Component description for the air pump switchover valve - GF14.30-P-2020V

WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 2012 Mercedes-Benz GL550, 2012 Mercedes-Benz GL450, 2011 Mercedes-Benz ML63, 2011 Mercedes-Benz ML550, and 2011 Mercedes-Benz ML350. However, it is still accessible from the selected car via links, so may be relevant.

ENGINE 272.920 in MODEL 203

ENGINE 272.922 in MODEL 211

ENGINE 272.940 in MODEL 203, 209

ENGINE 272.941 in MODEL 203

ENGINE 272.942 in MODEL 171

ENGINE 272.943 in MODEL 211

ENGINE 272.944 in MODEL 211

ENGINE 272.945 in MODEL 251

ENGINE 272.946 in MODEL 221

ENGINE 272.960 in MODEL 203, 209

ENGINE 272.963 in MODEL 171

ENGINE 272.964 in MODEL 211, 219

ENGINE 272.965 in MODEL 221

ENGINE 272.966 in MODEL 230

ENGINE 272.967 in MODEL 164, 251

ENGINE 272.970 in MODEL 203

ENGINE 272.972 in MODEL 211

ENGINE 272.975 in MODEL 221

ENGINE 273.922 in MODEL 221

ENGINE 273.923 in MODEL 164

ENGINE 273.924 in MODEL 221

ENGINE 273.943 in MODEL 164

ENGINE 273.960 in MODEL 211, 219

ENGINE 273.961 in MODEL 216, 221

ENGINE 273.962 in MODEL 211

ENGINE 273.963 in MODEL 164, 251

ENGINE 273.965 in MODEL 230

ENGINE 273.967 in MODEL 209

ENGINE 273.968 in MODEL 221

Fig 1: Identifying Air Pump Switchover Valve (Secondary Air Injection) - Engine 272.920/940/941

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Location

The air pump switchover valve is located at the front on the right cylinder head.

Task

The air pump switchover valve actuates the aspirator shutoff valve using vacuum from the intake manifold.

Fig 2: Identifying Air Pump Switchover Valve Components - Engine 272.920/940/941

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Identifying Air Pump Switchover Valve Design - Engine 272.920/940/941

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Design

Electromagnetic switchover valve, voltage supply from terminal 87, coil resistance approx. 28 t.

Fig 4: Identifying Air Pump Switchover Valve Function Diagram - Engine 272.920/940/941

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Function

When actuating, the anchor plate (a) is pulled by the solenoid (d) and the sealing rubber (f) closes the aeration. The connection between port 2 and port 3 is opened. Thus there is a vacuum built up from the intake pipe to the aspirator shutoff valves. In the de-energized state the connection between port 1 and port 3 is re-established and air is thus admitted to port 3.