The transition from mechanical to electronic systems has rendered the simple multimeter insufficient for diagnosing modern vehicles. An automotive oscilloscope captures voltage over time, revealing:
He switched the scope leads. He moved from the high-voltage ignition system to the low-voltage ground strap of the engine block. He set the scope to a millisecond timebase, a scale so small human reaction time couldn't comprehend it. pdf automotive oscilloscopes waveform analysis
Compare a "known good" waveform from a previous job to a "suspect" vehicle. The transition from mechanical to electronic systems has