Jaguar XJ (X350). Service manual — part 635
1
Fuel injection supply manifold
2
Throttle body
3
Fuel pressure sensor
4
Fuel injector
The electronic returnless fuel system has the advantages of reduced fuel temperature and fuel tank
vapor caused by constant fuel recirculation. The system delivers the correct amount of fuel to the
engine under all conditions and at a constant pressure differential with respect to manifold absolute
pressure.
Fuel is supplied at high pressure to the fuel injectors via a fuel injection supply manifold which
incorporates fuel injectors, a fuel pressure sensor and a fuel temperature sensor. The engine control
module (ECM) increases the fuel pressure to minimize fuel vapor formation to maintain fuel flow
across the injectors.
The throttle body assembly is calibrated during assembly, no adjustments are required or permitted.
The throttle motor is a 12 volt DC motor which, via movement of the throttle blade, controls the
amount of air flowing into the engine.
Diagnosis and testing
Fuel Charging and Controls - VIN Range:
G00442->G45703
Inspection and Verification
1 . Verify the customer concern.
2 . Visually inspect for obvious signs of mechanical or electrical damage.
Visual Inspection Chart
Mechanical
Electrical
Engine oil level
Cooling system coolant level
Fuel level
Fuel contamination/grade/quality
Throttle body
Poly-vee belt
Fuses
Wiring harness
Electrical connector(s)
Sensor(s)
Engine control module (ECM)
Transmission control module (TCM)
1 . Verify the following systems are working correctly:
Air intake system
Cooling system
Charging system
Ignition system
2 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible)
before proceeding to the next step.
3 . If the cause is not visually evident and the Jaguar approved diagnostic system is not available, use
a fault code reader to retrieve the fault codes before proceeding to the diagnostic trouble code (DTC)
index chart, or the symptom chart if no DTCs are set.
CAUTION: When probing connectors to take measurements in the course of the pinpoint
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tests, use the adaptor kit, part number 3548-1358-00.
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.
NOTE:
Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
Symptom
Possible source
Action
Engine cranks, but does not
fire
Engine breather system
disconnected/restricted
Ignition system
Fuel system
Harness
CKP sensor
ECM fault
Check engine breather system,
Engine Emission Control - VIN Range:
G00442->G45703 For ignition
system,
Engine Ignition - VIN Range: G00442-
>G45703 Check fuel pressure,
Fuel Tank and Lines - 3.0L/3.5L/4.2L,
VIN Range: G00442->G45703 For CKP
tests,
Electronic Engine Controls - VIN
Range: G00442->G45703 Contact
dealer technical support for advice on
possible ECM failure.
Engine cranks and fires, but
will not start
Purge valve
Fuel pump
Engine coolant temperature
(ECT) sensor
Spark plugs
HT short to ground (tracking)
check rubber boots for
cracks/damage
Ignition coil failure(s)
Harness
For evaporative emissions
components,
Evaporative Emissions - VIN Range:
G00442->G45703 Check fuel
pressure.
Fuel Tank and Lines - 3.0L/3.5L/4.2L,
VIN Range: G00442->G45703 For ECT
sensor tests,
Electronic Engine Controls - VIN
Range: G00442->G45703 For ignition
system
Engine Ignition - VIN Range: G00442-
>G45703
Difficult to start cold
Check coolant anti-freeze
content
Battery
CKP sensor
EGR valve stuck open
Fuel pump
ECT sensor
Purge valve
For battery information,
Battery For CKP sensor tests,
Electronic Engine Controls - VIN
Range: G00442->G45703 For EGR
system information,
Engine Emission Control - VIN Range:
G00442->G45703 Check fuel
pressure.
Fuel Tank and Lines - 3.0L/3.5L/4.2L,
VIN Range: G00442->G45703 For ECT
sensor tests,
Electronic Engine Controls - VIN
Range: G00442->G45703 For
evaporative emissions components,
Evaporative Emissions - VIN Range:
G00442->G45703
Difficult to start hot
Injector leak
Fuel temperature (FT) sensor
IAT sensor
MAF sensor
Purge valve
Fuel pump
Ignition system
ECT sensor
EGR valve stuck open
For fuel injector information,
Fuel Injectors (18.10.02) For FT
sensor, IAT sensor and MAF sensor
tests,
Electronic Engine Controls - VIN
Range: G00442->G45703 For
evaporative emissions components,
Evaporative Emissions - VIN Range:
G00442->G45703 Check fuel
pressure.
Fuel Tank and Lines - 3.0L/3.5L/4.2L,
VIN Range: G00442->G45703 For
ignition system,
Engine Ignition - VIN Range: G00442-
>G45703 For ECT sensor tests,
Electronic Engine Controls - VIN
Range: G00442->G45703 For EGR
information,
Engine Emission Control - VIN Range:
G00442->G45703
Difficult to start after hot
soak (vehicle standing after
engine has reached
operating temperature)
Injector leak
FT sensor
IAT sensor
For fuel injector information,
Fuel Injectors (18.10.02) For FT
sensor, IAT sensor and MAF sensor
tests,
Electronic Engine Controls - VIN
Range: G00442->G45703 For
evaporative emissions components,
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