303 JAGUAR X308 1998 2.G Workshop Manual

Fuel System - General Inform
ation - Fuel System
Description an
d Operation

The fuel tank is mounted across the vehicle behind the passenger compartment bulkhead.
Fuel is drawn by the fuel pump from the tank and then supplied to the two fuel rails, via a filter.
Fuel injectors are installed in the fuel ra ils on each side of the intake manifold.
The amount of fuel injected into th e engine is controlled by the ECM.
A cross-over pipe connects the two fuel ra ils together at the front of the manifold.
A test valve in the cross-over pipe allo ws the fuel rail to be pressurized and de-pressurized during the servicing and
troubleshooting procedures.
A pressure regulator on the rear of the right fuel rail controls the pressure in the fuel rails.
A return line directs excess fuel from the pressure regulator back to the fuel tank.
Operation and service procedures
The fuel injector
s, rails, pres
sure regulator and, wher e fitted, supercharger are described in greater detail in Section 303-04
together with servicing procedures.
The fuel tank, pump, fuel level senders and fuel lines are similarly covered in Section 310-01.

Filler Cap and P
ipe
The fuel
filler cap with bayonet-type fixi
ng is located beneath a remote-release sp ring-latched lid on the rear saddle panel
on the left-hand-side of the vehicle.
Fuel Pum
p
The fu
el pump(s) is energized by an ECM co
ntrolled relay. Fuel is drawn by this pu mp and supplied to the fuel injectors via
the fuel line, filter and fuel rails.
Servicing of the fuel pump re quires fuel tank removal.
Ev
aporative Loss Flange Assembly
The evaporative-loss flan
ge asse
mbly is mounted centrally on top of the tank. The flange assembly consists of a removeable
steel cap which mounts the evaporative emissions system vapor outlet valves and, if applicable, a pressure sensor. The
external electrical supply to th e fuel pump(s) is also made via a connector on the flange.
The flange assembly is fixed to the tank by a locking ring which is turned usin g special tool JD-174. A seal is fitted between
the flange assembly and the tank. Three di fferent flange assemblies are applicable according to the evaporative emission
system fitted to the vehicle. The fl ange size and fixing are identical fo r the three systems, as described.
Removal of the evaporative flange assembly is necessary to gain access to th e fuel pump(s) and other internal components.
To remove the evaporative fl ange assembly the fuel tank must first be removed.
The evaporative flange variant assemblies are described, together with service information, in Section 303-13.
Fuel R
eturn
Excess fuel
is directed back to
the fuel tank via a return line.
Fuel Pum
p Relay
The
fuel pump relay,
under control of the ECM, switches power to the fuel pump motor.
I
nertia Fuel Shutoff (IFS) Switch
The IF
S switch is located in the right-hand
side footwell behind the footboard carpet . When activated the switch isolates the
ignition system and fuel pump, releases any locked doors and disables unnecessary electrical systems. The system can be
reset by pressing down the flexible cover on the top of the switch.
• NOTE: The doors will not unlock if the IFS switch is tripped when the ignition switch is in position '0'.

Fuel Tank and Li
nes - Fuel Pump
Re
moval and Installation
Remov

al
Installation

1.
WARNING: B
EFORE PROCEEDING, IT IS ESSENTIAL THAT

THE WARNING NOTES GIVEN IN SECTION 100-00 (UNDER THE
HEADING 'SAFETY PRECAUTIONS') ARE READ AND
UNDERSTOOD.
Remove the battery. For additional information, refer to Section
414
-0
1 Battery, Mounting and Cables
.
2.
Drain th
e fuel tank using a suitab
le suction pump/tanker. If the
On-board Refueling Vapour Recove ry (ORVR) system is fitted,
refer to Section 310
-00
Fuel System
- General
Information
.
3. R
emove the fuel tank. For addi
tional information, refer to Fuel
Tank
in this section.
4. Remove the fuel tank evaporativ e loss flange sealing ring. For
additional information, refer to Section 303
-13

.
5. R
emove fuel feed hose from tank.
U

sing special tool JD175, slacken fuel feed hose to tank
stub securing clip.
Di
sconnect hose from tank stub.
6. Remove fuel pump assembly.
R
elease bolt securing fuel
pump mounting bracket and
place assembly to front.
Slac
ken securing clip and disc
onnect hose from fuel pump.
R
emove link lead from fuel pump.
Re

move pump.
1. NOTE: Install new sealing ring to evaporative loss flange. For
additional information, refer to Section 303
-13

.
In
stallation is th
e reverse of the removal procedure.

