TT Quattro Coupe L4-1.8L Turbo (BEA) (2003)
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Switch ignition off.
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Disconnect the control modules connected across the bus wires and check the bus wires for an open circuit.
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Replace control module 2 if no malfunctions can be found in the bus wires.
Example 3:
Using the DTCs stored in the memories, you have determined that none of the control modules are sending or receiving signals.
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Switch ignition off.
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Disconnect the control modules connected across the bus wires and check for short circuits between the bus wires.
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Check the bus wires for short circuit to B+ or Ground (GND).
If a cause for the malfunction can not be determined, e.g. "powertrain data-BUS malfunctioning", check whether one of the control modules
may be responsible for the DTC.
All control modules that use the CAN-bus are still disconnected. Ignition is switched off.
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Connect one of the control modules.
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Connect VAS 5051 tester. Switch ignition on, and erase the DTC memory of the control module you just connected. End scan tool output using
the "End Output" function 06.
