so disconnect the ecu, isconnect the bad coil clip, and use the pinout diagram and a multimeter on the contnuity setting to get a simple answer of wether or not the cables get to the other end or not. with ecu and battery off, you can poke wherever you want and cant hurt anything.
check that one pin goes to ground, one goes to the battery, and the other will be the trigger for example if there are 3.
use a bit of speaker wire or something to go up from the ecu to one of the pins, and then find the other end on the ecu.