Here Toyota Engine 4A-GE 20V wiring diagram. This engine wiring diagram can be used to install engine performance part of your car. This Toyota engine wiring diagram show the left fender wiring along with ECU connector and pin out. Blue wires schema is for starter wiring, pink for igniter wiring, red for interior power source, and green for 2 sensor wiring. Full 4A-GE 20V Wiring Diagram here.