Audi Workshop Service and Repair Manuals > A4 Mk1 > Power unit | Motronic injection and ignition system (4-cyl. turbo) | Self diagnosis, V.A.G Inspection Service | Self-diagnosis of Motronic system | Connecting vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions

Interrogating and erasing fault memory > < Safety precautions

Motronic injection and ignition system (4-cyl. turbo)

Self-diagnosis of Motronic system

Connecting vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions

Requirements for test:

● Battery voltage not less than 11 V
● Earth connections on engine and gearbox OK

Work sequence

‒ → Open rear ashtray 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

Observe safety precautions .

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 in display

V.A.G - SELF DIAGNOSIS HELP

1 - Rapid data transfer 1)

2 - Flash code output 1)

1) appears alternately

Note:

If the display remains blank:

=> Fault reader operating instructions

Depending on the function required, see table of selectable functions => Page 01-8.

‒ Switch on ignition.

‒ Start the engine.
‒ Switch on fault reader printer with the print key. The warning lamp in key must light up.
‒ Press key 1 for "Rapid data transfer".

→ When this display appears:

Rapid data transfer HELP

Enter address word XX

Note:

Address word 00 is used to start the automatic test sequence (i.e. fault memory interrogation for all vehicle systems with self-diagnosis capability in "Rapid data transfer" mode).

‒ Press keys 0 and 1 for address word "Engine electronics" and confirm entry with Q key.

→ The display on fault reader V.A.G 1551 will show the control unit identification. For example:

4B0906018K 1.8l R4/5VT G 0002 ⇒

Coding 05701 WSC 12345

Note:

The control unit identification can be printed out by pressing the PRINT key on fault reader V.A.G 1551.

Control unit identification (example)

- 4B0906018K	Part No. => Parts list
- 1.8 ltr.	Engine capacity
- R4/5VT	In-line engine, 4 cylinders, 5 valves per cylinder, turbo
- "G" - or no display	With cruise control (G) or without cruise control
- 0002	Status of data (software version) in control unit
- Coding 05701	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 (function selection):

Rapid data transfer HELP

Select function XX

Notes:

◆ By entering "01" ("Interrogate control unit version") and confirming with the Q key, the control unit identification can be displayed again.

→ Indicated on display:

Rapid data transfer HELP

Control unit does not answer

‒ Perform fault-finding procedure as described in "Fault-finding programme: diagnostic wiring".

=> 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

Rapid data transfer HELP

Fault in communication build-up

Selectable functions

Vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551		Ignition on, engine not running	Engine idling	Vehicle being driven	Page
Address words
01	Engine electronics	Yes	Yes	Yes	01-3
00	Automatic test sequence	Yes	Yes	Yes	01-5
Functions
01	Interrogate control unit version	Yes	Yes	Yes	01-7
02	Interrogate fault memory	No	Yes	Yes	01-9
03	Final control diagnosis	Yes	No	No	01-37
04	Basic setting	Yes	Yes	Yes	01-44
05	Erase fault memory	Yes	Yes	Yes	01-9
06	End output	Yes	Yes	Yes	01-11
07	Code control unit	Yes	No	No	01-48
08	Read measured value block	Yes	Yes	Yes	01-51

Power unit
Motronic injection and ignition system (4-cyl. turbo) / Self diagnosis, V.A.G Inspection Service / Self-diagnosis of Motronic system
Connecting vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions

Interrogating and erasing fault memory > < Safety precautions

Audi Workshop Service and Repair Manuals

A4 Mk1

Power unit Motronic injection and ignition system (4-cyl. turbo) / Self diagnosis, V.A.G Inspection Service / Self-diagnosis of Motronic system Connecting vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions

Power unit Motronic injection and ignition system (4-cyl. turbo) / Self diagnosis, V.A.G Inspection Service / Self-diagnosis of Motronic system Connecting vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions

Power unit
Motronic injection and ignition system (4-cyl. turbo) / Self diagnosis, V.A.G Inspection Service / Self-diagnosis of Motronic system
Connecting vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions

Power unit
Motronic injection and ignition system (4-cyl. turbo) / Self diagnosis, V.A.G Inspection Service / Self-diagnosis of Motronic system
Connecting vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions