Repair manual

Engine Mechanicals
10
Function
A solenoid is integrated in the actuator. When the
solenoid is activated by the ECM, a metal pin is extended.
The solenoid is activated through brief application of
battery voltage.
When the metal pin is extended, it is held in position by a
permanent magnet on the actuator housing.
Due to the quick extension time (18 – 22 ms), the metal
pin undergoes very rapid acceleration. A damping ring
near the permanent magnet ensures that the pin does
not bounce back or become damaged.
The metal pin extending into the displacement groove
then moves the cam element as the camshaft rotates.
The contour of the displacement groove is designed to
push the metal pin of the actuator back after just under
one revolution of the actuator. The permanent magnet
ensures that the metal pin remains in this position. When
the permanent magnet pushes the metal pin, voltage is
induced in the magnetic coil of the solenoid.
This return signal is registered by the ECM. It can only
be generated if the metal pin is pushed by back by
the displacement groove after the cam element has
been moved. The ECM evaluates the signal input as a
successful adjustment.
Solenoid Coil
Electrical
Connection
Metal Pin
Damper Ring
ActivatedNot Activated
Magnetic Coil
Pole Plate
Permanent
Magnet