Examples of signals into data bus (used by engine control module)
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2006 Volkswagen Golf, 2006 Volkswagen GTI, 2005 Volkswagen Jetta, 2005 Volkswagen Golf, and 2005 Volkswagen GTI. However, it is still accessible from the selected car via links, so may be relevant.
- Cruise control system
- Ignition timing influences
In addition to the engine control module, other control modules exchange information via the data bus as well, as this example shows.
If the automatic transmission control module detects that signals are missing or faulty, the data bus itself, another system or a component of another system may be faulty.
Therefore, always perform OBD of affected control modules.