Terminal release tool (small flathead), replacement pins (from Toyota or Ballenger Motorsports), and the official Toyota Electrical Wiring Diagram (EWD).
Always confirm pin position by number, not color alone. The pinout’s position is consistent; the wire color is a guide. If you’re building an off-road buggy or custom 4×4, you might need to depin the ECU connectors. 1kz ecu pinout
When the engine starts cutting out under load, refuses to start when hot, or logs a hard-to-read check engine light, the first place a professional mechanic turns is the . Terminal release tool (small flathead)