Range Rover Sport. Manual — part 52
The valve block has four air pipe connections which use 'Voss' type air fittings. The connections provide for air supply from
the air supply unit, air supply to and from the reservoir and air supply to and from the front and rear valve blocks. The
connections from the air supply unit and the front and rear control valves are all connected via a common gallery within the
valve and therefore are all subject to the same air pressures.
The valve block contains a solenoid operated valve which is controlled by the air suspension control module. The solenoid
valve controls the pressure supply to and from the reservoir. The solenoid has a resistance value of 2 Ohms at a
temperature of 20°C (68°F). When energised, the valve spool moves allowing air to pass to or from the reservoir.
The valve block also contains a pressure sensor which can be used to measure the system air pressure in the air springs
and the reservoir. The pressure sensor is connected via a harness connector to the air suspension control module. The
control module provides a 5V reference voltage to the pressure sensor and monitors the return signal voltage from the
sensor.
Using this sensor, the control module controls the air supply unit operation and therefore limits the nominal system
operating pressure to 244 lbf/in
2
(16.8 bar gage).
AIR SUPPLY UNIT
Description
1
-
Mounting bracket
2
-
Air dryer
3
-
Pilot exhaust valve solenoid and temperature sensors harness connector
4
-
Motor harness connector
5
-
Intake port
6
-
Pilot exhaust valve
7
-
Exhaust valve
8
-
Isolation mounting rubber (2 off)
9
-
Electric motor
10
-
Isolation mounting rubber (1 off)
-
Pilot air pipe
12
-
Pressure outlet to pilot exhaust valve
13
-
Compressor cylinder head temperature sensor
14
-
Compressor
The air supply unit is located on the outside of the left hand chassis rail, forward of the upper control arm. The unit is
attached to the chassis rail with three bolts and is protected by an acoustic box.
Acoustic Box
Item Part Number
Description
1
-
Upper cover
2
-
Lower cover
3
-
Air supply unit
4
-
Reservoir valve block
The acoustic box, which comprises of two parts; upper and lower, surrounds the air supply unit. The acoustic box is a plastic
moulding which is lined with an insulating foam which controls the operating noise of the air supply unit. The reservoir valve
block is also located in the acoustic box, forward of the air supply unit.
The air supply unit comprises the following major components:
A piston compressor
A 12V electric motor
A solenoid operated pilot valve
An exhaust valve
An air dryer unit
The air supply unit can be serviced in the event of component failure, but is limited to the following components; air dryer,
pilot exhaust pipe and the rubber mounts.
The air supply unit is attached to a bracket which is bolted to the chassis. The unit is mounted to the bracket with flexible
isolation mounting rubbers which assist with preventing operating noise being transmitted to the chassis.
There are a number of conditions that will inhibit operation of the air supply unit. It is vitally important that these system
inhibits are not confused with a system malfunction. A full list of air supply unit inhibits are given in the air suspension
control module section in this chapter.
Air Supply Unit - Sectional View
Item Part Number
Description
1
-
Exhaust valve cap
2
-
Plunger
3
-
Valve seat
4
-
Intake silencer port
5
-
Delivery valve
6
-
Valve guide
7
-
Cylinder head
8
-
Dryer case
9
-
Desiccant
10
-
Pilot exhaust line
11
-
Isolation rubber mount
12
-
Motor assembly
13
-
Crankcase
14
-
Crank
15
-
Crankcase cover
16
-
Connecting rod
17
-
Piston
18
-
Pilot exhaust valve
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