Symp
tom #5
Sy
m
ptom #5


Low r
e
frigerant charge
*
Check f or 'hissi
ng' at expansion
valve; may be witnessed by low
HIGH side pressure. Recover / recharge
*
Moi
s
ture or air in the system
*
Chec k syst
em pressures
*
Heat er ci
rcuit air-lock
*
R e
fer section 303-03 for fill / bleed procedure
*
Suct ion
pipe touching bank 1 (A)
cylinder head (rubber isolator
missing)
*
Check the pi
pe cluster for correct fitti
ng
*
• NOTE: Electrical faults may be more rapidly traced using PDU
Sym
ptom
Possib
l
e Sources
Acti
o
n
Insuffi
ci
ent
heating
Coo l
ant flow valve stuck 'closed'
Coolant flow valve stuck 'open' allowing recirculation of
coolant at engine idle
*
*
Re
new v
alve
*
Motorized in-car aspirator sei zed
*R e
new aspirator
*
Coo l
air bypass damper stuck open

*
Re new,
check fault code #43

*
B l
ocked air inlet / pollen filter
*
Chec k / cl
ean / renew
*
B l
ower speed low
*
Check performance range
*
Low cool ant
level
*
Adjust as req u
ired (verify and correct
reason for loss)
*
Engine
t
hermostat faulty
*
Check engine r u
nning temperature
*
Heater water pump seized
*Chec k op
eration
*
Heater ma trix
blocked
*
Re new m
atrix
*
Heater circui t
air-lock
*
R e
fer section 303-03 for fill / bleed
procedure
*

Sym
p
tom #4
Sym
ptom #4
Sy
m
ptom
Possib
l
e Sources
Acti
o
n
No
i
sy
system
Loose or damaged compressor drive
belt
*Adjust or r
e
new
*
Loose compressor mountings
*Check f o
r damage, tighten to specification if OK
*
Compressor oil level l
ow
*
Look for evidence of l
eakag
e and rectify as required
*
Compressor internal dama ge
*Check f o
r debris, renew compressor and receiver drier
*
B l
ower motor noise
*
Re new m
otor (assuming no fan interference)
*
Excessive refrige rant charge
*Check f o
r vibration or 'thumping'
in high pressure line; may be
witnessed by high pressure on both HIGH and LOW sides.
Recover / recharge
*

System Self-test
Other conditions which may exist but will NOT log fault codes:
Associated Faults
System Self-test
Panel Communication Check
The panel communication check veri fies the inputs and outputs from the control panel to the A/CCM.
Actuator Check Procedure
The system self test procedure drives all the actuator moto rs, to check their operation. If an actuator is operating
incorrectly or operating outside of its limi ts then a fault code will be present.
Before commencing with the actuator check procedure, ensure the ca r is operating under normal conditions.
1. 1. Switch ignition OFF.
2. 2. Press and hold the RECIRC and AUTO buttons simult aneously, switch ignition ON and run the engine.
3. 3. All the control panel LEDs and all LCD segments will flas h on and off. Any function LED indicator which does not
flash on / off suggests a fault condition within that area of the panel or, with the LED.
Any LCD element which fails to flash on / off indicates a fault within the display element or panel.
4. 4. Press AUTO
43 Cool air by-pass
motor faultHarness / connector fault
Servo motor seized or sticking
Flap seized or sticking
*
*
*Refer to PDU
*
43 Cool Air by-pass
motor faultHarness / connector fault
Servo motor seized or sticking
Flap seized or sticking
*
*
*Refer to PDU
*
44 Defrost vent motor
faultHarness / connector fault
Servo motor seized or sticking
Flap seized or sticking
*
*
*Refer to PDU
*
45 Centre vent motor
faultHarness / connector fault
Servo motor seized or sticking
Flap seized or sticking
*
*
*Refer to PDU
*
46 Foot vent motor
faultHarness / connector fault
Servo motor seized or sticking
Flap seized or sticking
*
*
*Refer to PDU
*
SymptomPossible SourcesAction
No heatAirlock in system.
*Refer section 303-03 for fill / bleed procedure
*
Heater water pump inoperative
Coolant flow valve stuck closed
*
*Check operation and circuit
*
Faulty engine coolant thermostat
*Renew as required
*
One vent failing to open / closeBroken linkage.
*Renew as required
*
Poor airflowBlower motors - incorrect operation
*Check operation and circuit
*
ItemCheck LEDCondition
IgnitionDefrostIGN input at 12V, check LED is illuminated
AuxiliaryFaceAUX input at 12V, check LED is illuminated
ClockFeet / faceClock input normal, check LED is illuminated
Start inputFootStart input normal, check LED is illuminated
Data outScreen / footData out input normal, check LED is illuminated
Dimmer overrideRecirc.Dimmer override input ON, check LED is illuminated

Uni-Body, Subframe and Mounting System - Front Axle Crossmember
Removal and Installation
Removal
CAUTION: Replacement of nuts and bolts: Various thread-locking devices are used on nuts and bolts throughout the
vehicle. These devices restrict the number of times a nut or bolt can be used. See section 100-00 for information.
Special Tool(s)

Tie-Rod-End Taper Separator
211-098 (JD 100)

Engine Support Beam
303-021 (MS 53D)
1. Position vehicle on a four-post lift.
2. Raise front of vehicle and support on stands.
3. Remove battery cover and disc onnect ground cable from
battery terminal. Refer to section 86.15.15.
4. Open hood to service position, and fit covers to fenders.

