Crankshaft Position Sensor: Description and Operation

GF07.04-P-6230V Component Description For The Position Sensor Tumble Flap







Location
The position sensors are located at the rear on the intake manifold over the tumble flap shafts.

Task
To diagnose the tumble flap switchover, the position sensors detect the mechanical limit positions of the shafts. The swivel range of the tumble flaps between completely swiveled in or out is approx. 56°.

Design
The position sensors function according to the Hall principle.

Function
Two cylindrical magnets with different polarities are attached to each tumble flap shaft.

After swinging out the tumble flaps a cylindrical magnet is located at the Hall sensor and the position sensor interconnects. The signal at the ME-SFI [ME] control unit is about 0 V (tumble flaps actuated).

If the tumble flaps swing back then the other poled cylindrical magnet is on the Hall sensor is in the rest position. The position sensor opens and interrupts the connection to ground. The signal at the ME-SFI [ME] control unit is now about 5 V (tumble flaps not actuated).

The position sensors must switch no later than approx. 5° before the respective limit position. For reasons of tolerance, they may also switch up to approx. 16° before the limit position.