Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Oscilloscope Patterns and Waveforms

PRIMARY SIGNAL OF IGNITION COIL

1. Run the engine at an idle speed.

Primary Signal Of Ignition Coil:





2. Connect the probe to oscilloscope pick-up point 1 as shown in the circuit diagram, and check the primary signal of the ignition coil.

CONTROL SIGNAL OF IGNITION POWER TRANSISTOR


Control Signal Of Power Transistor:





Connect the probe to oscilloscope pick-up point 2 as shown in the circuit diagram, and check the control signal of the ignition power transistor.