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Home >> Audi >> 1995 >> 90 Base, 2.8 A, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Fuel Delivery >> Fuel Pump Circuit Without Scan Tester
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Fuel Pump Circuit Without Scan Tester

  1. Ensure fuse No. 13 is okay. See ELECTRICAL COMPONENT LOCATIONS  . Ensure fuel filter is okay and battery is fully charged. While operating starter for several seconds, measure voltage at fuse No. 13.
  2. If battery voltage is not present, go to next step. If battery voltage is present, check for open circuit between fuse No. 13 and fuel pump, and between fuel pump and ground. If circuit is okay, replace fuel pump.
  3. Check fuel pump relay. See FUEL PUMP RELAY - WITHOUT SCAN TESTER. If fuel pump relay is okay, remove it. Turn ignition on. Check voltage at fuel pump relay terminals No. 46 and 48. See Figure . If battery voltage is not present, repair relay power supply circuit.
  4. If battery voltage is present, check for open circuit between fuel pump relay connector terminal No. 52 and fuse No. 13. If circuit is okay, check for open circuit between fuel pump relay connector terminal No. 47 and PCM. If circuit is okay, replace PCM.
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