hi, I am having a problem with pontiac trans am 1982 ls swap 6.0 harness change and ECM gen 3, every time I try to write or read it gives me a protocol error which causes 4 ecus doing different tests to run out of information completely I don't know what could be causing this fault, there is voltage and I also put a direct signal from ob2 to the ecm. The same thing happens to me, I thought it could be my mvpi, I went to another car and I was able to read and write calmly, what could be causing this phenomenon? Today or tomorrow I would like to try MDI GM to try to recover the information from the ecus which I want to try but I don't have an access code who could have it available for a couple of hours I am willing to pay for it. My plan is to get them back and tune them on a 2000 pontiac transam that runs great ,I highlight that its original ecu was already tuned at some point
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