I will show you how to troubleshoot the entire ignition system, including cam and crank signals, ECU to igniter control and igniter to ignition coil control using a simple test light. A follow up test will be done with a small single channel lab scope, showing yet another way to verify the same condition.

This case study is perfect for anyone interested in the working details of Toyota/Lexus coil over plug ignition system, and the very similar three-wire designs used by many other manufacturers.

This vehicle came in with a long history, a severe misfire complaint that two shops couldn’t fix, and lots of parts changing along the way.

In this video I will show you how to use simple, fast testing methods to determine diagnostic direction with a no start condition.