steering wheel adjustment JAGUAR XFR 2010 1.G Workshop Manual

Operation and
Component DescriptionCellular PhoneComponent
Location
Overview
System Operation
and Component DescriptionNavigation SystemComponent Location
Overview
System Operation and Component DescriptionVideo SystemComponent
Location
Overview
System Operation
and Component DescriptionDiagnosis and TestingInformation and Entertainment SystemRemoval and InstallationAudio Unit
Audio Unit Antenna Amplifier
Audio and Climate Control Assembly
Front Door Speaker
Information and Entertainment Display
Information and Entertainment Module
Instrument Panel Speaker
Rear Door Speaker
Steering Wheel Audio Controls
Subwoofer Amplifier
Subwoofer Speaker
Satellite Radio Tuner415-01B: Information and Entertainment System - DTC: Audio Input Control Module
Diagnosis and TestingAudio Input Control Module417: Lighting
417-01: Exterior LightingSpecificationDescription and OperationComponent Location
Overview
System Operation and Component DescriptionDiagnosis and TestingHeadlampsGeneral ProceduresHeadlamp Adjustment (86.40.18)

Deployment procedures and precautions as detailed in this manual should be strictly adhered to. Only personnel who have
undergone the appropriate training should undertake deployment of airbag and pre-tensioner modules. The following
precautions must be complied with:
Only use deployment equipment approved for the intended purpose.
Deployment of airbag / pre-tensioner modules must be performed in a well ventilated area which has been designated
for the purpose.
Make sure airbag / pre-tensioner modules are not damaged or ruptured before attempting to deploy.
Where local legislation exists, notify the relevant authorities of intention to deploy airbag and pretensioner units.
When deploying airbag pre-tensioner units, make sure that all personnel are at least 15 metres (45 feet) away from the
deployment zone.
Make sure deployment tool is connected correctly, in compliance with the instructions detailed in the SRS section of this
manual. In particular, make sure deployment tool is NOT connected to battery supply before connecting to airbag
module connector.
When deploying seat belt pre-tensioners, make sure pre-tensioner unit is secured correctly to the seat.
When removing deployed airbag modules and pre-tensioner units, wear protective clothing. Use gloves and seal
deployed units in a plastic bag.
Following deployment of any component of the SRS system within the vehicle, all SRS components must be replaced.
DO NOT reuse or salvage any parts of the SRS system.
Do not lean over an airbag module when connecting deployment equipment.

If a vehicle is to be scrapped, undeployed airbag modules and pre-tensioner units must be manually deployed. In this case
airbags can be deployed in the vehicle. Before deployment, make sure the airbag module is secure within its correct mounting
position. Deployment of the driver's airbag in the vehicle may damage the steering wheel; if the vehicle is not being scrapped,
deploy the module outside of the vehicle.

SRS Component Replacement Policy

CAUTIONS:


The Restraints Control Module (RCM) will log a crash fault after every impact which is severe enough to cause airbag
deployment. It is possible to have three crashes/impacts logged after one event where, for example, a front, side and
rollover has occurred. After the third fault is logged, the SRS warning lamp will be illuminated and the RCM must be
installed. After any airbag deployment a new RCM must be installed.


The SRS side impact sensor must be replaced if there are any signs of physical damage or if the restraints control module
(RCM) is registering a fault.
The following information details the policy for replacement of SRS components as a result of a vehicle accident.

Impacts which do not deploy the airbags or pre-tensioners

Check for structural damage in the area of the impact paying particular attention to bumper armatures, longitudinals and
bracketry.
Impacts which deploy the airbags or pre-tensioners

The replacement and inspection policy is dependent on the type and severity of the crash condition. The following guidelines
are the minimum that should be exercised as a result of the deployment of specific SRS components.

Check for structural damage in the area of impact paying particular attention to bumper armatures, longitudinals and
bracketry.

