Component description for crankshaft Hall sensor - GF07.04-P-6220V

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

Location

The crankshaft Hall sensor is located behind the left cylinder bank.

Fig 1: Identifying Crankshaft Hall Sensor Components - Engine 272.920/940/941/960/970

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Task

It detects the engine speed and the crankshaft position by scanning a perforated plate welded to the starter ring gear (incremental wheel).

Design

Hall sensor in plastic housing with 3-pole plug connection, distance from the increment wheel 0.3 to 1.3 mm.

Function

The crankshaft Hall sensor scans the increment wheel at the starter ring gear. The increment wheel has 58 links and a gap, at which two links are missing (60-2).

Each 4 mm wide link generates a signal change at the crankshaft Hall sensor. The signal changes in the link center from around 5 V to around 0 V (negative signal edge).

No signal change takes place at the gap with the 2 missing links. The ME-SFI [ME] control unit detects the TDC position of cylinder 1 with the 2nd negative flank after the gap.

In the ignition TDC of cylinder 1, the signals from the camshaft Hall sensor are also "LOW".

Fig 2: Identifying Crankshaft Hall Sensor And Increment Wheel - Engine 272.920/940/941/960/970

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Only the negative signal edge of the crankshaft Hall sensor signal is ever evaluated. For example, for a frequency measurement, the gap between two negative edges must be measured.

The rising negative edge of the signals occurs when a window is located opposite the crankshaft Hall sensor (no material). At the wide gap in particular, the signal fluctuates greatly and is therefore not used.

Shown on engine 272

Fig 3: Identifying Crankshaft Hall Sensor Signal Pattern - Shown On Engine 272

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Shown on engine 273

Fig 4: Identifying Crankshaft Hall Sensor Signal Pattern - Shown On Engine 273

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.