have a 95 accord ex auto .trans. were having a no fuel pump run when turn on key went to junk yard got a ecm and fuel pump works but know the d4 light don't work so I put in my old ecm and still no d4 light changed main relay and d4 light worked but when the car got hot the ecm would not work so had to put the ecm from the junkyard back in and when I first started it back up the d4 light worked but not for long the d4 light don't come on at all changed out old ecm and main relay with no luck

 

Verify the gear switch on the side of the shifter is clean.