TT L4-1.8L Turbo (BEA) (2004)
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Disconnect control modules connected across bus wires and check for a short circuit between bus wires.
If you cannot determine a cause for the DTC "Powertrain databus malfunction," check whether DTC is caused by one of control module
Test requirements:
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Vehicle diagnosis, measurement and information system VAS 5051 connected and vehicle self-diagnosis selected . See: Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Manufacturer's Scan Tool/Connecting VAS 5051/VAG
1551 Scan Tool (ST)
All control modules that use CAN-bus are still disconnected.
Switch ignition off.
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Connect one of control modules.
Connect VAG 1551.
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Switch ignition on.
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Press appropriate vehicle system in selection -1-.
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Check DTC memory of control module you just connected and erase it.
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Press <- button.
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Press diagnostic function "06 - End Output" in selection -1-.
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Switch ignition off and on again.
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Leave ignition switched on for 10 seconds. Then read DTC memory of control module you just connected using Scan Tool (ST).
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If DTC "Powertrain CAN-bus malfunction" is displayed, replace control module you just connected.
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If DTC "Powertrain CAN-bus malfunction" is not displayed, connect next control module and repeat procedure.