A4 Quattro Cabriolet L4-2.0L Turbo (BWT) (2009)
Main Relay (Computer/Fuel System): Testing and Inspection
Engine Component Power Supply Relay, Checking
Engine Component Power Supply Relay, Checking
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› Fuse Strip (S88) OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, selector lever in position " P" or "N".
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Ignition switched off.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to => [ General Diagnosis ] See: Testing and Inspection/Initial Inspection
and Diagnostic Overview/General Diagnosis.
Start diagnosis
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Using a Multimeter, check the following wiring connection for voltage.
Specified value: 12.5 V
If the specified value was not obtained:
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Using a Multimeter, check the Engine Component Power Supply Relay (J757) socket 1/30 to the Battery (A) (+) terminal for an open circuit or
short to Ground (GND).
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Check the electrical harness connectors for damage, corrosion, loose or broken terminals.
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If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
Checking activation
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Switch the ignition on.
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Using a Multimeter, check the following wiring connection for voltage.
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Switch the ignition off.