Connecting and Operating VAG 1551 Scan Tool

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. 21 (S21) or 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.

DLC Location:

VAG 1551 CONNECTION
For access to the Data Link Connector:

- Open front ashtray and remove if necessary.
- 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 DIAGNOSTIC 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.

021906258BM ENGINE
Coding 3.

Example:
^ 021 906 258 BM = 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.