ME engine speed signal, function - GF07.61-P-3017KE

ENGINE 271.921 in MODEL 203

ENGINE 271.940 in MODEL 203, 209

ENGINE 271.941 in MODEL 211

ENGINE 271.944 in MODEL 171

ENGINE 271.946 in MODEL 203

ENGINE 271.948 in MODEL 203

ENGINE 271.955 in MODEL 209

ENGINE 271.956 in MODEL 211

Fig 1: Signal Assignment Of ME Engine Speed - Engines 271.921/940/946/948

From the signals from the crankshaft position sensor (L5) the short circuit-proof engine speed signal TNA is generated in the ME control unit (N3/10) and forwarded to other control units via the CAN data bus.

The teeth on the increment wheel cause the turning crankshaft to generate an alternating voltage in the crankshaft position sensor. 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 duty cycle of 6 pulses per engine revolution (30° crank angle) and a maximum current of approx. 20 mA.

If the signal from the crankshaft position sensor fails the signal from the left intake camshaft Hall sensor (B6/4) or right exhaust camshaft Hall sensor (B6/7) is used as a substitute (for limp-home).

Component description for the crankshaft position sensor	L5	GF07.04-P-6010KE
Component description for the camshaft Hall sensor	B6/4, B6/7	GF07.04-P-6020KE
Component description for the ME control unit	N3/10	GF07.61-P-6000KE