R8 Quattro Coupe V10-5.2L (BUJ) (2010)
open or short circuit.
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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 value was obtained:
Checking activation
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Switch the ignition on.
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Using a Multimeter, check the Motronic Engine Control Module (ECM) Power Supply Relay (J271) socket 8/87 to Ground (GND).
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Switch the ignition off.
Specified value: 0.5 V Max.
If the specified value was obtained:
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Replace the Motronic Engine Control Module (ECM) Power Supply Relay (J271). Refer to appropriate repair information.
If the specified value was not obtained:
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Check the wiring from the Motronic Engine Control Module (ECM) Power Supply Relay (J271) socket 6/85 to the Motronic Engine Control
Module (ECM) (J623) electrical harness connector T94 terminal 69 for a short to Ground (GND) or an open circuit.
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If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring and voltage supply was not OK:
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Replace the Motronic Engine Control Module (ECM) (J623). Refer to appropriate repair information.
Checking Engine Control Module (ECM) 2 (J624) voltage
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Switch the ignition on.
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Using a Multimeter, check the Motronic Engine Control Module (ECM) Power Supply Relay (J271) socket 2/87 to Ground (GND) for voltage.
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Switch the ignition off.
Specified value: battery voltage.
If the specified value was not obtained:
Checking wiring
If the manufacturers test box is being used, perform the following step.
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Install the test box. Refer to appropriate repair information.
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) or the Engine Control Module (ECM) 2 (J624). Refer to appropriate repair
information.
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Using a Multimeter, check the Motronic Engine Control Module (ECM) Power Supply Relay (J271) socket 2/87 to the Motronic Engine Control
Module (ECM) (J623) electrical harness connector T94a terminals or the Engine Control Module (ECM) 2 (J624) electrical harness connector
T94d terminals for resistance.