Insert thin T-pins into the back of the harness connector where the wire enters the plastic housing. Shoving multimeter leads directly into the female front pins will stretch the metal terminals, resulting in permanent loose connections and intermittent misfires.
| Nissan Model | Engine | Zexel ECU Part Numbers | | :--- | :--- | :--- | | | ZD30DDTi | 23710-VD202, 23710-VD21A, 23710 VD20A, 407917-144 0 | | Navara D22 | 2.5L Di | 407917-072 (also 23710 VK563), 23710 VK562 | | Primera P11 | CD20T | 23710-2J615, 23710-2J610 (both often paired with Zexel 407913-111) | | Terrano | 2.7L, 3.0L | 407913-120 3, 407917-076, 23710-2X901 |
Tells the ECU exactly how much fuel the pump is physically ready to inject.
A thermistor circuit that alters voltage output based on engine heat, controlling cold-start fuel enrichment and glow plug duration. nissan zexel ecu pinout
Manages exhaust gas recirculation for emissions control.
The following pin assignments have been documented for this specific ECU (23710-2J610/407913-111) found in the Nissan Primera P11 CD20T diesel:
Here's a general overview of the pinout sections: Insert thin T-pins into the back of the
Fuel cut solenoid (E18 Pin 5 – Blue wire). Test: With key ON, check for 12V between E18 Pin 5 and chassis ground. If no voltage, trace back to the main relay (E18 Pin 1 – Black/White). If the main relay clicks but no 12V, replace the relay. If E18 Pin 5 has 12V but the engine won’t start, the solenoid itself is mechanically stuck.
Triggers the check engine light on the dashboard.
The Engine Control Unit (ECU) is the brain of your vehicle's powertrain. In many older Nissan diesel and gasoline vehicles, units manufactured by Zexel (often in partnership with Bosch) handle this critical task. A thermistor circuit that alters voltage output based
Special pins may need to be grounded or connected through a resistor (e.g., ) to put the ECU into a "read/write" state for tuning. Identification and Troubleshooting Always identify your ECU by its part number 407913-1234
The fuel cut solenoid requires a clean 12V ignition source. For safety, route this through a crash inertia switch or fuse it tightly so it cuts fuel immediately when the key is turned off. Troubleshooting Common Zexel ECU Problems
| Pin | Wire Color | Signal Name | Description | | :--- | :--- | :--- | :--- | | 1 | R (Red) | Battery +12V (Direct) | Main power supply for injector drivers | | 2 | B (Black) | Ground (Engine block) | Heavy ground for output drivers | | 3 | B/R (Black/Red) | Ignition Relay Output | 12V switched after main relay | | 4 | – | Not Used | — | | 5 | Y (Yellow) | Starter Signal (ST) | 12V while cranking | | 6 – 14 | Various | Reserved for ABS/TCS signals on automatic models | Refer to vehicle-specific supplement |