Primary-Ignition-Testing:  No Start 


Primary-Ignition-Testing

When there is a no-start condition and you discover there is no spark, an easy and quick check in some cases is to check for a primary trigger either with a test light or a lab scope to check for a trigger. 

Diagram of a Primary Ignition Circuit 


Testing for a No Start Condition 

Connect a quality test light to the negative side of the coil and the other end of the test light to ground. 

While the engine is cranking if there is a trigger to the control circuit the test light should blink.


Primary-Ignition-Testing

Primary-Ignition-Testing

Also with a lab scope with the positive lead connected to the negative side of the coil, there should be a control circuit signal on the lab scope screen. 

If the primary circuit test well and there is no spark from the coil, you have a defective coil wire or a defective coil.


There is a mini test coming up with one these video's 



Have A Great Story About This Topic?

If you are in the Update Training Class "UT050" for our asynchronous assignment is for you to read this page and explain your understanding

PRIMARY IGNITION Testing: Choose one of the subjects below (1-2) in two or three sentences in your own words explain what you have learned from this page
1.) There is no spark from the coil wire how can you confirm it’s a defective coil
2.) Explain how you would check for a no-start condition from the ignition system

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