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The Nissan YD25DDTi engine is a staple in the and Pathfinder (R51) . Because this engine relies on a sophisticated Common Rail System , understanding the ECU (Engine Control Unit) pinout is critical for troubleshooting sensor failures or installing performance modifications. 📍 ECU Location

| Pin (Connector) | Function | Signal Type | Typical Color | |----------------|----------|-------------|----------------| | E16-1 | Injector #1 (Cyl1) | High-side driver | White | | E16-2 | Injector #2 (Cyl2) | High-side driver | Yellow | | E16-3 | Injector #3 (Cyl3) | High-side driver | Green | | E16-4 | Injector #4 (Cyl4) | High-side driver | Blue | | E16-22 | 5V Sensor Reference | 5.0V ±0.1V | Red/Black | | E16-23 | Sensor Ground | 0V | Black/White | | E17-7 | Rail Pressure Sensor Signal | 0.5–4.5V | Purple/White | | E17-9 | Crank Position Sensor (+) | Variable reluctor | Shielded pair | | E17-26 | Accelerator Pedal Position (APP1) | 0.5–4.5V | Green/White | | F38-1 | CAN High (Diagnostic) | 2.5–3.5V | Light Green | | F38-2 | CAN Low (Diagnostic) | 1.5–2.5V | Light Blue | | F38-14 | K-Line (ISO 9141-2) | 0–12V | Yellow/Red |

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To help you find the exact diagram, could you tell me the of your vehicle and if it's a D22, D40, or R51 model?

| Pin | Function | Note | | :--- | :--- | :--- | | B01 | Main relay control | Switched ground | | B09 | Fuel pressure regulator (SCV) | PWM, ~140 Hz | | B11 | Injector cylinder 1 (high side) | 80V peak-hold | | B23 | Injector cylinder 2 | | | B35 | Injector cylinder 3 | | | B47 | Injector cylinder 4 | | | B51 | Glow plug relay control | | | B68 | EGR vacuum solenoid | |

Multiple pins bolted directly to the chassis or engine block to prevent electrical noise. 2. Fuel System Controls