you are looking for the diagnostics socket, on a normal ep82 it sits on the rear right of the engine bay and has a plastic cap over it.
to put the ecu into diag mode you first using a paper clip or similar have to bridge out the TE1 and T1 connections as shown in the above pic.
then turn the ignition on,
don't start the engine. if there is a fault the ecu light flashes a number of times that will correspond to a fault code listed above
eg
3 flashes,
pause 1 flash would indicator a MAP sensor fault.
hope that helps, it is explained better in the picture above.