5. Remove both engine covers (nor mally aspirated vehicles only).
Release pegs.
Remove covers.
6. Remove air intake tube/meter/ cleaner cover assembly. Refer
to 19.10.30

7. Support weight of engine.
1. Position special tool 303-021 in RH and LH fender channels and tighte n beam fixings.
2. Engage hooks in the en gine front lifting eyes.
3. Tighten hook adjustment nuts until weight of engine is supported.

Repeat procedure to install opposite side shock absorber.

21. Install lower steering column on pinion shaft.
Move column downwards to engage coupling splines on
pinion shaft.
1. Install nut and bolt and tighten to 22-28Nm.
22. Lower and withdraw jack from crossbeam.

23. Release engine from support tool.
1. Slacken hook adjustment nuts until weight of engine is released.
2. Remove hooks from engine front lifting eyes.
3. Remove special tool 303- 021 from fender channel.

24. Install crossbeam to engine Hydramount securing bolts.
Install bolt securing Hydr amount to crossmember and
tighten to 22-28Nm.
Repeat procedure to install crossmember opposite side
securing bolt.
25. Position and connect harnes s to steering transducer.
RHD vehicles. Position steeri ng harness behind return
pipe.
Connect harness to transducer.

Uni-Body, Subframe and Mounting System - Front Axle Crossmember
Front Bushing
Removal and Installation
Removal
CAUTION: Replacement of nuts and bolts: Various thread-locking devices are used on nuts and bolts throughout the
vehicle. These devices restrict the number of times a nut or bolt can be used. See Section 100-00 for information.
Special Tool(s)

Engine Support Beam
303-021 (MS 53D)

Front Camber Tie-down Link
204-114 (JD 133)
1. Position vehicle on a four-post lift.
2. Remove ignition key and en gage steering column lock.
3. Open hood to service position, and fit covers to fenders.
4. Remove battery cover and disc onnect ground cable from
battery terminal. Refer to 86.15.19.

5. Remove both engine covers (nor mally aspirated vehicles only).
Release pegs.
Remove covers.
6. Remove air intake tube/meter/ cleaner cover assembly. Refer
to 19.10.30
7. Remove air intake tube/meter/ cleaner cover assembly. Refer
to 19.10.30
8. Support weight of engine.
1. Position special tool 303-021 in RH and LH fender channels and tighte n beam fixings.
2. Engage hooks in the en gine front lifting eyes.
3. Tighten hook adjustment nuts until weight of engine is supported.

3. Remove special tool 303-021 from fender channel.

11. Install crossbeam to engine Hydramount bolts.
Install bolt securing Hydramou nt to crossbeam and tighten to 34-46Nm.
Repeat procedure to install crossbeam opposite side bolt.

12. Tighten rear mounting bolt and nut to 131-185 Nm.
Repeat procedure to tighten opposite side rear mounting
bolt and nut.

13. Connect steering rack transducer harness front connector.
Connect steering ha rness connector.
Install harness connector on body retaining clip.
14. Slacken adjuster nut and remove camber tie down tool 204-
114 from suspension.
Repeat procedure to remove tie down tool from opposite
side.

Uni-Body, Subframe and Mounting System - Front Axle Crossmember
Front Bushing Heat Shield
Removal and Installation
Removal
CAUTION: Replacement of nuts and bolts: Various thread-locking devices are used on nuts and bolts throughout the
vehicle. These devices restrict the number of times a nut or bolt can be used. See Section 100-00 for information.
Special Tool(s)

Engine Support Beam
303-021 (MS 53D)

Front Camber Tie-down Link
204-114 (JD 133)
1. Position vehicle on a four-post lift.
2. Remove ignition key and en gage steering column lock.
3. Open hood to service position, and fit covers to fenders.
4. Remove battery cover and disc onnect ground cable from
battery terminal. Refer to section 86.15.15.

5. Remove both engine covers (nor mally aspirated vehicles only).
Release pegs.
Remove covers.
6. Remove air intake tube/meter/ cleaner cover assembly. Refer
to 19.10.30
7. Remove air intake tube/meter/ cleaner cover assembly. Refer
to 19.10.30
8. Support weight of engine.
1. Position special tool 303-021 in RH and LH fender channels and tighte n beam fixings.
2. Engage hooks in the en gine front lifting eyes.
3. Tighten hook adjustment nuts until weight of engine is supported.