Front Airbag Deployment - Driver and Passenger

CAUTION: If the front airbags are deployed, the following components must be replaced:
Driver airbag module
Passenger airbag module
Fly leads (where applicable) connecting front airbag modules to SRS harness
Front seat belt buckle pre-tensioner
Rear seat belt pre-tensioners - if installed
Driver's seat belt retractor - if installed
Rotary coupler
Any front impact sensors that have been physically damaged or if a fault is being registered
Restraints control module (RCM) if the three crashes/impacts have been stored
Additionally, the following items must be inspected for damage and replaced as necessary:

Front passenger's seat belt retractor and webbing, tongue latching function, 'D' loop and body anchorage point
Rear seat belt buckles, webbing, buckle covers, body anchorage points and tongue latching function
Fascia moulding adjacent to passenger airbag module
Steering wheel
Front seat frames and head restraints
Steering column - if adjustment is lost or if there are signs of collapse
Seat belt height adjusters

it may turn out to be the most important.

2. Do not touch anything until a road test and a thorough visual inspection of the vehicle have been carried out. Leave the
tire pressures and vehicle load just where they were when the condition was first observed. Adjusting tire pressures,
vehicle load or making other adjustments may reduce the conditions intensity to a point where it cannot be identified
clearly. It may also inject something new into the system, preventing correct diagnosis.

3. Make a visual inspection as part of the preliminary diagnosis routine, writing down anything that does not look right.
Note tire pressures, but do not adjust them yet. Note leaking fluids, loose nuts and bolts, or bright spots where
components may be rubbing against each other. Check the luggage compartment for unusual loads.
4. Road test the vehicle and define the condition by reproducing it several times during the road test.

5. Carry out the Road Test Quick Checks as soon as the condition is reproduced. This will identify the correct diagnostic
procedure. Carry out the Road Test Quick Checks more than once to verify they are providing a valid result. Remember,
the Road Test Quick Checks may not tell where the concern is, but they will tell where it is not.

Road Test Quick Checks

1. 24-80 km/h (15-50 miles/h): With light acceleration, a moaning noise is heard and possibly a vibration is felt in the
front floor pan. It is usually worse at a particular engine speed and at a particular throttle setting during acceleration at
that speed. It may also produce a moaning sound, depending on what component is causing it. Refer to Tip-In Moan in
the Symptom Chart.

2. Acceleration/deceleration: With slow acceleration and deceleration, a shake is sometimes noticed in the steering
wheel/column, seats, front floor pan, front door trim panel or front end sheet metal. It is a low frequency vibration
(around 9-15 cycles per second). It may or may not be increased by applying brakes lightly. Refer to Idle Boom/Shake
/Vibration in the Symptom Chart.

3. High speed: A vibration is felt in the front floor pan or seats with no visible shake, but with an accompanying sound or
rumble, buzz, hum, drone or booming noise. Coast with the clutch pedal depressed or shift control selector lever in
neutral and engine idling. If vibration is still evident, it may be related to wheels, tires, front brake discs, wheel hubs
or front wheel bearings. Refer to High Speed Shake in the Symptom Chart.

4. Engine rpm sensitive: A vibration is felt whenever the engine reaches a particular rpm. It will disappear in neutral
coasts. The vibration can be duplicated by operating the engine at the problem rpm while the vehicle is stationary. It
can be caused by any component, from the accessory drive belt to the torque converter which turns at engine speed
when the vehicle is stopped. Refer to High Speed Shake in the Symptom Chart.

5. Noise/vibration while turning: Clicking, popping, or grinding noises may be due to a worn, damaged, or incorrectly
installed front wheel bearing, rear drive half shaft or CV joint.

