Nope..... the only way (which is acceptable to do) is to cut the ECT and ACT wires near the ECM connector leaving space for them to be repaired afterward (this removes the harness possibility out of the picture) and check voltage from the cut wires ECM connector side. Disconnecting the ECT only takes the thermistor (sensor) out of the picture.
I could take the connector apart, pull out those two wires and then reassemble the connector and plug it back in, would that accomplish the same thing?
Again, if the resistance check between ECT and SIGRTN & ground is <10kΩ ... there's a short that needs to be traced.
For clarification, I plug the ECT sensor in, I disconect the eec connector and then check resistance between the ECT pin7 and the SIGRTN pin 46? Should be less than 10k ohms?