Steering - SMART 453 Series Introduction Into Service Manual

Steering

Steering
The new smart is equipped with a mechanical rack-and-pinion
steering gear as standard, which is located in front of the
wheel center position. An electric steering assist system with
variable steering assistance is available optionally. The newly
developed electric steering assist system of model series
453 is designed as a direct steering system with variable gea-
ring. For minor steering movements, the steering has a more
indirect design which improves straight-ahead running. In
the medium steering angle range encountered during normal
urban driving, the steering ratio increases and the customer
has to move the steering wheel through a reduced angle e.g.
when turning or maneuvering.
The electric steering power assistance system consists of the
rack-and-pinion steering gear, torque sensor, actuator motor
and control unit.
2
Electric power steering of model 453
1 Rack-and-pinion steering gear
2 Tie rod
3 Electrical power steering control unit (N68)
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– This printout will not be recorded by the update service. Status: 06/2014 –
Compared to a conventional hydraulic solution, electric stee-
ring force assistance offers the following advantages:
• No hydraulic fluid necessary
• Fuel saving due to greater efficiency
• Improved steering feel
• Optimized assembly process
• Active return improves steering centering
• Diagnosis capability
Repair information
B
When removing/installing the steering gear, all the
fasteners (bolts, nuts and triangular brackets) must be
renewed. A parts kit for this is available in the EPC.
3 4
1
4 Electric power steering actuator motor
5 Electric power steering torque sensor
Introduction of the New smart fortwo coupé and smart forfour | Model Series 453
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P46.35-2121-00