fuel pressure JAGUAR S TYPE 2005 1.G Technical Guide Update

JAGUARS-TYPEGlossary
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ABS anti-lock braking system
ABS/TCCM anti-lock braking system/
traction control system control
module
A/C air conditioning
A/CCM air conditioning control
module
ADCM adaptive damping control
module
ADRC adaptive damper ride control
ALR automatic locking retractor
BIW body-in-white
ûC degree Celsius
CAN controller area network
CATS computer active technology
suspension
CD compact disc
CTCM cellular telephone control
module
DATC dual automatic temperature
control
DDCM driver door control module
DSC(CM) dynamic stability control
(control module)
DSCM driver seat control module
DSHCM driver seat heater control
module
ECM electronic control module
EFT engine fuel temperature
(sensor)
EVAP evaporative emission
FTP fuel tank pressure (sensor)
GDO garage door opener
GECM general electronic control
module
GPS global positioning system
HO2S heated oxygen sensor
in inch
IP injection pressure (sensor)
IVD interactive vehicle dynamics
kg kilogram
km/h kilometer per hour
kW kilowatt
lb pound
m meter The following abbreviations are used in this document:
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LH(D) left-hand (drive)
mile/h mile per hour
mm millimeter
ms millisecond
NAS North American specification
NCM navigation control module
Nm Newton meter
OBD on-board diagnostics
PAS power assisted steering
PATS passive anti-theft system
PCM powertrain control module
PDU portable diagnostic unit
PSHCM passenger seat heater control
module
RECM rear electronic control module
RCM restraints control module
RH(D) right-hand (drive)
RPC(M) reverse park control (module)
RTTI real time traffic information
SAE Society of Automotive Engineers
SCLM steering column lock module
SCP standard corporate protocol
SRCM sliding roof control module
SRS supplementary restraints
system
TACM throttle actuator control
module
UK United Kingdom
USA United States of America
V volt
VACM voice-activated control module
VECM vehicle emergency control
module
VEMS vehicle emergency messaging
system
VICM vehicle information control
module
VICS vehicle information and
communication system
VIN vehicle identification number

JAGUARS-TYPEFuel System
38
Introduction
The fuel tank components, operation and layout
are new to Jaguar and have no commonality with
previous systems. The major features of the fuel
delivery system are the use of a saddle type tank
and a returnless fuel system. The evaporative loss
management system is similar in operation to that
fitted to the XJ and XK Series vehicles and on-
board refuelling vapour recovery (ORVR) is a
standard feature. For NAS markets only, leak test
diagnostics are performed.
Returnless Fuel System
The returnless fuel system delivers the correct
amount of fuel to the engine under all conditions
and at a constant pressure differential with
respect to manifold pressure. This is without the
need for a return line to the tank or a fuel rail
pressure regulator. The use of a return line and
the pressure drop across a regulator contribute to
vapour formation which can affect fuelling
calibration and requires a complex vapour
management system to meet legislative
requirements. Elimination of these components,
D.310.047
together with closed loop control of the variable
speed fuel pump, causes a reduction in the vapour
generated, lower fuel temperatures and better fuel
pressure control. Additional advantages include a
reduced load on the electrical system and
improved fuel economy.
Fuel Tank
The fuel tank is of the ÔsaddleÕ type shape with LH
and RH fuel compartments and is constructed of
high density polyethylene (HDPE), a plastic blow
moulded material. The tank is located below the
rear passenger seat with the drive shaft and
exhaust running through the arch of the tank. The
underside of the tank is protected by a fitted heat
shield and the tank assembly is retained by two
metal straps which are fixed to the underbody at
the front by removeable hinge pins and at the rear
by bolts.
Refuelling is via a separate filler pipe and
connecting hose to a stub pipe on the RH fuel
compartment.
A fuel pump module is located in the RH
UNDERFLOOR FUEL TANK AND CARBON CAN SYSTEM LAYOUT
Carbon Can AssemblyFuel Filler (pipe removed)
Fuel Tank Assembly