6. Noise/vibration that is road speed relative: This noise/vibration can be diagnosed independent of engine speed or gear
selected (engine speed varies but torque and road speed remain constant). The cause may be a rear drive
axle/differential whine.
Road Conditions

An experienced technician will always establish a route that will be used for all NVH diagnosis road tests. The road selected
should be reasonably smooth, level and free of undulations (unless a particular condition needs to be identified). A smooth
asphalt road that allows driving over a range of speeds is best. Gravel or bumpy roads are unsuitable because of the additional
road noise produced. Once the route is established and consistently used, the road noise variable is eliminated from the test
results.


NOTE: Some concerns may be apparent only on smooth asphalt roads.

If a customer complains of a noise or vibration on a particular road and only on a particular road, the source of the concern
may be the road surface. If possible, try to test the vehicle on the same type of road.

Vehicle Preparation

Carry out a thorough visual inspection of the vehicle before carrying out the road test. Note anything which is unusual. Do not
repair or adjust any condition until the road test is carried out, unless the vehicle is inoperative or the condition could pose a
hazard to the technician.
After verifying the condition has been corrected, make sure all components removed have been installed.

Lift Test

After a road test, it is sometimes useful to do a similar test on a lift.

When carrying out the high-speed shake diagnosis or engine accessory vibration diagnosis on a lift, observe the following
precautions:


WARNING: If only one drive wheel is allowed to rotate, speed must be limited to 55 km/h (35 miles/h) indicated on the
speedometer since actual wheel speed will be twice that indicated on the speedometer. Speed exceeding 55 km/h (35 miles/h)
or allowing the drive wheel to hang unsupported could result in tire disintegration, differential failure, constant velocity joint

Front Suspension (204-01 Front Suspension, Description and Operation), Front Suspension (204-01 Front Suspension, Description and Operation), Rear Suspension (204-02 Rear Suspension, Description and Operation), Rear Suspension (204-02 Rear Suspension, Description and Operation), Rear Suspension (204-02 Rear Suspension, Description and Operation).
Inspection and Verification

1. Verify the customer concern by carrying out a road test on a smooth road. If any vibrations are apparent, refer to
section 100-04 Noise, Vibration and Harshness.
2. Visually inspect for obvious signs of damage and system integrity.



3. If an obvious cause for an observed or reported condition is found, correct the cause (if possible) before proceeding to
the next step.
4. If the fault is not visually evident, verify the symptom and refer to the following Symptom Chart.

Symptom Chart

Symptom Possible Sources Action Crabbing * Incorrect rear thrust angle. * Check the rear toe adjustment.
REFER to: Rear Toe Adjustment (204-00 Suspension System - General Information, General Procedures). * Front or rear suspension components.
* Inspect the front and rear suspension systems. Repair or
install new suspension components as necessary. * Drive axle damaged. * Install a new rear drive axle/differential.
REFER to: Axle Assembly - V6 3.0L Petrol (205-02 Rear Drive Axle/Differential, Removal and Installation). Drift/Pull * Unequal tire pressure.
* Check and adjust the tire pressures. Inspect the tire for
excessive wear.
REFER to: Specifications (204-04 Wheels and Tires, Specifications). * Incorrect wheel alignment.
* Check and adjust the wheel alignment. REFER to:
(204-00 Suspension System - General Information)
Front Toe Adjustment (General Procedures), Rear Toe Adjustment (General Procedures), Camber and Caster Adjustment (General Procedures). * Tires.
* Check and adjust the tire pressures. Inspect the tire for
excessive wear.
REFER to: Specifications (204-04 Wheels and Tires, Specifications). * Unevenly loaded or overloaded vehicle. * Notify the customer of incorrect vehicle loading. * Damaged steering components. * Check the steering system. * Brake drag. * Check the brakes.
REFER to: Brake System (206-00 Brake System - General Information, Diagnosis and Testing). Mechanical

Damaged tires
Wheel bearing(s)
Loose or damaged front or rear suspension components
Loose, damaged or missing suspension fastener(s)
Incorrect spring usage
Damaged or sagging spring(s)
Damaged or leaking shock absorber(s)
Damaged or leaking strut(s)
Worn or damaged suspension bushing(s)
Loose, worn or damaged steering system components
Damaged axle components Visual Inspection Chart

