1995 Blazer...new trans. Shifts hard into drive when cold and 1-2 shifts are hard. No codes but anomally I see is in transmission tables with snap on ethos scanner that tps is not available, but if I view engine side tps is solid throughout range and voltage is good. Hence tranny does not see tps info and shifts at 100 pressure. Tried swapping ecm no change. Assuming harness issue. But big problem is where. Inside tranny or from tranny to ecm?