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Interrogating and erasing fault memory > < Features of self-diagnosis

A4 Mk1

Connecting vehicle diagnosis and service information systemVAS 5052 and selecting engine electronics control unit
Connecting vehicle diagnosis and service information system -VAS 5052- and selecting engine electronics control unit
Special tools and workshop equipment required
t  Vehicle diagnosis and service information system -VAS 5052-
Test conditions
l  The battery voltage must be at least 11.5 V.
l  Fuses OK.
l  Earth connections on engine and gearbox OK.
l  Switch off air conditioner.
l  On vehicles with automatic gearbox the selector lever must be in “P” or “N” position.
Procedure
   
–  Open rear ashtray (in centre console) and remove cover for diagnostic connector.
–  Connect vehicle diagnosis and service information system -VAS 5052-.
  WARNING
t  Test equipment must always be secured on the rear seat and operated from that position by a second person.
t  If test equipment and measuring instruments are operated from the front passenger's seat and the vehicle is involved in an accident, the person sitting in this seat could be seriously injured when the airbag is triggered.
Depending on the function required:
–  Switch on ignition or start engine.
Selecting operating mode:
  A24-0028
–  Select function “Vehicle self-diagnosis”.
  A87-0312
Indicated on display:
Selecting vehicle system:
–  Select “Engine electronics” on display.
  Note
t  Vehicle system selection prompt appears in display zone -1-.
t  “Scrolling” screen display with bar -2- permits display of vehicle systems (for all vehicle models and equipment levels) which are envisaged for self-diagnosis but are not currently visible on the screen.
  A87-0313
Wait until “Select diagnosis function” appears in zone -1- on display.
The control unit identification and coding appear in display zone -2-, e.g.:
  A87-0314
t  8D0907401..
Control unit number (refer also to Parts catalogue)
t  2.5 ltr.
Engine capacity
t  V6
V-engine / 6 cylinders
t  TDI
Turbo diesel
t  G or no display
Vehicle with or without cruise control
t  000
Control unit maps
t  AG
t  SG
Automatic gearbox
Manual gearbox
t  0..
Data level (software version) of control unit
t  Coding 02002
Example: coding of engine control unit
t  WSC 12345
Dealership code of fault reader -V.A.G 1551- with which the last coding was performed

If the coding does not correspond to the equipment in the vehicle:
–  Check control unit code → Chapter, coding engine control unit.
Selecting diagnostic function:
At this point all diagnostic functions are available.
   
–  Select desired function on display.
–  Refer to repair operations for further procedure.
  Note
In the functions Basic setting and Reading measured value block, the display zones are shown from top to bottom.
  A87-0314

Interrogating and erasing fault memory > < Features of self-diagnosis