would check feed to coil as a first check , pin 2 the centre one should have 12v to it , I made a loom up so I could check and take the earthing of the coil away from ecu control , if you have feed to pin 2 then check continuity through the coil from pin 2 to 1 and from 2 to 3 , these should both be 0.5 ohms , this is the primary resistance , then check the secondary coil resistance by disconnecting all plug leads and measuring between 1 and 4 then 2 and 3 , both these should be around 10 Kohms , let us know what you find