Toyota calls it the "EWD" (Electrical Wiring Diagram). Honda calls it the "Shop Manual." These are 1,000+ page PDFs where the last 200 pages are dedicated to ECU pinouts and connector views.
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While Mitsubishi and Nissan often use proprietary or Hitachi units, certain models—especially diesel variants using common rail injection—utilize specialized Denso hardware. 4. Step-by-Step Guide to Identifying Your Denso ECU Toyota calls it the "EWD" (Electrical Wiring Diagram)
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If you need help decoding a specific vehicle layout, tell me the of your vehicle, the engine code , or the part number printed on your ECU sticker. I can help you locate or verify the exact wire connections you need. Share public link
Whether you are swapping an engine, diagnosing a stubborn wiring fault, or installing a standalone piggyback system, knowing exactly what each pin on the ECU connector does is the difference between a successful project and fried electronics. What is a Denso ECU Pinout Database?
Once you have a pinout diagram, here's how to interpret it. Most diagrams consist of three key parts: