A4 Quattro Cabriolet L4-2.0L Turbo (BWT) (2009)
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Using a Multimeter, check the following wiring connection for voltage.
Specified value: 12.5 V
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Switch the ignition off.
If the specified value was not obtained:
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Check the Engine Control Module (ECM) (J623) electrical harness connector terminal T94/65 to the Voltage Regulator (VR) (C1) terminal DF for
an open circuit or short to Ground (GND).
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Check the electrical harness connectors for damage, corrosion, loose or broken terminals.
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If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
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Switch the ignition on.
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Using a Multimeter, check the following wiring connections for voltage.
Specified value: 12.5. battery voltage.
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Switch the ignition off.
If the specified value was not obtained:
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Check the Engine Control Module (ECM) (J623) electrical harness connector terminals T94/3, T94/5, T94/6 to the Motronic Engine Control
Module (ECM) Power Supply Relay (J271 ) socket 2/87 for an open circuit or a short to 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 wiring connection.
If no malfunctions are found in the wiring:
Checking Ground (GND)
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Using a Multimeter, check the following wiring connections for an open circuit.
Specified value: 1.5 ohms.
If any of the specified values are not obtained:
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Check the Engine Control Module (ECM) (J623) electrical harness connector terminals to the following Ground (GND) locations for an open
circuit or a short to Battery (+).