2010 JAGUAR XFR warning

7 Initiators 8 TPMS module 9 Instrument cluster


Tire Pressure Monitoring System (TPMS) System Operation

The controlling software for the Tire Pressure Monitoring System (TPMS) is located within a Tire Pressure Monitoring System
Module. The software detects the following:

When the tire pressure is below the recommended low pressure value - under inflated tire.
The location of the tire on the vehicle that is below the recommended pressure.
Malfunction warning.

The TPMS system comprises:

Tire pressure monitoring system module located below the right-hand front seat.
Tire pressure receiver located near the gear shifter within the floor console.
Two front initiators positioned forward of the wheels and behind the fender splash shields.
Two rear initiators positioned rearward of the wheels and assembled on dedicated brackets located behind the fender
splash shields.
Four sensors, each sensor is integral with a tire valve and located within the tire; the space saver spare wheel is not
fitted with a sensor.

The four initiators are hard wired to the TPMS module. The initiators transmit 125 KHz Low Frequency (LF) signals to the tire
pressure sensors which respond by modifying the mode status within the Radio Frequency (RF) transmission. The 315 or 433
MHz RF signals are detected by the tire pressure receiver which is connected directly to the TPMS module. The received RF
signals from the tire pressure sensors are passed to the TPMS module and contain identification, pressure, temperature and
acceleration information for each wheel and tire.

The TPMS module communicates with the instrument cluster via the medium speed CAN bus to provide the driver with
appropriate warnings. The TPMS module also indicates status or failure of the TPMS or components.

Tire Location and Identification

The TPMS can identify the position of the wheels on the vehicle and assign a received tire pressure sensor identification to a
specific position on the vehicle, for example front left, front right, rear left and rear right. This feature is required because of
the different pressure targets and threshold that could exist between the front and rear tires.

The wheel location is performed automatically by the TPMS module using an 'auto-location' function. This function is fully
automatic and requires no input from the driver. The TPMS module automatically re-learns the position of the wheels on the
vehicle if the tire pressure sensors are replaced or the wheel positions on the vehicle are changed.
The TPMS software can automatically detect, under all operating conditions, the following:
one or more new tire pressure sensors have been fitted
one or more tire pressure sensors have stopped transmitting
TPMS module can reject identifications from tire pressure sensors which do not belong to the vehicle
two 'running' wheels on the vehicle have changed positions.

If a new tire pressure sensor is fitted on any 'running' wheel, the module can learn the new sensor identification automatically
through the tire learn and location process.

The tire-learn and location process is ready to commence when the vehicle has been stationary or traveling at less than 12
mph (20 km/h) for 15 minutes. This is known as 'parking mode'. The learn/locate process requires the vehicle to be driven at
speeds of more than 12 mph (20 km/h) for 15 minutes. If the vehicle speed reduces to below 12 mph (20 km/h), the learn
process timer is suspended until the vehicle speed increases to more than 12 mph (20 km/h), after which time the timer is
resumed. If the vehicle speed remains below 12 mph (20 km/h) for more than 15 minutes, the timer is set to zero and process
starts again.

Low Pressure Monitoring

The tire low pressure sensor transmits by RF (315 MHz or 433 MHz depending on market) signal. These signals contain data
which corresponds to tire low pressure sensor identification, tire pressure, tire temperature, acceleration and tire low pressure
sensor mode.

Each time the vehicle is driven, the tire pressure monitoring system module activates each LF antenna in turn. The
corresponding tire low pressure sensor detects the LF signal and responds by modifying the mode status within the RF
transmission.

The system enters 'parking mode' after the vehicle speed has been less than 20 km/h (12.5 miles/h) for 12 minutes. In parking
mode the tire low pressure sensors transmit a coded signal to the tire pressure monitoring system module once every 13
hours. If the tire pressure decreases by more than 0.06 bar (1 lbf/in²) the tire low pressure sensor will transmit more often as
pressure is lost.

As each wheel responds to the LF signal from the tire pressure monitoring system module, it is assigned a position on the
vehicle and is monitored for the remainder of that drive cycle in that position.

The TPMS uses active tire pressure sensors which are located on each wheel, inside the tire cavity. The sensor incorporates the
tire valve and is secured in the wheel by a nut on the outside of the wheel. The sensor contains a Printed Circuit Board which
houses a PTC (positive temperature coefficient)sensor, a Piezo pressure sensor, a radio receiver and transmitter and a lithium
battery.

