which ls are yout talkin' 'bout? the ls came with a grip of different ecus from different obd versions. the b18a1 came with the p74, p75 or pr4... possibly others, but i'm not sure.
i don't know about the pinouts.
the b18a1 came with both obd0 and obd1 electronic systems depending on which model year car the engine was in.
all this shit is in the ref. section y0.