Hall sensors in the W12 Volkswagen Phaeton engine

Hall sensors G40, G163, G300 and G301

All of these Hall sensors are mounted on the camshaft chain drive cover. They serve to transmit to the engine control unit signals of the position of the intake and exhaust camshafts. These signals are produced by sensors under the influence of disks mounted on the camshafts, which also serve to accelerate the start.

The engine control unit 1 determines the position of the camshafts of the first row of cylinders: the intake shaft of the signals of the Hall sensor G40 and the exhaust shaft - the signals of the sensor G300. The engine control unit 2 determines the position of the camshafts of the second row of cylinders: the intake shaft of the signals of the Hall sensor G163 and the exhaust shaft - the signals of the sensor G301.

The signals of all these Hall sensors are used to control the rotation of the camshafts in phase. The moments of fuel injection by the injectors and the moments of sparking are determined by the control unit 1 according to the signals of the sensor G40, and the control unit 2 by the signals of the sensor G163.

Consequences of lack of sensor signals

In the event of failure of any Hall sensor, the control of the camshafts of the corresponding number of cylinders is blocked. At the same time camshafts return to initial (emergency) position. The engine continues to run.