Consult Port Wiring
When I first began this project, I installed a ECU from a 1996 200SX SE-R into my B15. Older ECU’s have an interface, commonly called the consult port. If you are using the B15 to B14 wiring diagram posted here to do your conversion, you will still be able to use your cars OBDII port to read an clear ECU codes. The consult port provides much more information and in some cases can be used to program certain parts of the ECU (with the proper consult device). Since I was going to be using Nissan Datascan for monitoring and data logging, I needed to install the consult port.
Initially I set out hoping to wire the consult wires from the ECU directly to a USB cable. My thought was that I would strictly be using a laptop for interfacing with my ECU, so why would I need the actual consult port? My mind was changed when a friend was helping me out one day and told me that his Snap-On diagnostic scanner could interface with my ECU as long as I had the actual consult connector. That got me thinking, what if I needed someone else to read/program information on my ECU? Without the consult connector, no one would be able to do that unless they happened to have a laptop with the proper software. When I ordered my consult to USB cable from Blazt, I also ordered the female side of the consult connector. It was an extra $10 added to my order that would ensure that any consult device could interface with my ECU.
With that out of the way, here is what you will need to install a consult port with your B15 to B14 ECU conversion:
- Female consult connector with pins
- Wire (multiple colors is best)
- The usual soldering supplies (Iron, solder, shrink-wrap, etc)
If you do not already have the needed components to connect your computer to your ECU, below are the list of parts and software I am using. There may be other options out there, but these are the parts I choose to use.
- Consult to USB cable
- Nissan Data Scan
- Data Log Viewer
Alternatively, you can purchase all of these as a package from Blazt.
Now that you have everything, you need to know how to connect the consult plug to the ECU. First we will identify the names of the pins on the female consult connector. Below is an image courtesy of ECU Talk that displays this very well.
The hard part is figuring out what ECU pin each pin on the consult port connects into. Luckily I have documented that information below to make things easier.
| Consult Pin | ECU Pin |
|---|---|
| RX | 64 |
| TX | 65 |
| CLK | 68 |
| GND | 10 or 11 |
| Power | 56 |
All you have to do is solder the corresponding consult pins to the correct ECU pins and you are all set!
I encourage you to double-check all wiring and ECU pin-outs. This pin-out worked on a 1996 SE-R ECU, but I cannot guarantee that it will work on other ECUs. You may also choose to pull power and ground from different locations. For simplicity I choose to run everything to the ECU.