S4 Quattro Sedan V6-2.7L Turbo (APB) (2000)
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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.
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Leave ignition switched on for 10 seconds. Then check DTC memory of the control module that has just been connected, using the scan tool.
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If the malfunction "Data Bus Powertrain Malfunction" is now indicated, replace the control module which has just been connected.
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If malfunction "Data Bus Powertrain Malfunction" is not indicated, connect next control module, and repeat above procedure.
