2010 JAGUAR XFR Throttle

Air cleaner retaining bolts 8 - 71 Supercharger retaining bolts 25 18 - Charge air cooler lower assembly retaining bolts 20 15 - Throttle body retaining studs 10 7 - Charge air cooler top assembly retaining bolts 25 18 - Manifold absolute pressure and temperature (MAPT) sensor 5 - 44 Coolant outlet pipe 11 8 -

SUPERCHARGER System Operation

At closed or partially open throttle positions, the bypass valve is fully open, allowing a flow of air from the SC (supercharger)
outlet back to the inlet side. This results in little or no pressure increase across the SC. Progressive opening of the throttle reduces the depression downstream of the electric throttle. This is sensed by the pneumatic actuator, which moves to close
the bypass valve. As the bypass valve closes there is a corresponding increase in the outlet pressure from the SC, which increases engine power output.

NOISE FEEDBACK SYSTEM

Sound waves from the RH (right-hand) intake manifold are filtered by the calibrated orifice in the inlet pipe connection on the
symposer. The sound waves make the paddle oscillate and generate pulsations in the outlet chambers. When the pneumatic
valve is open, the pulsations are transmitted through the outlet pipe and feedback tube to the resonator in the passenger
compartment.

The tuning valve of the noise feedback system receives a power feed from the power distribution box and is connected to
ground through the ECM (engine control module). At lower engine loads and speeds the ECM keeps the ground open circuit and the tuning valve is de-energized closed. Atmospheric pressure is sensed at the pneumatic valve through the vent cap on the
tuning valve, which keeps the pneumatic valve closed and prevents sound from the symposer entering the feedback system.

At higher engine loads and speeds the ECM connects the tuning valve to ground. The tuning valve energizes, blanks off the atmospheric vent and opens the vacuum line between the brake vacuum system and the pneumatic valve. The depression in
the brake vacuum system is sensed at the pneumatic valve, which opens and allows sound from the symposer into the
feedback system.
The status of the pneumatic valve at various engine loads and speeds is given below:

Pneumatic Valve Status

NOTE: Values are for valve opening with increasing engine load and speed. Deduct 0.05 g/rev and 50 rev/min for valve
closing with decreasing engine load and speed.


Engine Load: g/rev Engine Speed: rev/min 0 500 1000 2500 3000 4000 5800 6500 1.30 Closed Closed Closed Closed Closed Closed Closed Closed 1.35 Closed Closed Closed Closed Closed Closed Closed Closed 1.40 Closed Closed Closed Closed Closed Closed Closed Open 1.60 Closed Closed Closed Closed Closed Closed Closed Open 1.80 Closed Closed Closed Closed Closed Closed Closed Open 2.50 Closed Closed Closed Closed Closed Open Open Open 3.00 Closed Closed Closed Closed Closed Open Open Open 3.50 Closed Closed Closed Open Open Open Open Open

1 Throttle T-piece duct 2 Hose clamp 3 Quarter wave resonator 4 Full load breather connector stub 5 LH (left hand) air cleaner outlet tube 6 Hose clamp 7 LH air cleaner 8 LH air cleaner lower intake duct 9 LH air cleaner center intake duct 10 Hose clamp 11 LH air cleaner intake scoop 12 Quarter wave resonator 13 RH air cleaner support intake duct 14 RH (right hand) air cleaner intake scoop 15 RH air cleaner center intake duct 16 RH air cleaner lower intake duct 17 RH air cleaner 18 Hose clamp 19 RH air cleaner outlet tube 20 Quarter wave resonator 21 Hose clamp 22 Mounting grommet and bracket 23 Bypass valve actuator connector stub Air intake scoops and ducts supply air from behind the front crossmember to the air cleaners. The air intake scoops, ducts and
air cleaner are locked together by latches and matching recesses molded into the mating joint faces.

