Speed Control: Other Jaguar S-type I рестайлинг

RESUME Switch

When the RESUME switch is pressed with the vehicle travelling above 27 mile/h (43 kph) with the system in STANDBY mode, allows the vehicle to accelerate until the last set speed is resumed. The RESUME switch will not function if the ignition switch has been cycled or if the vehicle speed is below 27 mile/h (43 kph).

CANCEL Switch

When the CANCEL switch is pressed with the vehicle travelling above 27 mile/h (43 kph) the system will enter STANDBY mode.

SET Switch

When the SET +/- switch is pressed with the vehicle travelling above 27 mile/h (43 kph) the system allows the vehicle speed to be maintained to ± 1 mile/h (1.62 kph). Pressing the SET +/- switch will increase or decrease the vehicle speed respectively until the switch is released. If the respective switch is pressed momentarily, the speed will accelerate or decelerate in 1 mile/h increments.

Brake Pedal Position (BPP) Switch

If the brake pedal is activated while the speed control system is active, the ECM receives a signal from the brake pedal position switch. This will cancel speed control and allow the throttle blade to return to the position as demanded by the accelerator pedal.

If the brake pedal is activated while the speed control system is active, the ECM receives a signal from the speed control deactivator switch. This will cancel speed control and allow the throttle blade to return to the position as demanded by the accelerator pedal.

If the clutch pedal is activated while the speed control system is active, the ECM receives a signal from the clutch pedal position switch. This will cancel speed control and allow the throttle blade to return to the position as demanded by the accelerator pedal.

On vehicles for certain markets, an adaptive speed control system is installed as an option. In addition to the normal vehicle speed control functions, this system enables a preset distance to be maintained behind a moving vehicle immediately ahead, without driver intervention.

Automatic Switch Off - Vehicles with Adaptive Speed Control

The adaptive speed control will disengage, but not clear the memory when

1. the CANCEL button is activated.
2. the brake pedal is applied.
3. the vehicle speed falls below 26Km/h (16mph).
4. neutral, park or reverse gear positions are selected.
5. traction control is activated.

The adaptive speed control will disengage, and clear the memory when

1. the ignition switch is set to position '0'.

1. maximum vehicle speed is reached.
2. the park brake is applied.
3. a fault occurs in the adaptive speed control system.

Scheme 18

Forward Alert

The forward alert system is switched on and off by the forward alert switch. The forward alert system additionally provides warnings while the adaptive speed control is not activated.

Scheme 19

The adaptive speed control module incorporates a radar sensor and yaw rate sensor to provide system control functions.

Adaptive Speed Control Failure

If a fault occurs during any adaptive speed control operation the adaptive speed control system will be deactivated and will remain in this state until the fault is rectified. The message center will display 'CRUISE NOT AVAILABLE'.

Scheme 20

When the RESUME switch is operated with the vehicle travelling above 32 kph (20 mile/h) with the system in STANDBY mode, the vehicle is allowed to accelerate until the last set speed is resumed. The RESUME switch will not function if the ignition switch has been cycled or if the vehicle speed is below 32 kph (20 mile/h).

When the CANCEL switch is operated with the vehicle travelling above 32 kph (20 mile/h) the system will enter STANDBY mode.

When the SET +/- switch is operated with the vehicle travelling above 32 kph (20 mile/h) the system allows the vehicle speed to be maintained to ± 1.62 kph (1 mile/h). Pressing the SET +/- switch will increase or decrease the vehicle speed respectively until the switch is released. If the respective switch is pressed momentarily, the speed will accelerate or decelerate in 1.62 kph (1 mile/h) increments.

Scheme 21

If the brake pedal is operated while the speed control system is active, the ECM receives a signal from the BPP switch. This will cancel vehicle speed control and allow the throttle blade to return to the position as demanded by the accelerator pedal.

If the brake pedal is activated while the speed control system is active, the ECM receives a signal from the speed control deactivation switch. This will cancel speed control and allow the throttle blade to return to the position as demanded by the accelerator pedal.

Scheme 22

If the clutch pedal is activated while the speed control system is active, the ECM receives a signal from the clutch pedal position switch. This will cancel speed control and allow the throttle blade to return to the position as demanded by the accelerator pedal.

On vehicles for certain markets, an adaptive speed control system is installed as an option. In addition to the normal vehicle speed control functions, this system enables a preset distance to be maintained behind a moving vehicle immediately ahead, without driver intervention.

Automatic Switch Off - Vehicles with Adaptive Speed Control

The adaptive speed control will disengage, but not clear the memory when

1. the CANCEL button is operated.
2. the brake pedal is applied.
3. the vehicle speed falls below 32 kph (20 mile/h).
4. neutral, park or reverse gear positions are selected.
5. traction control is activated.
6. cruise override activated for more than five minutes.