Removal and Installation),
Shock Absorber and Spring Assembly (204-02 Rear Suspension, Removal and Installation). Incorrect Tire Wear
* Incorrect tire pressure (rapid center rib
or inner and outer edge wear). * Check and adjust the tire pressure. Inspect the tire for
excessive wear.
REFER to: Specifications (204-04 Wheels and Tires, Specifications). * Excessive front or rear toe (rapid inner
or outer edge wear). * Check and adjust the wheel alignment. REFER to:
(204-00 Suspension System - General Information)
Front Toe Adjustment (General Procedures), Rear Toe Adjustment (General Procedures), Camber and Caster Adjustment (General Procedures). * Excessive negative or positive camber
(rapid inner or outer edge wear). * Check and adjust the wheel alignment. REFER to:
(204-00 Suspension System - General Information)
Front Toe Adjustment (General Procedures), Rear Toe Adjustment (General Procedures), Camber and Caster Adjustment (General Procedures). * Tires out of balance (tires cupped or dished). * Balance the tires. Rough ride * Spring(s)
* Check and install new spring(s) as necessary. REFER to:
Front Shock Absorber (204-01 Front Suspension, Removal and Installation),
Shock Absorber and Spring Assembly (204-02 Rear Suspension, Removal and Installation). Shimmy or Wheel Tramp * Loose wheel nut(s).
* Check and tighten the wheel nuts to specification.
REFER to: Specifications (204-04 Wheels and Tires, Specifications). * Loose front suspension fasteners.
* Check and tighten the suspension fasteners to
specification.
REFER to: Specifications (204-00 Suspension System - General Information, Specifications). * Front wheel bearing(s). * Check the wheel bearings. * Worn or damaged suspension component bushing. * Check and install new components as necessary. * Wheel/tires.
* Check the wheels/tires. Balance or install new
wheel/tires as necessary.
REFER to: Wheels and Tires (204-04 Wheels and Tires, Diagnosis and Testing). * Loose, worn or damaged ball joint(s). * Check the Ball Joint(s). * Loose, worn or damaged steering components. * Check and install new components as necessary. * Front wheel alignment.
* Check and adjust the wheel alignment. REFER to:
(204-00 Suspension System - General Information)
Front Toe Adjustment (General Procedures), Rear Toe Adjustment (General Procedures), Camber and Caster Adjustment (General Procedures). * Shock absorber(s). * Check and install new shock absorber(s) as necessary.
REFER to:
Front Shock Absorber (204-01 Front Suspension, Removal and Installation),
Shock Absorber and Spring Assembly (204-02 Rear Suspension, Removal and Installation). * Spring(s).
* Check and install new springs as necessary. REFER to:
Front Shock Absorber (204-01 Front Suspension, Removal and Installation),
Shock Absorber and Spring Assembly (204-02 Rear Suspension, Removal and Installation). Poor self center action of
the steering * Ball joints. * Check the Ball Joints. * Steering components. * Check and install new components as necessary. Steering wheel off-center * Unequal front or rear toe settings.
* Check and adjust the wheel alignment. REFER to:
(204-00 Suspension System - General Information)
Front Toe Adjustment (General Procedures), Rear Toe Adjustment (General Procedures), Camber and Caster Adjustment (General Procedures). * Steering components. * Check and install new components as necessary. Sway or roll
* Overloaded, unevenly or incorrectly
loaded vehicle. * Notify the customer of incorrect vehicle loading. * Loose wheel nut(s).
* Check and tighten the wheel nut(s) to specification.
REFER to: Specifications (204-04 Wheels and Tires, Specifications). * Coil spring(s).
* Check and install new coil springs as necessary. REFER
to:
Front Shock Absorber (204-01 Front Suspension, Removal and Installation),

