Connecting VAG 1551 Scan Tool (ST), Connecting and Selecting Engine Control Module

VAG 1551 Scan Tool (ST), Connecting And Selecting Engine Control Module

Special tools and equipment







- VAG 1551 Scan Tool

NOTE:
- The VAG 1552 can be used instead of the scan tool VAG 1551, however a print-out is not possible.
- All functions of VAG 1551/1552 can also be carried out with the new tester VAS 5051. Connecting VAS 5051.







- VAG 1551/3 Cable

Test conditions
- Fuse 21 OK.
- The battery voltage must be at least 11.5 V.
- Ground connection between engine and body must be OK.

Work sequence







- Remove ashtray and slide cover for Data Link Connector (DLC) to left -arrow-.
- Connect VAG 1551 Scan Tool with cable VAG 1551/3.

After the scan tool has been connected:
- Depending upon desired function:
Switch ignition on or Start engine, Table "Selectable functions". Selectable Functions When Using VAG1551/1552 or VAS 5051

NOTE:
- If the display remains blank, check voltage supply for diagnostic connection:
- If the display does not indicate as described in the work sequence:
- If due to an input fault "Error in communication link!" is displayed, disconnect wire from scan tool, reconnect and repeat work step.
- Operate scan tool taking into account information on display:

Indicated on display

V.A.G - ON BOARD DIAGNOSTIC HELP
1 - Rapid data transfer*
2 - Blink code output*

- Appears alternately

- Operate scan tool taking into account information on display.
- Press key 1 for "Rapid data transfer".
- Press keys 0 and 1 for address word "Engine electronics" and confirm entry with Q key.

On the display the control module identification and coding are displayed, e.g.:

037906018A 2.0l R4/2V MOTR HS V04 ->
Coding XXXXX WSC XXXXX

- 037 906 018 A Part No. of the control module (for latest control module version)
- 2.0 ltr. Engine displacement
- R4/2V Engine configuration (4-Cyl. in-line engine, 2-valve)
- MOTR = System designation (Motronic)
- HS = Manual transmission AT = Automatic transmission
- V04 = Program level number
- Coding xxxxx = Control module coding, coding variants of engine control module. Programming Control Module (ECM) -J248-, (Function 07)
- WSC xxxxx = Dealership code from VAG 1551, of the workshop who carried out the last coding. (If the factory coding has not been changed, WSC 00000 appears)

NOTE: Replace control module if the control version displayed does not correspond to the vehicle.

An incorrectly coded engine control module leads to:
- Engine running problems (gear change jerks, load change jerks, etc.)
- Increased fuel consumption
- Increased exhaust gas emissions
- Malfunctions stored in DTC memory which are not actually present
- Functions will not be performed (Oxygen sensor control, activation of the EVAP system, etc.).
- Reduced transmission life

If the coding differs from the vehicle version, then:
- Checking control module coding, coding engine control module. Programming Control Module (ECM) -J248-, (Function 07)
- Press -> key.

Indicated on display:

Rapid data transfer HELP
Select function XX