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Example 1:
Faults entered in fault memories reveal that control unit 1 has no link with control units 2 and 3.
Control unit Faults entered in fault memory
1 - No message from control unit 2
- No message from control unit 3
2 - No message from control unit 1
3 - No message from control unit 1
- Switch off ignition.
- Disconnect control units linked by bus wires and examine bus wires for open circuit.
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
- Replace control unit 1 if no faults are found in bus wires.
Example 2:
Faults entered in fault memories reveal that control unit 2 has no link with control units 1 and 3.
Control unit Faults entered in fault memory
1 - No message from control unit 2
2 - No message from control unit 1
- No message from control unit 3
3 - No message from control unit 2
- Switch off ignition.
- Disconnect control units linked by bus wires and examine bus wires for open circuit.
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
- Replace control unit 2 if no faults are found in bus wires.
Example 3:
Faults entered in fault memory reveal that none of the control units can transmit or receive.
Control unit Faults entered in fault memory
1 - e.g. Drive train data bus defective
2 - e.g. Drive train data bus defective
3 - e.g. Drive train data bus defective
- Switch off ignition.
Audi A3 1997 ➤
Electrical system Self-diagnosis - Edition 02.2002
3.14 - Checking data exchange between control units 111
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