considier, NOID lamping it before you wreck that Catcon (gas and air will make it glow cherry red)
if the NIOD, is blank, then the transistor ,,Qd
http://carfix.stufftoread.com/ECU/ECU-16v-92w.JPG
check coil resistance (about 12 ohms)
listen for click (compare) with mech. stethoscope. a $3 tool at Harbor Freight.
i may have a typo on my pn , 2SD1415 , see side of transistor for D1415 mark.
it is easy to replace,
just make sure back of replacement is not metal !!!