I was recording some runs and my ECE value was flicking between the actual value 94 degrees C and -12 degrees C.
The temp gauge in the vehicle read a constant value around 94 degrees. I connected a scan tool (J-Scan) and got a constant value in that also of 94 degrees C.
I then did another log with HP and the temp value stayed at -12. I thought this must be a broken wire somewhere because it was intermittent but I don't understand why the scan tool didn't get the same values as HP. I thought the scan tool read off the PCM which read off the temp sensor on the engine. Any ideas where to start looking?