Shock Absorber and Spring Assembly (204-02 Rear Suspension, Removal and Installation). * Loose front stabilizer bar or rear
stabilizer bar. * Check and tighten the stabilizer bar to specification.
REFER to:
Specifications (204-01 Front Suspension, Specifications), Specifications (204-02 Rear Suspension, Specifications). * Worn lower suspension arm stabilizer
bar insulators. * Install new lower suspension arm stabilizer bar as
necessary. REFER to:
Front Stabilizer Bar - 2.7L Diesel (204-01, Removal and
Installation),
Front Stabilizer Bar - V6 3.0L Petrol (204-01 Front Suspension, Removal and Installation),
Front Stabilizer Bar - 4.2L (204-01, Removal and
Installation),
Rear Stabilizer Bar (204-02 Rear Suspension, Removal and Installation). * Shock absorber(s). * Check and install new shock absorber(s) as necessary.
REFER to:
Front Shock Absorber (204-01 Front Suspension, Removal and Installation),
Shock Absorber and Spring Assembly (204-02 Rear Suspension, Removal and Installation). Vehicle Leans to One
Side * Unevenly loaded or overloaded vehicle. * Notify the customer of incorrect vehicle loading. * Front or rear suspension components.
* Inspect the front and rear suspension systems. Repair or
install new suspension components as necessary. * Shock absorber(s). * Check and install new shock absorber(s) as necessary.
REFER to:
Front Shock Absorber (204-01 Front Suspension, Removal and Installation),
Shock Absorber and Spring Assembly (204-02 Rear Suspension, Removal and Installation). * Coil spring(s).
* Check and install new spring(s) as necessary. REFER to:
Front Shock Absorber (204-01 Front Suspension, Removal and Installation),
Shock Absorber and Spring Assembly (204-02 Rear Suspension, Removal and Installation). * Incorrect ride height. Lateral tilt out of
specification. * Check the ride height. Install new spring(s) as
necessary. REFER to:
Front Shock Absorber (204-01 Front Suspension, Removal and Installation),
Shock Absorber and Spring Assembly (204-02 Rear Suspension, Removal and Installation). Vibration/Noise * Tires/wheels.
* Wheel bearings.
* Wheel hubs.
* Brake components.
* Suspension components.
* Steering components. * Check and install new components as necessary. Wander * Unevenly loaded or overloaded vehicle. * Notify the customer of incorrect vehicle loading. * Ball joint(s). * Check the Ball Joint(s). * Front wheel bearing(s). * Check the wheel bearings. * Loose, worn or damaged suspension components. * Check and install new suspension components as necessary. * Loose suspension fasteners.
* Check and tighten the suspension fasteners to
specification.
REFER to: Specifications (204-00 Suspension System - General Information, Specifications). * Steering components. * Check and install new steering components. * Wheel alignment (excessive total front
toe-out). * Check and adjust the wheel alignment. REFER to:
(204-00 Suspension System - General Information)
Front Toe Adjustment (General Procedures), Rear Toe Adjustment (General Procedures), Camber and Caster Adjustment (General Procedures). Component Tests

Ball Joint Inspection


NOTE: The front suspension is shown in the following procedures. The inspection of the rear suspension upper ball joint
is similar.

1. Raise and support the vehicle. REFER to: (100-02 Jacking and Lifting)
Jacking (Description and Operation), Lifting (Description and Operation).
2. Prior to carrying out any inspection of the ball joints, inspect the front wheel bearings.

Published: 16-Oct-2013
Suspension System - General Information - Front Toe Adjustment
General Procedures
CAUTIONS:

Make sure the vehicle is on a flat level surface.
Make sure the tire pressures are within specification.
Make sure that only the manufacturers' recommended four wheel alignment equipment is used.
Make sure the steering is in the straight ahead position.
1. For wheel alignment information, refer to the suspension specification
section.
For additional information, refer to: Specifications (204-00 Suspension System - General Information, Specifications).

