Range Rover. Manual — part 184
ELECTRONIC AIR SUSPENSION
1
FAULT DIAGNOSIS
FRONT SUSPENSION FAULTS
This section covers possible mechanical, fuse and
relay faults that could occur in the front 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 .
Symptom - Hard Ride.
POSSIBLE CAUSE
REMEDY
1. Seized or inoperable front
shock absorber/s.
1. Renew shock absorber.
See Repair.
2. Loss of air pressure in the air
system resulting in the chassis
bump stops resting on the front
and rear axles.
2. Check air system components for faults and air harness for leaks
etc.
See 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 .
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/s.
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 .
60
FRONT SUSPENSION
NEW RANGE ROVER
2
FAULT DIAGNOSIS
Symptom - Excessive Body Roll At Front Of Vehicle.
POSSIBLE CAUSE
REMEDY
1. Anti-roll bar damaged or
broken.
1. Renew anti-roll bar.
See Repair.
2. Worn anti-roll bar axle
mounting rubbers.
2. Renew mounting rubbers.
See Repair.
3. Worn or broken anti-roll bar link
ball joints.
3. Renew link assembly.
See Repair.
4. Loose anti-roll bar chassis and
axle fixings.
4. Check and tighten all relevant fixings.
5. Worn or leaking shock
absorber/s.
5. Renew shock absorber/s.
See Repair.
6. Worn radius arm axle mounting
bushes.
6. Renew radius arm bushes.
See Repair.
7. Loose radius arm fixings.
7. Check and tighten all relevant fixings.
8. Worn radius arm chassis
mounting bushes.
8. Renew radius arm bushes.
See Repair.
9. Deflated air spring.
9. Check air system components for faults and air harness for leaks
etc.
See Repair.
Rectify or renew components where necessary.
10. Faulty valve block.
10. Refer to TestBook .
11. Damaged or broken chassis or
axle mounting brackets.
11. Vehicle should be recovered and not driven.
12. Failed or loose body mountings
giving excessive body
movement to chassis.
12. Tighten fixings or renew rubber body mountings if failed.
Symptom - Suspension Knock.
POSSIBLE CAUSE
REMEDY
1. Loose or worn suspension
component mountings and
fixings.
1. Check, tighten or renew relevant components and fixings.
2. Missing bump stop/s.
2. Fit new bump stop/s.
See Repair.
ELECTRONIC AIR SUSPENSION
3
FAULT DIAGNOSIS
Symptom - Air Suspension System Faulty Or Inoperative.
POSSIBLE CAUSE
REMEDY
1. Blown air suspension system
fuse.
1. Check and renew fuse F44.
2. Blown fuse covering dashboard
’height control’ or ’inhibit’
switch.
2. Check and renew fuse F17.
3. Faulty ’height control’ switch;
could result in vehicle height
remaining at last setting until
ignition switched off.
3. Refer to TestBook to confirm fault and renew ’height control’
switch.
See ELECTRICAL, Repair.
4. Faulty ’inhibit’ switch; could
result in vehicle not operating
automatically between
standard and low modes.
4. Refer to TestBook to confirm fault and renew ’inhibit’ switch.
See
ELECTRICAL, Repair.
5. Compressor inoperative; no air
pressure due to loose or
disconnected multi-plug.
5. Check and reconnect compressor multi-plug.
6. Blown compressor maxi fuse.
6. Check and renew maxi fuse 2.
7. Faulty compressor relay,
resulting in compressor running
continuously.
7. Renew relay RL20.
8. Loss of air pressure in the air
system.
8. Check air system components for faults and air harness for leaks.
See Repair.
9. Faulty delay relay. If the delay
relay fails with a closed circuit
the system will be powered,
resulting in a flat battery.
9. Renew relay AMR3284.
Symptom - Vehicle Leaning Side To Side Or Front To Rear With Air Suspension System Operative.
POSSIBLE CAUSE
REMEDY
1. Faulty height sensor.
1. Refer to TestBook to locate faulty height sensor. Renew height
sensor and re-calibrate air suspension system. Refer to TestBook .
2. Incorrect height sensor
calibration.
2. Re-calibrate air suspension system. Refer to TestBook .
NOTE: Critical warning messages relating to the air suspension system are displayed on the
message centre, should a fault occur.
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