EVO3gsr,
The stock ecu have 3 plugs. There are 26P, 16P and 22P.
Those don't have dignostic tool, follow this:
You need one led and resistor ( 1K ohm )
Connect one end resistor on 16P.12 ( wire face to you )
(16P.12, lower row at four column )
1...2...3...4....5...6...7...8
9..10..11..12..13........16
then connect the other end with led.( one leg on resistor, one led on led )
then connect the other end led on ground.
Turn on the ign switch. The led should blink. ( if not blink, please reverse the led legs )
If the led blink constantly, you are safe.
Otherswise, it will blink on "CODE"
Sorry for my language, hope you understand.
Good Luck