The procedures shown in this video will help you isolate the cause of a no start, no spark condition on a Toyota or Lexus system that uses an igniter built separately from the ignition coil. On 3 and 4 wire coil over plug systems, the igniter is actually built into the ignition coil. Similar procedures can be performed on those designs as well.
With any no spark condition, you need to determine if you have an input or output problem. If you can simulate the signals the engine computer uses to control the igniter, you can troubleshoot the problem area very quickly.

Engine Performance Diagnostics chapter 22 page 8 and chapter 2 page 24

test shown enh 50

  • how to determine pull-up or pull-down circuitry
  • how to read a wiring diagram
  • how to "be the computer" and trigger the igniter to fire the coil

Tools used

  • incandescent test light
  • digital multimeter

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

Related videos:

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


Ignition coil and module test with test light (ScannerDanner Premium lecture):


Honda Civic 1.5 misfire, weak spark (bad igniter):


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


Basic Ignition Description, Operation and Testing (any car):


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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!