Suspension Air Supply Unit
| ITEM | DESCRIPTION |
|---|---|
| 1 | Inner acoustic box cover |
| 2 | Exhaust silencer |
| 3 | Air drier |
| 4 | Intake air filter |
| 5 | Air suspension compressor |
| 6 | Electric motor |
| 7 | Electrical connectors |
| 8 | Air outlet |
The suspension air supply unit comprises the following major components:
- A two stage piston air suspension compressor
- A 12V electric motor
- A solenoid operated exhaust pilot valve
- A pneumatically operated exhaust valve
- An air dryer unit
- An air suspension compressor temperature sensor.
The acoustic box surrounds the suspension air supply unit. The acoustic box is double layer box which is lined with insulating foam which suppresses the operating noise of the suspension air supply unit. Each layer of the box has a plastic moulded base and a pressed steel lid.
The suspension air supply unit supplies dry compressed air into the air suspension system where it is directed into the air springs or the air reservoir by solenoid operated valves.
Air can be exhausted from the system when required:
- By the opening of an air spring.
- By the opening of the air reservoir valve in addition to the exhaust valve, which is part of the suspension air supply unit.
The air suspension compressor operates to pressurize either the reservoir or to inflate one or more of the air springs.
The air suspension compressor will not operate without the engine running, with the following exceptions:
- During remote operation or during rear height adjust operation to raise the vehicle to allow for the attachment of a trailer.
- When under control of a Jaguar Land Rover approved diagnostic system.
There are a number of conditions that will inhibit operation of the suspension air supply unit. It is vitally important that these system inhibits are not confused with a system malfunction.