Suspension Component Location 1 Front RH height sensor 2 Front RH strut assembly 3 Air suspension control switch 4 Reservoir and valve block 5 Rear RH damper 6 Rear RH air spring 7 Rear cross link valve 8 External pressure relief valve (where fitted) 9 Compressor assembly 10 Rear LH air spring 11 Rear LH damper 12 Rear LH height sensor 13 Rear RH height sensor 14 Air suspension ECU 15 Front LH strut assembly 16 Front LH height sensor 17 Front cross link valve
SUSPENSION 60-2 DESCRIPTION AND OPERATION Suspension Control Diagram A = Hardwired connections BK bus C = Diagnostic DS2 bus D = CAN bus 1 Fuse A – Permanent feed 2 Fusible link 100A 3 Fuse 50A 4 Air suspension relay 5 Compressor and motor 6 Temperature sensor 7 HP exhaust valve 8 Exhaust valve 9 Control switch 10 Body control Unit (BCU) 11 Air suspension ECU 12 Driver door module (Access mode switch) 13 Reservoir pressure sensor 14 Valve block 15 Front cross link valve 16 Rear cross link valve 17 LH rear height sensor 18 RH rear height sensor 19 LH front height sensor 20 RH front height sensor 21 ABS ECU 22 Instrument pack 23 Diagnostic socket M60 0820A 1 A 2 3 4 9 10 11 12 13 14 15 16 17 18 19 20 8 5 7 6 C 21 23 B D 22
SUSPENSION DESCRIPTION AND OPERATION 60-3 Description General The main function of the four corner air suspension system is to maintain the vehicle at the correct ride height, irrespective of load. Additionally, the system allows the driver to request ride height changes to improve off-road performance or ease of access or loading. The system automatically adjusts the ride height to improve the vehicle handling and dynamics when speed increases or decreases. The system will temporarily inhibit height adjustments when the vehicle is subject to cornering, heavy acceleration or heavy braking. The inhibit function prevents unsettling of the vehicle by reducing the effective spring rates. Height changes are also inhibited for safety reasons, when a door is opened and the vehicle is stationary for example. The air suspension system fitted to Range Rover is controlled by an ECU located behind the passenger side of the fascia. The ECU monitors the height of each corner of the vehicle via four height sensors, which are mounted inboard of each road wheel. The ECU also performs an 'on-board diagnostic' function to perform 'health checks' on the system. If faults are detected, codes are stored in the ECU and can be retrieved using TestBook/T4. The independent front and rear suspension offers many design and performance advantages over the conventional beam axle design.