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- -> Disconnect control units linked by bus wires and examine bus wires for mutual short circuit.
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
- -> Examine bus wires for short to positive/earth.
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
If cause of "Drive train data bus defective" fault, for example, is not found in bus wires, check whether one of
the control units is responsible for the problem.
Test requirement:
• Vehicle diagnostic, testing and information system VAS 5051 connected up and vehicle self-diagnosis se‐
lected => Page 1
All control units using CAN bus for communication still disconnected; ignition off.
- Connect one of the control units.
Audi A3 1997 ➤
Electrical system Self-diagnosis - Edition 02.2002
112 01 - Self-diagnosis
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