2010 JAGUAR XFR Engine

Published: 11-May-2011
Pedestrian Protection System - Pedestrian Protection System - Overview
Description and Operation

OVERVIEW


WARNING: All pyrotechnic devices are dangerous. Before performing any procedures on any pyrotechnic device, read all
information contained within the Standard Workshop Practices section of this manual.
Refer to: Standard Workshop Practices (100-00 General Information, Description and Operation).
The pedestrian protection system is designed to mitigate injuries in a pedestrian collision with the vehicle. It does this by
utilizing a pair of pyrotechnic actuators to lift the hood away from the engine, creating a cushioned impact between the
pedestrian and the vehicle.
The pedestrian protection system also includes passive protection integrated into the bumper system and bonnet structure.


WARNING: Do not fit any non-Jaguar approved accessories to the vehicle.


NOTE: The pedestrian protection system operates independently from the SRS (supplemental restraint system).

7 RH accelerometer 8 LH accelerometer 9 RJB (rear junction box) 10 BJB (battery junction box)
System Operation
The pedestrian protection system is operational when the vehicle is traveling at speeds between approximately 20 km/h (12.4
mph) and 45 km/h (28 mph). A vehicle speed signal is received by the pedestrian protection system control module over the
high speed CAN bus.
The system is able to determine if contact is made with a pedestrian or another object, such as a traffic cone, using signals
from accelerometers mounted behind the front bumper. When the system determines contact is made with a pedestrian it fires
the actuators to lift the rear of the hood approximately 130 mm within 35 ms of the 'fire' signal.

When an impact condition is registered, the pedestrian protection system control module outputs an impact signal on the high
speed CAN bus. This signal is used by the RJB to initiate the hazard warning lamps. If this occurs, the hazard warning lamp switch is disabled for the remainder of the current ignition cycle.

If the pedestrian protection system control module detects a fault with the system, it outputs a message on the high speed
CAN bus to the instrument cluster message center. On receipt of this, the message center will display the message 'CHECK PEDESTRIAN SYSTEM'.

The pedestrian protection system control module also stores the VIN (vehicle identification number). If a new control module
is fitted to the vehicle the Jaguar approved diagnostic tool must be used to program the unit with the vehicles VIN.
When the vehicle is delivered from the factory the pedestrian protection system is in a 'safe' plant mode. Normal operating
mode should be activated using the Jaguar approved diagnostic tool during the Pre-Delivery Inspection (PDI) prior to delivery
to the customer. For additional information, refer to the PDI manual.

If any damage is caused to the front of the vehicle, be it cosmetic or structural, repairs must be carried out in line with the
processes contained in the workshop manual. Failure to carry out the correct repair process could compromise operation of the
pedestrian protection system. Refer to GTR for the latest information.

The vehicle must be left for 1 minute after disconnecting the battery before any work can be carried out on the pedestrian
protection system.

Failure Mode Detection

In service, if any fault is detected, or any part of the system is recognized as not being present, the message center displays
the warning 'Check Pedestrian System'.

The bonnet deployment actuators are non-serviceable components, and if they must be replaced due to a fault, or due to
having been deployed, or following any other accident, their barcode labels must be read and recorded in the service database
against the vehicle VIN for security purposes.

After deployment of the pedestrian protection system, the vehicle must be stopped as soon as it is safe to do so. The hazard
warning lamps will be activated and can only be switched off by pressing the engine START/STOP button to turn the engine off
and on again. A warning message 'CHECK PEDESTRIAN SYSTEM' will appear on the message center and the vehicle should be
transported to the nearest dealer/authorised repairer. The vehicle must not be driven when the bonnet has been deployed.


NOTE: If the warning message 'CHECK PEDESTRIAN SYSTEM' appears in the message center when the bonnet has not
been deployed, the vehicle should be taken to the nearest dealer/authorised repairer immediately. It can be driven.

If any significant damage occurs to the front bumper it should be inspected by a dealer/authorised repairer as soon as
possible.



CONTROL MODULE Component Description

The control module is mounted below the hood release lever behind the side trim in the left hand front footwell.

The deployment signal is received from the pedestrian protection system control module. The second-generation system
adopted for XF is all-new to Jaguar and, although similar, differs from that introduced on XK by having an accelerometer-based
sensing system rather than a contact-sensing system. The accelerometer-based system is supplied by Bosch. Mounted very
close to the skin of the bumper, it examines the characteristics of vibration waves caused by impact. Its response time is
quicker, because it does not rely on the front of the bumper being loaded. It uses the 'saved' time to make more complex
decisions, and so has fewer error states. The speed of vehicle and the length of the bonnet define the time available to get
the bonnet into its deployed and stabilized position. It is possible, therefore, to create a time-line counting back from the
predicted moment of head impact to the time when the deployment signals need to be sent. That in turn defines a time from
first contact to decision time.
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NOTE: A = Non-deployed hinge; B = Deployed hinge



Item Description 1 Firing pin 2 Stabilizing link 3 Engine compartment lid leaf 4 Intermediate leaf 5 Body leaf The hinge system incorporates a number of leaves. This includes a leaf attached to the body, an intermediate leaf and a leaf
attached to the hood. During normal operation the hinge opens and closes using the hood and intermediate leaves. These are
attached together by a firing pin. When the actuators are fired the firing pins fail. This allows the hood and intermediate
leaves to separate and deploy the hood upwards. When the hood deploys the hood latches act as temporary hinges.


