Checking fuel pump (electrical test) - vehicles with 6-cylinder turbo engine — AUDI
Checking fuel pump (electrical test) - vehicles with 6-cylinder turbo engine on Audi: factory workshop procedure for engines AAH, ABC, ACK, ACZ.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
🔧 Engine codes this applies to
📐 15 workshop diagrams for AAH
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
ABC ACK ACZ ADP ADR AEB AFC AFY AGA AGB AHL AJG AJL ALF ALG ALW ALZ AML AMM AMX ANA ANB APR APS APT APU APZ AQD ARG ARJ ARK ARM ASJ ATW ATX AVV AWT AZB AZR
Special tools, testers and auxiliary items
Remote control V.A.G 1348/3A with adapter cable V.A.G 1348/3-2
Hand multimeter V.A.G 1526 or V.A.G 1526 A
Adapter set V.A.G 1594 A
Requirements for test:
Battery voltage not less than 12 V
Fuse No. 28 OK
Relay 6 in central electrics unit OK
Fuel filter OK
Ignition switched off
Test sequence
Open fuse box cover on the left side of the dashboard panel.
Pull fuse No. 28 off fuse carrier (left row, 5th large fuse from the top).
Connect remote control V.A.G 1348/3A with adapter cable V.A.G 1348/3-2 to right-hand terminal of fuse socket No. 28 -arrow-.
Connect clamp to vehicle battery (+).
Press remote control switch.
Pump should start running audibly.
Note:
The fuel pump runs very quietly. Where possible, avoid noisy surroundings for this test.
If pump does not start running:
Detach trim in luggage compartment.
Unbolt cover for flange on fuel tank under floor trim in luggage compartment.
Release and unplug 4-pin connector -1-.
Set hand-held multimeter V.A.G 1526 to voltage measuring range (20 V direct current) and connect to contact 1 (green/yellow) and contact 4 (brown) of connector using test leads from V.A.G 1594 A.
Press and hold remote control switch, and read off voltage.
Specification: approx. battery voltage
If the specification is obtained, even though the fuel pump did not run, remove flange as follows:
Warning!
Fuel system is under pressure! Before opening the system place a cloth around the connection. Then release pressure by carefully loosening the connection.
Mark the supply pipe -2- and return pipe -3-, then pull pipes off flange.
Remove union nut with spanner 3217.
Remove flange and seal out of opening in fuel tank.
Check that the electrical wires between flange and fuel pump are connected and test for continuity.
If no wiring fault is detected:
Fuel pump is defective. Renew fuel delivery unit =>Page
20-93
.
Install flange => Page
20-34
.
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
Ask about my car →Other AUDI procedures
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.