Most Nissan vehicles from this era use a 14-pin gray "Consult" connector located under the dashboard on the driver's side, not the standard OBD2 16-pin port.

Turn the ignition key on with the ECU plugged in. Carefully back-probe the harness. Look for pins outputting a steady, clean 5.0 Volts. These are the reference power lines supplying the TPS and MAP sensors.

Always look for tiny embossed numbers on the plastic corners of the connector housing to verify orientation. Standard Nissan Zexel Pinout Configuration

Typically utilizes three pins (Reference, Signal, and Ground). It informs the ECU of the exact position of the fuel metering sleeve.