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

A3 Mk1

TDI Injection and Glow Plug System (4-cyl.) 08.99 >
Self-diagnosis
Connecting vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions
 
A01-0058

Test conditions

  • ● Battery voltage at least 11 V
  • ● Fuse OK.
  • ‒ Unclip cover for diagnostic connections.
  • ‒ → Connect vehicle diagnostic, testing and information system VAS 5051 with diagnostic wire VAS 5051/1. Alternatively, connect fault reader V.A.G 1551 with diagnostic cable V.A.G 1551/3A.
Important
  • ◆ When driving the vehicle for measurement and test purposes, always secure the vehicle diagnostic, testing and information system VAS 1551 or fault reader V.A.G 1551 to the rear seat and operate it from there.

Note:

The following describes self-diagnosis using the fault reader V.A.G 1551 only.

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

*Displays appear alternately

Note:

If the display remains blank:

=> Fault reader operating instructions

Depending on the function required:

  • ‒ Switch on ignition
  • or
  • start engine , "Selectable functions" table.
  • ‒ Switch on printer using the Print key
    (Warning lamp in switch illuminates).
  • ‒ 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 press the Q key to confirm entry.
Rapid data transfer     Q
01 - Engine electronics
 
→ If the display shows one of the messages, run through the fault finding procedure as described in the diagnosis management fault finding program.
Rapid data transfer     HELP
No reply from control unit
 
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
Rapid data transfer     HELP
Communication problem
 
Rapid data transfer     HELP
K wire not switching to earth
 
Rapid data transfer     HELP
K wire not switched to positive
 
→ The display on fault reader V.A.G 1551 shows the control unit identification code e.g.:
038906018.. 1.9l    R4    EDC    G00SG    0203 ⇒
Code 00002    WSC 12345

- 038906018..

Control unit number (see also spare parts list)

- 1.9l

Engine capacity

- R4

In-line engine, 4-cylinder

- EDC

Electronic Diesel Control

- G or no display

Vehicle with or without cruise control

- 00

Control unit maps

- AG
- MG

Automatic gearbox
Manual gearbox

- 0203

Control unit data level (software version)

- Code 00002

Coding of control unit

- WSC 12345

Workshop Code from 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