2010 JAGUAR XFR brake

Published: 11-May-2011
Electronic Engine Controls - V8 S/C 5.0L Petrol - Powertrain Control Module
(PCM) Long Drive Cycle Self-Test
General Procedures


WARNING: Where possible, all road tests should be on well surfaced and dry roads. Always comply with speed limits and
local traffic regulations.
NOTES:


This procedure is an overcheck only. If fault codes are found, interrogation of the relevant system must be carried out and
claimed against.


The vehicle must exceed 50mph (80 km/h) during the road test.

1. Connect the diagnostic equipment to the vehicle.

2. Follow on screen prompts and check for engine management fault codes.

3. Clear the fault codes following the on screen procedure.

4. Disconnect the diagnostic equipment from the vehicle.


5. NOTE: Make sure cruise control is not engaged. Make sure
the engine temperature is above 60 ºC (140 ºF).
Carry out a road test and perform the following operations.
1. Accelerate to 55 mph (88 km/h) in 5th gear and cruise for 2
minutes with the engine speed at or above 1800rpm.
2. Lift off the throttle and allow the vehicle to decelerate until the
engine speed is less than 1000 rpm.
3. Stop the vehicle.
4. Release brake, allow the vehicle to move with no throttle for 1
minute.
5. Road test is now complete.

6. Connect the diagnostic equipment to the vehicle.


7. NOTE: If fault codes are found, interrogation of the relevant
system must be carried out and claimed against.
Follow on screen prompts and check for engine management fault codes.

8. Disconnect the diagnostic equipment from the vehicle.

TCM (transmission control module) 6 Diagnostic socket 7 Instrument cluster 8 JaguarDrive selector 9 Clockspring 10 Steering wheel audio switches 11 Downshift paddle switch 12 Upshift paddle switch 13 ECM (engine control module)


POWER FLOWS System Operation

Operation of the transmission is controlled by the TCM (transmission control module), which electrically activates various
solenoids to control the transmission gear selection. The sequence of solenoid activation is based on programmed information
in the TCM memory and physical transmission operating conditions such as vehicle speed, throttle position, engine load and JaguarDrive selector position.



Item Description 1 Torque input from engine 2 Torque converter lock-up clutch 3 Single web planetary gear carrier 4 Single web planetary gears 5 Single web sunwheel 1 6 Double web sunwheel 2 7 Double web planetary gears - long 8 Double web planetary gear carrier 9 Double web planetary gears - short 10 Double web sunwheel 3 11 Torque output from transmission A Multiplate clutch B Multiplate clutch C Multiplate brake D Multiplate brake E Multiplate clutch Engine torque is transferred, via operation of single or combinations of clutches to the 2 planetary gear trains. Both gear trains
are controlled by reactionary inputs from brake clutches to produce the 6 forward gears and 1 reverse gear. The ratios are as
follows: www.JagDocs.com

Ration 4.171 2.340 1.521 1.143 0.867 0.691 3.403 Shift Elements



Item Description 1 Turbine shaft 2 Stator shaft 3 Single web planetary gear train 4 Ring gear 1 5 Clutch A 6 Clutch B 7 Clutch E 8 Brake clutch C 9 Fixed connection to transmission housing 10 Shaft key 11 Brake clutch D 12 Double web planetary gear train 13 Planetary gears - long 14 Ring gear 2 15 Sunwheel 2 16 Sunwheel 3 17 Double web planetary gear carrier 18 Planetary gears - short 19 Single web planetary gear carrier 20 Sunwheel 1 The shift elements are three rotating multiplate clutches (A, B and E) and two fixed multiplate brakes (C and D). All shifts
from 1st to 6th gears are power-on overlapping shifts. Overlapping shifts can be described as one of the clutches continuing to
transmit drive at a lower main pressure until the next required clutch is able to accept the input torque.

The shift elements, clutches and brakes are actuated hydraulically. Fluid pressure is applied to the required clutch and/or brake,
pressing the plates together and allowing drive to be transmitted through the plates. The purpose of the shift elements
is to perform power-on shifts with no interruption to traction and smooth transition between gear ratios.

The JaguarDrive selector and the selector valve spool are in the 'D' position. Engine torque is transmitted from the torque
converter turbine shaft to the ring gear 1 of the single web planetary gear train and the outer plate carrier of clutch 'E'.

Ring gear 1 drives the planetary gears which rotate around sunwheel 1. This drives the planetary gear carrier 1 and also the
outer plate carrier of clutch 'A' and the inner plate carrier of clutch 'B'.

When clutch 'A' is engaged, sunwheel 3 in the double web planetary gear train is driven and meshes with the short planetary
gears.

The double web planetary gear train is locked against the transmission housing by brake 'D'. This allows ring gear 2 (output
shaft) to be driven in the same direction as the engine via the long planetary gears.


NOTE: Refer to 'Shift Elements' illustration for key

Power Flow 1st Gear

Power Flow 2nd Gear



The JaguarDrive selector and the selector spool valve are in the 'D' position. Engine torque is transmitted from the torque
converter turbine shaft to the ring gear 1 of the single web planetary gear train and the outer plate carrier of clutch 'E'.

Ring gear 1 drives the planetary gears which rotate around sunwheel 1. This drives the planetary gear carrier 1 and also the
outer plate carrier of clutch 'A' and the inner plate carrier of clutch 'B'.

When clutch 'A' is engaged, sunwheel 3 in the double web planetary gear train is driven and meshes with the short planetary
gears.

