A4 Quattro Sedan L4-1.8L Turbo (AWM) (2001)
Diagnostic Test Mode (DTM) (Function 03)" See: Computers and Control Systems/Testing and Inspection
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LED must blink.
If LED does not blink or if it remains constantly lit:
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Connect VAG1598/31 test box at wiring harness to Engine Control Module (ECM), do not connect ECM. Refer to "Scan Tool Testing/Wire and
Component Testing Using VAG1598/31 Test Box" See: Computers and Control Systems/Testing and Inspection
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Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:
Harness connector
VAG1598/31 test box
Terminal
Socket
2
64
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Repair open circuit or short circuit if necessary.
If wire connection is OK:
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Replace Engine Control Module (ECM).