RS 4 Quattro Cabriolet V8-4.2L (BNS) (2008)
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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 3/85 to Ground (GND) for voltage.
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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): Fuel Injection and Ignition 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 3/85 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 => [ Engine Control Module 1, Removing and Installing ] See: Service and
Repair/Engine Control Module 1, Removing and Installing.
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 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 Motronic Engine Control Module (ECM) ( J623) or the Engine Control Module (ECM) 2 (J624 ). Refer to => [ Engine Control
Module 1, Removing and Installing ] See: Service and Repair/Engine Control Module 1, Removing and Installing.
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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 T94 terminals or the Engine Control Module (ECM) 2 (J624) electrical harness connector
T94a terminals for resistance.
