A8L Quattro Sedan W12-6.0L (BSB) (2005)
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Operate starter and test ignition signal from the corresponding Engine Control Module (ECM). LED must flicker
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Repeat test at connectors for ignition coils cylinder 2 through 12.
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Switch ignition off.
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Place fuses 29 and 30 for fuel injectors 1 to 12 back in the fuse holder.
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Fuse holder in right of instrument panel.
If LED flickers and voltage supply is OK:
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Replace respective ignition coils with power output stage, ignition coils with power output stages, removing and installing.
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Erase DTC memory of Engine Control Module (ECM) => [ Diagnostic Mode 04 - Erase DTC Memory ] See: Computers and Control
Systems/Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Modes 01 - 09, Diagnostic mode 4: Reset/erase diagnostic data.
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Generate readiness code => [ Readiness Code, Generating ] See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive
Cycles and Readiness Codes.
If LED does not flicker:
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Check wires to Engine Control Module according to wiring diagram.
Checking wires to Engine Control Module
Cylinder bank 1
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Connect test box to Engine Control Module (ECM) (J623) wiring harness on connecting test box for wiring test, refer to Repair Manual,