Sunwheel 2 is locked to the transmission housing by brake clutch 'C'. The long planetary gears, which are also meshed with the
short planetary gears, roll around the fixed sunwheel 2 and transmit drive to the double web planetary gear train carrier and
ring gear 2 in the direction of engine rotation.


NOTE: Refer to 'Shift Elements' illustration for key

Clutch brake 'C' is applied which locks sunwheel 2 to the transmission housing.

Clutch 'E' is engaged and drives the double web planetary gear carrier. This causes the long planetary gears to rotate around
the fixed sunwheel 2 and transmit drive to ring gear 2 which is driven in the direction of engine rotation.


NOTE: Refer to 'Shift Elements' illustration for key



Power Flow Reverse Gear



The JaguarDrive selector and the selector spool valve are in the 'R' position. Engine torque is transmitted from the torque
converter turbine shaft to ring gear 1 of the single web planetary gear train and the outer plate carrier of clutch 'E'.

Ring gear 1 drives the planetary gears of the single web planetary gear train which rotate around the fixed sunwheel 1. This
transmits the drive to the single web planetary gear carrier, the outer plate carrier of clutch 'A' and the inner plate carrier of

clutch 'B'.

With clutch 'B' applied, sunwheel 2 in the double web planetary gear train is driven and meshes with the long planetary gears.

The double web planetary gear carrier is locked to the transmission housing by brake clutch 'D'. This allows ring gear 2 to be
driven in the opposite direction to engine rotation by the long planetary gears.


NOTE: Refer to 'Shift Elements' illustration for key



INSTRUMENT CLUSTER

1 Transmission selected gear status 2 MIL (malfunction indicator lamp) 3 Message center The instrument cluster is connected to the TCM via the high speed CAN bus. Transmission status is transmitted by the TCM and displayed to the driver in one of two displays in the instrument cluster. For additional information, refer to 413-01
Instrument Cluster.

Malfunction Indicator Lamp

The MIL (malfunction indicator lamp) is located in the tachometer in the instrument cluster. Transmission related faults which
may affect the vehicle emissions output will illuminate the MIL.
The MIL is illuminated by the ECM (engine control module) on receipt of a relevant fault message from the TCM on the high speed CAN. The nature of the fault can be diagnosed using a Jaguar approved diagnostic system which reads the fault codes stored in the TCM memory.
Transmission Status Display

The transmission status display is located in a LCD (liquid crystal display) at the top of the instrument cluster, between the
speedometer and the tachometer. The LCD shows the JaguarDrive selector position or the selected gear when in manual 'Jaguar Sequential Shift' mode.
The following table shows the displays and their descriptions.

Symbol Description P Park selected R Reverse selected N Neutral selected D Drive selected S Sport mode selected 1 1st gear selected (manual Jaguar sequential shift mode) 2 2nd gear selected (manual Jaguar sequential shift mode) 3 3rd gear selected (manual Jaguar sequential shift mode) 4 4th gear selected (manual Jaguar sequential shift mode) 5 5th gear selected (manual Jaguar sequential shift mode) 6 6th gear selected (manual Jaguar sequential shift mode) The message center is located in the lower center of the instrument cluster. The message center is a LCD to relay vehicle status and operating information to the driver and can display messages relating to a number of the vehicle systems. If a
transmission fault occurs, the message center will display the message 'GEARBOX FAULT'.

TRANSMISSION CONTROL MODULE

The TCM outputs signals to control the shift control solenoid valve and the EPRS (electronic pressure regulating solenoid) to control the hydraulic operation of the transmission.

The TCM processes signals from the transmission speed and temperature sensors, the ECM and other vehicle systems. From the received signal inputs and pre-programmed data, the module calculates the correct gear, torque converter clutch setting
and optimum pressure settings for gear shift and lock-up clutch control.

The ECM supplies the engine management data over the high speed CAN bus. The TCM requires engine data to efficiently control the transmission operation, for example; flywheel torque, engine speed, accelerator pedal angle, engine temperature.
The steering angle sensor and the ABS (anti-lock brake system) module also supply data to the TCM on the high speed CAN bus. The TCM uses data from these systems to suspend gear changes when the vehicle is cornering and/or the ABS module is controlling braking or traction control.

Using the signal inputs and the memorized data, the TCM control program computes the correct gear and torque converter lock-up clutch setting and the optimum pressure settings for gear shift and lock-up clutch control. Special output-side modules
(power output stages, current regulator circuits), allow the TCM to control the solenoid valves and pressure regulators and consequently precisely control the hydraulics of the automatic transmission. In addition, the amount and duration of engine
interventions are supplied to the engine management by way of the CAN bus.
The transmission has a fully electronic JaguarDrive selector with no Bowden cable connection to the transmission. The
transmission selections are made using a rotary JaguarDrive selector which rises from the floor console once the engine is
running. Rotation of the JaguarDrive selector to any of the five positions is sensed by the TCM via the high speed CAN bus. The TCM then reacts according to the selected position. The 'S' (sport) position selection allows the TCM to operate the transmission using the semi-automatic 'Jaguar Sequential Shift'.

Gear selections are sensed by the TCM when the driver operates the steering wheel paddle switches. Once the JaguarDrive selector position is confirmed, the TCM outputs appropriate information on the high speed CAN bus.
If the JaguarDrive selector is in 'D', 'Jaguar Sequential Shift' is temporary and will cancel after a time period or can be cancelled
by pressing and holding the + paddle for approximately 2 seconds.

If the JaguarDrive selector is in 'S', 'Jaguar Sequential Shift' is permanent and can only be cancelled by pressing and holding
the + paddle for approximately 2 seconds or by moving the JaguarDrive selector to the 'D' position.
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