2018 Subaru WRX STIFACTORY OEM SERVICE PROCEDURE

Fuel Pump Circuit

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode Ref. to ENGINE (DIAGNOSTICS) (STI)>Clear Memory Mode>OPERATION , and inspection mode Ref. to ENGINE (DIAGNOSTICS) (STI)>Inspection Mode>PROCEDURE .
  1. CHECK OPERATING SOUND OF FUEL PUMP  .

    Make sure that the fuel pump operates for two seconds when turning the ignition switch to ON.

    NOTE: Fuel pump operation can be executed using the Subaru Select Monitor.
    Refer to "Active Test" for the procedures. Ref. to ENGINE (DIAGNOSTICS) (STI)>Active Test .

    Does the fuel pump emit operating sound?

    Yes: Check the fuel injector circuit. Ref. to ENGINE (DIAGNOSTICS) (STI)>Diagnostics for Engine Starting Failure>FUEL INJECTOR CIRCUIT .

    No: Display the DTC. Ref. to ENGINE (DIAGNOSTICS) (STI)>Read Diagnostic Trouble Code (DTC)>OPERATION .

Factory Service Tools

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When to See a Mechanic

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.