A8L Quattro Sedan W12-6.0L (BSB) (2005)
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Check voltage supply of throttle valve control modules and wiring to control module.
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Check Throttle Position sensor.
If no malfunction is detected in the voltage supply or wiring, replace the engine control module.
Voltage Supply and Wiring to Control Module, Checking
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Connect multimeter to terminals 2 + 6 of connector for voltage measurement.
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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:
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 6-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram: Terminal
1+Socket 92, Terminal 2+Socket 83, Terminal 3+Socket 117, Terminal 4+Socket 84, Terminal 5+Socket 118, Terminal 6+Socket 91, wire
resistance: max. 1.5 ohms