Brief description of components: Notes

The following control units are involved in the Servotronic:

• Servotronic control unit (SVT) 

  The SVT control unit specifies the nominal values for controlling the Servotronic valve (hydraulic pressure). The SVT control unit is connected to the PT-CAN (powertrain CAN) and K-Bus (body bus).

• DSC control unit (Dynamic Stability Control) 

  The DSC control unit delivers the car's road speed signal. The DSC control unit and SVT control unit are connected by the PT-CAN.

• DME or DDE (Digital Engine Electronics or Digital Diesel Electronics DDE) 

  The Servotronic receives the signal of whether the engine is running from the DME or DDE over the PT-CAN. The Servotronic only activates the Servotronic valve when the engine is running.

• Instrument cluster (KOMBI) 

  The instrument cluster delivers the terminal status (e.g. terminal 15 ON) and the kilometer reading.

The following actuators are controlled by the Servotronic:

• Servotronic valve 

  The Servotronic valve is an electro-hydraulic converter located in the power-assisted steering oil circuit. The Servotronic valve restricts the hydraulic current and consequently reduces the hydraulic pressure.

  The Servotronic valve is activated by a characteristic curve delivered by the SVT control unit.