Land Rover Anti Lock Control Traction Control Rover Manual

Schematic Pneumatic Circuit
Compressor1
Compressor temperature sensor2
Air dryer3
Reservoir4
Front LH air spring damper module5
Front valve block6
Cross link valve7
Front RH air spring damper module8
Front RH corner valve9
Front LH corner valve10
Reservoir control valve11
Pressure sensor12
Rear RH corner valve13
Rear RH air spring damper module14
Vehicle Dynamic SuspensionLesson 2 – Chassis
53Technical Training (G421053) 

Cross link valve15
Rear valve block16
Rear LH corner valve17
Rear LH air spring damper module18
Inlet air filter19
Pilot exhaust valve20
Exhaust21
Air silencer22
Pressure relief and exhaust valve23
Motor temperature sensor24
Electric motor25
OPERATING MODES
The driver can manually select, using the air suspension
switch, one of four ride states:
•ON-ROAD - this height is the normal operating
height of the vehicle
•OFF-ROAD - this height is higher than the on-road
height and provides improved ground...

when the warning indicator is illuminated. The indicator
will change to an amber color and the audible warning
will stop when the vehicle speed is reduced.
On-Road Mode
This is the normal ride height for the vehicle.
Off-Road Mode
Off-road mode will only be activated if the vehicle speed
is less than 25 mph (40 km/h). The vehicle will be raised
55 mm (2.2 in) higher than the on-road mode to provide
additional body clearance and improved approach,
departure and breakover angles. If the vehicle speed...

the control module will lower the suspension to access
mode height. The control module will remember to
return the suspension to off-road height automatically
if the vehicle speed increases above 6.2 mph (10 km/h).
Crawl (Locked at Access) Mode
Crawl mode allows the vehicle to driven at access
height. The vehicle is locked in access height and can
be selected at a speed of less than 21.7 mph (35 km/h)
and can be driven at low speeds to improve clearance
in areas with restricted headroom, i.e. car parks....

Extended Mode
If the vehicle becomes grounded and the traction control
becomes operational, the air suspension control module
automatically increases the mass of air in the air springs
to raise the vehicle clear of the obstruction. Extended
mode is activated automatically and cannot be selected
manually.
When the air suspension control module has activated
the extended mode, the off-road mode lamp will flash
if the suspension is above off-road mode height. The
off-road mode and on-road mode lamps will...

AIR SUSPENSION CONTROL MODULE
Air suspension control module1
Connector C08672
Connector C23203
Connector C20304
Connector C23215
The air suspension control module is located behind the
instrument panel, on the drivers side A post. The
control module is attached to the A post with a single
screw and two plastic clips.
Calibration
A calibration routine is performed using T4 to access
the position of each corner of the vehicle and record the
settings in the ECU memory. Once set, the calibration
is not...

Connector C2030
Input/OutputDescriptionPin No.
OutputRear control valve - Cross link valve - positive (+)1
-Not used2
-Not used3
-Not used4
InputAir supply unit - Motor temperature sensor signal5
-Not used6
InputAir supply unit - Motor temperature sensor - Ground7
OutputSwitch pack display - Raising LED8
OutputSwitch pack display - Lowering LED9
OutputSwitch pack display - On-road mode LED10
InputRear control valve - Cross link valve - negative (-)11
-Not used12 to 16
OutputSwitch pack display - Crawl...

Connector C2321
Input/OutputDescriptionPin No.
Input12V Permanent battery supply1
InputCompressor temperature sensor - Signal2
OutputFront LH height sensor - 5 Volt supply3
InputFront LH height sensor - Signal4
InputFront LH height sensor - Ground5
OutputAir supply unit relay coil - positive6
InputAir supply unit relay coil - ground7
OutputReservoir control valve coil - positive (+)8
InputFront control valve - RH corner valve - negative (-)9
OutputFront control valve - RH corner valve - positive (+)10...

Input/OutputDescriptionPin No.
InputSwitch pack - Lower switch signal4
OutputRear LH height sensor - 5 Volt supply5
InputRear LH height sensor - Signal6
InputRear LH height sensor - Ground7
OutputRear RH height sensor - 5 Volt supply8
InputRear RH height sensor - Signal9
InputRear RH height sensor - Ground10
OutputRear control valve - RH corner valve positive (+)11
InputRear control valve - RH corner valve negative (-)12
InputAir suspension control - CJB signal13
InputSwitch pack display - LED ground14...

contacts. This allows battery voltage via the fusible link
to pass through the relay and operate the air supply unit
electric motor and the compressor.
The battery voltage is also passed from the relay, via a
splice joint in the harness, to the air suspension control
module and is used as a signal that the air supply unit
is operating.
System Inhibits
A number of conditions exist where a change of ride
height is undesirable. To counter this, the air suspension
control module is programmed with a number...