These pinouts show precisely the location, color, and function of engine harness wires.
OBD1: 1992-1995
[SPOILER="OBD1 ECU pinouts"]
Pictures courtesy of .:FFS Technet:.[/SPOILER]
OBD2a: 1996-1999
[SPOILER="OBD2a ECU pinouts"]
Pictures courtesy of .:FFS Technet:.[/SPOILER]
OBD2b: 2000-2001*
[SPOILER="OBD2b ECU pinouts"]
Pictures courtesy of .:FFS Technet:.[/SPOILER]
* OBD2b starts in 2000 on the Integra and 1999 on the Civic. OBD2b is a small case ECU.