Scan Tool Connecting and Initial Checks

A 16-pin Data Link Connector (DLC) is used for access to the vehicles On Board Diagnostic (OBD) systems using the VAG 1551 Scan Tool (ST).

REQUIREMENTS
- Battery Positive Voltage (B+) OK.
- Fuse no. 22 (S22) OK.
- Ground (GND) connections for engine and transmission which are located on the upper intake manifold support to lower part of intake manifold, are OK.




VAG 1551 CONNECTING
For access to the Data Link Connector:

- Remove front ashtray.
- Slide small cover to the left (arrow).
- With ignition switched off, connect VAG 1551/3 adapter harness between Data Link Connector and VAG 1551 Scan Tool.

^ Indicated on display:

VAG - ON BOARD DIAGNOSTICS HELP
1 Rapid data transfer
2 Blink Code Output

NOTE:
- Operating modes 1 and 2 are displayed alternately.




SELECTABLE FUNCTION TABLE

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

NOTE:
- Additional operating instructions can be printed out by pressing the HELP button on the VAG 1551 Scan Tool.

- The --> button advances the Scan Tool program sequence.

- Operate VAG 1551 Scan Tool according to information and instructions on the display.
- Press button -1- for "Rapid data transfer" operating mode.

^ Indicated on display:

Rapid data transfer HELP
Insert address word XX

- Press buttons -0- and -1- (01 enters the address word for the vehicle system to be tested, "Engine Electronics").

^ Indicated on display:

Rapid data transfer Q
01 - Engine electronics

- Press Q button to confirm input.
- Motronic Engine Control Module (ECM) identification will be displayed.

037 906 258 T MOTOR
Coding 1

Example:
^ 037 906 258 T = Part No. of Motronic Engine Control Module.
^ Coding 1 = Coding version.

NOTE:
- Correct Motronic Engine Control Module number and coding are displayed only with the engine running at idle speed (Closed Throttle Position).

- ECM Coding varies according to application. For the latest information, contact the Parts Department.

Coding:
3 - With Manual Transmission.
4 - With Automatic Transmission.

- If "Control Module does not answer" appears in the display, the possible cause of the malfunction can be printed out by pressing the HELP button.
- After repairing the possible causes of the malfunction, press the -0- and -1- to again enter address word 01 for Engine Electronics.
- Press the -Q- button to confirm input.
- Press the --> button.

^ Indicated on display:

Rapid data transfer HELP
Select function XX