Audi Workshop Service and Repair Manuals > A4 Mk1 > Power unit | Motronic Fuel Injection and Ignition System (4-cyl) Turbo | Self diagnosis, V.A.G Inspection Service | Self-diagnosis for the Motronic system | Connecting vehicle diagnosis, measurement and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions

Interrogating and erasing fault memory > < Safety precautions

Motronic Fuel Injection and Ignition System (4-cyl) Turbo

Self-diagnosis for the Motronic system

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

Test requirements:

● Fuses for engine electronics OK.

=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations

● Fuel pump relay OK; checking .
● Battery voltage at least 12.7 V.
● Earth connections on engine and gearbox OK.

Procedure



‒ → 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 with diagnostic cable V.A.G 1551/3A.

Important:
Pay attention to 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 1)

2 - Flash code output 1)

1) Appears alternately

Note:

If the display remains blank:

‒ Perform fault-finding in line with "Diagnostic wire fault finding instructions".

=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations

Depending on required function => "Available functions" table, Page 01-8.

‒ Switch the ignition on.

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

→ When indicated on display:

Rapid data transfer HELP

Enter address word XX

Note:

Address word 00 is used to start the automatic test sequence i.e. interrogation of fault memories in all vehicle systems with self-diagnosis capability in vehicle with rapid data transfer.

‒ Enter "01" for address word "Engine electronics" and confirm entry with Q key.

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

4B0906018R 1.8litres R4/5VT G 0002 ⇒

Coding 11501 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)

- 4B0906018R	Part-No.; assignment => Parts List
- 1.8l	Engine capacity
- R4/5VT	In line engine, 4 cylinders, 5 valves, turbo
- "G" or no display	Vehicle with or without cruise control
- 0002	Control unit software version
- Code 11501	Control unit code
- WSC 12345	Workshop Code of V.A.G 1551 with which encoding was last performed

‒ Press the ⇒key.

→ Indicated on display (function selection):

Rapid data transfer HELP

Select function XX

Notes:

◆ The control unit identification can be displayed again by entering function "01" for "Interrogating control unit version" and confirming with the Q key.

→ When adjacent display appears:

Rapid data transfer HELP

No reply from control unit

‒ Perform fault-finding in line with "Diagnostic wire fault finding instructions".

=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations

Rapid data transfer HELP

K-wire not switching to earth

Rapid data transfer HELP

K-wire not switched to positive

Rapid data transfer HELP

Communication problem

Available functions

Vehicle diagnostic, measurement and information system VAS 5051 orfault reader V.A.G 1551		Ignition on, engine stopped	Engine idling	Vehicle running	Page
Address words
01	Engine electronics	yes	yes	yes	01-3
00	Automatic test sequence	yes	yes	yes	01-5
Functions
01	Check control unit version	yes	yes	yes	01-7
02	Interrogating fault memory	no	yes	yes	01-9
03	Final control diagnosis	yes	no	no	01-46
04	Basic setting	yes	yes	yes	01-54
05	Erasing fault memory	yes	yes	yes	01-9
06	End of output	yes	yes	yes	01-11
07	Encoding control unit	yes	no	no	01-59
08	Reading measured value block	yes	yes	yes	01-61

Power unit
Motronic Fuel Injection and Ignition System (4-cyl) Turbo / Self diagnosis, V.A.G Inspection Service / Self-diagnosis for the Motronic system
Connecting vehicle diagnosis, measurement 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 Fuel Injection and Ignition System (4-cyl) Turbo / Self diagnosis, V.A.G Inspection Service / Self-diagnosis for the Motronic system Connecting vehicle diagnosis, measurement and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions

Power unit Motronic Fuel Injection and Ignition System (4-cyl) Turbo / Self diagnosis, V.A.G Inspection Service / Self-diagnosis for the Motronic system Connecting vehicle diagnosis, measurement and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions

Power unit
Motronic Fuel Injection and Ignition System (4-cyl) Turbo / Self diagnosis, V.A.G Inspection Service / Self-diagnosis for the Motronic system
Connecting vehicle diagnosis, measurement and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions

Power unit
Motronic Fuel Injection and Ignition System (4-cyl) Turbo / Self diagnosis, V.A.G Inspection Service / Self-diagnosis for the Motronic system
Connecting vehicle diagnosis, measurement and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions