Subaru Coil-On-Plug (COP) Conversion Wiring Diagram - Coil Pack Plug Pinout

This is a hand-drawn/illustrated wiring diagram for a Subaru coil-on-plug (COP) conversion, showing how four individual coil-on-plug units (labeled Cylinder1 through Cylinder4) are wired to the original coil pack plug. A legend at the top identifies each coil connector's three terminals: Signal, Ground, and Power. The signal wires are color-coded per cylinder: A. Yellow, B. Green/yellow, C. Brown/yellow, D. Blue/yellow. The ground wire is black/yellow and the power wire is black. The original coil pack plug is shown in the center with its pins labeled: Power, Cylinder 1+2, and Cylinder 3+4 (depicted with blue, yellow, brown/black, and red/green wire colors). The diagram shows the black power wire daisy-chained to all four coils, and the black/yellow ground wires from each coil routed to ring terminals with the note 'Ground to nut that bolts to the head.' Signal wires run individually from the coil pack plug to each cylinder's coil. A reader can learn the pinout of each COP connector, the wire color scheme for the conversion harness, and the grounding method (bolted to the cylinder head) needed to convert from a wasted-spark coil pack to individual coil-on-plug ignition.