Jaguar XJ (2008 year). Service manual — part 39

157

Transmission

R

Transmission

GEARSHIFT INTERLOCK

A brake pedal/gearshift interlock system
is incorporated in the automatic gear
selector mechanism.

To move the gear selector from Park:

1. Turn the ignition key to position II or

start the engine.

2. Press the brake pedal.

Note: Under the following conditions, the
brake pedal must be released and
re-applied before moving the gear
selector from Park:
• The gear selector was moved into

Park while the brake pedal was
depressed or;

• The brake pedal was depressed while

the ignition was switched ON.

In either case the letter P for PARK on the
gearshift will flash to indicate that the
interlock is still active.

GEAR SELECTOR LEVER

The J-gate gear selector lever is designed
to accommodate two different driving
techniques as follows:
• Automatic selection – the right-hand

side of the selector gate.

• Manual selection – the left-hand side

of the selector gate to individually
select 5th, 4th, 3rd, or 2nd gear.

Gear selector positions

!

WARNING:

The EPB or brake pedal must be
applied before selecting forward or
reverse drive from a stationary
position.

P = Park – Use when parking. In this
position the transmission is locked. Do
not select if the vehicle is moving.

N = Neutral - Disconnects the driveline
from the engine. Use the EPB when
stopping temporarily.

Note:

•

After selecting forward or reverse
drive ranges from Neutral or Park, wait
briefly for the transmission to engage
before accelerating.

•

When in Neutral or Park the engine
can only be accelerated to 4500
rev/min.

R = Reverse – Do not select if the vehicle
is moving forward.

The reversing lamps come ON
automatically when reverse gear is
selected and the ignition switch is in
position II.

D = Drive – All six gears are changed
automatically as required by the throttle
position and road speed.

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Transmission

158

L

2, 3, 4, 5 = If selected, the transmission
operates automatically in second, third,
fourth or fifth gear but will not engage
gears higher than the one selected.

When the vehicle is stationary the
automatic gear selector may be left in D,
2, 3, 4, or 5, unless the vehicle is to be
parked. When stopping for traffic lights,
junctions etc., either select P or apply the
EPB and select N.

Drive to fifth

When driving in gear position D with sixth
gear engaged, the gear selector can be
shifted sideways across the gate to 5.

Provided that the vehicle’s speed is not
too great, the transmission will shift down
to fifth. Sixth gear will be inhibited until the
gear selector is moved back to D.

Hill climbing and engine braking

When driving on roads with long downhill
gradients, selecting 3 or 2 (depending on
road/traffic conditions) will give engine
braking.

When the gear selector is moved from D,
5, 4, or 3 down to 2, downshift to second
gear will only take place at appropriate
road speeds.

Reverse inhibit

Reverse is inhibited when the vehicle is
moving forward at speeds above 8 km/h
(5 mph).

Note: Reverse inhibit will not function in
limp home mode.

Kickdown

Kickdown is operated when the pedal is
pressed fully down, beyond the normal
operating range and against a spring
pressure, to provide maximum engine
performance.

Kickdown is used in circumstances where
rapid acceleration is required, such as
when overtaking.

Kickdown causes the transmission to
change down to the lowest gear possible
to achieve maximum acceleration.

The gear engaged depends on the road
speed at the time of kickdown.

As well as shifting down, the gearshift
points are extended to give greater
performance. This mode is in effect for as
long as the pedal is pressed fully down.

Limp home mode

In the unlikely event of an electrical or
mechanical failure, transmission
operation will be impaired. The vehicle
gear selector ranges P, R, N, D can still be
used to enable the vehicle to be driven to
a safe area.

The driver should be aware that the
vehicle’s performance will be reduced
and must take this into account when
driving. In this event consult a Jaguar
Dealer immediately.

159

Transmission

R

SPORT MODE

The switch marked S on the J-gate
surround enables the driver to select
either normal N or sport S modes.

When sport mode is selected the
automatic transmission will operate
normally, but the gearshift points are
extended to make full use of the engine’s
power reserves.

To select Sport, press the switch. A red
indicator within the switch is illuminated
to indicate that sport mode has been
selected.

To cancel Sport, press the switch again.

Note: Both sides of the J- gate can be
used, irrespective of transmission mode.
For example, with S selected, the
transmission can be operated in full
automatic mode or by manual selection.

In addition to the switched transmission
modes (N and S) the transmission control
module will select shift patterns to suit
specific conditions.

Cruise Control

When cruise control is operating at set
speed the transmission selects a shift
pattern to suit cruise control operation.

Dynamic Stability Control (DSC)

When DSC is switched ON and the
system is activated, the transmission
selects a shift pattern to suit traction
control conditions.

Gradients

When the vehicle is being driven on roads
with uphill gradients, the transmission
adapts the shift pattern to make better
use of engine power and aid engine
cooling.

Note: Under the conditions previously
described, the relevant transmission
mode will override the N or S modes
selected by the driver. When such
conditions no longer exist, the
transmission will revert to the shift pattern
previously selected by the driver, i.e. N or
S.

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Cruise (Speed) Control

160

L

Cruise (Speed) Control

INTRODUCTION

The cruise (speed) control system, when
fitted, can be used by the driver to
maintain a selected vehicle speed above
28 km/h (17.5 mph) without the driver
having to use the accelerator.

Switches on the steering wheel allow the
driver manual control of the system.
Brake operation also influences the cruise
control system.

1. RESUME - to resume the set speed

retained in memory.

2. SET - to set the speed or

increase/decrease the set speed
when the speed has been set.

3. CANCEL - cancels cruise control but

retains the set speed in memory.

OPERATION

Setting the vehicle speed

!

WARNING:

Only use cruise control when
conditions are favourable, for example,
straight, dry, open roads with light
traffic.

When you are travelling at the speed you
require, which must be above 28 km/h
(17.5 mph), press the SET button.

Cruise control will engage and maintain
the set speed and you can remove your
foot from the accelerator pedal.

Note: Cruise control will automatically
disengage when the brake pedal is
pressed or when the vehicle speed falls
below 26 km/h (16 mph).

Changing the set speed

There are three ways to change the set
speed:

1. Accelerate or decelerate to the

desired speed then press the SET (+)
button.

2. Increase or decrease the speed by

pressing and holding either SET (+) or
(–) until the desired speed is obtained,
then release the switch.

3. Increase or decrease the speed in

steps of 2 km/h (1 mph) by briefly
pressing either the SET (+) or (–) until
the desired speed is obtained.

Resuming the set speed

If the vehicle is accelerated above the set
speed, then the set speed will be resumed
when the accelerator pedal is released.

If CANCEL is pressed, or the brake pedal
is pressed, the cruise control will
disengage but the set speed memory will
be retained. Press RESUME and the
vehicle will return to the set speed.

Note: Cruise control will not resume at
speeds below 28 km/h (17.5 mph).

RESUME will not operate if the ignition
has been turned off.

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