1997 Subaru Legacy Outback, AutomaticFACTORY OEM SERVICE PROCEDURE

Fuel Pump Circuit Tests

  1. Check Fuel Pump Operation  - Connect test mode connector and turn ignition on. Ensure fuel pump operates for 2 seconds after turning ignition on. If fuel pump operates for 2 seconds, check fuel injector circuit. See FUEL INJECTOR CIRCUIT TESTS  . If fuel pump does not operate, go to next step.
  2. Check Fuel Pump Ground Circuit  - Turn Ignition switch off. Disconnect connector from fuel pump. Check resistance of fuel pump harness 6-pin connector terminal No. 4 and ground. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in fuel pump ground circuit.
  3. Check Fuel Pump Power Supply  - Turn ignition switch on. Check voltage between fuel pump 6-pin connector terminal No. 1 and chassis ground. Voltage should be 10 volts minimum. If voltage is 10 volts or more, replace fuel pump. If voltage is less than 10 volts, go to next step.
  4. Check Harness Between Fuel Pump & Fuel Pump Relay Connector  - Turn ignition off. Measure resistance between harness 6-pin connector terminal No. 1 and fuel pump relay 4-pin connector terminal No. 4. Resistance should be less than one ohm. If resistance is more than one ohm, repair open in harness between fuel pump and fuel pump relay connector. If resistance is less than one ohm, check fuel pump 6-pin connector terminal No. 1 and chassis ground. Resistance should be more than one megohm. If resistance is less than one megohm, repair short in harness between fuel pump and fuel pump relay connector.
  5. Check Fuel Pump Relay  - Disconnect fuel pump relay connector and main relay. Remove fuel pump relay and main relay from bracket. Connect battery voltage and ground to fuel pump relay terminals No. 1 and 3. Ensure there is less than 10 ohms resistance between terminals No. 2 and 4. If resistance is less than 10 ohms, go to next step. If resistance is greater than 10 ohms, replace fuel pump relay. See Fig 1 . See appropriate wiring diagram in WIRING DIAGRAMS article. If fuel pump relay does not click, replace relay. If fuel pump relay clicks, verify zero ohms resistance between terminals No. 2 and 4. If resistance is as specified, go to next step. If resistance is not as specified, replace fuel pump relay.
  6. Check Harness Between ECM & Fuel Pump Relay Connector  - Disconnect connectors from ECM. Measure resistance of harness between ECM connector terminal No. 32 and fuel pump relay 4-pin connector terminal No. 3. Resistance should be less than one ohm. If resistance is less than one ohm, check for poor contact in ECM connector. If resistance is more than one ohm, repair open circuit in harness between ECM and fuel pump relay.
Fig 1: Identifying Fuel Pump Relay Connector
G93J80001Courtesy of SUBARU OF AMERICA, INC.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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