service 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'.

P a
rts List
The fuel level sensor is mounte d on the fuel tank vertical face and reacts to level changes via a float and pivot which is
connected to a potentiometer. As the fuel level drops the resistance increases.
The fuel level sensor can be serviced without removing the tank.
It e
m
Par
t
Number
De
scr
iption
1—Lockin
g rin
g
2—Fue
l
level sensor
3—Seal

Fuel
Level Sensor

Pinpoint test B:
P1646
W
i
th conditions as in A14, measure the insulation
resistance between EM013/001 and BT009/001.
1
I s
the resistance > 10M OHM?
Yes Reconnect all plugs and replace relay 4.
GO to A16
No
A 16:
END
Perform
a
ppropriate service drive cycle and check for the
presence of DTC.
1
Has th
e fault code cleared?
Yes STOP
No Contact Ja
guar Serv ice
PINPOINT TEST B : B: P1646
TE
ST CONDITIONS
D
E
TAILS/RESULTS/ACTIONS
B1
: RETRI
EVE DTCS
•
NOTE
: Battery and or ECM disconnection prior to scanning wi
ll erase all data, ensure that the correct DTC is present.

Pinpoint test C: P0460
Wi
th conditions as in B14, measure the insulation
resistance between EM013/009 and BT009/003.
1
I s
the resistance > 10M OHM?
Yes Reconnect all plugs and replace relay 1.
GO to B16
No
B 16:
END
Perform
a
ppropriate service drive cycle and check for the
presence of DTC.
1
Has th
e fault code cleared?
Yes STOP
No Contact Jaguar Service
PI
NPOINT TEST C : C: P0460
T
E
ST CONDITIONS
D
E
TAILS/RESULTS/ACTIONS
C1
: RETRIEVE DTC
S
•
NOTE
: Battery and or ECM disconnection prior to scanning wi
ll erase all data, ensure that the correct DTC is present.

W
ith connectors FC025, FC024, and BT014 disconnected
measure the resistance between FC025/013 and BT014.
1
I
s the resistance < 0.5 OHM?
Yes GO to C7
No Inspect harness / connectors / pins FC024, FC001/004,
BT004/025 and BT014 for corrosion, damage, bent or
pushed back pins. Repair as required and test the system
for normal operation.
C7
: END
Perform

appropriate service drive cycle and check for the
presence of DTC.
1
Has
the fault code cleared?
Yes STOP
No Contact Jaguar Service

Climate Co
ntrol System - General In
formation - Climate Control System
Description an
d Operation
CAUTION: Observe all relevant safety requirements. Wear suitable eye and skin protection Do not mix HFC 134A and
CFC 12 refrigerants. Do not vent refrigerant directly to atmosphere and always use Jaguar approved recovery, recycle and
recharge equipment. Note the amount of recovered refrigerant; it will indicate the state of the system.
Working Practices
Be aware o
f, and comply with al
l health and safety requirements , whether they be legislative or common sense. This applies
to conditions set both for the operator and workshop.
Before commencing any repair or service procedure, disconnect the vehicle battery ground lead and protect the vehicle,
where appropriate, from dirt or damage.
Work in a well ventilated, clean and tidy area.
Keep all components and tools clean.
Recovery, recycle and recharge equipment must meet, or ex ceed, the requirements detailed in the Specification sub-
section.
Handling Refrigerant

We
ar eye protection at all times. Use gloves and keep all
skin covered that may come into contact with refrigerant.
Should refrigerant come into co ntact with eyes or skin, wash the affected area with cool water and seek medical advice; do
not attempt to treat the condition yourself.
Avoid breathing refrigerant vapor; it may cause irritation to the respiratory system.
CAUTION: Never use high pressure comp ressed air to flush out a system. Under certain ci rcumstances a combination
of HFC 134A refrigerant, compressed air and a source of combus tion (welding and brazing operations in the vicinity), may
result in an explosion and the release of potentially toxic compounds.

HFC 134A and CFC 12 refrigerants must neve r come into contact with each other. They will form an inseparable mixture
which can only be disposed of by incineration.
Do not vent refrigerant directly to atmo sphere; always use Jaguar approved recove ry equipment. Never depress the charge
or discharge port valves to check for the pr esence of refrigerant.
HFC 134A refrigerant is fully recycleable and it may be 'cleaned' by the recovery equipment and therefore re-used following
removal from a system.

