Jaguar XJ (X350). 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

www.

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,

www.