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).
READ NEXT:
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
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:
PART(S)
REMOVAL
NOTE:
Removal steps in this procedure may contain installation details.
Connect the diagnostic tool and set the electronic park brake (EPB)
to the maintenance position
NOTE:
This step is only required if the diagnostic tool is not
available.
Refer to: Electronic Parking Brake
REMOVAL
NOTE:
The rear side member lower side extension is installed in conjunction
with:
Rear bumper cover
Rear bumper
Back panel outer
Back panel inner
Rear lamp panel outer
The rear side member lower side extension is serviced as indicated.
Before commencing this procedure make sure t