Connecting and Operating VAG 1551 Scan Tool

Requirements
- Fuse 19 in passenger side footwell OK
- Circuit breakers S72 and S75 in passenger side footwell OK.
- Fuel pump relay OK.
- Ground connections OK.

Procedure
- Switch OFF ignition

Data Link Connector Location:

- Raise vehicle hood and locate Auxiliary Relay Station I (drivers side cowl area) and the Data Link Connectors (DLC).

Connecting VAG 1551:

Connect Scan Tool VAG 1551 using adaptor cable VAG 1551/1 to DLC.
- First connect black adaptor cable connector (voltage supply) to DLC # 1. These displays appear alternately as shown:

VAG self-diagnosis HELP
1 - Rapid data transfer

OR

VAG self-diagnosis HELP
2 - Blink code output

Note: Do not connect the white adaptor cable connector if there is no display. Instead, check the voltage supply for the scan tool, Refer to Data Link Connector / Testing and Inspection. Testing and Inspection
- Connect white adaptor cable connector to DLC # 2.
- The blue connector is not used
- To obtain additional operating instructions press the HELP button.
- To step through the program sequence, press the arrow button

Selectable Functions
- Depending on which function is required; either switch ON ignition or start engine and let idle

Check Engine Control Module (ECM) Version and Coding (function 01):
- Check with engine idling.

Read Diagnostic Trouble Code (DTC) Memory (function 02):
- Check with engine idling.
Note: If engine does not start, crank engine 4 to 6 seconds and leave ignition switched ON.

Output Diagnostic Test Mode (DTM) (function 03):
- Switch ignition ON, but do not start engine.

Basic Setting (function 04):
- Let engine idle or switch ignition on.

Erase DTC Memory (function 05):
- Check with engine idling, leave ignition switched on after checking the DTC memory.

End Output (function 06):
- Engine idling or ignition on.

Read Measuring Value Block (function 08):
- Let engine run and/or switch ignition ON.

Operating Mode
- Press button 1 to select operating mode "Rapid data transfer", Display will appear as follows:

Rapid data transfer HELP
Enter address word XX

OR

- Press button 2 to select operating mode "Blink code output", Display will appear as follows:

Blink code output HELP
Activate with (arrow) key

Rapid data transfer
After selecting operating mode Rapid data transfer select diagnostic function.
- Engine Electronics 01
- Transmission Electronics 02
- Press 0 and 1 buttons to select address word 01 "Engine electronics".Display will appear as follows:

Rapid data transfer Q
01-Engine electronics

- Press Q button to enter input. The engine control module identification number is indicated via the display, for example: 4A0 906 266 A. Display will appear as follows:

4A0907551AA 2.21 R5 MOTR RHV HS D
Coding 4

- Display breakdown is as follows:
^ ECM identification: 4A0 907 551AA (example)
^ Engine displacement: 2.21 liter
^ Engine type: R = in-line; 5 = 5-cylinder
^ Fuel injection system: MOTR = Motronic Multiport Fuel Injection
^ Ignition type: RHV = resting high voltage distribution
^ Transmission type: HS = manual; AT = automatic
^ ECM software version: D or (factory use only)
^ Coding: 1 = European countries; 4 = US & Canada

Note: Only during idle speed do correct specifications regarding the engine control module number and related coding occur.
- Press (arrow) button. If display appears as follows:

Rapid data transfer HELP
ECM does not answer\

- Print out a list of possible causes by pressing the VAG 1551 HELP button
- After eliminating possible causes, reselect operating mode and address word, display appears as follows:

Rapid data transfer HELP
Select function XX

- Select function code.
- Check ECM Version and Coding 01
Programming and Relearning
- Diagnostic Trouble Code Memory 02
[1][2]Reading Diagnostic Trouble Codes
- Output Diagnostic Test Mode 03
Output Diagnostic Test Mode (DTM)
- Basic Setting 04
Basic Setting (Function 04)
- Erase DTC Memory 05
With Manufacturer's Scan Tool
- End Output 06
Ending Output (Function 06)
- Read Measuring Value Block 08
Read Measuring Value Block (Function 08)

- Press Q button to enter input and see the proper procedure article for your selection
Note: If function 02 Check DTC memory is to be selected
- Switch on the printer using the print button, lamp in print button lights
- When the printer is switched ON stored malfunctions are automatically printed out in sequence