2009 Audi A4 Quattro Cabriolet L4-20L Turbo (BWT) Ignition Coil Details
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Remove the Ignition Coil electrical harness screws - 1 -.
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Disconnect the Ignition Coil electrical harness connectors - arrows - from the Ignition Coil.
Checking voltage supply
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Switch the ignition on.
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Using a Multimeter, check the Ignition Coil electrical harness connector terminals 1 to Ground (GND) for voltage.
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 Ignition Coil electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) Power Supply Relay (J271 )
terminal 2/87 for resistance.
Specified value: 1.5 ohms Max.
If the specified value was not obtained:
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Check the Ignition Coil electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) Power Supply Relay (J271 )
terminal 2/87 for an open circuit, short circuit to Battery (+) or Ground (GND).
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Check the wiring connection for damage, corrosion, loose or broken terminals.