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

ENGINE 156.980 in MODEL 164, 251

ENGINE 156.982 in MODEL 209

ENGINE 156.983 in MODEL 211, 219

ENGINE 156.984 in MODEL 216, 221

Location

The crankshaft Hall sensor is located at the upper left on the transmission flange.

Fig 1: Identifying Crankshaft Hall Sensor

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Task

The crankshaft Hall sensor detects in a non-contact manner the position and rotational speed of the crankshaft via the perforated plate (increment wheel) on the starter ring gear.

Function

Design

The Hall sensor and its electronics are cast in a plastic housing with a 3-pin plug connector.

The Hall sensor scans the perforated plate with its 58 links and the gap of 2 missing links (60-2).

Each 4 mm wide link generates a signal change at the crankshaft Hall sensor. In the center of the gap, the signal changes from approx. 5 V (high) to approx. 0 V (low). 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 N3/101 for the second negative flank after the gap.

The proximity of the crankshaft Hall sensor to the perforated plate i determined by its installation position and is about 0.8 mm (±0.5 mm).

Fig 2: Identifying Crankshaft Hall Sensor And Increment Wheel

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.