A6 Quattro Sedan V6-2.7L Turbo (APB) (2000)
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Disconnect control modules that are linked by bus wires and check whether there is an open circuit in one of the bus wires
Locations
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If no malfunction can be identified in the bus wires replace control module 2.
Example 3
From the malfunctions present in the DTC memories, you can see that none of the control modules are able to transmit or receive signals.
Control
Stored malfunctions
module
in DTC memory:
1
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Data Bus Powertrain Malfunction
2
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Data Bus Powertrain Malfunction
3
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Data Bus Powertrain Malfunction
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Switch ignition off.
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Disconnect the control modules which are linked by the bus wires and check for a short circuit between the bus wires
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Check bus wires for short to B+ and short to Ground (GND)
If the cause of the malfunction "Data Bus Powertrain Malfunction" cannot be found in the data bus wires, check whether one of the control
modules is causing the malfunction.
At this stage all the control modules which communicate via the CAN data bus are disconnected. The ignition is switched off.
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Connect one of the control modules.
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Connect VAG1551 scan tool. Switch ignition on and erase the DTC memory of the control module which has just been connected. End output
from scan tool with function 06 "End Output."
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Switch ignition off and then on again.