Land Rover Discovery: Power Steering - Overview
COMPONENT LOCATION
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- Steering gear
- Steering column intermediate shaft
- Heat shield
Overview
The vehicle is fitted with electric power steering, provided by a ZF Servolectric steering gear unit with variable ratio, rack and pinion steering and speed sensitive power assistance. Power assistance is from an electric motor attached to the steering gear.
The steering gear also incorporates:
- A Power Steering Control Module (PSCM), on the end of the electric motor.
- A reduction gear.
- A torque sensor on the gear mechanism.
Power assistance is controlled by the PSCM, which uses the electric motor to apply an axial force on the steering rack via the reduction gear. The level of power assistance depends on the:
- steering torque applied with the steering wheel,
- vehicle speed, and
- terrain response mode selected.
The PSCM also uses the electric motor to provide the following assistance features:
- Pull drift compensation.
- Assistance changes during Eco Stop/Start functions.
- Assistance reduction if system overheats.
- Assistance reduction if supply voltage is too low or high.
- Assistance reduction for system stability optimization.
- Soft end stops.
- Park assist support / interface (where fitted).
For additional information, refer to: Parking Aid (413-13 Parking Aid, Description and Operation).
- Lane Departure Warning support (where fitted).
For additional information, refer to: Warning Devices (413-09 Warning Devices, Description and Operation).
READ NEXT:
Power Steering - Description
Steering Gear
Recirculating ball nut
Steering rack
Pinion shaft
Torque sensor
Boot (2 off)
Track rod (2 off)
Threaded boss for securing bolt (2 off)
Signal and power lead for torque sensor
Power Steering - Operation
For the electric power steering system to provide assistance the engine
must be running - with one exception - see: ASSISTANCE CHANGES
DURING ECO STOP/START FUNCTIONS, below.
If a fault occurs which a
SEE MORE:
Head restraints
FRONT HEAD RESTRAINTS
Adjust the head restraint so that
the top of the head restraint is
above the centre line of the head.
An incorrectly adjusted head
restraint increases the risk of
death or serious injury in the
event of a collision.
Do not drive, or carry passengers
with the head restraints re
Road Test
DESCRIPTION AND OPERATION
WARNING:
At commencement of a road test, check the brake operation while
travelling at low speed before continuing with the test. If the brakes
pull to one side, or appear to be otherwise inoperative, do not
continue with the road test until the fault has been found and
rec
