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Home >> Mazda >> 2003 >> Tribute ES, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> System Tests >> Fuel Injector Inspection
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Fuel Injector Inspection

  1. Listen For Injector Operation -  Warm up engine and run at idle (or cranking if engine will not start). Listen for "clicking" sound from fuel injectors (use stethoscope if necessary). If all fuel injectors are "clicking", go to step  3. If all fuel injectors are not "clicking", go to next step.
  2. Check Injector Resistance -  Disconnect suspect injector 2-pin harness connectors. Measure resistance of injectors. If resistance reading is 11-18 ohms at 68°F (20°C), check injector driver circuits from PCM.
    WARNING: Before performing following operation, release fuel pressure from fuel system to reduce possibility of injury or fire. See FUEL PRESSURE RELEASE under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article.
  3. Check Injectors For Fuel Leakage -  Remove fuel rail assembly from intake manifold. Connect fuel lines. Disconnect Inertia Fuel Shutoff (IFS) switch 3-pin harness connector. Install fused jumper wire between battery positive and IFS switch terminal No. 2 (Pink/Black wire) to run fuel pump. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. Check for fuel leaks from injectors. If fuel leakage is less than one drop per 2 minutes, fuel injectors are okay. If fuel leakage is more than one drop per 2 minutes, replace leaking fuel injector. Replace O-rings and check for fuel rail damage. Repair or replace as necessary.
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