Nissan Zexel Ecu Pinout _hot_ -

The Nissan Zexel ECU (Engine Control Unit) is a critical management system found in various Nissan diesel vehicles, most notably the Nissan Patrol Y61 and Navara D22 equipped with engines like the ZD30, YD25, and TD27. Zexel, originally Diesel Kiki and now part of the Denso Corporation, produced these ECUs to precisely control rotary fuel injection pumps (such as the VP44) and optimize engine performance. Understanding the Zexel ECU Pinout

Why the Pinout Matters

The Zexel ECU is not a "plug-and-play" unit. It relies on a complex network of sensors:

Compatibility: Because Zexel ECUs vary by year and region, it is essential to identify the Manufacturer P/N (e.g., 407917-xxx) or the Nissan Part Number (e.g., 23710-xxxxx) before attempting a pinout swap. nissan zexel ecu pinout

| Pin Number | Function | Description | | :--- | :--- | :--- | | 1 | RX | Receive Data (Input to Car) | | 2 | TX | Transmit Data (Output from Car) | | 3 | CHK | Check / Init Signal | | 4 | GND | Signal Ground | | 5 | GND | Signal Ground | | 6 | BAT | Battery Power (12V Constant) | | 7 | N/C | Not Connected | | 8 | N/C | Not Connected | | 9 | CLK | Clock Signal | | 10 | N/C | Not Connected | | 11 | N/C | Not Connected | | 12 | N/C | Not Connected | | 13 | N/C | Not Connected | | 14 | N/C | Not Connected |

Zexel was a fuel injection manufacturer (now part of Bosch). Their "ECU" is usually a small black box mounted on or near the injection pump, not the main engine computer. The Nissan Zexel ECU (Engine Control Unit) is

Fuel Injection Management: The ECU uses real-time data from sensors (like the oxygen, crankshaft, and temperature sensors) to adjust fuel quantity and injection timing.

⚠️ CRITICAL WARNING: Never assume your pinout matches 100%. Always back-probe or use a factory wiring diagram for your chassis number. The table below is a generalized reference for the most common setup. It relies on a complex network of sensors:

| Pin # | Signal Name | Description | | --- | --- | --- | | 1 | O2S | Oxygen sensor | | 2 | O2H | Oxygen sensor heater | | 3 | EGR | Exhaust gas recirculation valve | | 4 | PCV | Positive crankcase ventilation valve | | 5 | FLC | Fuel level sensor | | 6 | VSS | Vehicle speed sensor | | 7 | NSS | Neutral/park switch | | 8 | WLS | Wide open throttle switch | | 9 | ASL | Air conditioning switch | | 10 | FAN | Cooling fan control | | 11 | INJ | Fuel injector signal | | 12 | IGT | Ignition timing signal | | 13 | ST | Starter signal | | 14 | IGN | Ignition switch | | 15 | BAT | Battery voltage | | 16 | GND | Ground |