible functions is printed out after pressing the HELP key:

Pressing the ⇒ key returns the V.A.G 1551 program to its initial setting.

Rapid data transfer HELP
Select function XX
Display:
(Function selection, e.g. 02 - interrogate fault memory)

=>Page
01-44
"Overview of selectable functions"