A8 Quattro Sedan V8-4.2L (AUX) (2001)
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Connect multimeter (Fluke 83 or equivalent) (voltage measurement range) between engine Ground (GND) and socket 1 of connector.
Specification: approx. 5 V
Checking signal wire for Hall sensor
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Switch ignition on.
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Connect multimeter (Fluke 83 or equivalent) (voltage measurement range) between engine Ground (GND) and socket 2 of relevant connector.
Specification: approx. battery voltage
Checking Ground (GND) wire for Hall sensor:
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Connect multimeter (Fluke 83 or equivalent) (resistance measurement range) between socket 3 on connector and engine Ground (GND).
Specification: Continuity
Resistance in wiring: max. 1.5 Ohms
If all the readouts match the specifications but the diode test lamp does not flash