two observations

[CTScott]

Originally Posted by Yaris Hilton

I doubt the Yaris has a sensor for the true outside air temperature that a reader like a Scanguage can display. The stock air cleaner takes in air from a point behind the radiator, and the intake air temperature sensor is in the throttle body. It will read the ambient temperature while the engine is warming up, but after the thermostat opens it will be breathing somewhat warmer air.

The thing I really miss from the Volvo I traded in is the data display. But I can't quite bring myself to use a kludgy add-on like a Scangauge. My dad would have. He punched a hole in the dash of his Diesel Chevette and mounted a mechanical tach on top of it.

The ambient temp sensor for the AC is mounted just behind the lower grill. The European Yari with the digital clusters use it for ambient temp display. I use that sensor with my YarGauge and have found it to be very accurate, without significant fluctuations (more than 1 to 2 degrees) when sitting still with the engine running.

On the 06-09 Yari, the sensor's data isn't passed back to the OBD command for ambient temp (it's only available by sending a CAN message to the AC ECU), but on the 2010's it is.