Jaguar XJ (X350). 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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