The air cleaners are located in the forward corners of the engine compartment, on the fender front aprons. Each air cleaner is
located on the related fender front apron and front side member by two supports, and secured to a bracket at the top of the
fender front apron by a bolt and grommet. AIR INTAKES, AIR CLEANERS AND AIR DUCTS

9 Support 10 Inlet connection 11 Outlet connection 12 MAFT sensor The outlet tubes and T-piece duct direct the air from the air cleaners to the electric throttle. Hose clamps connect the outlet
tubes and T-piece duct together, and to the air cleaners and the electric throttle. A grommet and bracket attached the T-piece
duct to a bracket on the RH cylinder head. The two outlet tubes and the T-piece duct each incorporate a quarter wave resonator to reduce air induction noise.
The LH (left-hand) outlet tube incorporates a connector stub for the engine full load breather pipe.
The T-piece duct incorporates a connector stub for the vacuum tube of the bypass valve actuator on the supercharger.

SUPERCHARGER AND INTAKE MANIFOLDS

The SC increases the pressure, and thus mass, of the air supplied to the engine, to increase the engine's power output. Two separate intake manifolds direct air from the SC to the cylinder inlet ports.
The intake manifolds are attached to their related cylinder heads and the sides of the SC. Two dowels locate the SC in position on the cylinder block. A charge air cooler tank top is installed on top of the SC and intake manifolds to form the air duct from the SC outlet to the intake manifolds. A charge air cooler is installed in each intake manifold.
The charge air cooler tank top incorporates four studs for the attachment of the engine cover. A NVH (noise, vibration and
harshness) pad is attached to the side of each intake manifold.

13 Bypass valve 14 SC 15 Gasket 16 RH intake manifold 17 M08 x 30 mm crew (3 off) 18 M08 x 50 mm screw 19 N.H. pad 20 M6 x 15 mm screw (4 off) 21 M08 x 45 mm screw (4 off) 22 RH charge air cooler 23 M08 x 150 mm screw Supercharger

The SC is a Roots blower with high angle helix rotors driven at 2.1 x engine speed by the secondary belt of the accessory drive.
The two rotors of the SC are contained in a housing. The ends of the rotors are supported in bearings in the front cover and the bearing plate. A rear cover seals the bearing plate and incorporates a filler/level plug for lubricant. A pulley transfers power
from the accessory drive to the shaft of one of the rotors.

A pneumatic actuator on the front cover is attached to a by-pass valve in the housing. The bypass valve regulates a flow of air
from the outlet of the SC back to the inlet side of the rotors, to control the outlet pressure of the SC. Hoses connect the pneumatic actuator to the throttle T-piece of the air ducts, upstream of the electric throttle, and to the front cover, downstream
of the electric throttle. A lever connects the actuating rod of the pneumatic actuator to the shaft of the bypass
valve. A screw in the front cover limits movement of the lever in the closed direction to allow calibration of the SC output. The front cover also incorporates:

The SC air inlet and mounting face for the electric throttle. A connector stub for the part load breather.
A MAP (manifold absolute pressure) sensor.
A connector stub for a hose from the EVAP (evaporative emission) canister purge valve.
Intake Manifolds

Each intake manifold is attached to the SC with three screws and a bolt. Two dowels ensure correct alignment of each intake manifold. The RHD (right-hand drive) intake manifold incorporates a connection port for the noise feedback system. The LH intake manifold incorporates:
A connector stub for the brake vacuum system.
A MAPT (manifold absolute pressure and temperature) sensor.

Published: 11-May-2011
Intake Air Distribution and Filtering - V8 S/C 5.0L Petrol - Intake Air
Distribution and Filtering
Diagnosis and Testing

Principles of Operation

For a detailed description of the intake air distribution and filtering system and operation, refer to the relevant Description and
Operation section of the workshop manual. REFER to: (303-12D Intake Air Distribution and Filtering - V8 S/C 5.0L Petrol)

Intake Air Distribution and Filtering (Description and Operation), Intake Air Distribution and Filtering (Description and Operation), Intake Air Distribution and Filtering (Description and Operation).
Inspection and Verification


CAUTION: Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not
guarantee confirmation of a fault and may also cause additional faults in the vehicle being checked and/or the donor vehicle.


