L322 Range Rover System Description and Operation
STEERING
DESCRIPTION AND OPERATION
57-9
Description
General
Rack and pinion steering is introduced on Range Rover for the first time. A ZF power assisted steering rack is fitted
on the front subframe. The rack is a conventional end take-off rack and pinion power assisted unit with the addition
of ZF Servotronic 2 assistance.
Servotronic 2 adds electronic control and speed sensitive steering to the steering rack. The Servotronic 2 feature
provides easy and comfortable steering operation when parking, improved 'road feel' at increased road speeds and
adds an integrated, positive centre feel feature which optimises steering wheel torque during high speed driving.
The Servotronic 2 system is controlled by software which is incorporated into the Body Control Unit (BCU). The
software responds to steering torque inputs and road speed signals and controls the assistance via a transducer valve
located on the steering rack valve.
The steering column features fully electrical adjustment for tilt and reach. On vehicles fitted with memory seats, the
steering wheel position control is incorporated into the memory seat ECU.
The column also features an electronically controlled steering lock. The lock is operated when the ignition switch
senses that the correct key has been inserted. An ECU, located inside the steering column, controls a motor operated
lock, releasing the steering lock when appropriate.
