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HOMESERVICE MANUALSSUBARU1997IMPREZA L, 2D COUPE, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGFUEL INJECTOR CIRCUIT TESTS
1997 Subaru Impreza L, 2D Coupe, Standard

Fuel Injector Circuit Tests

1997 Subaru Impreza L, 2D Coupe, StandardSECTION Fuel Injector Circuit Tests
  1. Check Fuel Injector Operation  - Using a stethoscope, ensure there are injector operating sounds while engine is cranking. If operating sounds are not heard, go to next step. If operating sounds are heard, verify fuel pressure. See FUEL PRESSURE  under FUEL SYSTEM.
  2. Check ECM Output Signal  - Turn ignition on. Backprobe listed ECM connector terminals to check voltage between ECM connector and ground. See ECM CONNECTOR TERMINAL IDENTIFICATION  table. If voltage is more than 10 volts, go to next step. If less than 10 volts are present, check for poor contact in ECM connector and repair harness or connectors as necessary. See appropriate wiring diagram in WIRING DIAGRAMS article.
    ECM CONNECTOR TERMINAL IDENTIFICATION

    ECM Terminal No. Application Cylinder No.
    96 Ground 1
    70 Ground 2
    44 Ground 3
    16 Ground 4
  3. Check Harness Between Fuel Injector & ECM Connector  - Turn ignition off. Disconnect connector from faulty cylinder. Turn ignition on. Check voltage between listed ECM connector and ground on faulty cylinder(s). See ECM CONNECTOR TERMINAL IDENTIFICATION  table. If voltage is more than 10 volts, repair battery short circuit in harness between ECM and fuel injector. After repair, replace ECM. If voltage is less than 10 volts, turn ignition off. Check resistance between fuel injector terminals No. 1 and 2 on faulty cylinder(s). See Fig 1 . If resistance is less than one ohm, replace faulty injector(s) and ECM. If resistance is more than one ohm, check for poor contact in ECM connector. Repair as necessary, replace ECM.
Fig 1: Identifying Fuel Injector & Harness Connector
G97A06790Courtesy of SUBARU OF AMERICA, INC.
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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.