Electric air pump. description of components - GF14.30-P-2000V

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

Shown on ENGINE 272

Fig 1: Identifying Electric Air Pump Components - Shown On Engine 272

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Location

The air pump is located upstream of the intake manifold.

Task

The electrical air pump pumps the injected air to the exhaust side of the engine.

Design

Electrically operated vane-type pump. The injected air is drawn from the air filter (clean air side) and driven via two pressure connections via the air shutoff valves to the outlet ducts.

Fig 2: Electrical Air Pump Function Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Function

The electric air pump is actuated when air injection is enabled via the air injection relay at the same time as the air pump switchover valve for a maximum of 40 seconds. Its power consumption at 13 V is approx. 45 A.

This draws the injected air from the air filter (clean air side) an and drives this via two pressure connections via the air shutoff valves to the outlet ducts. If the air pump runs for longer than around 4 minutes, for example due to an incorrect actuation, it will be damaged.

Following actuation, air injection remains locked. A new enable of the air injection will only take place if the catalytic convertors cool down again due to a sufficiently long stoppage of the engine. The electrical air pump thus has sufficient time to cool down again.

Air injection may be actuated deliberately using STAR DIAGNOSIS for a maximum of 2 minutes. Prior to the next actuation, it is essential to maintain a cooling time of 30 minutes, otherwise the air pump may be damaged.