A8L Quattro Sedan V8-4.2L (BVJ) (2007)
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Operate the starter briefly.
Specified value: battery voltage.
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Switch the ignition off.
If the specified value 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 connection from the Leak Detection Pump (LDP) (-V144-) electrical harness connector terminal 3 to theEngine Component
Power Supply Relay (J757) terminal 2/87 for an open circuit or short to ground (GND).
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If necessary, repair the faulty wiring connection.
It the specification was obtained.
Checking wiring
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 Motronic Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Removing and Installing ] See: Computers
and Control Systems/Engine Control Module/Service and Repair.
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Using a Multimeter, check the Leak Detection Pump (LDP) (-V144-) electrical harness connector terminals to theMotronic Engine Control
Module (ECM) (J623) electrical harness connectors T94 terminals for an open circuit.