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In the Audi A4’08, dynamic steering is featured for Over and above this, the dynamic steering system the first time in an Audi vehicle. This steering sys assists the ESP system in specific driving situations tem eliminates the compromise of having a con by implementing corrective steering inputs which stant steering ratio. An optimal steering ratio is serve to maintain dynamic stability. This intelligent obtained as a function of driving speed and steering new system, therefore, not only enhances driving wheel angle. The dynamic steering system provides and steering comfort, but also provides a marked a suitable steering ratio for every situation whether improvement in active motoring safety. parking, driving on windy country roads or at high speed on a motorway. 402 004 Contents Introduction Basic design and functions System overview / system components Active steering control unit J792 . 10 Actuator . .1. 1 Electric motor 14 Dynamic steering lock . 15 Sensors . .1. 6 System overview . 18 Function diagram / CAN data interchange Operation and driver information Steering ratio selection 22 Functions of the ESP button E256 22 Function and fault indication 23 Special system functions Initialisation .2. 4 Initialisation after a fault . 25 Servicing Steering pump with ECO function Overview . .28 Design and function 29 System response in the event of a fault . 30 The self study programme teaches the design and function of new vehicle models, new automotive parts or new technologies. Reference Note The self study programme is not a repair manual All values given are intended as a guideline only and refer to the software version valid at the time of prepara tion of the SSP. For maintenance and repair work, always refer to the current technical literature. Introduction In conventional steeringsyst ems there is a direct Nevertheless, only one ratio can be implemented in mechanical c