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If you are trying to connect a laptop to your Nissan, you are looking for the Consult Port. Zexel was a primary manufacturer of the diagnostic hardware integrated into these systems.
Location: Usually located to the left of the driver's knee (fuse box area) or near the ECU in the passenger footwell (depending on model: S13, R32, R33, Z32, etc.).
The 14-Pin Pinout:
| Pin Number | Function | Description | | :--- | :--- | :--- | | 1 | RX | Receive Data (Input to Car) | | 2 | TX | Transmit Data (Output from Car) | | 3 | CHK | Check / Init Signal | | 4 | GND | Signal Ground | | 5 | GND | Signal Ground | | 6 | BAT | Battery Power (12V Constant) | | 7 | N/C | Not Connected | | 8 | N/C | Not Connected | | 9 | CLK | Clock Signal | | 10 | N/C | Not Connected | | 11 | N/C | Not Connected | | 12 | N/C | Not Connected | | 13 | N/C | Not Connected | | 14 | N/C | Not Connected |
How to use this:
Always verify the 14-digit Nissan part number on the white sticker before proceeding.
Without a correct pinout diagram, you are essentially blind. Common scenarios requiring the pinout include:
Sam had just inherited an old Nissan 240Z from their uncle — a sleeping beast with a rumpled paint job and a wiring harness full of mystery. The engine turned over but wouldn’t run right. In the garage by noon, Sam found the ECU: a rectangular metal-cased Zexel unit stamped with part numbers and a connector full of pins. No wiring diagram came with the car, and online searches returned a scatter of forum posts. Sam decided to treat the problem like a puzzle and learn the ECU’s pinout.
If you are looking for the pinout of the ECU harness itself (the large plugs going into the computer), the pinout depends entirely on the specific ECU code written on the side of the unit. Zexel printed their name on the casing, but the pinout follows the standard Nissan schematic for that specific model.
How to find the correct ECU Pinout:
| Function | Typical Pin Location (Varies by model) | | :--- | :--- | | Ignition Power (Switched 12V) | Pin 36 (S14/S13), Pin 109 (Some S15) | | Battery Constant (12V) | Often Pin 57 or 66 (Large Red/Black wire) | | Ground (Signal/Power) | Pins 50, 60, 67 (Must be grounded to chassis) |
They also found pins tied to the air flow sensor, idle air control stepper/solenoid, knock sensor, and a tach output to the dash. Some Zexel ECUs have a diagnostic serial or pulse line that flashes check-engine codes using a blinking LED or communicates via a data link:
Sam documented which pins were 5V reference lines (used by many sensors) vs. signal grounds, since mixing those up can cause erratic readings.