Camshaft Sensor: Notes

The signal from the camshaft sensor enables the EMS2000 to detect the position of the camshaft in relation to the position of the crankshaft. This allows the EMS2000 to synchronize the fuel injection and ignition spark.

The camshaft sensor is located in the front of the engine cylinder head just below the valve cover. The sensor reluctor ring is bolted to the front of the camshaft.

A digital signal is provided by the sensor in the range of 0-5 volts. The Hall Effect device produces one pulse for each revolution of the camshaft. The reluctor is of a half moon form with a single "tooth" that extends over 180° of the camshaft rotation.

Fig 1: Camshaft Sensor In Cylinder Head

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 2: Camshaft Reluctor Ring

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 3: Scope Pattern For "Good" Camshaft Sensor

Courtesy of BMW OF NORTH AMERICA, INC.