Hello. Im new here. I already made a search but didnt find an answer to my question. I have a 94 accord auto, and the D4 light on the dash board is flashing. Also the CEL light stays on. I would like to know how do I pull the codes from the ECM, where is the obd plug located? Thanks!

 

does your speedo work? if not ,it is the speed sensor

 

The plug is located below the glove compartment closest to the door. It is a two wire plug, and should have a blue connector with rubber cap over it. Pull the plug down and use a paper clip or wire to jump the two wires together. Then just turn the key foward so the accessories turn on. If the wires made contact correctly, the CEL will flash a series of codes corresponding to your problem(s). After you solve/fix the problem, disconnect the battery for about 1 min. (to be safe) so that the ECM will reset itself. You can also remove two fuses inside the fuse box in the engine compartment, on the passenger side. Remove the ECM and Back-up fuses for about 1 min.

 

Thnak you very much guys. Very helpful.