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:
Battery voltage above 20 V.
Parking brake applied.
Engine off, ignition on.
Procedure:
Start the function.
Press "OK".
Use the buttons to start and stop the test.
Press "OK".
The function is done.
If the function fails, check the test conditions and repair any faults.