Pins for the four fuel injectors (No. 1 through No. 4) connect through various junction blocks to the main battery power. Critical inputs include the Mass Air Flow (MAF) Throttle Position (TP) sensor, and Engine Coolant Temperature
Conclusion This overview gives a practical starting point for working with the 2NZ-FE ECU. For any wiring repair, always cross-check a factory wiring diagram for your vehicle year and market — pin assignments can change. If you’d like, tell me the exact Toyota model and year and I’ll draft a model-specific wiring pinout and a printable PDF-style layout. 2nz Fe Ecu Pinout Pdf 186