Find a Black/White wire (pin 23 or 103 typically). That is sensor ground. Attach your multimeter black lead there. Then probe other pins with positive lead. Any pin showing 5V or 12V relative to sensor ground is a power supply. Any pin showing continuity to chassis ground (with key off) is likely an actuator return.
Before you chase a sensor code, verify these 5 pins on any Zexel ECU. Find them using a multimeter and a power probe. nissan zexel ecu pinout work
: Manages timing and quantity of fuel delivery. Find a Black/White wire (pin 23 or 103 typically)