In this video I’ll show how to do some simple but effective test on a Nissan fuel injector circuit. Note the injector sound test with a screwdriver - keeping it simple! Though I performed the voltage testing with a scope, a digital multimeter would have worked just as well in this case. No reason to disconnect the PCM and ohm check the harness, as the factory flow chart would have you do. The testing demonstrated applies to ALL ground side switched injectors and outputs. Before doing any testing on computer outputs, please refer to my video on identifying circuit design for more information:

Engine Performance Diagnostics chapter 3 pages 2 -19

symptoms 50

  • misfire
  • check engine light (P0302)

fix 50

  • replace #2 fuel injector

test shown enh 50

  • how to perform a fuel injector sound test
  • how to identify circuit design without a wiring diagram
  • how to verify an injector power feed circuit
  • how to check a ground side switched circuit for control and a short to ground using a test light
  • how to ohm test a fuel injector

Tools used

  • screwdriver
  • lab scope
  • incandescent test light

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Chapters 17, 18 and 19) Fuel Injector Testing

Related videos:

How to test a fuel injector circuit with a noid light (a ScannerDanner Premium video):


How to test a fuel injector circuit with basic tools (open control wire):


Stuck Open Fuel Injector (how to fix):


How to test a computer controlled solenoid - power/ground side identification:


GM EVAP Vent Solenoid Testing:


How to test a computer transistor driver (with a scan tool):


How to test a computer transistor driver (without a scan tool):


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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

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