Engine Speed (RPM)/Reference Sensor

Engine speed (RPM) and crankshaft position are registered by a single sensor located on side of engine block. The sensor reads a toothed wheel mounted on the crankshaft. The wheel has a 2-tooth gap which is used as a reference point for crankshaft position. The engine speed/reference signal is used to monitor engine RPM and to identify TDC position of cylinder No. 1.