Please consult golo technician box to check the position of the old Corolla throttle sensor, why it shows zero, and how to check the throttle opening?

First of all, you have to get into the right car, and then turn on the switch until the instrument light is on, so that you can check it.

When it is not started, you should see 0 degrees. When starting at idle speed, the throttle opening should be about 5 degrees. Then you refuel and see if the throttle opening increases with the increase of the throttle. That's all.