A8L Quattro Sedan V8-4.2L (BVJ) (2007)
Checking voltage supply
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Crank the engine.
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Using a Multimeter, check the Ignition Coil electrical harness connector terminal 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 theMotronic Engine Control Module (ECM) Power Supply Relay (J271) socket
2/87 for resistance.
Specified value: 1.5 ohms Max.
If the specified value was not obtained:
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Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
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Check the wiring connection for damage, corrosion, lose or broken terminals.
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If necessary, repair the faulty wiring connection.
If the specified values were obtained:
Checking Ground (GND)