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

GF07.61-P-3017MAS ME Engine Speed Signal, Function
- 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 Hall sensor (B70), the ME-SFI control unit (N3/10) generates the short-circuit-proof engine speed signal (TN) (e.g. for mechanical testing and diagnosis) and sends it as a direct signal.

Engine speed signal function sequence
A voltage pulse (AC voltage) is generated in the crankshaft Hall sensor by the stays on the increment wheel (perforated plate) for a turning crankshaft. Here each stay generates a voltage pulse. No voltage is generated as a result of the gap created by 2 missing stays.

The engine speed signal is a square wave signal with a constant duty cycle of 6 pulses per engine revolution (60° CKA ( Crank Angle)) and maximum current about 20 mA.

If the voltage pulse fails from the crankshaft Hall sensor, voltage pulses from the intake camshaft Hall sensors, on the left and right (B6/4, B6/5) are used instead (for limp-home mode) or used by the exhaust camshaft Hall sensors, on the left and right (B6/6, B6/7).

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

Component Identification: