A4 Quattro Sedan L4-1.8L Turbo (AEB) (1998)
3
- Missing signal from control module 2
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Switch ignition off.
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Disconnect the control modules connected across the bus wires and check bus wires for open circuit.
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Replace control module 2 if bus wires are OK.
Example 3:
Using DTCs stored in the memories, determined that none of the control modules are sending or receiving signals.
Control module
DTCs stored in module DTC memories:
1
- Hardware faulty
2
- Hardware faulty
3
- Hardware faulty
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Switch ignition off.
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Disconnect the control modules connected across the bus wires and check for a short circuit between the bus wires.
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Check bus wires for short circuit to B+ or Ground (GND).
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If there are no malfunctions found in the bus wires, check whether one of the control modules is responsible for a short circuit of the bus wires to
each other, to B+ or to Ground (GND).
Disconnect each of the control modules connected via the bus wires one at a time and check whether the malfunction "Hardware faulty" has been
eliminated.
If it was eliminated, replace the control module that is currently disconnected. If malfunction was not eliminated, re-connect that control module and
disconnect the next control module connected via the bus wires.