This case study I did on a body shop vehicle covers a lot of starter circuit theory and operation, as well as practical testing methods, making it great viewing for anyone working in the field. Even though the subject is a Neon, the information I cover will apply to all starting systems and standard relays. I also get to show the power of a simple test light, and how valuable it can be in electrical troubleshooting.

Engine Performance Diagnostics chapter 3

symptoms 50

  • engine does not crank
  • “FUSE” message on dashboard

fix 50

  • replace faulty ignition switch

test shown enh 50

  • using a wiring diagram to analyze a starter circuit
  • how to determine if a circuit is power or ground side switched
  • understanding PCM inputs for starter control
  • how to test for main power and solenoid power at the starter
  • how to verify your test light is making good power/ground contact
  • how to check a basic four pin relay with a test light
  • how to check an ignition switch for starter control
  • performing an ignition switch bypass with a test light

Tools used

  • lab scope (a simple DMM may be used)
  • incandescent test light

end faq

{accordionfaq faqid=accordion15 faqclass="dotluvfaq help2 aligncenter headerbackground headerborder contentbackground contentborder round7" active=item0}


(Chapter 3) Transistors, Solenoids, Computer Controlled Output Testing

Related videos:

How to test a starter motor (no crank from a bad block ground) - Nissan:


No Crank Troubleshooting (engine does not crank) - Jeep:


How to troubleshoot a no crank problem (94 Toyota Celica):


Engine does not crank (bad block ground) - Cadillac:


end faq

{accordionfaq faqid=accordion3 faqclass="darkhivefaq defaulticon headerbackground headerborder contentbackground contentborder round5" active=item0}

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.

Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium. There is a 14 day free trial.

On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!