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Home >> Audi >> 1991 >> 80 Base, 2.3 D, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Fuel System (2.3L) >> Fuel Pressure (2.3L) >> Fuel Pump Relay (2.3L)

Fuel Pump Relay (2.3L)

  1. With ignition off, remove fuel pump relay from relay panel. Connect multimeter between relay terminals No. 48 and No. 50. See Fig 1 . Multimeter should read battery voltage.
  2. Connect multimeter between terminals No. 46 and No. 50. Turn ignition on. Multimeter should read battery voltage.
  3. If multimeter does not read as specified, repair break in wiring. Connect multimeter between terminals No. 46 and No. 47. Momentarily engage starter. Multimeter should indicate 7 volts.
  4. If multimeter does not indicate 7 volts, partially remove Ignition Control Unit (ICU) and disconnect harness connector. Turn ignition off. Using an ohmmeter, check continuity between ICU and fuel pump relay.
  5. Connect ohmmeter between ICU connector terminal No. 3 and relay terminal No. 49, and between ICU connector terminal No. 14 and relay terminal No. 47. See Fig 1 and Figure . Ohmmeter should indicate .2 ohm each time.
  6. If reading is not .2 ohm, repair break in wiring. If reading is .2 ohm, replace knock sensor.
Fig 1: Checking Fuel Pump Relay Circuit (2.3L)
G94349Courtesy of AUDI OF AMERICA, INC.
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