Tom demonstrates a hands-on oscilloscope analysis of the Electronic Spark Advance (ESA) ignition system on a 1994 Toyota Tercel 1.5L, walking through probe hookup, scope settings, and waveform interpretation for the IGF, IGT, coil primary voltage, and primary current signals.

The demo covers:

• Capturing a cold start event using a single trigger
• Analyzing waveform behavior at varying RPMs using a repeat trigger
• Inducing and capturing an IGT failure using a grounded test light
• Inducing and capturing an IGF failure and observing its effect on both ignition and fuel injection
• Using scope triggering strategies to isolate and capture specific signal failures