NOTE: The hinges deform during the deployment process and will need to be replaced.

Item
Description 1
Deformation area - roof rail 2
Deformation area - roof 3
Deformation area - door rocker panel Body measurements

Measuring options

Comparison measurements can also be made on the outside of the body. Depending on the damage, comparison
measurements and diagonal measurements can be carried out using compass, telescopic rod, tape measure or ruler.

NOTE: The same reference points must be chosen on both sides when checking for changed dimensions (e.g.
bores, edges, beads/swage lines etc).
All of the important external body dimensions are listed in Tolerance Checks.
For additional information, refer to: Body and Frame (501-26 Body Repairs - Vehicle Specific Information and Tolerance Checks, Description and Operation).
Measurements with a measuring/straightening jig.
A measuring/straightening jig is required for accurate measurements of the body. The measuring systems are
categorised by their means of operation:
Mechanical measuring system.
Optical measuring system.
Quick and accurate measuring results can be obtained using computerised measuring systems.

A minimum of three intact measuring points on the body are required for measurements of length, width and height
dimensions.

In some cases this may mean making the measuring points accessible. All of these measuring systems can be used to make
body measurements, provided all the equipment is available.

Planning a repair

The following decisions have to be made before the repairs are started:

Does the vehicle need to be put on a straightening jig, or can it be straightened by other means?
Does the body need to be measured?
Do aggregates like engine or axles need to be removed? Impact energy is transferred via the side member to the A-pillar

NOTE: It is preferable to repair body parts rather than to renew them, as this keeps the complete body-shell
intact.

Which body parts need to be renewed?
Which body parts can be repaired?
Obtaining spare parts

The availability of spare parts often determines how easily the body repairs can be carried out. The following procedure is
recommended:

Obtain all the data for the vehicle, including type, vehicle identification number, trim code, engine identification letters,
initial registration etc.
Establish all of the metal parts that need to be renewed.
Establish all of the attached parts that need to be renewed, including small parts like rivets, clips etc.
Straightening repairs


WARNING: The use of heat when pulling to straighten body panels, (such as side members), is not recommended.
Longitudinal pulling, (hot or cold), is also not recommended. A small amount of side to side pull is permissible, (cold).

When any type of pulling or straightening operation is performed it is important to observe for any movement in adjacent
panels.
A panel must retain its strength and integrity, if there is any doubt the panel must be renewed.
Straightening repairs are often required to restore the body to its original shape after an accident. This can be done with:
Alignment jigs.
Universal straightening and measuring jigs.
Welding jig system.

The following points must be followed to Make sure that the repairs are carried out professionally and that all the dimensions
are correct after the repairs have been carried out.
Structure:
- The repair sequence depends on the individual repair plan (taking any necessary disassembly work into
account).
- Clean the attachment areas.
- Anchor the vehicle free of stress on the relevant system.
- Support the aggregates to take strain off the body.
- Decide on at least three measuring/mounting points that are undamaged and as far apart as possible (for basic
adjustment).
- Check the dimensions of the measuring/mounting points.
Straightening:

NOTE: Check dimensions and gaps continuously during straightening.

- A body is always straightened in the opposite direction to that of the impact. Always carry out straightening
repairs with the complete body shell assembled (do not cut out any parts beforehand). Carry out the
straightening work in several stages. This prevents the risk of over stretching or of welded joints tearing out.
During the individual straightening steps, relieve tension by striking with an aluminium hammer while the part is
subjected to a tensile load (in the area of pre-determined folding points, dents, welded joins etc.).
Special features:
- Ultra high strength steel cannot be straightened due to its brittleness and must always be replaced. www.JagDocs.com

- Disadvantage: Scarring and hardening of the surface.
Flattening using a copper electrode.
- Small, sharp dents that face outwards can be worked on with a copper electrode.
Flattening using a flame and body files.

NOTE: When applied correctly, this method can be used with all the attached parts still in place (roof headlining,
wiring harnesses etc.).

- Small, soft dents (only slight stretching): Working at the edges of the dent in an inward spiral pattern, the dent
is heated with an oxyacetylene torch (torch size 1 - 2 mm, excess gas flame) to approx. 250° C.
- Working rapidly with a body file extracts heat from the edge area until the dent is flattened. Preferably alternate
between two files. This increases the amount of heat that can be extracted.

