This information is based on the two distinct ECM types used in . It’s the most common source of confusion, so identifying your vehicle’s type is step one:
The Nissan YD25 typically uses a multi-connector ECU (often labelled M90, M91, etc., depending on the service manual). The main ECU connectors are usually grouped by function—engine sensors, fuel system, and emissions control.
Commonly found on pre-facelift D22 and D40 Navara models. These often feature a three-plug or four-plug configuration.
Before downloading any pinout, you must identify your ECU. Nissan used two primary Bosch systems on YD25 engines. yd25 ecu pinout free
The YD25 engine uses highly sensitive, high-voltage solenoid injectors. Never back-probe these pins while the engine is running due to dangerous voltage spikes up to Pin 111 (Injector Cylinder 1 High): Yellow / Black Pin 112 (Injector Cylinder 1 Low): Blue / White Pin 113 (Injector Cylinder 2 High): Green / Yellow Pin 114 (Injector Cylinder 2 Low): Red / Black Pin 115 (Injector Cylinder 3 High): Pink Pin 116 (Injector Cylinder 3 Low): White Pin 117 (Injector Cylinder 4 High): Light Green Pin 118 (Injector Cylinder 4 Low): Grey / Red Critical Voltage and Resistance Testing Values
YD25 ECU Pinout Blueprint (Standard Denso 3-Plug / 4-Plug Reference)
Always disconnect the negative battery terminal before removing or plugging in the ECU harness connectors to prevent voltage spikes. This information is based on the two distinct
Nissan is fairly consistent with wire colors (e.g., Black is almost always Ground), but never rely on color alone. Use a digital multimeter to check for continuity.
Supplies continuous memory power to the ECU.
Below is a general guide to get you started. Commonly found on pre-facelift D22 and D40 Navara models
Before testing pins, you must identify your specific ECU variant. The wiring configurations differ significantly between models:
Check voltage at the SCV pins (106/107). A faulty Fuel Pressure Regulator usually shows incorrect duty cycle voltage.
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