Do you have a scan tool that can monitor the live data? If so, I attached a test that will simplify this. Have you already replaced the ECT sensor?
Let me know what you find with this but clearly if the temp gauge doesn't move, I suspect it is reading -40. If this is the case then that is an open circuit on the ECT. It is either the sensor or the wiring, or the PCM.
Let me know what questions you have or what you find. Thanks
Images (Click to enlarge)
Sunday, March 8th, 2020 AT 3:21 PM