TS and CG Terminal Circuit: Description
WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.
In sensor check mode, malfunctions of the speed sensor that cannot be detected when the vehicle is stopped can be detected by driving the vehicle.
Transition to sensor check mode can be performed by connecting terminals TS and CG of the DLC3 and turning the ignition switch from OFF to ON.