94 Accord. Where is the ECU diagnostic plug???

Well, browsing the manual, the only diagnostic plug I could find is under/behind the glove box for both the LHD and the RHD cars. This SCS (Service Check Connector) seems to perform troubleshooting for both the Engine Control Module and the ABS Control Module. Once the SCS is jumpered, the diagnostic code will flash on the instrument panel. The check engine light will flash it's code, and the ABS light will flash its code. Hope this helps. If still confused maybe offer more information about your question.

. wrote in news: snipped-for-privacy@4ax.com:

There isn't one. Unless you mean the "Service Check Connector" for the Check Engine light. For that, click here:

'Curly'

Pull out the ashtray...right behind that you should find it..

This is probably true for the '96 and '97, as well as the '95 V6 which all use OBD-II. But for other 5th-gen Accords (which use OBD-I), the connector should be under the dash behind the passenger side foot well.