Jaguar XJ (X350). Service manual — part 810
Item
Part Number
Description
1
—
Charge air cooler
2
—
Supercharger outlet pipe
3
—
Throttle body elbow
4
—
Charge air cooler
5
—
Supercharger
Intake air distribution and filtering for vehicles with supercharger
Air is supplied to the supercharger via the air cleaner, air cleaner outlet pipe, throttle body intake
pipe, throttle body and throttle body elbow. The supercharger delivers pressurized air to two
separate charge air cooler units, each unit being mounted on the cylinder bank it supplies.
Pressurized cooled air is fed from the charge air coolers directly into each inlet port. The air cleaner
outlet pipe differs from the normally aspirated by having tuned resonators to reduce inlet noise
levels. An intake air temperature sensor is fitted at the outlet of the bank 1 charge air cooler. The
sensor provides an input to the engine control module (ECM). <<303-14B>> The intake elbow directs
the metered airflow from the throttle body outlet (underside of the throttle body) into the intake of
the supercharger. The supercharger by-pass valve assembly is part of the intake elbow. The butterfly
valve inside the assembly is opened by a diaphragm actuator operated by vacuum feed from the
elbow. At closed or partially open throttle positions, the butterfly valve opens, allowing the airflow
from the two charge air cooler inlets to be directed back to the supercharger inlet. This action
inhibits the supercharging effect and reduces engine torque. Progressive opening of the throttle
causes the by-pass valve to gradually close.
Supercharger
The supercharger is attached to the three mounting bosses between the two cylinder heads. The
supercharger has a filled for life internal lubrication system. The supercharger is positively aligned
with the drive belt by a doweled mounting bracket.
Charge Air Cooler
Each cylinder bank is fitted with a charge air cooler which supplies pressurized air to the four
cylinders. The inlet ports to the two charge air coolers are connected to the supercharger via the
supercharger outlet pipe consisting of adjustable metal ducts with bonded rubber seals. The charge
air coolers are water cooled via a radiator and water pump. <<303-03B>>
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Diagnosis and testing
Intake Air Distribution and Filtering - VIN
Range: G00442->G45703
Inspection and Verification
1 . Verify the customer concern by operating the system.
2 . Visually inspect for obvious signs of mechanical damage.
Visual Inspection Chart
Mechanical
Air cleaner intake pipe
Air cleaner outlet pipe
Air cleaner element
Throttle body intake pipe
Throttle body gasket
Throttle body
Supercharger outlet pipe to charge air cooler duct(s)
Supercharger outlet pipe gasket
Supercharger outlet pipe
Air intake elbow
Air intake elbow gasket
Air intake elbow retaining bolt seal(s)
Supercharger
Charge air cooler gasket(s)
Charge air cooler(s)
1 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible)
before proceeding to the next step.
2 . If the cause is not visually evident, verify the symptom and refer to the Jaguar Approved
Diagnostic System.
Intake Air Distribution and Filtering - VIN
Range: G45704->G99999
Overview
There are changes to the engine management system (EMS) for 2006 my, the most obvious of which
will be the change to 7-digit diagnostic trouble codes (DTCs) from the familiar 5-digit, plus the
addition of secondary air injection and changes to evaporative emissions and exhaust gas
recirculation to comply with stage four emissions requirements.
For more information on these systems,
Evaporative Emissions - VIN Range: G00442->G45703
Engine Emission Control
Inspection and Verification
1 . Verify the customer concern.
2 . Visually inspect for obvious signs of damage.
Mechanical
Electrical
Hoses and ducts (damage/connections)
Air cleaner element (contaminated/blocked)
Restricted air intake
Supercharger
Supercharger drive belt
Charge air coolers (damage/connection)
Supercharger outlet pipes and gaskets
Supercharger air intake elbow/hoses
Seals and gaskets
Mass air flow (MAF) sensor
Manifold absolute pressure (MAP) sensor
Throttle body
Harness (security/damage)
Connections (security/damage)
3 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible)
before proceeding to the next step.
4 . If the cause is not visually evident use the Jaguar approved diagnostic system or a scan tool to
retrieve the fault codes before proceeding to the diagnostic trouble code (DTC) index.
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