In this video I will show you how to troubleshoot a no spark condition on a Subaru. The testing methods shown can be applied to all systems, not just Subaru.

Engine Performance Diagnostics chapter 22 pages 8-9

symptoms 50

  • No start, no spark

fix 50

  • replace faulty igniter

test shown enh 50

  • how to test an ignition coil for spark
  • how to test for control of an ignition coil with a test light
  • how to test the wiring harness from the ignition coil to the igniter
  • how to test the igniter ground circuit
  • how to test the computer control signals to the igniter
  • how to verify cam and crank sensor signals

Tools used

  • incandescent test light
  • graphing multimeter (Vantage Mt2400)
  • digital multimeter

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(Chapter 22) No Spark Troubleshooting, Ignition Coil & Module Testing

Related videos:

Subaru no spark diagnosis-control testing lecture (ScannerDanner Premium):


How to test for spark with a test light (GM distributor ignition system):


ScannerDanner gets his butt kicked by an '88 F-150 (EEC-IV Ignition):


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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.

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!