A8L Quattro Sedan W12-6.0L (BSB) (2005)
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Switch ignition on. Specification: at least 4.5 V
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Switch ignition off.
If no voltage is present:
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Check wires to control module according to wiring diagram.
Check Wires to Control Module
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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,
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Check wires between test box and 3-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram. Terminal
1+Socket 98, Terminal 2+Socket 82, Terminal 3+Socket 90, wire resistance: max. 1.5 ohms
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Check wires for short circuit to each other. Specification: infinite ohms
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Erase DTC memory of Engine Control Module (ECM) => [ Diagnostic Mode 04 - Erase DTC Memory ] See: 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: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes.
If no malfunction is found in the wires and there was voltage between terminals 1 + 3:
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Remove sensor and check sensor wheel for secure fit, damage and run-out.
‹› There is a larger gap on sensor wheel. This gap is a reference mark and not damage.
If no malfunction can be detected at sensor wheel: