While manufacturers lock complete wiring diagrams behind expensive paywalls, there is basic ECU identification data available for free if you know where to look.
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The YD25 engine uses several ECU variations depending on the year (Type 1 vs. Type 2). The ECU is generally located in the engine room on the passenger side, behind the coolant reservoir. Wire Color Signal Name / Function ECM Ground Always grounded Fuel Injector Power (Cyl 1 & 3) ~7.5V at idle Fuel Injector Power (Cyl 2 & 4) ~8.0V at idle Orange (OR) EGR Volume Control Valve Battery voltage (11-14V) Engine Coolant Temp Sensor Variable signal Accelerator Pedal Position Sensor input Crankshaft Position Sensor Speed/Timing signal Key Resources & Full Diagrams yd25 ecu pinout free
Detailed diagrams often categorize pins by their specific sensor or actuator function. Below are common reference values and pin assignments found in technical documentation for the YD25: Sensors (5.0V Power Supply) : Throttle Position Sensor power supply. : Camshaft Position Sensor power supply. : Fuel Rail Pressure Sensor power supply. : Turbocharger Boost Sensor power supply. Signal Monitoring (Engine Running) Type 2)