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Fuel Pump Relay Control

  1. With ignition off. Remove fuel pump relay from relay panel. Connect multimeter between terminals No. 48 and No. 50 of relay socket. See Fig 1 .
  2. Multimeter should read 12 volts. Connect multimeter between terminals No. 46 and No. 50 of relay socket. Turn ignition on. Multimeter should read 12 volts.
  3. If multimeter does not read as specified, repair break in wiring Connect multimeter between terminals No. 46 and No. 47 of relay socket. Momentarily engage starter. Multimeter should read 7 volts.
  4. If multimeter does not read 7 volts, partially remove ICU and disconnect harness connector. Using a multimeter, check continuity between ICU and relay socket.
  5. Connect terminal No. 3 of ICU connector to terminal No. 49 of relay socket. Connect terminal No. 14 of ICU and terminal No. 47 of relay socket. Multimeter should read .2 ohm.
  6. If reading is not as specified, repair break in wiring. If reading is as specified, replace knock sensor.
Fig 1: Fuel Pump Terminals at Relay Panel
G94349Courtesy of AUDI OF AMERICA, INC.
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