ECU - Electronic Control Unit

In terminology of VW-group it's any electronic device, which has been carried out some logic function. Sometimes it looks like nonsens - even simple relay can be called ECU.

The coding of Electronic Control Unit used for explain the ECU where it is and what "neighbours" does it have. Very often on modern cars the coding is crossed with adaptation.

Adaptation of the Electronic Control Unit serves to explain to the ECU with whom and how to talk (If we have started to speak allegories) and serves as storehouse of various adjustable parameters. ( part of memory in the Control Unit which can be changed via internal software )

Measured Values Blocks ( MWB ) – various parameters being inbound or calculated. Considering to value of MWB Electronic Control Unit, trying to "control"... Using of MWB allows you ( if you know the basic parameters ) to find out "close to boundary" or temporarily arising ( intermittent, sporadic ) malfunctions and many other useful things at competent use.


Coding table

Automatic gearbox control unit 09E in

Audi A8 USA 2004


KGeneral note

In coding of the automatic gearbox control unit -J217 a distinction is made between

I Steering wheels without Tiptronic buttons and without paddles

I Steering wheels with Tiptronic buttons

I Steering wheels with shift paddles

For details of the classification of steering wheel with Tiptronic buttons and with shift paddles refer to the Fitting Location documents in test program J217 - automatic gearbox control unit, coding (Repair Group 38)



From model year 2004


Coding value 00002

Applicable to all vehicles with

I automatic gearbox 09E and

I steering wheels without Tiptronic buttons or steering wheels with shift paddles.

In vehicles fitted with a steering wheel with shift paddles, the function can be disabled.

In selector lever position D the steering wheel paddles can be used to switch briefly to manual shift mode (Tiptronic mode), i.e. press the '+' button to shift up and '-' to shift down.

To disable this function the automatic gearbox control unit -J217 is coded with the value 01002.

KNote The factory coding is: 00002


Coding value 01002         

Applicable to vehicles with

I automatic gearbox 09E and

I steering wheels with Tiptronic buttons.


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