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.


Wiring and component check using test box VAG 1598/22 or VAG. 1598/42+1598/48


Contact numbers of connector match socket numbers of test box.


If no test box is available, only matching adapter leads from adapter set V.A.G 1594 may be used for measuring. Any other test leads or probes would damage the contacts in the connector!

Pin assignment, 80-pin connector:

I Contacts not listed are unassigned

1- Earth term.31 (engine earth connection)

2- Earth term.31 (gearbox earth connection)

27- Battery term.30

28 - Terminal 15 (battery switched)

29- Activation, gear selection valve 1 -N284

31- On/off switch, hydraulic pump relay -J510

32- Activation, gear selection valve 2 -N285

33 - Drive train CAN bus Low

34- Primary coil (+) clutch position sender -G476

35- Secondary coil (+) clutch position sender -G476

38- (-) Gearbox input speed sender -G182

39- Signal, gear recognition sensor 1 -G604

40- Signal, gearbox hydraulic pressure sender -G270

42- Starter inhibitor switch (P/N)

43- Activation wire, clutch actuator valve -N255

44- Activation, gear selection valve 3 -N286

45 - Drive train CAN bus High

46- Primary coil (-) clutch position sender -G476

47- Secondary coil (-) clutch position sender -G476

48- Engine speed (12V pulses)

49- Diagnostic wire

50- (+) Gearbox input speed sender -G182

51- Signal, gear recognition sensor 2 -G616

66- Earth for sensors G604, G616 and G270

69 - Brake light switch term.54

73- Operating voltage for sensors G404 and G616

76- Signal, engine start term.50

78- Wake-up signal by opening driver's door

79- Operating voltage for hydraulic pressure sender -G270


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