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:
Electronic Engine Controls
- Ingenium i4 2.0l Diesel
Post Selective
Catalyst Reduction
Nox Sensor (G1942280)
/ Removal and Installation
SPECIAL TOOL(S)
REMOVAL
WARNING:
Observe due care when working near a hot exhaust system.
CAUTIONS:
The post selective catalyst reduction NOx sensor and module are a
single component and cannot be serviced separately. Do not
attempt to disconnect the harness from the module, or damage to
the
Fuse box locations
When a fuse box lid is removed,
take care to protect the box from
moisture, and refit the lid at the
earliest opportunity.
Access can be gained to the fuses, as
follows:
Engine compartment fuse box.
To gain access to the fuse box:
Remove the 2 plastic fixings (see
illustration) and pull the