The tire pressure sensors use the PTC sensor and the Piezo sensor to periodically measure the pressure and temperature of
the air inside the tire. The data is transmitted by RF data signals at either 315 MHz or 433 MHz dependant on market
requirements.

The RF transmission from the sensor contains a unique identification code in its transmission data. This allows the TPMS to
identify the wheel on the vehicle. If the sensor is replaced on a wheel, the new sensor identification will be learnt through the
learn and location process.

The tire pressure sensor can also detect when the wheel is rotating. In order to preserve battery power, the sensor uses
different transmission rates when the wheel is stationary or moving.


NOTE: For important information regarding the removal and fitting of tire pressure sensors and associated valves, see the
Tire Changing section.

Instrument Cluster Indications



Item Description 1 Low tire pressure warning indicator 2 Message center Tire Pressure Sensor

The warning indications to the driver are common on all vehicles fitted with TPMS. The driver is alerted to system warnings by
a low tire pressure warning indicator in the instrument cluster and an applicable text message in the message centre.

The TPMS module passes system status information to the instrument cluster on the medium speed CAN bus. The instrument
cluster converts this data into illumination of the warning indicator and the display of an appropriate message.
When the ignition is switched on, the warning indicator is illuminated for 3 seconds for a bulb check.


NOTE: If the vehicle is not fitted with the TPMS, the warning indicator will not illuminate.

The instrument cluster checks, within the 3 second bulb check period, for a CAN bus message from the TPMS. During this time
the TPMS performs internal tests and CAN bus initialization. The warning indicator will be extinguished if the TPMS module
does not issue a fault message or tire pressure warning message.

If a TPMS fault warning message is detected by the instrument cluster at ignition on, the warning indicator will flash for 72
seconds after the 3 second bulb check period and then remain permanently illuminated.

If a tire pressure warning message is detected by the instrument cluster at ignition on, the warning indicator will extinguish
briefly after the 3 second bulb check period, before re-illuminating to indicate a tire pressure warning.
The following table shows the warning indicator functionality for given events:

Event Instrument Cluster Indications Low pressure warning limit reached in one wheel
Warning indicator illuminated. 'CHECK TYRE PRESSURE' message displayed
and applicable tire highlighted on display. Low pressure warning limit reached in one or
more wheels in low speed mode (only if programmed or learning) Warning indicator illuminated. 'CHECK ALL TYRE PRESSURES' message
displayed. TPMS fault
Warning indicator flashes for 72 seconds and is then permanently
illuminated. The flash sequence repeats after ignition on cycle. 'TYRE
PRESSURE SYSTEM FAULT' message displayed. No transmission from a specific tire pressure
sensor or Specific tire pressure sensor fault Warning indicator flashes for 72 seconds and is then permanently
illuminated. The flash sequence repeats after ignition on cycle. 'TYRE NOT
MONITORED' message displayed. No transmission from more than one tire pressure
sensor or more than one tire pressure sensor
fault Warning indicator flashes for 72 seconds and is then permanently
illuminated. The flash sequence repeats after ignition on cycle. 'TYRE
PRESSURE SYSTEM FAULT' message displayed. CAN (controller area network) signals missing
Warning indicator flashes for 72 seconds and is then permanently
illuminated. The flash sequence repeats after ignition on cycle. 'TYRE
PRESSURE SYSTEM FAULT' message displayed. Vehicle enters high speed mode (only available in
certain markets) Warning indicator illuminated. 'TYRE PRESSURE LOW FOR SPEED' message displayed.

Wheels and Tires - Wheels and Tires
Diagnosis and Testing

Principle of Operation Published: 11-May-2011

For a detailed description of the wheels and tires, refer to the relevant Description and Operation section in the workshop
manual. REFER to: (204-04 Wheels and Tires)

Wheels and Tires (Description and Operation), Wheels and Tires (Description and Operation), Wheels and Tires (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 tested and/or the donor vehicle.

