Ambient temperature sensor OBD-II data

[IllusionX]

Originally Posted by CTScott

So does the Yaris. I display the ambient temperature on my YarGauge (homemade diagnostic tool), but you have to talk to the AC ECU to get the data, rather than to the ECM (so it is not a standard OBDII PID, but rather a manufacturer specific diagnostic PID).

Does that mean Toyota uses the same sensor, and get the info from the AC ECU in some cars?

[CTScott]

Originally Posted by IllusionX

Does that mean Toyota uses the same sensor, and get the info from the AC ECU in some cars?

Yes. But, some (including the 2010+ Yaris) pass that data to the ECM, so that it can report it with a standard OBDII PID.