Honda CN2 port pinout

Pinout of CN2 port:

Honda`s ECU Pin Pin
2 RX send Data from the PC to the ECU
3 +5V
4 TX send Data from ECU to the PC
5 NC Not connected

This port is half-duplex (RX and TX are connected) in stock form. When it’s chipped and modified, it uses 10 bits at 38400 baud-rate.

Sign Up to get updates on the latest article

Get the latest from my blog when you sign up.  Special offers are only offered to those who sign up.  Specific DIY are emailed to users when they become available.  Sign up today to get notified.

3 thoughts on “Honda CN2 port pinout

  1. Paul,
    If I decide to use a max r232 (Serial to TTL) for Arduino + a USB to serial cable connected in order that you describes. This can work for data logging with Freelog?

    Thank you!

  2. Yes. Give it a try and let me know. I was going to work on a project to do just that. I’m going to log the data and display it on my gauges. That’s my next project. Right now I’m working on a cheap affordable chip programmer for the community.

  3. I just reread your post and all you need is just the ttl to cmos converter with a sub interface for free log to work. You don’t need the Arduino if free log is used since it will be data logged on the laptop.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.