The adaptive speed control will disengage, and clear the memory when

1. the ignition switch is set to position '0'.
2. a fault occurs in the adaptive speed control system.

Scheme 23

The message center will keep the driver informed by displaying messages and warnings.

Scheme 24

Forward Alert

The forward alert system is switched on and off by the forward alert switch, which is incorporated into the message center switch. The forward alert system additionally provides warnings while the adaptive speed control is not activated.

Scheme 25

The speed control module provides system control functions.

Scheme 26

The speed control sensor incorporates the forward looking radar sensor.

Adaptive Speed Control Failure

If a fault occurs during any adaptive speed control operation, the adaptive speed control system will deactivate and will remain in this state until the fault is rectified. The 'CRUISE NOT AVAILABLE' message will be displayed on the message center on 'demand' by trying to operate the steering wheel control switches. This on 'demand' strategy is intended to show that adaptive speed control is not available and another fault may exist. For example: If an anti-lock brake system or traction control error message is displayed this would imply that the brake system may be effecting or inhibiting the adaptive speed control. If the message center displays 'CRUISE NOT AVAILABLE' permanently or no message is displayed, this may imply that the vehicle has an ECM fault.

Detection

As with most sensors, there are certain conditions under which detection issues can occur. The owner/driver's attention should be drawn to the driver's handbook to avoid misunderstandings as to what is, and isn't, a fault.

Detection issues may occur

1. When driving on a different line to the vehicle in front
2. When vehicles edge into your lane
3. When going into or coming out of a bend
4. With detecting motorcycles
5. With detecting stationary objects, such as traffic queues, broken down vehicles, etc.

In circumstances such as these, the ACC system may brake late or unexpectedly, or may increase speed. This is not a fault , but is the system reacting to detection issues.

The owner's handbook makes it clear that the system should only be used under suitable conditions, but technicians should be wary of wasting time on complaints which are not actually faults.

Driver Information Chart

Note. Use this table to identify DTCs associated with the message center display, then refer to Diagnostic trouble code (DTC) index for possible sources and actions.

Note. For definitions of Default Modes, see the foot of this table.

Default mode definitions

LIMP-HOME MODE

1. Throttle motor off
2. Throttle motor relay off
3. Throttle motor circuit off
4. Fuel intervention
5. Speed (cruise) control inhibited

LIMP-HOME UNAVAILABLE

1. Power limitation
2. Vehicle speed limited to 120 kph (75 mph)
3. Reverse throttle progression enabled
4. Speed (cruise) control Inhibited

REVERSE THROTTLE PROGRESSION

1. Throttle opening limited to maximum 30%

Note. The throttle operation uses the same map as for reverse gear.

ENGINE SPEED LIMITED

1. Engine runs normally, up to 3000 rpm
2. Engine speed restricted to 3000 rpm maximum, by fuel cut-off

HIGH IDLE

1. Throttle valve kept in fixed position by motor
2. Speed (cruise) control Inhibited

SAFETY REDUNDANCY

1. Power limitation
2. Vehicle speed limited to 120 kph (75 mph)
3. Reverse throttle progression enabled
4. Speed (cruise) control Inhibited

Pinpoint Tests

Note. When performing electrical voltage or resistance tests, always use a digital multimeter (DMM) accurate to 3 decimal places, and with an up-to-date calibration certificate. When testing resistance, always take the resistance of the DMM leads into account.

As with most sensors, there are certain conditions under which detection issues can occur. The owner/driver's attention should be drawn to the driver's handbook to avoid misunderstandings as to what is, and isn't, a fault.

Detection issues may occur

1. when driving on a different line to the vehicle in front
2. when vehicles edge into your lane.
3. when going into or coming out of a bend.
4. with detecting motorcycles.
5. with detecting stationary objects, such as traffic queues, broken down vehicles, etc.

In circumstances such as these, the ACC system may brake late or unexpectedly, or may increase speed. This is not a fault , but is the system reacting to detection issues.

The owner's handbook makes it clear that the system should only be used under suitable conditions, but technicians should be wary of wasting time on complaints which are not actually faults.

Forward looking radar (FLR) sensor levelling

An incorrectly aligned FLR sensor can cause incorrect system operation. Before starting any repair work on the ACC system, check the levelling of the FLR sensor. This is carried out in a similar way to the module levelling in previous systems. See Speed Control Module Alignment .

Note. Use this table to identify DTC's associated with the message center display, then refer to DTC index for possible sources and actions.