July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Waveform 6

Igniter IGT signal (from ECM to igniter)
Igniter signal IGF (from igniter to ECM)

Fig 1: Igniter IGT Signal Specifications Table
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Fig 2: Igniter IGT Signal - Waveform
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The wavelength becomes shorter as engine RPM increases.