A4 Quattro Wagon V6-3.0L (AVK) (2002)
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If the correct control modules are installed:
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Check that multiple connectors for control modules are properly seated.
If the multi-pin connectors are firmly seated:
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Check CAN bus system.
Checking a "two-wire bus system"
The communication between three or more control modules is carried out over a " twoline bus system".
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Evaluate DTCs stored in control modules.
NOTE: This helps to localize line malfunctions.
Example 1:
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The DTCs stored in the DTC memories indicate that the control module 1 does not communicate with control modules 2 and 3.
Control module
DTCs stored in DTC memory
1
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No message from control module 2
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No message from control module 3
2
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No message from control module 1
3
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No message from control module 1
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Switch ignition off.
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Disconnect control modules linked to one another via bus wires and check whether there is an open circuit between bus wires.
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If no DTC can be detected in bus lines exchange control module 1.
Example 2:
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The DTCs stored in the DTC memories indicate that the control module 2 does not communicate with control modules 1 and 3.
Control module
DTCs stored in DTC memory
1
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No message from control module 2
2
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No message from control module 1
