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Fault memory > < Connecting vehicle diagnostic, testing and information system VAS 5051 and selecting engine electronics control unit

A2

MM-MPI injection and ignition system (4-cylinder)
General notes on self-diagnosis
Connecting fault reader V.A.G 1551 and selecting engine electronicscontrol unit
 
W00-0459

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

  • ◆ → V.A.G 1551 Fault reader
 
W00-0047
  • ◆ → V.A.G 1551/3 Cable

Test conditions

  • ● Fuse OK.
  • ● The battery voltage must be at least 11.5 V.
 
A24-0378
  • ● Earth connections on engine and gearbox OK.

Work sequence

  • ‒ → Connect up fault reader V.A.G 1551 using diagnostic cable V.A.G 1551/3A.
Warning:
  • ◆ When carrying out road tests using fault reader V.A.G

Note:

The following description only covers the procedure for performing self-diagnosis with fault reader V.A.G 1551.
 
→ Indicated on display:
V.A.G - SELF DIAGNOSIS    HELP
1 - Rapid data transfer*
2 - Flash code output*

* Appears alternately

  • ‒ If no display appears, check diagnostic cables:

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

Depending on the function required:

  • ‒ Switch on ignition
  • or
  • Start the engine : table of "Functions which can be selected".
  • ‒ 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, check the diagnosis wiring.
Rapid data transfer    HELP
Control unit does not answer

=> Current flow diagrams, Electrical fault finding and Fitting locations binder
 
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:
036 906 0034 Q    1.4l/R4    EPC    AG    D00 ⇒
Coding 31    WSC 12345

- ..........

Control unit number (see also Parts List)

- 1.4 ltr.

Engine capacity

- R4

In-line engine, 4 cylinders

- EPC

Electronic Power Control

- G
- or no display

Vehicle with or without cruise control

- SG
- AG

Manual gearbox
Automatic gearbox

- D00

Software version of control unit

- Coding 31

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 (chassis No. of vehicle)
WAUZ8ZZYN02126    AUZ7ZOW0801181
  • ◆ WAUZ8ZZYN00002341: 17-digit vehicle identification No. (chassis No. of vehicle)
  • ◆ AUZ7Z0X0590944: 14-digit Identification No. for immobilizer control unit
  • ‒ Press the ⇒key.
 
→ Indicated on display:
Rapid data transfer    HELP
Select function XXX
  • ‒ For further steps see repair procedures.

Fault memory > < Connecting vehicle diagnostic, testing and information system VAS 5051 and selecting engine electronics control unit