C 350 (204.056) V6-3.5L (272.961) (2008)
Crankshaft Position Sensor: Description and Operation
GF07.04-P-6221CY Component Description For The Crankshaft Hall Sensor
- up to model year 08
Location
Component Identification
The Hall sensor is located behind the left cylinder bank on the transmission flange.
Task
The Hall sensor detects the position and rotational speed of the crankshaft in a non-contact manner via the increment wheel (perforated plate) on the
starter ring gear.
Design
The Hall sensor and its electronics are cast in a plastic housing with a 3-pin connector. The distance to the increment wheel is dictated by the installation
position and is about 0.3 to 1.3 mm.
Function
Component Identification
The Hall sensor scans the perforated plate with its 58 links and the gap of 2 links (60-2).
Each 4 mm wide link generates a signal change at the Hall sensor. In the center of the link, 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. At the second falling (negative) signal edge after the gap the ME-SFI [ME]
control unit (N3/10) detects the top dead center position of cylinder 1.
Only the negative signal edge of the signal is permanently evaluated. For a frequency measurement, the gap between two negative edges must be
measured.
The signal for the rising (positive) signal edge fluctuates and is therefore not used.