1. Verify the customer complaint. As much information as possible should be gathered from the driver to assist in
diagnosing the cause(s). Confirm which of the following two warning types (A or B) exist for the Tire Pressure
Monitoring System when the ignition status is switched from 'OFF' to 'ON'
(A) Check Tire Pressure Warnings. A low tire pressure warning will continuously illuminate the low tire
pressure warning lamp. This warning may be accompanied by a text message such as CHECK TIRE PRESSURE
(refer to owner literature). The manufacturer approved diagnostic system does NOT need to be used. Diagnostic
Trouble Codes (DTCs) are not generated with this type of warning. To extinguish this warning it is essential that,
with the ignition 'ON', all vehicle tires (including the spare) are to be set to the correct pressure as stated in the
vehicle handbook or as indicated on the placard label in the passenger/driver door aperture. It is not necessary
to drive the vehicle to clear 'check tire pressure' warnings - just changing the tire pressure causes the tire
low pressure sensor to transmit new data.
NOTES:

The tire pressures should be set by:
Using a calibrated tire pressure gauge
With 'cold' tires (vehicle parked in the ambient temperature for at least one hour, not in a garage with an
artificial ambient temperature)

If the tire pressure warning does not clear within two minutes, it is likely that the gauge is not correctly
calibrated or the tires are 'warm'. Carry out the following steps until the warning has cleared:

Increase the tire pressures by 3psi
Wait a further two minutes
When the tires are at ambient temperature and a calibrated gauge is available, reset the tire pressures
to the correct pressure.

Tire pressure adjustments are part of routine owner maintenance. Tire pressure adjustments that are
required due to a lack of owner maintenance are not to be claimed under vehicle warranty.

(B) System Fault Warnings. When a system fault is detected, the low tire pressure warning lamp will flash for
approximately 75 seconds prior to being continuously illuminated. Visually inspect for obvious signs of damage
and system integrity. Check for the presence of tire low pressure sensors on all four wheels (note: a tire low
pressure sensor has a metal valve stem rather than a rubber one).
2. Check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.

NOTE: If the tester fails to communicate with the Tire Pressure Monitoring System module, the following actions are
recommended:

Remove the Tire Pressure Monitoring System power supply fuse, inspect and re-install (if intact). Test to see if
communications have been re-established.

Remove the Tire Pressure Monitoring System ignition fuse (if applicable), inspect and re-install (if intact). Test to see if
communications have been re-established.
With ignition status set to 'ON', refer to the electrical circuit diagrams and check Tire Pressure Monitoring System
module for power, ignition and ground supplies .
Carry out CAN network integrity test using the manufacturer approved diagnostic system.

DTC Index


CAUTION: When probing connectors to take measurements in the course of the pinpoint tests, use the adaptor kit, part
number 3548-1358-00

1 Check for additional DTCs: C1A5631, C1A5831, C1A6031 or C1A6231 Is a C1A5631, C1A5831, C1A6031 or C1A6231 DTC also logged?
Yes
Refer to the DTC Index and remedial actions.
No
GO to G3. G3: CHECK INITIATOR INSTALLATION 1 Check for correct installation of Initiator. REFER to: (204-04 Wheels and Tires) Tire Pressure Monitoring System (TPMS) Front Antenna (Removal and Installation), Tire Pressure Monitoring System (TPMS) Rear Antenna (Removal and Installation). Is the Initiator correctly installed?
Yes
GO to G4. No
Rectify as required. REFER to: (204-04 Wheels and Tires)
Tire Pressure Monitoring System (TPMS) Front Antenna (Removal and Installation), Tire Pressure Monitoring System (TPMS) Rear Antenna (Removal and Installation). G4: CHECK FOR SHORT CIRCUIT IN INITIATOR HARNESS 1 Locate and remove module blue connector L. 2 Measure the resistance across the relevant initiator circuits within the blue connector. Is the resistance less than 1 Ohm?
Yes
A value of less than 1 Ohm indicates a short circuit, rectify the short circuit as required.
No
Install the correct tire low pressure sensor, of correct frequency, in accordance with that defined in the
manufacturer approved diagnostic system new tire low pressure sensor application, to the position
identified by the logged DTC.
REFER to: Tire Low Pressure Sensor (204-04 Wheels and Tires, Removal and Installation).
PINPOINT TEST H : SPARE TIRE LOW PRESSURE SENSOR NO OPERATION TEST
CONDITIONS DETAILS/RESULTS/ACTIONS H1: ESTABLISH THE TYPE OF SPARE WHEEL AND TIRE ASSEMBLY INSTALLED 1 Establish the type of spare wheel and tire assembly Installed. Is the spare wheel a mini/space saver type? Yes
Tire low pressure sensors are not installed to mini/space-saver spare wheels. Tire low pressure sensors
are installed to full size spare wheels only. The DTC is to be ignored and no repair action is required.
No
GO to H2. H2: ESTABLISH THAT THE SPARE WHEEL HAS A TIRE LOW PRESSURE SENSOR INSTALLED 1 Establish that the spare wheel has a tire low pressure sensor installed, considering the following additional information:

a) As a visual confirmation, the tire low pressure sensor has a metal valve stem rather than a rubber
one. Is a tire low pressure sensor installed? Yes
GO to H3. No
A new spare tire low pressure sensor should be installed. Note: Refer to the note above the DTC index
about replacing components which may remain under manufacturer warranty. Refer to the relevant section
of the workshop manual. H3: CONFIRM OPERATION OF THE SPARE WHEEL PRESSURE SENSOR 1 Deflate the spare tire, in close proximity to the vehicle, until it is completely deflated. 2 Complete an ignition cycle to ignition on and verify that the instrument cluster reports a spare tire pressure warning for approximately 20 seconds. 3 Re-inflate the spare tire, in close proximity to the vehicle, to the recommended spare tire pressure. 4 Complete an ignition cycle to ignition on and verify that the instrument cluster no longer reports a spare tire pressure warning. Does the instrument cluster continue to report a spare tire pressure warning? Yes
GO to H4. No
No repair action is required. It is possible that the customer may have placed items in the vehicle's luggage compartment that prevented correct RF reception. H4: VERIFY THAT THE SPARE TIRE LOW PRESSURE SENSOR ID HAS BEEN CORRECTLY PROGRAMMED TO THE
MODULE 1 Remove tire low pressure sensor. Record the 8 character hexadecimal ID written on the casing. 2 Use the approved diagnostic system to read the spare tire sensor ID from the module. Refer to the relevant procedure in the workshop manual. 3 Compare the IDs from steps 1 & 2.

Wheels and Tires - Tire Low Pressure Sensor
Removal and Installation

Removal


NOTE: Removal steps in this procedure may contain installation details. Published: 11-May-2011


1. WARNING: Make sure to support the vehicle with axle stands.

Raise and support the vehicle.

2. Refer to: Wheel and Tire (204-04 Wheels and Tires, Removal and Installation).

3. Remove the tire from the wheel, release the tire bead from the rim 180
degrees from the valve.

4.
5.
Discard the tire valve and retaining nut. www.JagDocs.com

Installation
1. CAUTIONS:
Make sure that the seal is correctly located.
Make sure that new components are installed.

Install the washer and seal, making sure the valve remains
pressed fully onto its seat.







2. WARNINGS:


Make sure that any corrosion or dirt is removed from the
mating surfaces.


Make sure that a new tire valve, valve core, seal, washer,
cap and retaining nut is installed.
CAUTIONS:


Use lint free cloth.


Only use moderate force when installing the sensor.


NOTE: Only tighten the nut finger tight at this stage.

Install the tire low pressure sensor and support the
sensor body in position.
Support the back of the valve stem in order to prevent
rotation to the tire low pressure sensor body.
Gently push the nut towards the center of the wheel.
Tighten the nut.

Torque: 8 Nm
3. Install the tire and balance the wheel.

4. Refer to: Wheel and Tire (204-04 Wheels and Tires, Removal and Installation).


5. WARNING: Make sure to support the vehicle with axle stands.
Lower the vehicle.

Published: 11-May-2011
Wheels and Tires - Tire Pressure Monitoring System (TPMS) Front Antenna
Removal and Installation

Removal


NOTE: Removal steps in this procedure may contain installation details.


1. WARNING: Make sure to support the vehicle with axle stands.

Raise and support the vehicle.

2. NOTES:

This step requires the aid of another technician.
Lower the radiator splash shield enough to access the tire pressure
monitoring system front antenna.

Note the position of the component before removal.




Installation


1. CAUTION: Make sure that the component is secured in the retainer.


NOTE: Make sure that the component is installed to the noted
removal position.
To install, reverse the removal procedure.