Has it been calibrated?

 

Calibrated? How do I do that?

 

 

I'm no expert on your model but it looks like the red wire and yellow wire have been reversed, assuming the wiring diagram shows the correct layout. However, they may be that way round because of the wiring in the STV, like I said I'm no expert.

 

And your question is?

 

Your plug wiring is correct. If your sensor is reading backwards, you are either testing wrong, or have the wrong sensor.