Jaguar XJ (X350). Manual — part 1171

Resume switch.

Resume switch.

Cancel switch.

When adaptive speed control is fitted, the headway switches have no affect on automatic speed

limiter.

Message center

Automatic Speed Limiter Messages

The automatic speed limiter will keep the driver informed of it's status by displaying messages in the

message center.

Message Displayed

Petrol Description

Diesel Description

LIMITER SET XXX

mile/h

Display speed always shown to driver.

Display speed always shown to driver.

LIMITER SET XXX kph

Display speed always shown to driver.

Display speed always shown to driver.

TOO FAST TOO

RESUME

Resume pressed at 25 +/- 5 kph above

the previous set speed.

Resume pressed at 25 +/- 5 kph above

the previous set speed.

OVER LIMIT + Amber

light

Vehicle speed at 3 kph (1.8 mile/h)

above speed limiter speed.

Vehicle speed at 3.25 kph (2.0 mile/h)

above speed limiter speed.

OVER LIMIT +

Flashing Amber Light

Vehicle speed at 15 kph (9.3 mile/h)

above speed limiter speed.

Vehicle speed at 7.5 kph (4.6 mile/h)

above speed limiter speed.

OVER LIMIT +

Flashing Amber light

+ bong

Vehicle speed at 15 kph (9.3 mile/h)

above speed limiter speed for period

of time X.

Vehicle speed at 7.5 kph (4.6 mile/h)

above speed limiter speed for period

of time X.

Activation of the Automatic Speed Limiter

The driver has the ability to change trip units, which will make the display speed change in

increments of 2 kph or 1 mile/h.

The automatic speed limiter can be set using the set +/- switch to the nearest 2 kph (1 mile/h)

depending on the drivers selected trip units.

The automatic speed limiter can be ramped up to major increments of 10 kph or 5 mile/h

depending on the drivers selected trip units.

The automatic speed limiter has a minimum set speed of approximately 32 kph (20 mile/h).

The automatic speed limiter will stay active and not cancel if the vehicle speed falls below the

minimum set speed.

Maximum Operating Speed of the Automatic Speed Limiter

Engine

Maximum Speed

2.7L Diesel

249 kph (155 mile/h)

3.0L

249 kph (155 mile/h)

3.5L

249 kph (155 mile/h)

4.2L

249 kph (155 mile/h)

4.2L Supercharged 249 kph (155 mile/h)

Cancellation of the Automatic Speed Limiter

The following three actions will cause the automatic speed limiter to cancel.

Cancel switch.

Accelerator kick down.

De-selection by the master switch.

Service Issues

Limiter Not Available

It is difficult to get 'LIMITER NOT AVAILABLE' without a 'CRUISE NOT AVAILABLE' or a throttle

malfunction. The automatic speed limiter is designed to limit the throttle and it is therefore very

difficult to make the feature fail.

The automatic speed limiter shares the master ON/OFF switch and cruise switches with the speed

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control/adaptive speed control. Any failure will inhibit the speed control/adaptive speed control as

well as automatic speed limiter.

Over speed down hill

The automatic speed limiter does not have any brake assistance, this means automatic speed limiter

will over speed on down hill gradients.

The message center will display over speed warnings if the pre set thresholds have been exceeded.

This is the intended functionality.

When message center provides the driver with over speed warnings; it is the driver's responsibility to

apply the brakes.

Ramp down of set speed

The driver has the ability to ramp down the set speed i.e. transition from 96.5 kph (60 mile/h) to 48.2

kph (30 mile/h) zone.

Automatic speed limiter is not able to apply the brakes. The vehicle will be slowed down by engine

braking ONLY.

The message center will display over speed warnings if the preset thresholds have been exceeded.

This is the intended functionality.

When message center provides the driver with over speed warnings; it is the driver's responsibility to

apply the brakes.

Differences between Diesel and Petrol Automatic Speed Limiter

Set Events

The diesel automatic speed limiter is set by holding the set + switch for a specific (approximately

400ms) period of time.

The petrol automatic speed limiter is set by pressing and releasing the set + switch.

Automatic Speed Limiter, CC and ACC Tolerances

Both the adaptive speed control and the automatic speed limiter display a 'set speed' to the

driver. This 'set speed' should match the speedometer, however it is acceptable for it to be
within a tolerance of one increment +/- 1 kph (0.5 mile/h).

When switching between the automatic speed limiter and adaptive speed control functions there

may be a difference in speed of +/- 2 kph or +/- 1 mile/h, this is acceptable due to both
speeds being calculated on different modules. If the difference is greater than 4 kph or 2
mile/h there may be a configuration issue.

The ECM calculates the displayed speed for the automatic speed limiter.

The ACC module calculates the display speed for the adaptive speed control.

The speedo and set speed tolerance region will be approximately between 48 kph (30 mile/h)

and 145 kph (90 mile/h). The speedometer may not match the set speeds when travelling in
excess of 145 kph (90 mile/h), this is acceptable.

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