ME tumble flap switchover function - GF07.61-P-4017V

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: ME Tumble Flap Switchover Function Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

At partial load, tumble flaps can be fully swung out in each cylinder intake port in the intake manifold. This closes the intake manifold by around 50%. The flow speed of the intake air is increased and allows for improved distribution of the fuel/air mixture in the combustion chamber.

The tumble flaps are moved via an aneroid capsule and a rod to the flap shafts.

The intake manifold tumble flap switchover valve is integrated in the vacuum line to the aneroid capsule. If it is de-energized, the aneroid capsule is ventilated and the tumble flaps are lowered in the intake duct (closed position).

If the intake manifold tumble flap switchover valve is actuated by a ground signal from the ME control unit, vacuum pressure from the intake manifold enters the aneroid capsules. The tumble flaps turn in the intake duct.

Actuation is enabled under the following conditions:

Engine speed less than about 3000 RPM (e.g. engine 272.963)
in neutral for variants VC5 and VC6 (on neutral locked from variants VC7)
Engine load less than approx. 30%.
Coolant temperature greater than 60°C

The mechanical end position of all tumble flap shafts are monitored by a position sensor. For diagnosis, following engine start, the tumble flap switchover is actuated briefly to test the actuation and achievement of the end positions.

Read out the variants using STAR DIAGNOSIS under the menu item "Control unit version".

Component description for the ME-SFI [ME] control unit	GF07.61-P-6000V
Component description for the position sensor tumble flap	GF07.04-P-6230V
Component description for the intake manifold tumble flap switchover valve component description	GF07.05-P-6030V
Component description for the crankshaft Hall sensor	GF07.04-P-6220V
Component description for the hot film MAF sensor	GF07.07-P-6000V
Component description for the coolant temperature sensor	GF07.04-P-6040V
Component description for the intake manifold	GF09.20-P-6010V