JAGUARS-TYPEFuel System
39
D.303.1242
compartment and a transfer module in the LH
compartment with external cross-over pipes for
fuel transfer between the compartments. Both
module assemblies have integral top plates for
external pipework and electrical connectors.
These are secured in the tank using screw on
plastic closure rings. The closure rings are
accessible from inside the vehicle via two access
holes in the floor panel below the rear seat. Due
to the confined working space and the possibilityof fuel spillage within the vehicle, it is advisable to
remove the tank completely before attempting to
remove the internal assemblies.
FUEL TANK
Grade Vent Valve
Fuel Pump
Connectors
Pressure
Relief Valve
Float Level
Vent Valve
Heat Shield
To Carbon
Canister
Vapour to EVAP Valve
Fuel to Engine
Fuel Transfer Pipes
Tank Retaining
Strap
LH Compartment
RH Compartment

JAGUARS-TYPEFuel System
40
J.310.046
Fuel Filter
Fuel Rail
Fuel Injectors
Fuel Injectors
Fuel Level
Senders
Jet PumpJet PumpFuel Pump
Fuel Reservoir
Parallel Pressure
Relief Valve
Pump and Sender
Electrical Connector
RH Compartment
LH Compartment
Fuel Flow
The variable speed fuel pump is contained in a
fuel reservoir in the RH module assembly. Fuel is
pumped from the reservoir through an external
cross-over pipe to the LH compartment where it
flows via a T junction to the parallel pressure
relief valve and then out to the engine fuel rail.
The reservoir is maintained by fuel supplied by jet
pumps in the LH and RH compartments.
Pressurised fuel from the variable speed pump is
forced through the small jet nozzles (diameter
0.5mm) creating a suction which draws fuel up
from the tank. From the LH tank, this fuel is
pumped through an external cross-over pipe and
then into the reservoir. In the RH tank, the jet
pump is located in the base of the reservoir.
The parallel pressure relief valve assembly
contains two spring loaded valves which operate
in opposite directions, a fuel rail feed valve whichopens at approximately 2 psi during normal
operation and a second valve which opens at
approximately 45-70 psi to relieve excessive rail
pressure.
The main functions of the valves are:
¥ To help engine starting by retaining fuel in the
supply lines and rail.
¥ To limit rail pressure due to temporary vapour
increase during hot soak conditions
(temperature and thus pressure drop after
approximately 20 minutes).
¥ To limit rail pressure caused by sudden load
changes such as a full to closed throttle
transition.
¥ To prevent siphoning from the tank in the
event of the fuel line being severed with the
pump inactive.
Each side of the tank has an independently
FUEL FLOW
Sender Electrical Connector

JAGUARS-TYPEFuel System
41
JOL.062
INERTIA SWITCH operating fuel level sender assembly mounted on
the respective module assembly.
Control and Operation
The speed of the fuel pump is varied under closed
loop control so as to deliver the required fuel rail
injection pressure in accordance with factors such
as driver demand, manifold pressure and
temperature changes. The control loop sensors,
providing feedback information to the powertrain
control module (PCM), are the engine fuel
temperature (EFT) sensor and the injection
pressure (IP) sensor which are both mounted
directly on the engine fuel rail (see
S-TYPE Powertrain Technical Guide). The IP sensor
also has a vacuum feed from the intake manifold
so as to measure the pressure differential.
The required fuel flow is determined by the PCM
and sent to the rear electronic control module
(RECM) which is the power driver for the fuel
pump. The PCM demand to the RECM is a pulse
width modulated (PWM) signal over a single line
at a frequency of approximately 256 Hz and a
duty cycle of 0-50%. The RECM effecively
amplifies this signal by increasing the frequency
by 64 and doubling the duty cycle, thus providing
the necessary high current drive for the fuel
pump. The fuel pump relay, located in the rear
power distribution box, is energised by the PCM
relay and provides a dedicated fused supply to the
RECM for the pump drive.
When the ignition switch is turned from OFF to
RUN or START, the PCM primes the system by
running the pump for 1 second at full speed. The
pump is switched off 1 second after the engine is
stopped. During hot starts, fuel pressure is
increased to prevent vapour lock.
Fuel pump drive status is monitored by the RECM
and communicated to the PCM via the SCP
network.
Outputs from the fuel senders are connected by
independent wires to the RECM which sends the
data to the instrument pack and the PCM.
Inertia Switch
The inertia switch is located behind the trim on
the left side of the vehicle, forward of the front
door post and below the fascia. A finger access
hole in the trim allows the switch to be reset.

