Jaguar X-Type Sedan and Estate (Wagon). Service manual — part 22
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1
Road Conditions
An experienced technician will always establish a route that will be used for all NVH diagnosis road tests. The road selected should be
reasonably smooth, level and free of undulations (unless a particular condition needs to be identified). A smooth asphalt road that allows
driving over a range of speeds is best. Gravel or bumpy roads are unsuitable because of the additional road noise produced. Once the route
is established and consistently used, the road noise variable is eliminated from the test results.
• NOTE: Some concerns may be apparent only on smooth asphalt roads.
If a customer complains of a noise or vibration on a particular road and only on a particular road, the source of the concern may be the road
surface. If possible, try to test the vehicle on the same type of road.
Vehicle Preparation
Carry out a thorough visual inspection of the vehicle before carrying out the road test. Note anything which is unusual. Do not repair or
adjust any condition until the road test is carried out, unless the vehicle is inoperative or the condition could pose a hazard to the
technician.
After verifying the condition has been corrected, make sure all components removed have been installed.
Lift Test
After a road test, it is sometimes useful to do a similar test on a lift.
When carrying out the high-speed shake diagnosis or engine accessory vibration diagnosis on a lift, observe the following precautions:
WARNING: If only one drive wheel is allowed to rotate, speed must be limited to 55 km/h (35 mph) indicated on the speedometer
since actual wheel speed will be twice that indicated on the speedometer. Speed exceeding 55 km/h (35 mph) or allowing the drive wheel to
hang unsupported could result in tire disintegration, differential failure, constant velocity joint and driveshaft failure, which could cause
serious personal injury and extensive vehicle damage. Failure to follow these instructions may result in personal injury.
CAUTION: The suspension should not be allowed to hang free. W hen the CV joint is run at a very high angle, extra vibration as well as
damage to the seals and joints can occur.
The suspension lower arms should be supported as far outboard as possible. To bring the vehicle to its correct ride height, the full weight of
the vehicle should be supported in the rear by floor jacks. For additional information, refer to
REFER to:
Jacking
(100-02 Jacking and Lifting, Description and Operation).
1. Raise and support the vehicle. For additional information, refer to
REFER to:
Lifting
(100-02 Jacking and Lifting, Description and Operation).
1.
2. Explore the speed range of interest using the Road Test Quick Checks as previously described.
2.
3. Carry out a coast down in neutral. If the vehicle is free of vibration when operating at a steady indicated speed and behaves very
differently in drive and coast, a transmission concern is likely.
3.
Note, however, that a test on the lift may produce different vibrations and noises than a road test because of the effect of the lift. It is not
unusual to find vibrations on the lift that were not found in the road test. If the condition found on the road can be duplicated on the lift,
carrying out experiments on the lift may save a great deal of time.
Symptom Chart
Symptom
Possible Sources
Action
High-speed shake
Wheel end vibration
Engine/gearbox/transfer box
Driveline
GO to Pinpoint Test A.
Tip-in moan
Air cleaner
Power steering (PS)
Powertrain
Engine mounts
Exhaust system
GO to Pointpoint Test B.
Idle boom/shake/vibration, or shudder
Cable(s)/hoses(s)
Engine mounts
Exhaust system
Belt/pulleys
GO to Pinpoint Test C.
W heel end vibration analysis
Suspension/front or rear wheel drive half shaft and joints
Tires/wheels
Wheel bearings
Front or rear wheel drive half shaft joint boots
GO to Pinpoint Test D.
Non-axle noise
Trim/mouldings
A/C system
Accessories
GO to Pinpoint Test E.
Pinpoint Tests
• NOTE: These Pinpoint Tests are designed to take the technician through a step-by-step diagnosis procedure to determine the cause of a
condition. It may not always be necessary to follow the chart to its conclusion. Carry out only the Pinpoint Test steps necessary to correct
the condition. Then check operation of the system to make sure the condition is corrected.
After verifying that the condition has been corrected, make sure all components removed have been installed.
PINPOINT TEST A : HIGH-SPEED SHAKE
TEST CONDITIONS
DETAILS/RESULTS/ACTIONS
A1: NEUTRAL COAST
Carry out the neutral coast test.
1
1
1
1
1
1
1
1
Does the vibration disappear during the neutral coast test?
Yes
CHECK and INSTALL new engine/gearbox/transfer box mounts as necessary. REPEAT Road Test as outlined.
No
GO to D1
.
PINPOINT TEST B : TIP-IN MOAN
TEST
CONDITIONS
DETAILS/RESULTS/ACTIONS
B1: CHECK THE AIR CLEANER
Check the air cleaner.
Check the air cleaner, inlet tube, outlet tube, resonators and all other components associated with the air
induction system for correct installation and tightness of all connections.
Are the components OK?
Yes
GO to B2
.
No
CORRECT the condition. REPEAT the Road Test as outlined.
B2: CHECK THE EXHAUST SYSTEM
Carry out the exhaust system neutralizing procedure in this section.
Is the exhaust system OK?
Yes
GO to B3
.
No
REPAIR as necessary. RESTORE vehicle. REPEAT the Road Test as outlined.
B3: CHECK THE POWER STEERING
Remove the auxiliary drive belt and test for tip-in moan.
Is the tip-in moan OK?
Yes
REPAIR the power steering as necessary. For additional information, refer to
REFER to:
Power Steering Pump - 2.0L NA V6 - AJV6/2.5L NA V6 - AJV6/3.0L NA V6 - AJ27
(211-02 Power Steering,
Removal and Installation).
No
CHECK and INSTALL new engine/gearbox/transfer box mounts as necessary. REPEAT Road Test as outlined.
PINPOINT TEST C : IDLE BOOM/SHAKE/VIBRATION/SHUDDER
TEST
CONDITIONS
DETAILS/RESULTS/ACTIONS
C1: CHECK CABLE/HOSES
Check the engine compartment for any component that may be grounding between the engine and body or chassis.
Example: air conditioning (A/C) hoses.
Are the components OK?
Yes
GO to C2
.
No
CORRECT the condition. REPEAT the Road Test as outlined.
C2: CHECK THE DRIVER AIR BAG MODULE.
Remove the driver air bag module and visually inspect the for correct installation or any touch condition.
Is the driver air bag module OK?
Yes
GO to C3
.
No
CORRECT the condition. REPEAT the Road Test as outlined.
C3: CHECK THE COOLING RADIATOR
Check the engine cooling radiator mountings and bushings for security and condition. Check the radiator installation
for any component that may have a touch condition.
Are the installation and bushings OK?
Yes
GO to C4
.
No
CORRECT the condition. REPEAT the Road Test as outlined.
C4: CHECK THE EXHAUST SYSTEM
Carry out the exhaust system neutralizing procedure in this section.
Is the exhaust system OK?
Yes
CHECK and INSTALL new engine/gearbox/transfer box mounts as necessary. REPEAT Road Test as outlined.
No
REPAIR as necessary. REPEAT Road Test.
PINPOINT TEST D : WHEEL END VIBRATION ANALYSIS
TEST CONDITIONS
DETAILS/RESULTS/ACTIONS
D1: INSPECT THE TIRES
Inspect the tires.
Raise and support the vehicle. For additional information, refer to
REFER to:
Lifting
(100-02 Jacking and Lifting, Description and Operation).
inspect the tires for:
correct tire size
tire/wheel compatibility
wear or damage
tire beads correctly seated
1
1
1
1
1
1
1
Are the tires OK?
Yes
GO to D2
.
No
INSPECT the wheels. For additional information, refer to
REFER to:
Wheels and Tires
(204-04 Wheels and Tires, Diagnosis and Testing).
D2: INSPECT WHEEL BEARINGS
Inspect the wheel bearings. For additional information, refer to
REFER to:
Wheel Bearing Inspection
(204-00 Suspension System - General Information, General Procedures).
Are the wheel bearings OK?
Yes
GO to D3
.
No
REPAIR as necessary. REPEAT the Road Test as outlined.
D3: INSPECT THE REAR WHEEL DRIVE HALF SHAFT JOINT BOOTS
Inspect the rear wheel drive half shaft joint boots.
spin the rear tire by hand
inspect for evidence of cracks, tears, splits or splattered grease
Are the rear wheel drive half shaft joint boots OK?
Yes
GO to D4
.
No
REPAIR as necessary. REPEAT the Road Test as outlined.
D4: INSPECT THE FRONT WHEEL DRIVE HALF SHAFT JOINT BOOTS
Inspect the front wheel drive half shaft joint boots
spin the front tire by hand
inspect for evidence of cracks, tears, splits or splattered grease
Are the front wheel drive half shaft joint boots OK?
Yes
GO to D5
.
No
REPAIR as necessary. REPEAT the Road Test as outllined.
D5: INSPECT WHEEL AND TIRE RUNOUT
Inspect the wheel and tire runout.
Carry out the Wheel and Tire Check procedure. For additional information, refer to
REFER to:
Wheels and Tires
(204-04 Wheels and Tires, Diagnosis and Testing).
Is the wheel and tire runout OK?
Yes
Balance the wheels and tires. Refer to the wheel balance equipment manufacturers instructions.
No
REPAIR as necessary. REPEAT the Road Test as outlined.
PINPOINT TEST E : NON-AXLE NOISE
TEST
CONDITIONS
DETAILS/RESULTS/ACTIONS
E1: INSPECT VEHICLE TRIM
Check the grille and trim mouldings to see if they are the source of the noise.
Are the vehicle trim components causing the noise?
Yes
INSTALL new trim or REPAIR as necessary. For additional information, refer to
REFER to:
Exterior Trim
(501-08 Exterior Trim and Ornamentation, Description and Operation).
No
GO to E2
.
E2: CHECK THE A/C SYSTEM FOR NOISE
Check the A/C system components for noise by turning the A/C system on and off.
Is the A/C system causing the noise?
Yes
Diagnose the A/C system. For additional information, refer to
REFER to:
Climate Control System
(412-00 Climate Control System - General Information, Diagnosis and Testing).
No
GO to E3
.
E3: CHECK NON-FACTORY ACCESSORIES
Inspect any accessories for being the source of the noise. Example: grounding body-to-frame, antennas, visors, bug
deflectors and fog lights?
Are the accessories the cause of the noise?
Yes
ADJUST, REPAIR or INSTALL new accessories or fasteners as required.
No
Verify the customer concern
Published: 11-May-2011
Noise, Vibration and Harshness - Exhaust System Neutralizing
General Procedures
1. Loosen the muffler inlet pipe and resonator pipe to exhaust manifold
fasteners at the flanges and the muffler inlet connection.
2. Place a stand to support the muffler parallel to the vehicle frame with
the muffler pipe bracket free of stress.
3. Tighten the muffler connection.
4. Position the exhaust pipes to the manifolds and tighten. Make sure that
the catalytic converters and heat shields do not contact the frame rails.
5. With the complete exhaust system tight (and cooled) the rear hanger
insulator should be angled forward, to allow the system to expand
rearward when heated during normal running.
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