Technical data

21
8
Throttle valve sensor (DKG)
Two potentiometers are activated per cylinder
bank:
• One potentiometer for the position control.
It is powered and read by the EDR satellite.
The read value is transferred via the CAN to
the DME. In the event of failure, the affected
unit is switched off.
• A further potentiometer is responsible for
monitoring. It is powered and read by the
DME.
Both throttle valve sensors 1 and 2 are
designed as double Hall sensors. These four
sensors detect the position (angle) of the
throttle valves of cylinder bank 1 and 2.
The two Hall sensors integrated in one
housing feature an inverted characteristic
curve (one raising, one falling).
The EDR uses the sensor with the raising
characteristic for position control purposes.
The DME uses the redundant sensor with
falling characteristic to monitor the throttle
valve control.
Secondary air pump
The electric secondary air pump is
maintenance-free. The integrated filter does
not need to be changed.
The pump is activated by the DME. The
delivery capacity is always at 100 % and is not
controlled.
10 - Throttle valve sensor (1)