To test inputs while the engine runs, use a thin backprobe needle inserted into the rear of the wire harness connector. Do not pierce the wire insulation, as this introduces moisture and eventual copper corrosion. Common Troubleshooting Scenarios No Communication / No Start
Zexel corporation, originally a Japanese manufacturer closely tied to Bosch, produced fuel injection systems and electronic control units for various automotive brands. In Nissan vehicles, Zexel modules are predominantly found in two configurations:
| 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 | nissan zexel ecu pinout
High-amperage lines that demand thick-gauge wiring. 3. Primary Sensor Inputs
Understanding the is essential for diagnosing engine issues, performing performance tuning, or bypassing immobilizer systems on classic Nissan diesel models. Zexel ECUs are sophisticated fuel injection control units primarily used in diesel engines to optimize performance, fuel efficiency, and emissions. Overview of Zexel ECUs in Nissan Vehicles To test inputs while the engine runs, use
The Nissan Zexel ECU pinout includes various signals and functions, such as:
ECU-controlled ground output to trigger the main power relay. Green/Yellow Dedicated clean ground path isolated from chassis noise. Black or Blue/Black Chassis Ground In Nissan vehicles, Zexel modules are predominantly found
Controlling electronic fuel injection pumps (such as the Zexel Covor/VP series) on engines like the TD27, QD32, and RD28.
This is a frequent issue on electronic Zexel diesel injection pumps (like the Bosch VP37 licensed variants). Inspect the pins on the ECU.
A pulse-width modulated (PWM) solenoid valve that alters internal pump pressure to advance or retard injection timing.