Vehicle Diagnostic, Testing and Information System VAS 5051 or VAG 1551 Scan Tool, connecting and selecting functions.: Requirements

WARNING: This page is about a different car, the 2004 Audi A6, 2003 Audi A6, 2002 Audi A6, 2001 Audi A6, and 2000 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.

Fuses for engine electronics OK
Fuel pump relay OK
Battery voltage at least 11 V
Ground (GND) connection for engine and transmission OK

Switch ignition off.
Connect Vehicle Diagnostic, Testing and Information System VAS 5051 with VAS 5051/1 diagnostic cable. As an alternative, connect VAG 1551 Scan Tool with VAG 1551/3B diagnostic cable.

Fig 1: Connecting VAS 5051 To Data Link Connector

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NOTE: The Data Link Connector (DLC) is located in the knee protection left front.

WARNING:

When performing a road test and checks, the Vehicle Diagnostic, Testing and Information System VAS 5051 as well as the VAG 1551 may be secured only on rear seat, from where it is to be operated by a second technician.
Please follow safety precautions. See SAFETY PRECAUTIONS .

NOTE: Only the procedure for OBD with VAG 1551 is described below. For details of how to use the Vehicle Diagnostic, Testing and Information System VAS 5051, please refer to its operating manual.

Indicated on display

Fig 2: VAG 1551 Scan Tool Display - Connecting And Selecting Functions (1 Of 8)

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* Appears alternately

If no display appears, check diagnostic cables:

See appropriate System Wiring Diagrams article.

Depending on the function required:

Switch ignition on.

Start engine. See AVAILABLE FUNCTIONS .

Switch on printer with Print button (indicator light in button lights up).
Press button -1- to select "Rapid data transfer" operating mode.

Indicated on display

Fig 3: VAG 1551 Scan Tool Display - Connecting And Selecting Functions (2 Of 8)

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Press buttons -0- and -1- to insert "Engine electronics" address word 01.

Fig 4: VAG 1551 Scan Tool Display - Connecting And Selecting Functions (3 Of 8)
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Press -Q- button to confirm input.

NOTE: If the display shows one of the messages reproduced here, run through the troubleshooting procedure as described in the "Electrical Wiring Diagrams, Troubleshooting and Component Locations".

Fig 5: VAG 1551 Scan Tool Display - Connecting And Selecting Functions (4 Of 8)

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Fig 6: VAG 1551 Scan Tool Display - Connecting And Selecting Functions (5 Of 8)

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Fig 7: VAG 1551 Scan Tool Display - Connecting And Selecting Functions (6 Of 8)

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The display on VAG 1551 will show the control module identification. For example, see Fig 8 and CONTROL MODULE IDENTIFICATION (EXAMPLE) .

Fig 8: VAG 1551 Scan Tool Display - Connecting And Selecting Functions (7 Of 8)

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CONTROL MODULE IDENTIFICATION (EXAMPLE)

4D0907558...	Engine Control Module (ECM) Part No.
4.2 L	Engine displacement
V8 / 5V	Engine configuration (V8 5-valve)
G	"G" for vehicles with Cruise control system
D...	ECM Software version See CONTROL MODULE, CODING .
Coding 06752	Coding of ECM See CONTROL MODULE, CODING .
WSC 06388	Dealership code of VAG 1551 with which the last coding was performed

NOTE:

Incorrect coding may lead to higher emissions and increased strain on the automatic transmission.
Incorrect coding also causes non-existent malfunctions to be stored in the DTC memory.

If the coding differs from the vehicle version, then:

Check coding of engine control module. See CONTROL MODULE, CODING .
Press --> button.

Indicated on display:

Fig 9: VAG 1551 Scan Tool Display - Connecting And Selecting Functions (8 Of 8)

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NOTE: After pressing the HELP button, an overview of the possible functions is printed out.