i would try pulling the plug off the injector first of all as it may simply be a jammed open injector (i.e not an ecu fault at all).

i'm no expert on this but if the ecu was holding the injector open then it would most likely have fried the injector by now in which case it would be permanently closed.

if it is the ecu and the driver transistor has gone short circuit then a 12 volt bulb across the injector would be permanently lit up.

if the driver transistor in the ecu is the same as an L6 its a BDX53C iirc - available here http://uk.rs-online.com/web/search/s...rchTerm=bdx53c