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Fuel Injector Circuit Diagnosis

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. Go to next step.
  2. Turn ignition off. Disconnect all fuel injector harness connectors. Install Fuel Injector Test Light (J-34730-2B) to each fuel injector harness connector one at a time. Observe injector test light for each injector while cranking engine. If injector test light flashes for each injector while cranking engine, perform fuel injector coil test. See INJECTOR COIL TEST - ECT IS 50-95°F  . If injector test light does not flash for each injector while cranking engine, go to next step.
  3. If injector test light remained illuminated for any injector while cranking engine, go to next step. If injector test light does not remain illuminated for any injector while cranking engine, go to step  5 .
  4. Check for short to ground in faulty fuel injector control circuit between fuel injector and PCM. See appropriate wiring diagram in WIRING DIAGRAMS article. If problem exists, repair as necessary and go to step  11 . If problem does not exist, go to step  10 .
  5. Remove fuel injector test light from fuel injector harness connector. Connect a test light between ground and ignition feed circuit of fuel injector harness that did not flash. See appropriate wiring diagram in WIRING DIAGRAMS article. Turn ignition on, engine off. If test light illuminates, go to next step. If test light does not illuminate, go to step  8 .
  6. Connect a test light between battery voltage and fuel injector control circuit of fuel injector harness that did not flash. See appropriate wiring diagram in WIRING DIAGRAMS article. Observe test light while cranking engine. If test light flashes while cranking engine, go to next step. If test light does not flash while cranking engine, go to step  9 .
  7. Repair poor connections at fuel injector harness connector. After repairs, go to step  11 .
  8. Repair open in ignition feed circuit between fuel injector and main relay. After repairs, go to step  11 .
  9. Check for open in faulty fuel injector control circuit. Repeat test procedure beginning at step 2)  until test light flashes for all injectors. If problem exists, repair as necessary and go to step  11 . If problem does not exist, go to next step.
  10. Replace PCM. After repairs, go to next step.
  11. Operate vehicle within conditions under which original symptom was observed. If system operates properly, system is okay. If system does not operate properly, check for contaminated fuel, faulty injector spray pattern, leaking or stuck closed injector, poor connections or terminals in wiring harness connectors.
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