im looking for a p28 so i can get my sedan running again. i was wondering how do you tell if the ecu is for an auto or a 5speed. i searched and couldnt find anything. i remember a while back i was told you can tell by looking at the code on the side. but i forget what the code for the 5pd is. thanks in advance.

 

here ya go

https://honda-tech.com/zerothread?id=810101

 

cliffs notes:
37820-P28-Xxx
0=manual trans
5=auto

all though auto to manual conversion are really easy and common these days.
open case, look at lower right side where chip usually sits, check just below the chip location for RP17 and RP18. If there is are resistors in RP17 and RP18 then it's an auto trans, if there is no resistor in RP17 and a wire or zero ohm in RP18 then it's a manual trans.