Checking the throttle valve

This function is used to test the engine's throttle valve.
Test conditions:
Procedure:
  1. Start the function.
  2. Select specific value that should activate the valve.
  3. A dialogue box shows test conditions, check these and press "Start".
  4. Start and stop the activation for the selected value.
  5. Repeat the procedure for the values to be tested.
  6. At the end of the test press "OK".
  7. The function is done.