Hi, i just pulled apart my ECU for the firs time to replace the memcal! and came across this! i knew someone before me was dodgy with wiring but not this dodgy! he has linked the two black wires together and a 3rd wire connected that isnt going anywhere! (the green one) now my guess was that one off those black wires was a faulty ground so he linked the other one to it to fix the faulty ground assuming that they are both grounds! thats just my guess! but the engine runs fine and has done for ages! just need someone els's opinion on what this is about! cheers!