Engine Control Module (ECM) Version, Checking

VAG 1551 Scan Tool (ST), Connecting
Address Word 01 "Engine Electronics", Selecting

Special tools, testers, required:
- VAG 1551/1552 Scan Tool using VAG 1551/3 adaptor cable

NOTE: The VAG 1552 Scan Tool can be used instead of the VAG 1551, however; the VAG 1552 does not have printing capability.





Test conditions:
- Fuses 12, 28, 29, 32 and 34 OK
- Battery voltage must be 11.5 Volts minimum
- Ground connections: right engine mount and on body OK Body Ground connection





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

After Scan Tool has been connected:
- Depending upon desired Function:
Switch ON ignition
or
Start engine, See Selectable Functions/Testing Functions of On-Board Diagnostics II

NOTES:
- If display still blank, check Data Link Connector voltage supply
- If due to an input error "Fault in data transfer!" is displayed, disconnect Scan Tool, reconnect and repeat work step.

- Operate Scan Tool taking the displayed information into account

Display will appear as shown

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

* Display alternately flashes lines 1 and 2

- Operate Scan Tool taking the displayed information into account
- Press button 1 to select "Rapid data transfer" mode
- Press buttons 0 and 1 to select address word 01
"Engine electronics"
- Press Q button to enter input

ECM identification and coding will be shown on the display:

800 907 557N 1.8LR4/5VT MOTR AT D03->
Coding 06051 WSC xxxxx

- 8D0 907 557 N = ECM Part No.
(for latest ECM version see parts catalogue)
- 1.8 ltr. = Engine displacement
- R4/5VT = Engine configuration (4-Cyl. in-line engine, 5 valve)
- MOTR = System designation (Motronic)
- HS = Manual transmission, AT = Automatic transmission
- D03 = Program level number
- Coding xxxxx = ECM coding, table
- WSC xxxxx = VAG 1551 Workshop code
If factory coding has not been changed, WSC 00000 appears

NOTES: Replace ECM if displayed ECM version does not correspond to the vehicle.

An incorrectly coded Engine Control Module leads to:
- Increased levels of exhaust emissions
- Engine running malfunctions (gear shift jerking, load change jerks, etc.)
- Increased fuel consumption
- Malfunctions stored in DTC memory that have not actually occurred.
- Functions will not be performed (Oxygen sensor control EVAP system activation, etc.).
- Reduced transmission life

If the coding differs from the vehicle version
- Check ECM coding.
- Press -> button.

Display will appear as shown

Rapid data transfer HELP
Select function XX