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 Engine Control Module according to wiring diagram.
Checking wires to Engine Control Module
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,
Cylinder bank 2
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Connect test box to Engine Control Module (ECM) 2 (J624) wiring harness on connecting test box for wiring test.
Cylinder bank 1 and 2
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Check wires between test box and 3-pin connector to Engine Control Module for open circuit according to wiring diagram. Wiring resistance:
max. 1.5 ohms
Cylinder bank 1