Fuel pump, checking: Checking

WARNING: This page is about a different car, the 1999 Audi A8, 1998 Audi A8, and 1997 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.

Connect remote control. See FUEL PUMP, CHECKING .
Remove cover under luggage compartment trim at left rear.
Disconnect fuel pump and level sensor harness connector.
Press and hold remote control switch, and check for voltage between connector terminals 1 (green) and 4 (brown). See Fig 1 .
Specified value: approx. battery voltage

Fig 1: Checking For Voltage Between Connector Terminals 1 (Green) And 4 (Brown)

If voltage is OK:

Reconnect harness connector, actuate remote control, and make sure fuel pump runs.

If fuel pump does not run:

Remove fuel pump (FUEL PUMP WITH INTEGRATED RESERVOIR, REMOVING AND INSTALLING ) and check for continuity between harness connector, connector on housing, and fuel pump.
Specified value: 0 ohm (continuity)

Fig 2: Checking For Continuity Between Harness Connector, Connector On Housing, And Fuel Pump

If there is no continuity:

Repair or replace wiring.

If wiring is OK (and fuel pump does not run):

Replace fuel pump.