If you're not comfortable with DIY electronics or if your project requires precise and reliable data, consider consulting with a professional automotive electrician or a tuning specialist.
Because no two Zexel part numbers (e.g., 23710-60J00 vs 23710-60J05) share identical pinouts, you must reverse-engineer yours. Do this:
These are the first pins to check if the ECU is dead (No Check Engine Light).
| Pin # | Function | Wire Color (Typical) | Description | | :--- | :--- | :--- | :--- | | 1 | Battery +12V | White/Red | Constant power from battery (fused). | | 2 | Ignition Switch | Black/White | +12V when key is ON. | | 3 | ECU Ground | Black | Main ground to chassis/engine. | | 4 | Sensor Ground | Black/Yellow | Ground return for TPS and sensors. | | 50-54 | System Ground | Black | Additional grounds for injectors/solenoids. | nissan zexel ecu pinout work
Before attempting to read pinouts, the technician must verify the ECU manufacturer. Nissan ECUs are typically identified by a metal label on the case exterior.
2.1 Manufacturer Markings
2.2 Physical Connectors Zexel ECUs typically utilize one of two connector configurations: If you're not comfortable with DIY electronics or
Not every Nissan from this era used ZEXEL. You typically find these boxes in:
If your ECU case is metal, has a large sticker saying "ZEXEL" or "Diesel Kiki" (their old name), and smells like 1989, you have found one.
Zexel ECUs are sensitive to ground offset. If you see >0.2V between pin 10 and battery negative, the engine harness main ground is failing. Fix: Add a dedicated 10-gauge ground wire from ECU case to engine block. If your ECU case is metal, has a
Q: Can I use a Zexel ECU from an automatic transmission on a manual? A: Yes, but you must either ground the “auto/manual” pin (usually pin 32 – idle-up logic) or reprogram the ECU. Failure to do so causes erratic idle.
Q: What happens if I reverse the spill valve wires (Pins 5 & 6)? A: The injection timing will go to maximum retard. The engine may start but will smoke heavily and lack power. Don’t do it.
Q: My pinout diagram shows a wire color that doesn’t match my harness. Why? A: Nissan changed wire colors across production years. Trust the pin number, not the color. Use a continuity tester to verify.