2. Check the tie rod ends, suspension joints, wheel bearings and wheels
and tires for damage, wear and free play.
Adjust or repair any worn, damaged or incorrectly adjusted
components.

3. Check and adjust tire pressures.

4. Position the vehicle on a 4 post lift.

5. Release the vehicle parking brake.

6. Vehicles with air suspension.
For additional information, refer to: Air Suspension Manual Tight
Tolerance Setting Mode (204-05, General Procedures).

7. For additional information, refer to: Air Suspension Manual Tight
Tolerance Setting Mode (204-05, General Procedures).

8. Using only four-wheel alignment equipment approved by Jaguar, check
the wheel alignment.


9. NOTE: LH illustration shown, RH is similar. To
adjust, loosen the tie rod end lock nuts.

Upper Control Arm
The forged-aluminum upper control arm is a wishbone design and connects to the vehicle body through two plain bushes, and
links to the swan neck wheel knuckle by an integral ball joint. The upper control arm is inclined to provide anti-dive
characteristics under heavy braking, while also controlling geometry for vehicle straight-line stability.

Lower Control Arm

The forged aluminum lower control arms are of the wishbone design; the arms separate to allow for optimum bush tuning:

The rear lateral control arm is fitted with a bush at its inner end which locates between brackets on the subframe. The
arm is secured with an eccentric bolt which provides the adjustment of the suspension camber geometry. The outer end
of the control arm has a tapered hole which locates on a ball joint fitted to the wheel knuckle. An integral clevis bracket
on the forward face of the lateral control arm allows for the attachment of the forward control arm. A bush is fitted
below the clevis bracket to provide for the attachment of the stabilizer bar link. A cross-axis joint is fitted to a
cross-hole in the control arm to provide the location for the clevis attachment of the spring and damper assembly.
The forward control arm is fitted with a fluid-block rubber bush at its inner end which locates between brackets on the
subframe. The arm is secured with an eccentric bolt which provides adjustment of the castor and camber geometry. The
outer end of the control arm is fitted with a cross-axis joint and locates in the integral clevis bracket on the lateral
control arm.

Wheel Knuckle

The cast aluminum wheel knuckle is a swan neck design and attaches to the upper control arm and lower lateral control arm.
The lower lateral control arm locates on a non serviceable ball-joint integral with the wheel knuckle. The lower boss on the
rear of the knuckle provides for the attachment of the steering gear tie-rod ball joint.
The wheel knuckle also provides the mounting locations for the:
wheel hub and bearing assembly
the wheel speed sensor (integral to the wheel hub and bearing assembly)
brake caliper and disc shield.

Stabilizer Bar

The stabilizer bar is attached to the front of the subframe with bushes and mounting brackets. The pressed steel mounting
brackets locate over the bushes and are attached to the cross member with bolts screwed into threaded locations in the
subframe. The stabilizer bar has crimped, 'anti-shuffle' collars pressed in position on the inside edges of the bushes. The
collars prevent sideways movement of the stabilizer bar.

The stabilizer bar is manufactured from 32mm diameter tubular steel on supercharged models and 31mm diameter tubular
steel on diesel and normally aspirated models and has been designed to provide particular characteristics in maintaining roll
rates, specifically in primary ride comfort.

Each end of the stabilizer bar curves rearwards to attach to a ball joint on a stabilizer link. Each stabilizer link is secured to a
bush in the lower lateral arm with a bolt and locknut. The links allow the stabilizer bar to move with the wheel travel providing
maximum effectiveness.

