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Interrogating and erasing fault memory > < Technical data of self-diagnosis

A4 Mk1

TDI diesel injection and glow plug system (4-cyl.) 08.99 ä
Self-diagnosis
Connecting vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions
 
A01-0061

Test conditions

  • ● Battery voltage at least 11 V
  • ● Fuse OK.
  • ‒ → Open rear ashtray (in centre console) and remove cover for diagnostic connector.
  • ‒ → Connect up vehicle diagnostic, testing and information system VAS 5051 with diagnostic cable VAS 5051/1. Alternatively, connect fault reader V.A.G 1551 using diagnostic cable V.A.G 1551/3A.
Warning:
  • ◆ When carrying out road tests using vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G

Note:

The following description only covers the procedure for performing self-diagnosis with fault reader V.A.G 1551.

If using vehicle diagnostic, testing and information system VAS 5051, follow the operating instructions supplied with the equipment.
 
→ Indicated on display:
V.A.G - SELF DIAGNOSIS    HELP
    1 - Rapid data transfer*
    2 - Flash code output*

* Appears alternately

Note:

If the display remains blank:

=> Fault reader operating instructions

Depending on the function required:

  • ‒ Switch on ignition
  • or
  • Start engine , Table "Selectable functions".
  • ‒ Switch on printer with the Print button
    (Warning lamp in button lights up).
  • ‒ Press key 1 for "Rapid data transfer".
 
→ Indicated on display:
Rapid data transfer    HELP
Enter address word XX

 
→ Press keys 0 and 1 for address word "Engine electronics" and confirm entry by pressing the Q key.
Rapid data transfer    Q
01 - Engine electronics
 
→ If the display shows one of the messages reproduced here, run through the fault-finding procedure as described in the Fault-Finding Programme for diagnosis wiring.
Rapid data transfer    HELP
Control unit does not answer
 
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
Rapid data transfer    HELP
Fault in communication build up
 
Rapid data transfer    HELP
K wire not switching to earth
 
Rapid data transfer    HELP
K wire not switching to positive
 
→ The display on fault reader V.A.G 1551 will show the control unit identification. For example:
038906018..    1.9l    R4    EDC    G00SG    0203 " Coding 00002    WSC 12345

- 038906018..

Control unit number (see also Parts List)

- 1.9 ltr.

Engine capacity

- R4

In-line engine, 4 cylinders

- EDC

Electronic Diesel Control

- G
- or no display

Vehicle with or without cruise control

- 00

Control unit maps

- AG
- SG

Automatic gearbox
Manual gearbox

- 0203

Software version of control unit

- Coding 00002

Control unit coding

- WSC 12345

Workshop Code of V.A.G 1551 which was used to perform the last coding
  • ‒ Press ⇒key.
 
→ Indicated on display:
Rapid data transfer    HELP
Select function XX

Interrogating and erasing fault memory > < Technical data of self-diagnosis