traction control JAGUAR XFR 2010 1.G Workshop Manual

Air Conditioning A/C Accelerator Pedal Position APP
Is a multitrack sensor which inputs the drivers demand into the engine
control module (ECM) After Bottom Dead Center ABDC Event occurring after bottom dead center After Top Dead Center ATDC Event occurring after top dead center Anti-lock Brake System ABS
System which prevents wheel lock-up under braking by sensing lack of
rotation of a wheel(s) and diverting fluid pressure away from it (them) Alternating Current ac Amplitude Modulation AM Automatic Temperature Control ATC Automatic Transmission Fluid ATF Ampere A SI unit of current Ampere hour Ah Barometric Pressure BARO Pressure of surrounding air at any given temperature and altitude Battery positive voltage B+ The positive voltage from a battery or any circuit connected directly to it Before Bottom Dead Center BBDC Event occurring before bottom dead center Before Top Dead Center BTDC Event occurring before top dead center Bottom Dead Center BDC Lowest point of piston travel in a reciprocating engine Battery Junction Box BJB Brake Pedal Position BPP Brake Horsepower BHP
Effective horsepower developed by an engine or motor, as measured by a
brake applied to its output shaft British Standard BS Standard specification issued by the British Standards Institution Brake Traction Control System BTCS

Programmable Read-only Memory PROM ROM with some provision for setting the stored data after manufacture Portable Support Electronics PSE Power Steering Pressure PSP Polytetrafluoroethylene PTFE Random Access Memory RAM
Fast access memory store which is accessible for entry or extraction of
data Read Only Memory ROM Fast access memory in which data is fixed and may not be changed Restraints Control Module RCM
Electronic module to support functionality of the Supplemental Restraints System Radio Data System RDS Rear Electronic Module REM Remote Keyless Entry RKE Right-hand RH Right-hand drive RHD Research Octane Number RON Rear Seat Module RSM Electronic module to support functionality of rear seats Supercharger SC
An intake system which utilizes a supercharger (mechanically driven
device that pressurizes intake air, thereby increasing density of charge air
and the consequent power output from a given displacement) Serial Communications Link SCL Standard Corporate Protocol SCP
A high-speed, serial communications system linking all body system
control modules. Control messages and data are passed between modules
at up to 786 messages per second Supplemental Restraints System SRS
Shift Solenoid SS Controls shifting in an automatic transmission Seat Control Module SCM
Module controlling the seat motor systems (not electric raise/lower-only seats) Secondary Air Injection AIR
System used for a period of time each time the engine is started, unless
certain temperature criteria are met. Pumps air directly into the exhaust
system which generates extra heat and reduces the time taken for the catalytic converters to reach operating temperature Service Repair Operation
(number) SRO
Number generated by Jaguar Methods & Techniques system which relates
to the time allowed to complete a repair operation. Further information on
the system can be found in the separate Jaguar Publications (for each
model range) entitled 'Repair Operation Times' Society of Automotive Engineers SAE
Timing/Coast Clutch Solenoid T/CCS Torque Converter Clutch TCC Transmission Control Indicator
Lamp TCIL
Throttle Position TP Top Dead Center TDC Transmission Control Module TCM Controls the shifting pattern of the (automatic) transmission Transmission Control Switch TCS Modifies the operation of electronically controlled transmissions Transmission Fluid Temperature TFT Indicates temperature of transmission fluid Transmission Range TR The range in which the transmission is operating Turbine Shaft Speed TSS Indicates rotational speed of transmission output shaft or turbine shaft Variable Assist Power Steering VAPS Variable Camshaft Timing VCT
A system by which the relationship of the crankshaft and camshaft may be
altered during engine running Vehicle Identification Number VIN
Number assigned to the vehicle by the manufacturer, primarily for licensing and identification purposes Vehicle Speed Sensor VSS Sensor which provides vehicle speed information Worldwide Diagnostic System WDS Jaguar approved diagnostic system Wide Open Throttle WOT Full throttle position www.JagDocs.com

Do not empty fuel while working in a workshop or a pit
Ensure that working area is well ventilated
Ensure that any work on the fuel system is only carried out by experienced and well qualified maintenance personnel
Ensure that fume extraction equipment is used where appropriate


Fume extraction equipment must be in operation when solvents are used e.g. Trichloroethane, white spirit, sbp3,
methylene chloride, perchlorethylene. Do not smoke in the vicinity of volatile degreasing agents.

Whenever possible, use a ramp or pit whilst working beneath a vehicle, in preference to jacking. Position chocks at the wheels
as well as applying the parking brake. Never rely on a jack alone to support a vehicle. Use axle stands, or blocks carefully
placed at the jacking points, to provide a rigid location. Check that any lifting equipment used has adequate capacity and is
fully serviceable. Ensure that a suitable form of fire extinguisher is conveniently located. When using electrical tools and
equipment, inspect the power lead for damage and check that it is properly earthed. Disconnect the earth (grounded) terminal
of the vehicle battery. Do not disconnect any pipes of the air conditioning refrigeration system unless you are trained and
instructed to do so. A refrigerant is used which can cause blindness if allowed to come into contact with the eyes. Ensure that
adequate ventilation is provided when volatile degreasing agents are being used.

Adhere strictly to handling and safety instructions given on containers and labels. Keep oils and solvents away from naked
flames and other sources of ignition. Do not apply heat in an attempt to free seized nuts or fittings; as well as causing
damage to protective coatings, there is a risk of damage from stray heat to electronic equipment and brake lines. Do not leave
tools, equipment, spilt oil etc. around the work area. Wear protective overalls and use barrier cream when necessary.

Environmental Protection

In some countries it is illegal to pour used oil onto the ground, down sewers or drains, or into water courses. The burning of
used engine oil in small space heaters or boilers is not recommended unless emission control equipment is installed. Dispose
of used oil through authorized waste disposal contractors, to licensed waste disposal sites or to the waste oil reclamation
trade. If in doubt, contact the Local Authority for advice on disposal facilities.

General Information - Solvents, Sealants and Adhesives
Description and Operation Published: 11-May-2011

WARNING: Always handle all solvents, sealers and adhesives with extreme care. Some contain chemicals or give off
fumes which can be dangerous to health. Always follow the manufacturers instructions. If in doubt about any substance,
particularly a solvent, DO NOT use it.


CAUTION: If in doubt about the suitability of any proprietary solvent or sealer for a particular application, contact the
manufacturer of the product for information regarding storage, handling and application.

The Solvents, Sealers and Adhesives subsection refers to some commonly used chemicals and materials, hazards associated
with their use, and safety measures to be taken.

Adhesives and Sealers

Highly flammable, flammable, combustible – observe No Smoking policy.

Generally should be stored in No Smoking' areas. Cleanliness and tidiness in use should be observed e.g. disposable paper
covering benches; should be dispensed from applicators where possible; containers, including secondary containers, should be
labelled appropriately.

Solvent - based Adhesives/Sealers - See Solvents

Follow manufacturer's instructions.

Water - based Adhesives/Sealers

Those based on polymer emulsions and rubber latexes may contain small amounts of volatile toxic and harmful chemicals. Skin
and eye contact should be avoided and adequate ventilation provided during use.

Hot Melt Adhesives

In the solid state, they are safe. In the molten state they may cause burns and health hazards may arise from the inhalation
of toxic fumes.
Use appropriate protective clothing and a thermostatically controlled heater with a thermal cut - out and adequate extraction.

Resin - based Adhesives/Sealers e.g. Epoxide and Formaldehyde Resin - based

Mixing should be carried out in well ventilated areas, as harmful or toxic volatile chemicals may be released.

Skin contact with uncured resins and hardeners can result in irritation, dermatitis, and absorption of toxic or harmful chemicals
through the skin. Splashes can damage the eyes.
Provide adequate ventilation and avoid skin and eye contact.

Anaerobic, Cyanoacrylate (Super - glues) and other Acrylic Adhesives Many are irritant, sensitizing or harmful to the skin and/or respiratory tract. Some are eye irritants.
Skin and eye contact should be avoided and the manufacturer's instructions followed.
Cyanoacrylate adhesives (super-glues) MUST NOT contact the skin or eyes. If skin or eye tissue is bonded, cover with a clean
moist pad and seek immediate medical attention. Do not attempt to pull tissue apart. Use in well ventilated areas as vapors
can cause irritation to the nose and eyes.
For two - pack systems see Resin - based and Isocyanate Adhesives/Sealers.

