Re: Blinking D4 Light on 97 Accord EX (sl0wED)
I do not know as much about automatics, but I know that the D4 light blinks when there is a problem with the transmission. If the TCU or ECU is bad, then it could cause the light to blink as well. Try searching for methods of how to trouble shoot the TCU and ECU. If you get a repair manual, it should give you some steps to troubleshoot these as well.