Scan Tool Connecting and Initial Checks

VAG 1551 Scan Tool, Connecting and Selecting Engine Electronics Control Module

Special tools and equipment







- VAG 1551 scan tool







- VAG 1551/3 adapter cable


NOTE: The vehicle system tester VAG 1552 may be used instead of the VAG 1551 scan tool, however a printout is not possible.


Requirements
- Fuses 15,18,19 and 21 K
- Battery voltage 11 Volts minimum
- Engine/transmission ground connections OK

Work sequence







- Remove Data Link Connector (DLC) cover to expose DLC (on right side of steering column next to instrument cluster).
- Connect VAG 1551 Scan Tool using VAG 1551/3 adapter cable.

After Scan Tool has been connected and depending upon which function is required:
- Switch ignition on or start engine (depending upon which function is required).

If the display: "fault in data transfer" appears:
- Disconnect Scan Tool from DLC and then reconnect, repeat work step.

Appears on display

VAG-On Board Diagnostic HELP
1 - Rapid data transfer
2 - Blink code output*


* Text lines 1 and 2 of display appear alternately
- Operate Scan Tool taking into account any displayed info.
- Press button -1- to select "Rapid data transfer" mode.
- Press buttons -0- and -1- to select "Engine electronics" address word 01 and press -Q- button to enter input.

VAG 1551 Scan Tool display shows Control Module identifying information, for example:

021 906 259B MOTRONIC M5.9 AT V0 1 ->
Coding 00001 WSC xxxxx

- 021 906 259B = Control Module Part Number


CAUTION!
Part numbers are for reference only. Always check with the Parts department for the latest information.


- MOTRONIC M5.9 = Fuel injection and Ignition system
- Coding 00001 = Coding variants
- WSC = Workshop code

Coding variations
Coding For following combinations:
00000 VR6 with manual transmission
00001 VR6 with automatic transmission


NOTE: Accurate control module coding and identifying information is only possible when the engine is idling.


The ignition must be switched OFF once before control module coding is entered into the ECM and made viewable via the scan tool display. Incorrect coding can lead to:
- Engine running malfunctions
- Increased fuel consumption
- Increased emission levels
- Stored DTCs that did not actually occur
- Reduced transmission life

If coding differs from vehicle version:
- Check control module coding Engine Control Module (ECM), Coding
- Press -> button.

Display will appear as shown


Rapid data transfer HELP
Select Function XX


For additional steps See repair procedures.