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

ENGINE 272.920 in MODEL 203 up to Model Year 8

ENGINE 272.922 in MODEL 211

ENGINE 272.940 in MODEL 203 up to Model Year 8

ENGINE 272.941 in MODEL 203 up to Model Year 8

ENGINE 272.942 in MODEL 171 up to Model Year 8

ENGINE 272.943 in MODEL 211, 219

ENGINE 272.944 in MODEL 211

ENGINE 272.945 in MODEL 251 up to Model Year 8

ENGINE 272.946 in MODEL 221 up to Model Year 8

ENGINE 272.960 in MODEL 203 up to Model Year 8

ENGINE 272.963 in MODEL 171 up to Model Year 8

ENGINE 272.964 in MODEL 211, 219

ENGINE 272.965 in MODEL 221 up to Model Year 8

ENGINE 272.966 in MODEL 230 up to Model Year 8

ENGINE 272.967 in MODEL 164, 251 up to Model Year 8

ENGINE 272.970 in MODEL 203 up to Model Year 8

ENGINE 272.972 in MODEL 211

ENGINE 272.975 in MODEL 221 up to Model Year 8

ENGINE 273.922 in MODEL 221 up to Model Year 8

ENGINE 273.923 in MODEL 164 up to Model Year 8

ENGINE 273.924 in MODEL 221 up to Model Year 8

ENGINE 273.960 in MODEL 211, 219

ENGINE 273.961 in MODEL 216, 221 up to Model Year 8

ENGINE 273.962 in MODEL 211

ENGINE 273.963 in MODEL 164, 251 up to Model Year 8

ENGINE 273.965 in MODEL 230 up to Model Year 8

ENGINE 273.967 in MODEL 209

ENGINE 273.968 in MODEL 221 up to Model Year 8

ENGINE 272.940 in MODEL 209

ENGINE 272.960 in MODEL 209

Shown on ENGINE 272

Fig 1: Electric Air Pump Flow Diagram

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: Electric Air Pump Design

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.