Coil-on-plug (COP) ignition systems have become standard in modern vehicles, offering improved efficiency and reliability compared to traditional distributor-based systems. At the heart of understanding and troubleshooting these systems lies the coil on plug wiring diagram. This diagram serves as a roadmap, illustrating the electrical connections within the COP system, and is essential for diagnosing issues and ensuring proper functionality. Ignoring this diagram can lead to incorrect repairs and further complications within the vehicle’s engine management system. Therefore, understanding how to use and interpret a COP wiring diagram is a valuable skill for any automotive technician or enthusiast.