Connecting fault reader V.A.G 1551 and selecting function (reading out control unit version) — VW

Connecting
fault reader
V.A.G 1551
and selecting function (reading out control unit version)
All fuses according to current flow diagram OK.
Battery voltage OK (at least 9 V).
Note
The airbag system is switched off during self-diagnosis.
The fault memory can be erased only after a repair has been made and the memory has been read.
With ignition switched off, connect
fault reader
V.A.G 1551
to the diagnostic connector using the
diagnostic cable
V.A.G 1551/1
as follows:
Unclip diagnostics connection cover under heating and ventilation controls.
First connect black plug on
diagnostic cable
V.A.G 1551/1
to black agnostic connector in vehicle (voltage supply).
Indicated on display:
V.A.G self-diagnosis HELP
1-Rapid data transfer*
or
V.A.G self-diagnosis HELP
2-Flash code output*
Is displayed alternately
Note
If the display remains blank, do not connect the white plug! If this is the case, check the voltage supply for the
fault reader
V.A.G 1551
according to current flow diagram.
Connect white plug of
fault reader
V.A.G 1551
to white diagnostic connector in vehicle. The blue plug is not required.
Note
Additional operating information depending on the programme can be printed out by pressing the
HELP
key on the
fault reader
V.A.G 1551
.
The
→
key is used for advancing the programme sequence.
The
PRINT
key is used for switching on the printer (warning lamp in key lights up).
Switch on ignition.
Press key
1
for
“rapid data transfer”
mode.
Indicated on display:
Rapid data transfer HELP
Input address word XX
Press keys
1
and
5
(the address word of the vehicle system to be tested
“Airbag”
is entered with 15).
Indicated on display:
Rapid data transfer Q
15 Airbag
Confirm entry with the
Q
key.
and then the display shows e.g.:
The control unit identification number is displayed:
1H0 959 656 AIRBAG IS 55
Note
If one of the adjacent fault messages appears in the display, the possible causes of the fault can be printed out with the HELP key.
Rapid data transfer HELP
Control unit not answering!
Ignition must be switched on.
Rapid data transfer HELP
K wire does not switch to positive!
Faults have occurred at the start of or during the programme (external sources of faults?).
Rapid data transfer ->
No signal from control unit!
Check diagnostic cables and also voltage supply and earth connection.
Rapid data transfer ->
Fault in communication
After rectifying the possible causes of the fault, once again enter the address word 15 for
“Airbag”
and confirm with the
Q
key.
Indicated in display after entering the address word 15:
Rapid data transfer
Tester sends the address word 15
and then the following appears in the display:
Control unit identification number is displayed.
1H0 959 656 AIRBAG IS 55
Press
→
key.
Indicated on display:
Rapid data transfer HELP
Select function XX
Note
An overview of the possible functions will be printed out when the
HELP
key is pressed:
Overview of functions
Page
01 - Interrogate control unit version
Chapter
02 - Read fault memory
Chapter
05 - Erase fault memory
Chapter
06 - End output
Chapter
Only the functions listed can at present be used for self-diagnosis.
When the
→
key is pressed, the
fault reader
V.A.G 1551
program will return to its initial position.
Shown in display (function selection, e.g. 02 - Read fault memory):
Rapid data transfer HELP
Select function XX