Safety measures

The electronic control modules (ECM) fitted to vehicles make it advisable to follow suitable precautions prior to carrying
out welding repair operations. Harsh conditions of heat and vibration may be generated during these operations which
could cause damage to the modules. In particular, it is essential to follow the appropriate precautions when
disconnecting or removing the airbag RCM.
Do not allow electronic modules or lines to come into contact with the ground connection or the welding electrode.
Seat belt anchorages are a safety critical. When making repairs in these areas, it is essential to follow design
specifications. Note that extra strength low alloy steel may be used for seat belt anchorages. Where possible, the
original production assembly should be used, complete with its seat belt anchorages, or the cut line should be so
arranged that the original seat belt anchorage is not disturbed.
All welds within 250mm (9.842) of seat belt anchorages must be carefully checked for weld quality, including spacing of
spot welds.
Remove the battery before carrying out welding work in its vicinity.
Utmost care must be taken when welding near the fuel tank or other components that contain fuel. If the tank filler
neck or a fuel line must be detached to allow access for welding work, then the fuel tank must be drained and removed.
Never weld, on components of a filled air conditioning system. The same applies if there is a risk of the air conditioning
system heating up.
Connect the ground connection of the electrical welder directly to the part that is to be welded. Make sure that there
are no electrically insulating parts between the ground connection and the welding point.
Adjacent vehicle parts and adjacent vehicles must be shielded against flying sparks and heat.

Pedestrian protection system

The pedestrian protection system is designed to mitigate injuries in a pedestrian collision with the vehicle. It does this by
utilizing a pair of pyrotechnic actuators to lift the hood away from the engine, creating a cushioned impact between the
pedestrian and the vehicle. It is essential that any repair or replacement operations do not affect the safe working of the
system.
For additional information, refer to: Pedestrian Protection System (501-20C Pedestrian Protection System, Description and Operation).

Resistance spot welding

Where resistance spot welds have been used in production, they must be reproduced with new spot welds in replacement
where possible. All such reproduction spot welds should be spaced 25 to 30mm apart.
Setting up the equipment and co-ordinating the welding parameters.

Equipment:
- Follow the equipment manufacturer's instructions for the equipment settings.
- Select the correct electrode arms (as short as possible).
- Align the electrode arms and tips exactly.
- Electrode tips should be convex (rough shaping with a file, fine shaping with a sanding block).
Body:
- Make sure that the flanges to be joined lie perfectly flat to one another.
- Prepare a bare metal joint surface (inside and outside).
Notes on technique/method:
- Carry out a test weld on a sample piece of the material coated in welding paste.
- If any metal parts are located between the electrode arms then there will be a loss of induction and therefore
power (adjust current setting).
- The power needs to be adjusted for high-strength low alloy steel.
- Repeated welding on old welding points often leads to poor quality welds.
- Keep the electrode tips as near as possible to an angle of 90° to the contact surface.
- Keep the pressure on the electrodes for a short period after finishing the weld.
- The electrodes work best if their shape is convex. Clean the contact surface of the electrodes regularly.
Resistance spot welding panels where the total thickness is 3 mm or more

For all repairs to modern Jaguar vehicles, spot-welding equipment should be suitable for reliable welding of zinc-plated,
high-strength and high-tensile steels in three or more layers, up to 5 mm total thickness. If these requirements are not
fulfilled, plug welding must be used for safety reasons. The electrical specifications (current, resistance, heat) of the
spot-welding equipment have different validity, depending upon the type of equipment. Therefore, it is essential that the
manufacturer's instructions are observed with regard to the actual welding performance.
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1
Water drainage, front 2
Water drainage, side and rear 3
Roof drainage 4
Engine compartment drainage Water leaks, diagnosis and corrective action: Front passenger compartment

Windscreen

Diagnosis:
- Ingress of water into A-pillar area or instrument cluster area and rocker panel area.
Cause:
- Breaks in adhesive beads
Corrective action:
- The breaks in adhesive beads can be located from inside by using compressed air. The leak can be identified
from outside by the escaping air.
- The second test method is by means of a water test. The outer trims must be raised carefully using a plastic
wedge. The leak should be located from inside by a second assistant. Water drainage system (illustration for reference only)
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Item From To Dimension A Headlamp RH inboard fixing hole Front fender LH forward fixing hole 510.5 B Transmission LH mounting, forward stud Engine RH mounting, forward fixing hole 987.2 C Transmission LH mounting, rear stud Engine RH mounting, forward fixing hole 1091












































Item From To Dimension A Front fender RH, rear fixing hole Front fender LH, rear fixing hole 1549.6 B Front fender RH, centre fixing hole Front fender LH, centre fixing hole 1518.1 C RH Headlamp top inboard fixing hole LH Headlamp top inboard fixing hole 771