A4 Quattro Wagon L4-2.0L Turbo (CAEB) (2009)
Checking voltage
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Using a multimeter, check the Motronic Engine Control Module (ECM) Power Supply Relay (J271) socket 1/30 to Ground (GND).
Specified value: battery voltage.
If the specified value was not obtained:
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Check the wiring connections from the Battery to the Motronic Engine Control Module (ECM) Power Supply Relay (J271) socket 1/30 for an
open circuit or a short circuit.
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Check the wiring connections for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If the specified value was obtained:
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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 3/86 to Ground (GND).
Specified value: battery voltage.
If the specified value was obtained:
Checking wiring
If the manufacturers test box is being used, perform the following step.
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Install the test box.
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).
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Using a multimeter, check the Motronic Engine Control Module (ECM) Power Supply Relay (J271) socket 3/86 to the Motronic Engine Control
Module (ECM) (J623) electrical harness connector T94 terminal 92 for resistance.
Specified value: 2.0 ohms Max.
If the specification was not obtained:
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Check the wiring for a short circuit to Battery (+), or an open circuit.
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring:
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 4/85 to the Motronic Engine Control
Module (ECM) (J623) electrical harness connector T94 terminal 69 for voltage.