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

GF07.61-P-3017MOR 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 [ME] control unit (N3/10) generates the short-circuit-proof "TNA" engine speed signal ( for example for mechanical testing and diagnosis) and sends it as a direct signal.

Engine speed signal function sequence
When crankshaft is turning, a voltage signal (AC voltage) is generated in the crankshaft position sensor by the teeth on the increment wheel (perforated plate). Here, each tooth generates a voltage pulse. No voltage is generated at the gap where there are 2 missing teeth.

The engine speed signal TNA is a square-wave signal with a constant on/off ratio of 3 pulses per engine revolution ( 120° CA) and a maximum current of approx. 20 mA.

If the voltage signal from the crankshaft position sensor is missing, the voltage signal from the crankshaft Hall sensor of the RH cylinder bank (B6/3) is used instead (in limp-home mode)

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

Component Identification: