Jaguar XJ (X350). Manual — part 96

Specifications for the wheels and tires (pressures, torques, etc) can be found at the same link.

When replacing wheels or tires you must comply with local legislation regarding health and safety

and correct fitment.

If the vehicle is fitted with TPMS, only Jaguar approved wheels and tyres should be used. If the wheel

and tyre size is changed (for example from R18 to R20) the TPMS module should be updated with the

correct pressure information appropriate to the new wheel and tyre set. Update the TPMS module

using the Jaguar approved diagnostic system.

As a general guideline, only replace tires in pairs or as a set, and only with tires of equivalent size and

specification.

Confirm the symptoms of the customer complaint.

As much information as possible should be gathered from the driver to assist in diagnosing the

cause(s).

1 . Before a road test, carry out a basic inspection to make sure the vehicle is safe and legal to drive.

Basic inspection

•

Correct tire inflation.

Specifications

•

Legal tire tread depth.

•

Cuts/Bulges in tire sidewall(s).

•

Tire ply separation.

•

Embedded objects.

•

Wheel rim damage.

•

Correct tire fitment (specification, direction of rotation, etc).

•

Any obvious distortion of the tire (flat/high spots).

•

Worn/Damaged steering or suspension components.

Front Suspension

Rear Suspension

Road test

If the results of the basic inspection are acceptable, carry out a road test to confirm the symptoms.

To reproduce the symptoms, test the vehicle on similar roads to those on which the fault occurs and

at similar speeds (provided it is legal to do so).

If the vibration or noise can be reproduced, note the speed at which it occurs and see if it is possible

to drive through the symptom, meaning, is it possible to alter the fault by driving faster or slower

than the speed at which it occurs?

If it is possible, it is likely that the fault is caused by an imbalance in the wheel or tire.

If the vibration or noise gets worse as the vehicle speed increases, it is likely that the fault is caused

by distortion in the wheel or tire, or worn or damaged components.

Distortion checks

Check for distortion by raising the vehicle so that the wheels are free and placing an axle stand or

similar fixed object next to each wheel in turn.

If the stand is placed at the tread of the tire, the tire can be checked for ovality by turning the wheel

by hand and checking for high or low spots where the gap between the tread and the stand increases

or reduces.

If the stand is placed next to the wheel rim or tire sidewall, the wheel and tire can be checked for

run-out in a similar way.

Pinpoint tests

NOTE:

When performing 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.

NOTE:

If DTCs are recorded and a fault is not present when performing the pinpoint tests, an

intermittent concern may be the cause. Always check for loose connections and corroded

terminals.

PINPOINT TEST G528618p1 :
EXTERNAL ANTENNA NO
CONNECTION

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G528618t1 : Check the external antenna signal circuit for short circuit to
ground

1. Key off. 2. Disconnect the TPMS external antenna electrical connector, CR99. 3.

Measure the resistance between:

CR99, harness side

Battery

Pin 01, signal

Negative terminal

•

Is the resistance less than 10,000 ohms?

-> Yes

GO to Pinpoint Test

G528618t44

.

-> No

GO to Pinpoint Test

G528618t2

.

G528618t2 : Check the external antenna signal circuit for short circuit to
power

1. Measure the resistance between:

CR99, harness side

Battery

Pin 01, signal

Positive terminal

•

Is the resistance less than 10,000 ohms?

-> Yes

GO to Pinpoint Test

G528618t45

.

-> No

GO to Pinpoint Test

G528618t3

.

G528618t44 : Check whether the short circuit is in the harness or the
module

1. Disconnect the TPMS module connector, CR96. 2.

Measure the resistance between:

CR99, harness side

Battery

Pin 01, signal

Negative terminal

•

Is the resistance less than 10,000 ohms?

-> Yes

REPAIR the short circuit. For additional information, refer to the wiring diagram. Clear the DTC and

test the system for normal operation.

-> No

INSTALL a new TPMS control module.

Tire Pressure Monitoring System (TPMS) Module

G528618t45 : Check whether the short circuit is in the harness or the
module

1. Disconnect the TPMS module connector, CR96. 2.

Measure the resistance between:

CR99, harness side

Battery

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