This is a common failure on the GM 2.2 Ecotec engine used in the Saturn Ion, Chevy Cavalier, Chevy Cobalt etc., making the testing methods shown very valuable for anyone working in the field. This video makes for a great follow up to my previous video covering Toyota four wire ignition coils. Despite the different designs at work, many of the operating principles are the same.

Engine Performance Diagnostics chapter 22 page 15

symptoms 50

  • check engine light (P0300, P1599)
  • severe lack of power

fix 50

  • replacing the ignition module

test shown enh 50

  • how to use GM misfire data during diagnostics
  • understanding ignition coil control circuit design
  • ignition module transistor operation and testing
  • how to scope test an ignition module with voltage and current
  • how to test an ignition module with a test light
  • how to ohm check an ignition coil primary winding
  • using a flow chart to understand factory testing methods
  • analyzing ignition coil current waveforms

Tools used

  • scan tool
  • lab scope
  • low amp probe
  • incandescent test light
  • digital multimeter

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

Related videos:

How to troubleshoot a no spark condition with a test light (Subaru):


Ford 5.4 shorted coil primary winding and bad computer driver:


How to test an ignition coil with a test light (Nissan C.O.P design):


Ignition coil-module test with test light (a ScannerDanner Premium video):


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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!