JAGUARS-TYPEFuel System
42
Evaporative Emissions System
The function and operation of the on-board
refueling vapor recovery (ORVR) evaporative
emissions system are similar to the system fitted
to the XJ and XK Series vehicles in NAS markets
but use different components. For the S-TYPE the
system is fitted as standard for all markets.
Fuel Tank Components
To meet ORVR evaporative emission
requirements, the tank and associated
components are designed to minimise vapour
losses. During re-fuelling, the narrowed fuel filler
tube below the nozzle region provides a liquidseal against the escape of vapour and a check
valve in the tank inlet pipe opens to incoming fuel
only to prevent splashback. As the tank fills,
vapour escapes through the open float level vent
valve, at the top of the tank, and passes through
the adsorption canisters to atmosphere. When the
rising fuel level closes the float valve, the resulting
back pressure causes refuelling cut-off. While the
float valve is closed, any further rise in vapour
pressure is relieved by the grade vent valve which
connects to the canisters via the outlet of the float
valve. At less than full tank level, the float valve is
always open, providing an unrestricted vapour
outlet to the canisters.
If the tank is over filled (eg a fault in the delivery
system) an integral pressure relief valve in the float
valve assembly opens to provide a direct vent to
atmosphere.
The float level vent valve/pressure relief valve
assembly and the grade valve are welded to the
tank top and are non-serviceable. Note that both
valve assemblies incorporate roll-over protection.
The fuel filler cap uses a 1/8 turn action and is
tethered to the body. The filler cap assembly
incorporates both pressure relief and vacuum
relief valves (the latter is a new feature to Jaguar).
D.310.049
FUEL TANK CONNECTIONS
Fuel Tank
Pressure Valve
(NAS markets only)
Jet Pump Assembly
Connectors
Fuel Pump
Connectors
To Carbon
Canister
Vapour to EVAP Valve
Fuel to Engine
Fuel Transfer
Pipes

JAGUARS-TYPEFuel System
43
Carbon Canister Assembly
Three series connected carbon canisters are used
for vapour storage and are mounted on a plastic
bracket fixed to the underbody above the rear
axle. For Federal markets only, where there is a
requirement for leak test diagnostics, a canister
vent valve (CC valve) is also mounted on the
canister bracket and a fuel tank pressure (FTP)
sensor is fitted to the vapour pipe.
Evaporative Purge Valve
The EVAP valve is mounted on the rear lefthand
side of the engine bay. The valve is different to
XK/XJ Series types but is controlled in a similar
way by a PWM signal and manifold vacuum.
D.310.048
D.303.1279
EVAP VALVE CARBON CANISTER ASSEMBLY
Carbon Canisters
CCV Connector
Canister Close
Valve (CCV)
Mounting
Bracket
Solenoid Connector
Manifold
Control
Vacuum

JAGUARS-TYPEElectrical/Electronic
96
JOL.002
1. Engine temperature gauge
2. Direction indicators
3. Tachometer
4. Front fog lamps on
5. Traction control/DSC warning light
6. Main beam on
7. Rear fog lamps on
8. Speedometer
9. Fuel gauge
10. Overspeed Warning (Middle East markets
only)
11. Airbag system warning light
12. Seat belt warning light - driverÕs seat belt not
fastened13. Anti-lock braking system warning light
14. Brake warning light
15. Message center warning light - primary
warning
16. Message center display - displays odometer,
trip, status/warning messages
17. Message center amber warning light -
secondary warning
18. Check engine warning light
19. Charge indicator warning light - high or low
battery voltage or faulty generator
20. Low oil pressure warning light
21. High engine temperature warning light INSTRUMENT PACK
126 5 4
3
109 8 7
112
13 12 18 20 19 1416 15 17 21
¥ Low brake fluid / Park brake telltale
¥ Fail safe cooling / Engine overtemperature
telltale
¥ Check engine telltale
The driver warning chime provides the driver with
an audible warning for the ignition on, key in
ignition, all doors open and the headlamps on,
hood open, trunk open, lamps on and safety belt
not engaged. A chime will sound every one
second when a fault in the air bag circuit is
detected.
The driver is also provided with a visual message
or warning displayed in the information message
center.