Automotive instructor

[Mcstevieb]

Hello group. I am helping a friend on his Manta Mirage. I know it has a late 1980’s TPI Chevy motor. I tried hooking up my diagnostic computer to the ALDL connector and I’m not getting any data. Does anybody know where the cars computer is located? Second is there a check engine light that should be on the dashboard or is there a light that’s on the computer that will flash when it’s grounded out the tell me what codes are there? Please advise.
Thank you for your help