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Audi Workshop Service and Repair Manuals

Engine Component Power Supply Relay, Checking|Page 3225 > < Engine Component Power Supply Relay, Checking|Page 3223
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Main Relay (Computer/Fuel System): Testing and Inspection
Voltage Supply, Checking

Voltage Supply, Checking

Observe all safety precautions: => [ Safety Precautions ] See: Computers and Control Systems/Service Precautions/Safety Precautions

View clean working conditions: => [ Clean Working Conditions ] See: Computers and Control Systems/Service Precautions/Clean Working
Conditions

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.

Special tools, testers and auxiliary items required

‹›  

‹› multimeter.

‹› Wiring diagram.

Test requirements

‹›  The Motronic Engine Control Module (ECM) ( J623 ) fuses 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

-

Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Computers and Control Systems/Testing
and Inspection/Scan Tool Testing and Procedures/Preliminary Check

Start diagnosis

-

Remove the Motronic Engine Control Module (ECM) Power Supply Relay (J271).

Engine Component Power Supply Relay, Checking|Page 3225 > < Engine Component Power Supply Relay, Checking|Page 3223