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Interrogating and erasing fault memory > < Significance of the warning lamp for self-diagnosis (exhaust gas warning lamp); For vehicles which conform to emission standard

A4 Mk1

Motronic Fuel Injection and Ignition System (6-cyl. Turbo)
Self-diagnosis for the Motronic system
Connecting vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions

Test requirements:

  • ● Battery voltage at least 11 V.
  • ● Earth connections on engine and gearbox OK.

Procedure
 
A24-0028
  • ‒ → Open rear ashtray and remove cover for diagnostic connector.
 
A01-0061
  • ‒ → Connect up vehicle diagnostic, testing and information system VAS 5051 with diagnostic wire VAS 5051/1. Alternatively, connect fault reader V.A.G 1551 with diagnostic wire 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.
  • ◆ Observe the safety precautions

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

  • ‒ If no display appears, check diagnostic wires:

=> "Current Flow Diagrams, Electrical Fault-finding and Fitting Locations" binder; Fault-finding program "Diagnostic wiring"

Depending on the function required:

  • ‒ Switch the ignition on.
  • or
  • start engine => Page 01-7, "Selectable functions" table.
  • ‒ Switch on printer using the Print key
    (Warning lamp in key 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 press the Q key to confirm entry.
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 Program for diagnostic wiring.
Rapid data transfer     HELP
No reply from control unit
 
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
Rapid data transfer     HELP
Communication problem
 
Rapid data transfer     HELP
K-wire not switching to earth
 
Rapid data transfer     HELP
K-wire not switching to positive

Control unit identification (example)
 
→ The display on fault reader V.A.G 1551 shows the control unit identification code e.g.:
8D0907551.. 2.7l    V6/5VT    G    0002    ⇒
Code 10711    WSC 06388

- 8D0907551..

Control unit number (see also spare parts program)

- 2.7l

Engine capacity

- V6/5VT

Engine type (V engine, 6-cylinder, 5-valve, turbo1))

- "G" or no display

Vehicle with or without cruise control

- 0002

Control unit software version

- Code 10711

Engine control unit code

- WSC 06388

Workshop Code from V.A.G 1551 which was used to perform the last coding

1)This engine is a "biturbo" engine, i.e. two turbochargers are installed in the engine. "Bi" (Latin) signifies two or double.

If the coding differs from the vehicle version, then:

  • ‒ Check control unit coding => Page 01-89.
    Encoding engine control unit
  • ‒ Press the ⇒key.
 
→ Display readout (relevant chassis number):
xxxxxxxxxxxxxxxxx    yyyyyyyyyyyyyy
  • ◆ xxxxxxxxxxxxxxxxx: 17-digit vehicle identification number (chassis number)
  • ◆ yyyyyyyyyyyyyy: 14-digit identification number for immobiliser control unit

Note:

The additional readout (vehicle and immobiliser identification number) is only displayed if the vehicle is fitted with what is known as "Immobiliser III".

  • ‒ Press the ⇒key.
 
→ Display:
Rapid data transfer     HELP
Select function XX

Note:

Press HELP key to obtain a printout of available functions.

Interrogating and erasing fault memory > < Significance of the warning lamp for self-diagnosis (exhaust gas warning lamp); For vehicles which conform to emission standard