This owner of this truck installed a new plug and coil on the #6 cylinder and still continued to have a misfire. Knowing this information affected my approach. I start this process with an injector balance test and confirmed cylinder compression before moving to the ignition system.

Engine Performance Diagnostics chapters 22

symptoms 50

  • misfire (P0306)

fix 50

  • repaired corroded power feed wire to the ignition coil

test shown enh 50

  • fuel injector balance (flow) test
  • how to test a 3 wire coil over plug ignition coil
  • coil primary current ramp test with a scope
  • how to locate an open wire

Tools used

  • fuel pressure gauge
  • scan tool
  • inductive low amp probe
  • digital multimeter

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

Related videos:

Operation and testing coil over plug ignition (4 wire) - Toyota/Lexus :


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


How to identify a shorted ignition coil (Honda):


Ignition System Designs, Operation and Testing (an SD 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!