I bought a harness and ecm off of marketplace and were told they were off the same vehicle. The Harness had the Isolated ground O2 sensors with the SQUARE grey connectors. When i scanned the pcm and downloaded the tune it was for an 02 Silverado 2500 with a 6.0 which I though was case grounded. Is there a way to check that the PCM will read the sensors correctly?
