I think even the connector is hard to get to. If you have a resistor (variable better) that goes between 50 and about 200 ohms you should be able to "add" some temp and track in INPA or PA soft as engine warms up to see what happens. The wiring is easily accessible in the E-box.
Or like Crowz suggested
you can't be sure that way but from what we already found out if it doesn't work there is a good chance that it won't.