The only difference between the front stabilizer bars, in addition to the diameter, is in the shape to accommodate engine
variant:

a slightly curved bar, between bush centers, for V6 diesel (31 mm dia) and V8 gasoline supercharged (32 mm dia),
a straight bar, between bush centers, for V6 and V8 normally aspirated gasoline engines (31 mm dia).
Spring and Damper Assembly

The spring and damper assemblies are located between the lower lateral arm and the front suspension housing in the inner
wing. Dependant on vehicle model there are three types of coil spring and damper available:
a standard oil passive damper (All models except supercharged),
an adaptive damper, also known as Computer Active Technology Suspension (CATS) on 4.2L supercharged vehicles up to
2010MY, For additional information refer to Vehicle Dynamic Suspension 4.2L.
a continuously variable adaptive damper, also known as Adaptive Dynamics System on 5.0L supercharged vehicles from
2010MY. For additional information refer to Vehicle Dynamic Suspension 5.0L.

The dampers are a monotube design with a spring seat secured by a circlip onto the damper tube. The damper's lower
spherical joint is an integral part of the lateral lower control-arm, and the damper takes the form of a clevis-end, which
straddles the spherical joint.

The damper piston is connected to a damper rod which is sealed at its exit point from the damper body. The threaded outer
end of the damper rod locates through a hole in the top mount. A self locking nut secures the top mount to the damper rod.
The damper rod on the adaptive damper has an electrical connector on the outer end of the damper rod.

Supercharged 4.2L vehicles up to 2010MY: The adaptive damper functions by restricting the flow of hydraulic fluid through
internal galleries in the damper's piston. The adaptive damper has a solenoid operated valve, which when switched allows a
greater flow of hydraulic fluid through the damper's piston. This provides a softer damping characteristic from the damper. The
adaptive damper defaults to a firmer setting when not activated. The solenoid is computer controlled and can switch between
soft and hard damping settings depending on road wheel inputs and vehicle speed.

Supercharged 5.0L vehicles from 2010MY: The variable damper functions by adjustment of a solenoid operated variable orifice,
which opens up an alternative path for oil flow within the damper. When de-energized the bypass is closed and all the oil flows

each damper to the appropriate level to maintain a flat and level body.
Roll Rate Control – Uses CAN inputs. Predicts vehicle roll rate due to driver steering inputs 100 times a second and increases damping to reduce roll rate.
Pitch Rate Control – Uses CAN inputs. Predicts vehicle pitch rate due to driver throttle and braking inputs 100 times a second and increases damping to reduce pitch rate.
Bump Rebound Control – Uses suspension height sensor and CAN inputs. Monitors the position of the wheel 500 times a second and increases the damping rate as the damper approaches the end of its travel.
Wheel Hop Control – Uses suspension height sensor and CAN inputs. Monitors the position of the wheel 500 times a second and detects when the wheel is at its natural frequency and increases the dampingto reduce vertical wheel
motion.

Under normal road conditions when the vehicle is stationary with the engine running, the dampers are set to the firm condition
to reduce power consumption.

The adaptive damping module receives its power supply via a relay and fuse in the CJB. The relay remains energized for a period of time after the ignition is off. This allows the adaptive damping module to record and store any DTC (diagnostic
trouble code) relating to adaptive dynamics system faults.



DAMPERS Component Description



Item Description A Front spring and damper assembly B Rear spring and damper assembly The 'Adaptive Dynamics' dampers are monotube, nitrogen gas and oil filled units, manufactured by Bilstein. The dampers are
continuously variable, which allows the damping force to be electrically adjusted when the vehicle is being driven. The variable
dampers provide the optimum compromise between vehicle control and ride comfort.

The dampers have an electrical connector on the end of the piston rod, in the center of the top mount (the dampers look
identical to those on the Computer Active Technology Suspension (CATS) system of 4.2L supercharged vehicles, but have a
different part number).

