DDEC IV Boost Sensor Problem

Truck is an '02 Columbia with a 12.7 60 series Detroit pre egr. Had ecm replaced with a used one after Detroit programmed it it was throwing flash code #34 for low turbo boost sensor voltage. The old ecm was displaying this code as well. I replaced boost sensor with a new one and it is still displaying the code. I unplugged sensor ,turned switch on, and used the test light to confirm I had power going to it. Of the three wires going to it only is hot. I assume one is the power coming in, one is the return going to ecm and the last one is the ground. Any answer as to why it is still displaying the code? Thanks in advance for your response.