Isocyanate (Polyurethane) Adhesives/Sealers

See also Resin - based Adhesives

Individuals suffering from asthma or respiratory allergies should not work with or near these materials as sensitivity reactions
can occur.

Over exposure is irritating to the eyes and respiratory system. Excessive concentrations may produce effects on the nervous
system including drowsiness. In extreme cases, loss of consciousness may result. Long term exposure to vapor concentrations
may result in adverse health effects.
Prolonged contact with the skin may lead to skin irritation and, in some cases, dermatitis.
Splashes entering the eye will cause discomfort and possible damage.
Any spraying should preferably be carried out in exhaust ventilated booths removing vapors and spray droplets from the
breathing zone.
Wear appropriate gloves, eye and respiratory protection.

Published: 11-May-2011
Ride and Handling Optimization - Ride and Handling Optimization - Overview
Description and Operation

OVERVIEW

JaguarDrive Control is a selectable vehicle optimisation system, designed to fine-tune the driving characteristics of the vehicle
by accommodating different driving conditions or driving styles. The system allows the performance envelope of the vehicle to
be stretched and prevents the necessity for a single, compromised configuration for all conditions. JaguarDrive Control
increases the vehicle's abilities by changing the characteristics of engine mapping, transmission shifts and stability and
traction interventions. The software for the JaguarDrive control is incorporated in the JaguarDrive selector module.


NOTE: The JaguarDrive Control system is a co-ordinating system only. It CANNOT generate a fault in one of the
participating sub-systems. All participating subsystems should be FULLY diagnosed before assuming a fault with JaguarDrive
Control. Replacing the JaguarDrive selector module should not be done until all other options have been exhausted.
www.JagDocs.com

Published: 11-May-2011
Ride and Handling Optimization - Ride and Handling Optimization - System
Operation and Component Description
Description and Operation



JAGUARDRIVE CONTROL OPERATION

Engine Management System System Operation

The Engine Management System (EMS) varies the accelerator pedal maps to change the amount of torque per percentage of
pedal travel. The EMS can also change the accelerator pedal response to control the allowed torque change relative to the
speed of pedal travel.

Each driving mode uses a combination of operating parameters for each sub-system. Changing between driving modes initiates
a different set of operating characteristics, which will be noticeable to the driver. The driver will notice differences in engine
response when, for example, the accelerator pedal is held in a constant position and the driving mode is changed from Winter
to Dynamic, the driver will notice the torque and engine speed increase. Similarly, if the mode is changed from Normal or
Dynamic to Winter the driver will notice a reduction in torque and engine speed.


NOTE: The change in torque and engine speed can take approximately 30 seconds and care must be taken not to confuse
the JaguarDrive Control system operation with an EMS fault.
Transmission Control

The TCM (transmission control module) changes the shift maps for the JaguarDrive Control mode selected. This changes the
shift points providing early or late upshifts and downshifts. For example, on slippery surfaces in Winter mode the transmission
will select 2nd gear for starting from a standstill on a flat surface to minimize wheel slip.
Anti-lock Braking System Control

The ABS (anti-lock brake system) module controls several vehicle functions and adjusts the operating parameters of these
functions to optimize the selected JaguarDrive Control mode. Traction control uses different slip/acceleration thresholds to
improve traction and vehicle composure. For example, the system sensitivity is increased on slippery surfaces to reduce wheel
spin.

If TracDSC is selected or DSC is switched off, then subsequently the JaguarDrive Control mode is changed, DSC is automatically
switched back on (or to TracDSC for Dynamic mode).

The stability control uses different threshold values for the selected mode, reducing the requirement for the driver to change
the DSC system mode for optimum performance in various driving scenarios.
Incorrect Mode Usage

Selection of an inappropriate mode is discouraged in the following ways:

The active mode icon is continually displayed in the instrument cluster message center
In any special mode, when the ignition has been in the off position continuously for more than 6 hours, the JaguarDrive
Control system defaults to the special modes off (DSC on).

