In USA that lamp is labeled 'check engine'. Search for that, or CEL, or 'error codes'.

I don't know for '88, but one of 2 ways to do this. You either have a flashing light on your ECM; or you find a wiring plug & jumper it & watch the PGM-FI lamp blink. Maybe someone with an '88 can say which way...

It blinks a code of long flashes (=10) & short flashes (=1). So long-short-short would be fault code 12. Whatever code you get, either look it up in a repair manual or post back here & ask us.