For a successful "work" or repair on these units, you must identify the three main connector sections: power supply, sensor inputs, and actuator outputs. Core Pinout Designations
Before touching a multimeter, you must identify your specific ECU. Zexel produced several variants. Look for a metallic sticker on the ECU case. nissan zexel ecu pinout work
This system uses a sophisticated 4-plug connector setup. For a successful "work" or repair on these
Modern tuners love to throw these away. But here is why you should care: nissan zexel ecu pinout work