In each damper, the continuous damping adjustment is achieved by a solenoid operated variable orifice, which opens up an
alternative path for oil flow within the damper. When de-energized the bypass is closed and all the oil flows through the main
(firm) piston. When energized, the solenoid moves an armature and control blade, which work against a spring. The control
blade incorporates an orifice which slides inside a sintered housing to open up the bypass as required. In compression, oil
flows from the lower portion of the damper through a hollow piston rod, a separate soft (comfort) valve, the slider housing and
orifice and into the upper portion of the damper, thereby bypassing the main (firm) valve. In rebound the oil flows in the www.JagDocs.com

Brake System - General Information - Brake System
Diagnosis and Testing

Principle of Operation Published: 11-May-2011

For a detailed description of the brake system, refer to the relevant Description and Operation sections in the workshop
manual. REFER to:

Front Disc Brake (206-03, Description and Operation),
Front Disc Brake (206-03, Description and Operation),
Front Disc Brake (206-03, Description and Operation),
Rear Disc Brake (206-04, Description and Operation),
Rear Disc Brake (206-04, Description and Operation),
Rear Disc Brake (206-04, Description and Operation),
Parking Brake (206-05 Parking Brake and Actuation, Description and Operation), Parking Brake (206-05 Parking Brake and Actuation, Description and Operation), Parking Brake (206-05 Parking Brake and Actuation, Description and Operation), Hydraulic Brake Actuation (206-06 Hydraulic Brake Actuation, Description and Operation), Hydraulic Brake Actuation (206-06 Hydraulic Brake Actuation, Description and Operation), Hydraulic Brake Actuation (206-06 Hydraulic Brake Actuation, Description and Operation), Brake Booster (206-07 Power Brake Actuation, Description and Operation), Brake Booster (206-07 Power Brake Actuation, Description and Operation), Brake Booster (206-07, Description and Operation).

Inspection and Verification

Visually examine the front and rear wheel and tire assemblies for damage such as uneven wear patterns, tread worn out or
sidewall damage. Verify the tires are the same size, type and, where possible, same manufacturer. Replace the damaged
wheel or excessively worn tire.
Wheels and tires must be cleared of any foreign matter and tire pressures adjusted to the correct specification.

If the tires exhibit uneven wear or feathering, the cause must be corrected. Check the steering and suspension components for
damage or wear and, if necessary, check and adjust front wheel alignment. REFER to: (204-00 Suspension System - General
Information)
Specifications (Specifications), Front Toe Adjustment (General Procedures).
Visual Inspection
Mechanical Electrical
Brake master cylinder
Brake caliper piston(s)
Brake discs
Wheel bearings
Brake pads
Power brake booster
Brake pedal linkage
Brake booster vacuum hose
Tires
Debris
Parking brake actuator
Parking brake module
Parking brake switch
Damaged or corroded wiring harness
Brake master cylinder fluid level switch Road Test

Carry out a road test to compare actual vehicle braking performance with the performance standards expected by the driver.
The ability of the test driver to make valid comparisons and detect performance deficiencies will depend on experience.

The driver should have a thorough knowledge of brake system operation and accepted general performance guidelines to make
good comparisons and detect performance concerns.

An experienced brake technician will always establish a route that will be used for all brake diagnosis road tests. The roads
selected will be reasonably smooth and level. Gravel or bumpy roads are not suitable because the surface does not allow the
tires to grip the road equally. Crowned roads should be avoided because of the large amount of weight shifted to the low set
of wheels on this type of road. Once the route is established and consistently used, the road surface variable can be
eliminated from the test results.

Before a road test, obtain a complete description of the customer concerns or suspected condition. From the description, the
technician's experience will allow the technician to match possible causes with symptoms. Certain components will be tagged
as possible suspects while others will be eliminated by the evidence. More importantly, the customer description can reveal
unsafe conditions which should be checked or corrected before the road test. The description will also help form the basic
approach to the road test by narrowing the concern to specific components, vehicle speed or conditions.

Begin the road test with a general brake performance check. Keeping the description of the concern in mind, test the brakes at
different vehicle speeds using both light and heavy pedal pressure. To determine if the concern is in the front or rear braking
system, use the brake pedal and then use the parking brake control. If the condition (pull, vibration, pulsation) occurs only
with the parking brake, the concern is in the rear brake system.