Test of back pressure device

This function is a test and is used to check the vehicle back pressure device, by activating and control the device's PWM valve. The back pressure device's throttle arm will move and a characteristic sound will occur.
Note:
If the test is activated for more than 60 seconds, it stops automatically.
Test conditions:
Procedure:
  1. Start the function.
  2. Press "OK".
  3. Use the buttons to start and stop the test.
  4. Press "OK".
  5. The function is done.