The ME limiting maximum vehicle speed function - GF07.61-P-3007V

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 272.963 in Model 171

Fig 1: ME Limiting Maximum Vehicle Speed Function Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The ME control unit detects the engine speed via the crankshaft Hall sensor signal. As a protection for the engine and the drive train, engine speed is limited by retarding the ignition timing and switching off the fuel injection valves if the following conditions exist:

Transmission overload protection
1. Torque converter protection of automatic transmission
  In order to protect the torque converter in selector lever positions P and N (no power flow) from excessive static internal pressure, engine speed is limited to approx. 4200 RPM.
2. Mechanical transmission (no gear engaged)
  In order to avoid damage to the transmission engine speed is limited to approx. 4000 RPM.

2nd Limiting maximum engine speed when driving

In order to protect the engine from the consequences of impermissibly high revs, engine speed is limited to 6000 RPM. The driving mode is detected from the vehicle speed signal.

3rd Throttle valve actuator defective

If the throttle valve actuator is faulty, the engine speed in neutral is restricted to approx. 1400 RPM and in driving mode to approx. 1800 RPM.

Component description for the ME-SFI [ME] control unit	GF07.61-P-6000V
Component description for the crankshaft Hall sensor	GF07.04-P-6220V
ME-SFI safety fuel shutoff function	GF07.61-P-3018V
Component description for the throttle valve actuator	GF30.20-P-2020V