NOTE: Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
1. Verify the customer concern.

2. Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection
Mechanical Electrical
Hoses and ducts (damage/connections)
Air cleaner element (contaminated/blocked)
Restricted air intake
Supercharger
Supercharger (cooling fan) drive belt
Supercharger seals and gaskets
Charge air coolers (damage/connection)
Mass Air Flow (MAF) sensor
Manifold Absolute Pressure (MAP) sensor
Manifold Absolute Pressure/Temperature (MAPT) 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, verify the symptom and refer to the Symptom Chart, alternatively check for
Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.

Symptom Chart

Symptom Possible Causes Action Vehicle does not
start/hard
starting/poor
performance
Restricted/Blocked air intake
Restricted/Blocked air
cleaner element Clear the restriction. Replace the air cleaner element as necessary.
Refer to the relevant workshop manual section. Excessive intake
noise
Intake pipe
disconnected/damaged after
the air cleaner
Air cleaner assembly
incorrectly
assembled/damaged Check the intake system and hoses for correct installation/damage.
Refer to the relevant workshop manual section. Lack of boost
Supercharger drive belt
broken/slipping
Supercharger fault
Supercharger air intake fault
Major air leakage (after the
supercharger) Check the supercharger and drive belt. Check the charge air coolers.
Refer to the relevant workshop manual section. Noise
Supercharger drive belt
slipping
Supercharger fault
Major air leakage (after the
supercharger) Check the supercharger and drive belt. Remove the supercharger drive
belt and recheck for noise. Turn the supercharger by hand and check
for excessive resistance. Check for excessive play at the supercharger
pulley. Check the charge air coolers. Refer to the relevant workshop
manual section.

Published: 30-Jan-2014
Intake Air Distribution and Filtering - V8 S/C 5.0L Petrol - Supercharger
Removal and Installation

Special Tool(s)


303-1449-01
Supercharger Installation Guide Pins - Threaded

303-1449-02
Supercharger Installation Guide Pins - Unthreaded Removal


CAUTION: If a new cylinder head has been installed, then new taptite bolts must be used to install the supercharger.
NOTES:


New taptite bolts when used cut their own threads on the first application.


Removal steps in this procedure may contain installation details.

1. Refer to: Battery Disconnect and Connect (414-01 Battery, Mounting and Cables, General Procedures).


2. WARNING: Do not work on or under a vehicle supported only by a jack.
Always support the vehicle on safety stands.
Raise and support the vehicle.

3. Refer to: Charge Air Cooler (303-12D Intake Air Distribution and Filtering - V8 S/C 5.0L Petrol, Removal and Installation).

4. Refer to: Throttle Body (303-04E Fuel Charging and Controls - V8 S/C 5.0L Petrol, Removal and Installation).

5. Refer to: Supercharger Belt (303-05 Accessory Drive - 5.0L, Removal and
Installation).

6. Refer to: Manifold Absolute Pressure (MAP) Sensor (303-14D Electronic Engine Controls - V8 S/C 5.0L Petrol, Removal and Installation).

Engine Controls - V8 S/C 5.0L Petrol, Removal and Installation).

14. Refer to: Supercharger Belt (303-05 Accessory Drive - 5.0L, Removal and
Installation).

15. Refer to: Throttle Body (303-04E Fuel Charging and Controls - V8 S/C 5.0L Petrol, Removal and Installation).

16. Refer to: Charge Air Cooler (303-12D Intake Air Distribution and Filtering - V8 S/C 5.0L Petrol, Removal and Installation).

17. Refer to: Battery Disconnect and Connect (414-01 Battery, Mounting and Cables, General Procedures). www.JagDocs.com