C 350 (204.056) V6-3.5L (272.961) (2008)
Camshaft Position Sensor: Description and Operation
GF07.04-P-6022CY Component Description For The Camshaft Hall Sensor
- up to model year 08
Component Identification
Hall sensors are at the front on the cylinder head, in front of the respective camshaft.
Task
Hall sensors detect the camshaft position for the following functions in a contact-less manner via pulse wheels on the camshaft:
^
Camshaft adjustment
^
Synchronization of the ignition and injection sequence (detection of ignition TDC).
^
Emergency start for a defective crankshaft Hall sensor (B70)
Design
They consist of a cast in Hall sensor in a plastic housing with a 3-pin connector.
Function
Detection of camshaft position takes place via the position of the pulse wheel on camshafts. Electronics in Hall sensors ensure that the camshaft positions
are already detected at engine OFF. This results in an improvement in the exhaust levels because the optimal injected quantity of fuel can be assigned to
each cylinder immediately when the engine is started (quick-start function).
Four signals are generated per camshaft per camshaft rotation. Here the signal switches between about 5 V "High" and 0 Volt "Low". If an opening
(window) in the pulse wheel is opposite the sensor, the signal is approx. 5 V.