Probing the ignition coil’s secondary side (or using an inductive pickup). The Look: A long horizontal line (dwell) followed by a sharp vertical spike (firing line) that drops into a sloped plateau (burn time) before falling to zero.
Unlike a multimeter that gives you an average value, an oscilloscope displays . This allows you to: pdf automotive oscilloscopes waveform analysis
Document the customer's exact symptom and any active Diagnostic Trouble Codes (DTCs). Probing the ignition coil’s secondary side (or using