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.




SELECTABLE FUNCTION TABLE




VAG 1551 CONNECTION
- Unclip cover for Data Link Connector:
- Connect VAG 1551/3 adapter harness between Data Link Connector and VAG 1551 Scan Tool.
- Depending on which function is required; either switch ignition ON, or start engine and let idle.
- Operate VAG 1551 Scan Tool according to information and instructions on the display.
- Press button -1- for "Rapid data transfer" operating mode.
- Press buttons -0- and -1- and confirm with -Q- (01 enters the address word for the vehicle system to be tested, "Engine Electronics").
- Motronic Engine Control Module (ECM) identification will be displayed.

021906258BS ENGINE -->
Coding 3.

Example:
^ 021906258BS = Part No. of Motronic Engine Control Module.
^ Coding 3 = Coding version.

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

Coding:
1 - Manual transmission without Exhaust Gas Recirculation (EGR).
2 - Automatic transmission without EGR.
3 - Manual transmission with EGR.
4 - Automatic transmission with EGR.

- Press --> button.

^ Indicated on display:

Rapid data transfer HELP
Select function XX.

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.