Climate Co
ntrol System - General In
formation - Air Conditioning (A/C)
System Check - Re tail Procedure
Gen
eral Procedures
E

vacuating the Manifold Gauge Set
Connecting the Manifold Gauge Set
C
AUTION: Only use hoses with connectors wh
ich are dedicated to HFC 134A charge ports.
Stabilizing the System

1.
At
tach the center (service) hose to a vacuum pump and start
the pump. Open fully both high and low valves and allow the
vacuum to remove air and mois ture from the manifold set for
at least five minutes.
CAUTION: It is imperative th at the vacuum pump is not
subjected to a positi ve pressure of any degree. Therefore the
pump must be fitted wi th an isolation valve at the center (service
hose) connection and this valve mu st be closed before the pump
is switched off. This operation replaces the 'purge' procedure used
on previous systems. Observe the manufacturer's
recommendation with regard to vacuum pump oil changes.
Turn the vacuum pump off and isol ate it from the center service
hose but do not open the hose to atmosphere.
1. Att
achment of the hose quick release connectors to the high
and low side system ports is stra ightforward, provided that the
high and low valves are closed and the system is NOT
operational.
WARNING: UNDER NO CIRCUMSTANCES SHOULD THE
CONNECTIONS BE MADE WITH THE SYSTEM IN OPERATION OR
THE VALVES OPEN. SHOULD THE VALVES BE OPEN AND A
VACUUM PUMP OR REFRIGERANT CONTAINER ATTACHED, AN
EXPLOSION COULD OCCUR AS A RESULT OF HIGH PRESSURE
REFRIGERANT BEING FORCED BACK INTO THE VACUUM PUMP OR
CONTAINER.
Assessment of system operating efficiency and fault
classification may be achieved by using the facilities on your
Recovery / Recharging / Recycling station, follow the
manufacturer's instructions implicitly and observe all safety
considerations.
1. Accurate test gauge data wi
ll on
ly be attained if the system
temperatures and pressures are stabilized.
E
nsure that equipment and hoses cannot come into
contact with engine moving parts or sources of heat.
It is recommended th at a free standing air
mover is placed
in front of the vehicle to provide air flow through the
condenser / cooling system.
St
art the engine, allow it to attain normal working
temperature and set at fast idle (typically 1200 to 1500
rpm).


Select full

air condit
ioning performance.
With
all temperatures and pres
sures stable, or displaying
symptoms of faults; begin relevant test procedures.

Climate Control System - General Infor
mation - Air Conditioning (A/C)
System Recovery, Evacuation and Charging
Gen e
ral Procedures
Recover / Reclaim
Ev
acuation
Charging

1.
CAUTIO
N: Read the procedures and instructions supplied
by the manufacturer of the air co nditioning service center before
commencing any process requiring the handling of refrigerant. In
addition to the manufacturer's in formation, observe all safety
precautions and advice deta iled in this section.
Disconnect battery ground lead; refer to 86.15.19.
2. Remove passenger side fi
rewall cover.
3. Remove driver side firewall cover.
4. Remove engine compar tment rear cover.

5. Re
move vehicle charge port
protective caps and connect
equipment pressure hoses to vehicle.
1. BLUE hose = low pressure.
2. RED hose = high pressure.
6. Complete procedure in ac cordance with equipment
manufacturer's instructions.
1. Complete procedure in ac cordance with equipment
manufacturer's instructions.
This proc
ess will typically ta
ke 30 minutes, but will depend
upon the equipment and the ex tent of repairs carried out
to the system.
1. Set the appropriate charge weight, see Specifications in this
section.
2. Complete procedure in ac cordance with equipment
manufacturer's instructions.
3. Disconnect hoses from vehicle and replace charge port
protective caps.
4. Reconnect battery ground lead; refer to 86.15.15.
5. Check system for correct operation.

Clima
te Control System - General Inform
ation - Manifold Gauge Set Connection
Ge
neral Procedures
Mani
fol
d.
Low Side Pressure Gauge.
High Side Pressure Gauge.

1.
The 'ma
nifold gauge set' is a most important tool for tracing faults and
system efficiency assessment. The relationship between HIGH and LOW
pressures and their correlation to AMBIENT and EVAPORATOR
temperatures must be compared to determine system status (see
Pressure / Temperature graphs).
Because of the heavy reliance upon this piece of equipment for service
diagnosis, ensure that the gauges are calibrated regularly and the
equipment is treated with care.

2.
Parts
List
ItemDescri
ption1LOW side
serv
ice hose

- BLUE
2LOW side
ha
nd valve -
BL
UE3LOW
pres
sure
compound
gauge _ BLUE
4HI GH

pressure
gauge _ RED
5HI GH
side
hand valve -
RED6HI GH
side
service hose
- RED
7Sys t
em
service hose
- Neutral color,
commonly YELLOW
1. The manifold is designed to control refrigerant flow. When connected into
the system, pressure is registered on both gauges at all times. During
system tests both the high and low side hand valves should be closed
(rotate clockwise to seat the valves). The hand valves isolate the low and
the high sides from the center (service) hose.
1. This compound gauge, is designed to register positive and negative
pressure and may be typically calibrate d - Full Scale Deflection, 0 to 10
bar (0 to 150 lbf / in2) pressure in a clockwise direction; 0 to 1000 mbar
(0 to 30 in Hg) FSD negative pressu re in a counter clockwise direction.
1. This pressure gauge may be typically calibrated from 0 to 30 bar (0 to
500 lbf / in2) FSD in a clockwise direction. Depending on the
manufacturer, this gauge may also be of the compound type.