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Home >> Mercedes Benz >> 2000 >> CLK 320 (208.365) V6-3.2L (112.940) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Initial Inspection and Diagnostic Overview >> Initial Inspection (Description and Operation of ME-SFI Systems & Components) >> Crankshaft Position Sensor, Location/Task/Design/Function >> Crankshaft Position Sensor, Function
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Crankshaft Position Sensor, Function




Crankshaft Position Sensor, Function




Shown on engine 120
L5/4 Left CKP sensor
L5/5 Right CKP sensor

Function
Crankshaft position and engine speed are detected contactlessly. The distance between crankshaft position sensor and the teeth of the driven plate is fixed by the installation position.
When the crankshaft is rotating, an alternating voltage is generated in the crankshaft position sensor by the teeth of the driven plate.




L5/4 Left CKP sensor (e.g. engine 120)
L5/5 Right CKP sensor (e.g. engine 120)
a Leading edge of tooth
b Trailing edge of tooth
c 2 missing teeth (gap)
s Screening
x Wiring diagram illustration of the position sensor Crankshaft with 2-pin coax-Plug contact

The leading edge of a tooth generates a positive voltage pulse and the trailing edge a negative voltage pulse. The distance from the positive to the negative voltage peak corresponds to the length of a tooth.
The gap produced by 2 missing teeth results in no voltage being generated in the crankshaft position sensor. This is analyzed for detecting the TDC position:
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