Range Rover P38
ELECTRONIC AIR SUSPENSION
1
FAULT DIAGNOSIS
REAR SUSPENSION FAULTS
This section covers possible mechanical, fuse and relay faults that could occur in the rear suspension system,
including air suspension components. Visual checks of components within the system and relevant fuses and
relays should be carried out before undertaking detailed fault diagnosis procedures, which are covered on
TestBook .
1. Symptom - Hard Ride.
POSSIBLE CAUSE
REMEDY
1. Seized or inoperable rear
shock absorber/s.
1. Renew shock absorber/s.
See Repair.
2. Loss of air pressure in the air
system resulting in the chassis
bump stops resting on the front
rear axle.
2. Check air system components for faults and air harness for leaks
etc.
See FRONT SUSPENSION, Repair.
Rectify or renew components where necessary.
3. Contaminated or fouled
suspension components with
off road debris.
3. Remove/clean off debris and check for damage. Renew
components where necessary.
4. Incorrect ride height calibration.
4. Re-calibrate air suspension system. Refer to TestBook .
2. Symptom - Vehicle Suspension Permanently In ’Standard Height’ Mode.
POSSIBLE CAUSE
REMEDY
1. Height sensor/s inoperative
due to loose or disconnected
multi-plug.
1. Reconnect multi-plug.
2. Height sensor linkage
disconnected or damaged.
2. Reconnect or renew sensor linkage.
3. Faulty height sensor/s.
3. Renew height sensor/s.
See Repair.
4. Leaking air supply to air spring
assembly.
4. Check air harness connections and pipes for damage or scoring.
5. Faulty/leaking air spring
diaphragm.
5. Renew air spring assembly.
See Repair.
6. Faulty ABS speed sensor in
ECU.
6. Refer to TestBook .
7. Faulty pressure switch.
7. Refer to TestBook .
