s300 is plug n play for obd1. for ur case u need to convert to obd1 setup to make it work.but bit more work involved since d16y4 is an aussie version and is abit diff to other obd2 engines.

u cant use hondata obd2 - obd1 conversion harness bcoz d16y4 is different to others.

this link should help u.
http://nzhondas.com/forced-induction...xi-nzdm-2.html