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:
Blind spot monitoring
BLIND SPOT MONITOR (BSM)
The Blind Spot Monitor (BSM)
system is a supplement to, not a
replacement for, a safe driving
style and use of the exterior and
rear-view mirrors. The system may
not function under all speeds,
weather and road conditions.
The BSM may not be able to give
adequate warning of v
General warning/ information message (amber)
Illuminates when a non-critical
warning message or an
information message is available
in the Message centre.
GLOW PLUGS (AMBER)
Illuminates when the ignition is
switched on, to indicate that the
glow plugs are active.
LOW FUEL WARNING (AMBER)
Illuminates when the fuel level
is low. Refuel at the ea
