I have this client who owns two e6x ecus, one of them started having comm problems until it just wouldnt communicate (this happened in some months time), so we used the other ecu and now this one has the same problem... (again, it was fine for a while and then acted up).
My question is why would could ecus be having comm problems? Im sure it cant be my laptop or comm serial cable because just before this car I tuned a E8 equipped subaru.
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Do a continuity check from the DB9 plug to the ECU harness plug. There's only 3 wires used on the DB9 plug, 2,3, and 5 if I remember. I think they go to something like pins 8.9, and 26 on the Haltech harness respectively. I was having the same problem and was able to trace it down to a broken wire. Those serial cable wires are TINY! Spliced in a new DB9 plug for $6 and was able to communicate again.
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