https://dannysengineportal.com/coil-on-plug-ignition-system-cop-function-failure-diagnosis/
The most sophisticated, of all ignition systems. The coil on plug ignition system, places an ignition coil, directly on the top of each spark plug.
As a result, the coil on plug ignition system, eliminates the need for distributors and spark plug wires.
So, with the coil on plug ignition system, ignition timing, is handled by the (ECU), based on inputs from various sensors.
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