Im helping my friend with his lt1 swap into his 91 z28 and the harness that came with his lt1 didnt come with the aldl port like he requested so we had to go to a junk yard and get one. connector c220 has a serial data pin on it but there is 4 wires coming off of the aldl port and i cant find any other pinouts for the aldl port. I dont want to go rip my dash out of my 94 and figure it out. Can anyone help me out and maby post a diagram or something? He wants it in so we can tune with tuner cats instad of having to swap his pcm into my 94 and have me tune it everytime we want to change something.

 

Here goes:
Pin B (WHT/BLK) is your field service enable (D20 @ the PCM)
Pin A (BLK) is your ground
Pin M (TAN) is your serial data line (D30 @ the PCM)
Pin G (BLK/WHT) goes to the keyless entry (this is not needed)

You will be looking at the Blue terminal of the computer harness. I would recommend that you use as few splice points as possible. The resistance could cause some connectivity issues when you are trying to scan.

 

thanks man. you have been the biggest help through this whole process