ECM Identification, Connecting VAG 1551/1552 Scan Tool

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

- VAG 1551 Scan Tool


NOTE: The VAG 1552 can be used instead of the VAG 1551 Scan Tool; however a print-out is not possible.







- VAG 1551/3A Cable






Requirements:
- Fuses 10, 28, 29, 32, 34 and 43 must be OK.
- ALL electrical consumers switched OFF.
- A/C switched OFF (if installed)
- Automatic Transmission Range selector in "P" or "N" position
- Battery Voltage must be 11.5 Volts minimum
- Ground connection between engine (on transmission bell housing) and body (below battery) OK.






Work sequence:
- Connect VAG 1551/1552 Scan Tool using VAG 1551/3 adaptor cable

After Scan Tool is connected:
- Depending upon desired function:
Switch ON ignition or Start engine


NOTES:
- If display remains blank, check Voltage supply for diagnostic connection
- If due to an input malfunction "malfunction in data transfer!" is displayed, pull wire OFF Scan Tool, reconnect and repeat work step.
- Operate Scan Tool taking into account the information on the display:


Display will appear as shown


VAG - On Board Diagnostic HELP
1 - Rapid data transfer*
2 - Blink code output*


* Appears alternately

- Operate Scan Tool taking displayed information into account
- Press 1 button to select "Rapid data transfer".

Display will appear as shown


Rapid data transfer HELP
Select function XX


- Press 0 and 1 buttons to select Address word 01
"Engine electronics"

Display will appear as shown (example only)


06A906018AB Motronic M5.9.2 HS V06 ->
Coding 00000 WSC 00000


Control Module identification and coding are displayed on the VAG 1551 display as shown in example

- 06A 906 018 AB = Engine Control Module Part No. (always see parts catalog for latest version)
- Motronic = System identification
- M5.9.2 = System version
- HS = Manual transmission
AT = Automatic transmission
- V06 = Program level number
- Coding xxxxx = Control Module coding
- WSC xxxxx = Workshop code from VAG 1551, of workshop who performed last coding. (If factory coding has not been changed, WSC 00000 appears)


NOTE: Replace the Control Module if the displayed version does not correspond with vehicle.

An incorrectly coded Engine Control Module leads to:
- Engine running malfunctions (shift jerks, load change, etc.)
- Increased fuel consumption
- Increased exhaust gas emissions
- Malfunctions stored in DTC memory that do not really exist.
- Certain functions will not be performed (Oxygen sensor regulation, activation of the Evaporative emissions system).
- Reduced transmission life

If coding differs from vehicle version
- Check Control Module coding
- Press -> button.

Display will appear as shown (example only)


06A906018AB Motronic M5.9.2 HS V06 ->
Coding 00000 WSC 00000