I got a ecu of some guy n he said its a p28 but it don't have da sticker on da side so how do I check if its a p28 with out plugging it to my eg

 

ill elaborate on your title.

 

To tell if it a P28 check if it is first check if the connector on the bottom is ODB1
next you will have to open up the ecu it should look similar to this
http://www.xenocron.com/install/ECU-...s/image004.jpg

also take note of the serials inside the ecu usually top left corner
and this will state what it is

92-5 ECUs (P28, P30, P61, P72, P91, P08)
5spd = 000, 001, 002, 003, A00, A01, A02, C00, C01, C02, J00, J01, J02
Auto = J50, J51, 901, 902, C50, C51, C52, A50, A51, A52


From the patterns we can learn the following:
-First letter = country of orgin
J = Japan
C= Canada
A=USA

-Second digit, if 5, 7, 9 then ecu is auto usually

-Third digit denotes the version/variation

Hope this helps

 

and on the sticker that is over where the wiring harness plugs in they usually have the code right in the middle of it