Connecting the V.A.G 1551 fault reader and selecting the engine electronics control unit — AUDI
Connecting the V.A.G 1551 fault reader and selecting the engine electronics control unit on Audi: factory workshop procedure for engines AGU.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
🔧 Engine codes this applies to
📋 Procedure
Note:
The V.A.G 1552 vehicle system tester may be used instead of the V.A.G 1551 fault reader, however a printout is not possible.
Test conditions
Battery voltage at least 11 V.
Earth connections on engine and gearbox OK.
Fuel pump relay OK.
Fuses OK.
Unclip the cover for the diagnostic connection.
Connect the V.A.G 1551 fault reader or V.A.G 1552 vehicle system tester with cable V.A.G 1551/3.
V.A.G self-diagnosis
HELP
1 - Rapid data transfer*
2 - Flash code output*
Display readout:
* displayed alternately
Note:
If the display remains blank:
=> Operating instructions for the fault reader
Depending on the function required:
Switch on the ignition.
or
start the engine => Page
01-1
, Table "Selectable functions".
Switch on printer with the Print key
(the indicator lamp in the key lights up).
Press key 1 for "Rapid data transfer".
Rapid data transfer
HELP
Enter address word XX
Display readout:
Rapid data transfer
Q
01 - Engine electronics
Press keys 0 and 1 for the address word "Engine electronics" and confirm entry by pressing the Q key.
Rapid data transfer
HELP
Control unit does not answer
If the display shows one of the messages reproduced here, perform the fault finding procedure according to the fault finding program for diagnostic wiring.
=>
Rapid data transfer
HELP
Communications fault
Current Flow Diagrams, Electrical Fault Finding and Fitting Locations binder
Rapid data transfer
HELP
K wire not switching to earth
Rapid data transfer
HELP
K wire not switching to positive
06A906018.. 1.8l
R4/5VT MOTR HS
D..⇒
Encodierung 04000
WSC 06388
The control unit identification appears on the V.A.G 1551 fault reader, e.g.:
- 06A906018. · Control unit number (see also spare parts program)
- 1.8l · Engine capacity
- R4/5VT · In line engine, 4 cylinders, 5 valves, turbo
- MOTR · Motronic
- HS / AT · MG = Manual gearbox / AT = Automatic transmission
- D.. · Status (software version) of control unit
- Encoding 04000 · Control unit encoding
- WSC 06388 · Workshop Code from the V.A.G 1551 used to perform the last encoding
Press the ⇒key.
Rapid data transfer
HELP
Select function XX
Display readout:
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.