Please note: This system is only available on turbocharged engines.
General information
1. The engine overload protection system is designed to limit engine power in the event of a malfunction in the turbocharger pressure regulator. The pressure switch, located on the intake manifold, monitors the pressure and is triggered when the pressure exceeds the set value. It interrupts the operation of the electromagnetic valve, which in turn cuts off the vacuum from the diaphragm located on the high-pressure fuel pump. As a result, the fuel supply from the pump immediately decreases and becomes the same as without turbocharging.
2. The serviceable parts are only the pressure switch and vacuum solenoid valve.
Pressure switch
Removal
3. The pressure switch is located on the wall of the common chamber of the intake manifold, next to the washer fluid reservoir.
[Original published on the website: MercedesMan.ru]
4. Disconnect the switch wires from the connector.
5. Unscrew the switch from the manifold and remove the sealing gasket.
Installation
6. Installation is carried out in the reverse order of removal.
Vacuum solenoid valve
Removal
7. The vacuum solenoid valve is located in the rear of the engine compartment on the left side behind the false panel partition.
8. Disconnect the switch wires from the connector.
9. Disconnect the vacuum hoses from the vacuum valve fittings - record the position of each hose to avoid confusion during installation.
10. Loosen the mounting screws and remove the solenoid valve.
Installation
11. Installation is performed in the reverse order of removal. Make sure that the vacuum hoses are connected correctly, otherwise serious engine damage may occur.