GF07.61-P-3017MLK ME Engine Speed Signal, Function

GF07.61-P-3017MLK ME Engine Speed Signal, Function
- refinement package
- as of model year 09


Engine speed signal unction requirements, general
^ Circuit 87 M ON (engine control ON)
^ Engine running

Engine speed signal, general
Using the signal from the crankshaft position sensor (L5), the ME-SFI control unit (N3/10) generates the short-circuit-proof TNA engine speed signal and sends it as a direct signal, for example for mechanical tests and diagnosis.

Engine speed signal function sequence
When the crankshaft is rotating, an AC voltage is generated in the crankshaft position sensor by the teeth on the clutch plate. During this operation, each tooth generates an alternating voltage signal. No voltage is generated as a result of the gap created by 2 missing teeth.

The engine speed signal TNA is a square-wave signal with a constant on/off ratio of 6 pulses per engine revolution (a 60° CA) and a maximum current of approx. 20 mA.

If the signal from the crankshaft position sensor fails, the signal from the camshaft Hall sensor (B6/1) is used instead.

The engine speed signal can be read out at the data link connector (X11/4) using commercially available diagnostic units.

Component Identification: