However, if you are performing an engine swap or troubleshooting a "crank but no start" condition, the biggest hurdle is often the electronics. Understanding the is essential for getting the wiring right. Why You Need a 3S-FE ECU Pinout
If you want, tell me the exact vehicle model/year and ECU part number and I’ll produce a concise printable pinout table you can export to PDF. 3s-fe ecu pinout pdf