Selection of an inappropriate mode for the conditions will not endanger the driver or immediately cause damage to the vehicle.
Continued use of an inappropriate mode may reduce the life of some components. The driver may notice a different vehicle
response, with the engine and transmission responses being different than in the special modes off.
Driver Information

The instrument cluster contains a message center, which displays vehicle information to the driver. The message center
contains the JaguarDrive Control mode icons, which display the currently selected mode. If no symbol is displayed, no special
mode is selected and the system is in special modes off.

Any required changes to the subsystems are also passed to the driver in the form of warning illumination in the instrument
cluster or appropriate messages in the message center, DSC off for example.

In Dynamic mode when the transmission is in manual mode, the gear information is displayed in amber when the appropriate
engine speed is reached for optimum sporty change point.

DIAGNOSTICS

JaguarDrive Control relies on the correct functionality of the sub-systems. If one of the sub-systems develops a fault, the
JaguarDrive Control system will not function, even though the fault is not in the JaguarDrive Control system.

The JaguarDrive Selector module and rotary control should only be investigated if there are no apparent faults in any of the
sub-systems. If a fault in a sub-system is subsequently corrected, the JaguarDrive Control system will function normally after
an ignition on and off cycle.

6 Oil temperature sensor 7 High speed CAN from suspension control module 8 CJB (central junction box)
System Operation
















ELECTRONIC
DIFFERENTIAL
-
5.0L
SUPERCHARGER
VEHICLES
FROM
2010MY

The
multi-plate
clutch
prevents
excessive
differential
slip and
therefore
maximizes
the
traction
performance
of
the
vehicle.
This
is
fundamentally
different
from
'braked'
traction
control
systems,
which
can
only
counteract
differential
slip when it
occurs.

A
certain
amount
of
differential
slip is
required
to
allow
the
vehicle
to
turn
corners
and
to
remain
stable
under
control
of
the
ABS
(anti-lock
brake
system).
The
system
is
completely
automatic and
does
not
require
any
special
driver
input.

The
multi-plate
clutch
actively
controls
the
torque
flow
through
the
differential
and
optimizes
the
torque
distribution in
the
driveline.
The
clutch
biases
the
torque
from
the
differential
to
the
wheel
with the
higher
grip
and prevents
the
wheel
with the
lower
grip
from
spinning.

www.JagDocs.com

ELECTRONIC DIFFERENTIAL - 5.0L SUPERCHARGER - VEHICLES FROM 2010MY










































Item Description 1 Cover 2 LH rear drive halfshaft oil seal 3 Filler/Level plug 4 Temperature sensor 5 Motor 6 Input flange 7 Front mounting points with insulator assemblies 8 Carrier 9 Rear mounting points 10 Breather 11 RH rear drive halfshaft oil seal 12 Magnetic drain plug The electronic differential has the same functionality as the open differential, but it also incorporates a locking and torque
biasing function to give improved traction performance and vehicle dynamic stability. Operation of the electronic differential is
controlled by the Differential Locking Module (DLM).

Published: 11-May-2011
Anti-Lock Control - Stability Assist - Anti-Lock Control - Stability Assist - Overview
Description and Operation

Overview

The ABS (anti-lock brake system) and DSC (dynamic stability control) system features a Bosch modulator, which is an
integrated four-channel HCU (hydraulic control unit) and ABS module. The unit is located in the rear of the engine compartment on the passenger side, and is installed in the brake hydraulic circuit between the brake master cylinder and the four brake
calipers.

The ABS module is connected to the high speed CAN (controller area network) bus, and actively interacts with other vehicle system control modules and associated sensors to receive and transmit current vehicle operating information.

When required, the ABS module will actively intervene and operate the HCU during braking or vehicle maneuvers to correct the vehicle attitude, stability, traction or speed. During incidents of vehicle correction, the ABS module may also request the ECM (engine control module) to control engine power in order to further stabilize and correct the vehicle.
To provide full system functionality, the ABS and DSC system comprise the following components: DSC switch.
Four wheel speed sensors.
Steering angle sensor.
Yaw rate and lateral acceleration sensor.
Stoplamp switch.
Instrument cluster indicator lamps.
Integrated ABS module and HCU. Brake booster vacuum sensor (3.0L vehicles only).

Two variants of ABS module are available, Bosch ESP®8.1 and Bosch ESP®plus8.1. The Bosch ESP®plus8.1 system is fitted to vehicles with ACC (adaptive cruise control) and incorporates a new feature to Jaguar known as 'electronic brake prefill'.

Electronic brake prefill, senses any rapid throttle lift off, activating a small brake hydraulic pressure build-up of approximately 3
to 5 bar (43.5 to 72.5 lbf/in²) in anticipation of the brakes being applied. This application produces a quicker brake pedal
response and consequently slightly shorter stopping distances. When the ECM detects rapid throttle lift off it signals the ABS module which controls the HCU to apply a low brake pressure to assist in a quicker brake application.

NOTE: All vehicles with ACC are supported by the Bosch ESP®plus8.1 system.

The ABS provides the following brake functions that are designed to assist the vehicle or aid the driver: ABS. DSC, including Trac DSC.
CBC (corner brake control).
EBD (electronic brake force distribution).
ETC (electronic traction control).
EBA (emergency brake assist).
EDC (engine drag-torque control).
Understeer control.
Electronic brake prefill (vehicles with ACC only).
Brake vacuum assist (3.0L vehicles only).

All the brake functions listed are automatically active when the ignition is in power mode and the engine is running. The DSC
system can be selected to off using the DSC switch.


WARNING: Although the vehicle is fitted with DSC, it remains the drivers responsibility to drive safely according to the
prevailing conditions.

7 Brake fluid level switch 8 LH rear wheel speed sensor 9 RH rear wheel speed sensor 10 RJB (rear junction box) 11 High mounted stop lamp 12 LH stop lamp 13 RH stop lamp 14 Diagnostic socket 15 TCM (transmission control module) 16 Electronic parking brake module 17 ECM (engine control module) 18 Instrument cluster 19 ABS (anti-lock brake system) module 20 JaguarDrive selector module 21 Adaptive damping control module 22 Adaptive speed control module 23 Yaw rate and lateral acceleration sensor 24 Roof opening panel motor/module 25 Brake booster vacuum sensor (3.0L vehicles only) 26 Steering angle sensor


Anti-Lock Brake System System Operation

ABS controls the speed of all road wheels to ensure optimum wheel slip when braking at the adhesion limit. The wheels are prevented from locking to retain effective steering control of the vehicle.

The brake pressures are modulated separately for each wheel. Rear brake pressures are controlled to maintain rear stability on
split friction surfaces.

Dynamic Stability Control

DSC (dynamic stability control) uses brakes and powertrain torque control to assist in maintaining the yaw stability of the
vehicle. While the ignition is energized the DSC function is permanently enabled, unless selected off using the DSC switch.

DSC enhances driving safety in abrupt maneuvers and in under-steer or over-steer situations that may occur in a bend. The
ABS module monitors the yaw rate and lateral acceleration of the vehicle, steering input and individual wheel speeds, then selectively applies individual brakes and signals for powertrain torque adjustments to reduce under-steer or over-steer
conditions.
In general:

In an under-steer situation the inner wheels are braked to counteract the yaw movement towards the outer edge of the
bend.
In an over-steer situation the outer wheels are braked to prevent the rear end of the vehicle from pushing towards the
outer edge of the bend.

The ABS module monitors the tracking stability of the vehicle using inputs from the wheel speed sensors, the steering angle sensor, and the yaw rate and lateral acceleration sensor. The tracking stability is compared with stored target data. Whenever
the tracking stability deviates from the target data, the ABS module intervenes by applying the appropriate control strategy. The following interactions occur in an intervention situation:

High speed CAN signal to the ECM, to reduce engine torque. Application of braking to the appropriate corner of the vehicle.
Trac DSC

TracDSC is an alternative setting of DSC with reduced system interventions. With TracDSC engaged, traction may be somewhat
increased, although stability may be reduced compared to normal DSC. TracDSC is intended for use only on dry tarmac, by
suitably experienced drivers and should not be selected for other surfaces or by drivers with insufficient skill and training to
operate the vehicle safely with the TracDSC function engaged.

The less restrictive TracDSC setting may be preferred, for example, by expert drivers engaged in high performance driving on
dry Tarmac surfaces such as tracks and circuits.
Switching between DSC and Trac DSC: