SCV (Suction Control Valve), EGR, and Turbo VNT (if applicable).
Toyota 2KD-FTV ECU (Engine Control Unit) serves as the central hub for managing the 2.5L D-4D common rail diesel engine, found in models like the Toyota Hilux toyota 2kdftv ecu pinout diagram best
The Ultimate Guide to Toyota 2KD-FTV ECU Pinout Diagrams: Best Resources & Decoding SCV (Suction Control Valve), EGR, and Turbo VNT