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

The vehicle system tester V.A.G 1552 can be used instead of the fault reader V.A.G 1551, however V.A.G 1552 does not have the facility for making a print-out.

With ignition switched off, connect the fault reader to the diagnostic connectors on relay point I using cable V.A.G 1551/1 as follows:
Black plug connected to black diagnostic connector.
White plug connected to white diagnostic connector.
Blue plug not used.

Note:

If the display remains blank, check connections of diagnostic connector=>Page
01-232
.

V.A.G - SELF-DIAGNOSIS
HELP
1 - Rapid data transfer1)
2 - Flash code output1)
Indicated on display:

1)
appears alternately

Notes:

The PRINT key is used for switching on the printer (the indicator lamp in the key lights up when the printer is switched on).
Depending on the programme, additional operating information can be printed out by pressing the HELP key of V.A.G 1551.

Switch on printer by pressing Print key of fault reader.
Press key -1- for "Rapid data transfer" operating mode.

Rapid data transfer
HELP
Enter address word XX
Indicated on display

Note:

The address word selects the control unit of the on-board system that you wish to test with the fault reader. It is made up of two digits, which are given in the relevant sections of this Manual.

For instance, press keys 03 to enter the address word for "Brake electronics".

Rapid data transfer
Q
03 Brake electronics
Indicated on display

Confirm input with Q key.

Rapid data transfer
Tester sends address word 03
Indicated on display after entering address word 03

Note:

If a fault occurs in the diagnostic communication between the fault reader and the control unit, the display will show one of the four following messages:

K-wire not switching to earth/positive
HELP
Press the HELP key to obtain a print-out of the possible causes of the fault.
No signal from control unit
Test wiring of diagnostic connectors=>Page
01-232
.
Test power supply and earth connection to control unit -J104.

=> Current flow diagrams, Electrical fault finding and Fitting locations

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

Fault in communication build-up
Indicated in display

Rectifying fault=>Page
01-234
.

XXX XXX XXX
YYY YYY YY YY YY
ZZZ
⇒
Coding VVVVV
WSC WWWWW
If the diagnostic communication between the fault reader and the control unit is established and works properly, the display will now show the control unit identification (X), the system designation (Y), the hardware and software version (Z), the coding (V) and the workshop code (W)=>Page
01-156
, Interrogating control unit version.

Notes:

The ⇒key is used for moving forward within the programme
The control unit index can only be changed by fitting a new control unit

=> Parts list

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.

Rapid data transfer
HELP
Select function XX
Indicated on display