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CN2 is the connector to the serial port on an OBD1 ECU.

CN2_location.jpg

Here's the pinout of the Dataconnector IN a Honda ECU:

  • 1: GND
  • 2: RX (send Data from the PC to the ECU)
  • 3: +5 Volt
  • 4: TX (send Data from ECU to the PC)
  • 5: N.C. (not connected)

This port is half-duplex (RX and TX are connected) in stock form. See OBD1 J12 for more information about full-duplex modification.

A good pin header for CN2 is digikey part# 640456-4

Question From Web Geek_ "There are 3 search results for that part #, which is the right one?"

For more information see this excellent post by Jim Truett: http://forum.pgmfi.org/viewtopic.php?t=1663

Attachment?: Modify: Size: Date: Who: Comment:
CN2_location.jpg mod 13759 14 Apr 2004 - 00:19 tungsten2k OBD1 CN2 Location

Revision: r1.7 - 31 Oct 2005 - 01:53 GMT - fred { Edit | Attach | History | More }
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