A4 Quattro Cabriolet L4-2.0L Turbo (BWT) (2009)
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and if the voltage supply was OK:
Checking wiring
If the manufacturers test box is being used. Perform the following step.
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Install the test box. Refer to Fuel Injection and Ignition Repair Information
If the manufacturers test box is not being used. Perform the following step.
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Remove the Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Replacing ] 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 connector terminal 1 to Engine Control Module (ECM) (J623)
electrical connector T94 terminal 40 for resistance.
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Using a Multimeter, check the Leak Detection Pump (LDP) (-V144-) electrical connector terminal 2 to Engine Control Module (ECM) (J623)
electrical connector T94 terminal 8 for resistance.
Specified value: 1.5 ohms max.
If the specification is not obtained:
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Check the wiring for an open circuit, short circuit to each other, Battery (+), and Ground (GND).
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is found in wiring:
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Erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] See: Computers and Control Systems/Testing and
Inspection/Scan Tool Testing and Procedures/Diagnostic Modes/Diagnostic Mode 04 - Erase DTC Memory.
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Perform a road test to verify repair.
If the DTC does not return: