2010 JAGUAR XFR temperature

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.

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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).

A motor and reduction gearbox, attached to the cover.
A temperature sensor installed in the cover.

The DLM (differential locking module) operates the motor of the electronic differential under the control of the ADM (adaptive
damping module).
Exploded View of Electronic Differential



Item Description 1 Circlip 2 Bearing assembly 3 Input actuator 4 Actuator balls 5 Output actuator www.JagDocs.com

Thrust race 7 Shim 8 Thrust plate 9 Dished washer 10 Bolt (10 off) 11 Clutch basket 12 Multi-plate clutch and pressure disc 13 Differential case 14 Screw (2 off) 15 Bearing assembly 16 Oil seal 17 Oil slinger inner 18 Oil slinger outer 19 Input flange 20 Pinion nut 21 Collapsible spacer 22 Shim 23 Bearing assembly 24 Pinion shaft 25 Mounting insulator inner (2 off) 26 Mounting insulator rubber (2 off) 27 Mounting insulator outer (2 off) 28 Carrier 29 Oil seal 30 Drain plug 31 Vent 32 Breather cap 33 Shim 34 Bearing assembly 35 Drive gear 36 Shim 37 RH sun gear 38 Circlip 39 Thrust washer (4 off) 40 Planet gear (4 off) 41 Pin (2 off) 42 Shaft 43 LH sun gear 44 Shim 45 Bearing assembly 46 Shim 47 Dowel (2 off) 48 Bolt (4 off) 49 Reduction gear casing 50 Reduction gear 51 Shaft 52 Temperature sensor 53 O-ring seal 54 Motor 55 Screw (4 off) 56 Cover 57 Output actuator locking pin 58 Bolt (9 off)

60 Oil seal The multi-plate clutch is contained in a clutch basket attached to the differential carrier with the crown wheel securing bolts.
Alternate plates of the clutch pack are keyed to the clutch basket and the LH sun gear. A pressure disc is installed on the outer end of the clutch pack and keyed to the clutch basket. A thrust race on the end of the clutch basket incorporates lugs which
extend through the clutch basket onto the pressure disc.

The actuator assembly is mounted on bearings on the outboard end of the clutch basket, against the thrust race. The actuator
assembly consists of input and output actuators separated by five ball bearings. A locking pin in the cover engages with a slot
in the output actuator to prevent it turning, but allow it to move axially. The input actuator engages with the reduction gearbox
and is free to rotate relative to the cover. Ball bearings locate in curved grooves in the mating faces of the input and
output actuators. The bottom surface of each groove incorporates a ramp. Rotation of the input actuator forces the ball
bearings up the ramps in the grooves and induces an axial movement in the output actuator. The thrust race and pressure disc
transfer the axial movement from the output actuator to the clutch pack.



Item Description 1 Actuator 2 Multi-plate clutch 3 Differential The motor is a 12 V dc motor that adjusts the frictional loading of the multi-plate clutch, via the reduction gearbox and the
actuator assembly, under the control of the DLM. Adjusting the frictional loading of the multi-plate clutch adjusts the locking
torque between the crown wheel drive gear and the sun wheel.

Four bolts attach the motor to the reduction gearbox, which is located in position on the cover with two dowels, and secured
with four bolts. An O-ring seals the joint between the motor and the reduction gearbox.

The motor is driven by a 12 V dc feed direct from the DLM. The motor also incorporates the following connections with the
DLM:

A motor temperature sensor, to prevent excessive use from damaging the motor.
Two Hall effect motor position sensors, to enable closed loop control of the motor.

The temperature sensor provides a differential oil temperature signal to the DLM, to prevent excessive use from damaging the
multi-plate clutch.

Differential Locking Module (DLM)

The DLM controls operation of the electronic differential. The DLM is attached to a bracket located on the LH side of the luggage compartment, immediately forward of the fender tail lamp, behind the trim.

bus allows the DLM to communicate with other systems on the vehicle.

A certain amount of differential slip is required to allow the vehicle to turn corners and to remain stable under control of the
ABS. The ADM monitors the driver's demands through primary vehicle controls and automatically sets the slip torque in the differential. The system is completely automatic and does not require any special driver input.
The differential strategy in the ADM includes:

A pre-loading function, increasing locking torque with increased driving torque.
A slip controller to decrease locking torque for optimum comfort, e.g. parking.
The ADM memorizes the position of the motor when the ignition is switched off.

CAN bus messages used by the ADM include wheel speed, steering angle, automatic transmission speed, temperature information, car configuration, axle ratios and mode inputs.

The ADM also sends messages via the CAN bus to tell other control modules on the network the status of the electronic differential. The clutch torque and default mode status are some of the main signals sent out by the ADM.

If the DLM or ADM are replaced, a Jaguar approved diagnostic system must be connected to the vehicle and the differential
self-calibration procedure must be performed. This procedure must also be performed if the motor or electronic differential is
replaced.

If a fault occurs with the electronic differential, the ADM, the DLM, or one of the required input signals, the ADM records an
error code and displays a warning in the message center.
The following messages can be displayed:

Message Description Chime E-DIFF NOT
AVAILABLE Differential temperature has reached the overheat threshold. System deactivated until temperature
returns within limits. Single E-DIFF FAULT Fault has occurred with electronic differential. System deactivated until fault rectified. Single

Check for external brake system leaks. For additional information, refer to brake master cylinder component test in this section. Is there a leak present? Yes
Repair as necessary, add fluid and bleed brake system.
REFER to: Brake System Bleeding (206-00 Brake System - General Information, General Procedures). Re-test the system for normal operation.
No
No action required, system is OK.
PINPOINT TEST F : THE PEDAL GOES DOWN SLOWLY TEST
CONDITIONS DETAILS/RESULTS/ACTIONS F1: ROAD TEST VEHICLE - CHECK BRAKE PEDAL OPERATION 1 Check if the condition occurs during actual stopping application by applying the brake pedal while the vehicle is moving. Does the condition occur when the vehicle is moving? Yes
GO to F2. No
GO to F3. F2: CHECK FOR BRAKE SYSTEM LEAKS 1 Check for external brake system leaks. For additional information, refer to brake master cylinder component test in this section. Are there any external brake system leaks? Yes
Rectify as necessary. Add fluid and bleed the brake system.
REFER to: Brake System Bleeding (206-00 Brake System - General Information, General Procedures). Re-test the system for normal operation.
No
GO to F3. F3: CARRY OUT A BRAKE MASTER CYLINDER BYPASS TEST 1 Test for brake master cylinder bypass condition. Refer to Brake master cylinder component test in this section. Has a concern been identified? Yes
Install a new brake master cylinder, add fluid and bleed the brake system.
REFER to: Brake System Bleeding (206-00 Brake System - General Information, General Procedures). Re-test the system for normal operation.
No
No action required, system is OK.
PINPOINT TEST G : EXCESSIVE BRAKE PEDAL EFFORT TEST
CONDITIONS DETAILS/RESULTS/ACTIONS G1: CHECK BRAKE PADS 1 Check the brake pads for wear, contamination, correct installation, damage and type. Has a concern been identified?
Yes
Correctly install or install new brake pads as required. REFER to:
Brake Pads - Vehicles With: Standard Brakes (206-03A Front Disc Brake - V6 3.0L Petrol, Removal and Installation),
Brake Pads - Vehicles With: High Performance Brakes (206-03A Front Disc Brake - V6 3.0L Petrol, Removal and Installation),
Brake Pads (206-04A Rear Disc Brake - V6 3.0L Petrol, Removal and Installation), Brake Pads - Vehicles With: High Performance Brakes (206-04, Removal and Installation).
Re-test the system for normal operation.
No
GO to G2. G2: CHECK VACUUM 1 Disconnect the vacuum hose from the brake booster. 2 Connect a vacuum/pressure tester to the vacuum hose. 3 Run the engine at normal operating temperature. 4 Record the vacuum reading. Is the reading 40.5 kPa (12 in-Hg) or greater?
Yes
GO to G3. No
Locate and rectify the source of low vacuum. Re-test the system for normal operation. G3: INSPECT SYSTEM 1 Switch the engine off. 2 Reconnect the vacuum hose.

battery power supply to be passed via the slip ring assembly in the steering wheel to the heated steering wheel control
module. The steering wheel module supplies power to the steering wheel heater element and also monitors the temperature
via a NTC (negative temperature coefficient) temperature sensor incorporated into the heater element. The control module
varies the power supply to the element to maintain the steering wheel rim at the optimum temperature.

Component Description STEERING COLUMN MULTIFUNCTION SWITCHES
The steering column multifunction switches are situated on the steering column and consists of the wiper switch, the turn
signal indicator/lighting switch and the trip computer switch.

The steering column adjustment switch is located in the steering column lower shroud on the LH side. The switch is a 4 position 'joystick' which controls reach and rake adjustment.

Steering wheel mounted switches on the LH side of the driver's airbag, control the audio and telephone functions. Switches on the RH side of the driver's airbag, control the speed control functions. For additional information, refer to:
Audio System (415-01A Information and Entertainment System, Description and Operation), Speed Control (310-03A, Description and Operation),
Speed Control (310-03B, Description and Operation),
Speed Control (310-03C, Description and Operation).

Two transmission paddle switches are located at the rear of the steering wheel.
Refer to: External Controls (307-05, Description and Operation).
LH Multifunction Switch



Item Description 1 High beam 2 Lighting control rotary switch 3 RH turn signal indicator 4 Headlamp flash 5 LH turn signal indicator 6 Trip computer function button The LH multifunction switch controls the following windshield wiper functions: