A6 V6-3.0L (AVK) (2004)
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Information Bus: Component Tests and General Diagnostics
With Manufacturer's Scan Tool
Data Exchange Between Engine Control Module And Other CAN-control Modules, Checking
NOTE:
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Data is exchanged between individual control modules by means of a bus system.
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"CAN bus" is used to describe a system that transports and distributes data.
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The wires between the control modules that are used to transfer the data are known as signal wires.
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Data is transmitted via signal wires in sequence, i.e. in a specific order to the connected control modules (e.g. engine rpm and accelerator pedal
position).
Checking the bus system
The Diagnostic Trouble Code (DTC) table instructed you to check the data exchange between the engine control module and CAN- compatible control
modules.
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Connect testing and information system VAS5051 and select vehicle system "01 - Engine electronics". Ignition must be switched on. See: Testing
and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With Manufacturer's Scan Tool/Scan Tool Connecting and Initial
Checks/Connecting VAS 5051 Scan Tool
Display on VAS5051:
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Under -1- select diagnostic function "08 - Read measured value block".
Display on VAS5051:
1 - Enter display group
NOTE: The measured value blocks 125 and 126 indicate CAN drive users.
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Enter "125" for "display group number 125" in zone -2- and confirm entry by pressing -Q- button.
Display on VAS5051:
