A6 V6-3.0L (AVK) (2004)
If the multi-pin connectors are firmly seated:
-
Check CAN bus system.
Checking a "two-wire bus system"
The communication between three or more control modules is carried out over a "two- line bus system".
-
Evaluate DTCs stored in control modules.
NOTE: This helps to localize line malfunctions.
Example 1:
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
- No message from control module 2
- No message from control module 3
2
- No message from control module 1
3
- No message from control module 1
-
Switch ignition off.
-
Disconnect control modules linked to one another via bus wires and check whether there is an open circuit between bus wires.
-
If no DTC can be detected in bus lines replace control module 1.
Example 2:
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
- No message from control module 2
2
- No message from control module 1
- No message from control module 3
3
- No message from control module 2
-
Switch ignition off.
-
Disconnect control modules linked to one another via bus wires and check whether there is an open circuit between bus wires.