A8 Quattro Sedan V8-4.2L (BGK) (2006)
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Operate starter briefly.
Specified value: approx. battery voltage
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Switch ignition off.
If the specified values are not reached, check wire connection.
Wire Connections, Checking
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Connect test box (VAG1598/31) to harness connectors of wiring harness (do not connect ECM). Connect Ground (GND) clip at test box (not
visible in illustration) to Ground (GND), refer to Repair Manual.
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Check the following wire connection for open circuit and short circuit to Ground (GND) and B+: