: The ECU transitioned from a 2-group injection pattern to Sequential Multiport Fuel Injection in later versions to improve air-fuel ratio precision.
Use a small jeweler's screwdriver or a depinning tool. Slide the screwdriver into the terminal slot to release the locking tab. Pull the wire gently from the back. Never cut wires if you plan to reuse the ECU. 3s-fe ecu pinout pdf