S6 Quattro Sedan V10-5.2L (BXA) (2007)
If the specification was obtained:
Checking voltage supply
Crank the engine.
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) 4 (G286) electrical harness connector terminal 4 to Ground (GND) for voltage.
Specified value: Battery voltage.
Switch the ignition off.
If the specification was not obtained:
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Check the electrical harness connector for damage, corrosion, lose or broken terminals.
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Check the wiring from the Heated Oxygen Sensor (HO2S) 4 (G286) electrical harness connector terminal 4 to the Engine Component Power
Supply Relay (J757) socket 2/87 for a short circuit to each other, Ground (GND), or an open circuit.
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If necessary, repair the faulty wiring connection.
If the specification was obtained:
Checking Ground (GND) activation
If the manufacturers test box is being used. Perform the following step.
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Install the test box.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Engine Control Module (ECM) 2 (J624). Refer to => [ Engine Control Module, Removing and Installing ] See: Computers and
Control Systems/Engine Control Module/Service and Repair/Engine Control Module, Removing and Installing.
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) 4 (G286) electrical harness connector to the Engine Control Module (ECM) 2
(J624) electrical harness connector T94b for an open circuit.