Land Rover Discovery: Air Suspension Testing

CAUTIONS:

• Make sure that the vehicle is clear of people and obstacles before adjusting the suspension.
• To maintain control of the vehicle at a standstill, during suspension height adjustment, make sure that the Electric Parking Brake (EPB) is applied. Also make sure that the transmission is engaged in Neutral (N) or Park (P).

NOTES:

• Suspension adjustment slows and stops, if there is not sufficient air reserves in the electronic air suspension system. In this event, start the engine to allow operation of the compressor. Run the engine until sufficient air reserves resume.
• Normal operation of the compressor generates heat. In the event of overheating, switch off the engine and allow time for the compressor to cool.
• The electronic air suspension system may raise or lower the vehicle automatically. For example, if a terrain response driving program requires it or if the vehicle is travelling at high speeds.

Functional checks of the air suspension system must be performed with all doors closed:

• Up button: Press and release to raise the suspension height. Off-road height indicator lamp: Illuminates when the suspension is set to off-road height.
• Down button: Press and release to lower the suspension height. Normal height indicator lamp: Illuminates when the suspension is set to normal height.
• Access height button: Press to set the suspension to access height.

  Access height indicator lamp: Illuminates when the suspension is set to access height.

NOTE:

The electronic air suspension system may raise or lower the vehicle automatically. For example, if a terrain response driving program requires it or if the vehicle is travelling at high speeds.

ROAD TEST

NOTE:

For additional information on systems that must be checked, refer to the relevant Specification section in the Workshop Manual.

During a road test, functional checks of the following systems/circuits must be carried out.

• Check correct operation of dashboard, instruments and switches.
• Check correct operation of climate control system.
• Check correct operation of park brake.
• Check correct operation of selector mechanism and clutch (manual transmission).
• Check correct operation of drive selector and steering wheel paddles (automatic transmission).
• Check the steering wheel is in the straight ahead position.
• Check steering operation is smooth, accurate, not excessively heavy or with excessive free play or vibration. Does not pull to one side and self centres smoothly after cornering.
• Check overall handling, straight-line stability and abnormal noise or vibration.
• Check the engine power output is satisfactory, acceleration is smooth and accelerator pedal operation is not stiff or heavy, and engine speed returns to idle correctly.
• Check cruise control engages and disengages correctly.
• Check brakes operate correctly.
• Select the LOW range gears and drive the vehicle 3 to 4 vehicle lengths then re-select HIGH range gears (if fitted).
• Check correct operation of air suspension system (if fitted).
• Check operation of the Stop/Start system (if fitted).

Pre -test and Functional ChecksRoad- Roller Testing

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