If you are deep into the vintage Nissan game—specifically the S13, R32, Z32, or P10 era—you have likely heard the name ZEXEL muttered in the same breath as "standalone conversion" or "wiring nightmare."
Fuel Quantity Actuator: The high-current output that physically moves the rack inside the Zexel pump.
The small gauge wires from the ECU to the injection pump (pins 5 & 6) are notorious for chafing on the engine block. Symptoms: Intermittent stalling, no-start when hot. Fix: Run a new shielded twisted pair from ECU to pump. nissan zexel ecu pinout work
What is the Nissan ZEXEL ECU?
| Pin | Wire Color | Signal Name | Function | Typical Voltage/Behavior | |------|------------|----------------|------------------------------------------|----------------------------| | 1 | Black/Yellow | EGR Solenoid | EGR control (ground switched) | 0V or 12V | | 2 | Red/Black | TPS Signal | Throttle position sensor (main) | 0.5V (idle) – 4.5V (WOT) | | 3 | Green/White | TPS Ground | Sensor ground reference | 0V | | 4 | Brown | Fuel Temp Sensor | In-pump fuel temperature | 2.5V @ 20°C | | 5 | Yellow/Red | Spill Valve (+) | Injection pump timing control | PWM ~90-200Hz | | 6 | Black | Spill Valve (-) | Return path for spill valve | PWM ground | | 7 | White | Vehicle Speed Sensor (VSS) | Speed signal from gearbox | AC sine wave or 5V square | | 8 | Blue/Red | Neutral Switch | Manual transmission neutral | 12V in gear, 0V in neutral | | 9 | Light Green | ACC Signal | Ignition switch accessory | 12V key ON | | 10 | Black/White | ECU Ground (Power) | Main ground for drivers | <0.1V drop | Decoding the Brain of a Legend: A Deep
The symptoms you're trying to fix (e.g., no start, limp mode)
This system uses a sophisticated 4-plug connector setup. Symptoms: Intermittent stalling, no-start when hot
What is a Zexel ECU?
Before you chase a sensor code, verify these 5 pins on any Zexel ECU. Find them using a multimeter and a power probe.