TIRE PRESSURE MONITOR SYSTEMS

• HEADINGS
  • DESCRIPTION & OPERATION
    • TIRE PRESSURE MONITOR (TPM) SYSTEM
    • TIRE PRESSURE MONITOR WARNING DISPLAY
  • RESET PROCEDURES
    • STORING TIRE INFLATION PRESSURES
    • WHEEL CHANGE INITIALIZATION
  • DISMOUNTING/MOUNTING PROCEDURES
    • TIRE PRESSURE SENSOR
      • Removal
      • Installation
  • TORQUE SPECIFICATIONS
• FIGURES
  • Fig. 1: Identifying TPM System Function Controls
  • Fig. 2: Identifying Starting Menu
  • Fig. 3: Storing Tire Pressure (1 Of 2)
  • Fig. 4: Storing Tire Pressure (2 Of 2)
  • Fig. 5: Initializing New Wheels
  • Fig. 6: Removing & Installing Tire Pressure Sensor
  • Fig. 7: Removing & Installing Tire Pressure Sensor Nut
  • Fig. 8: Exploded View Of Tire Pressure Sensor
• TABLES
  • Tire Pressure Sensor Part Identification
  • TORQUE SPECIFICATIONS

TIRE PRESSURE MONITOR SYSTEMS

Audi - A4 & S4 - 2006-08

DESCRIPTION & OPERATION

NOTE:

Whenever tire pressure is adjusted, the adjusted pressure has to be stored again. If tire or tire pressure sensor was changed, the TPMS must be initialized. See RESET PROCEDURES.

TIRE PRESSURE MONITOR (TPM) SYSTEM

The Tire Pressure Monitor (TPM) system is used for continuous monitoring of tire pressure in all 4 road wheels and the spare tire while the vehicle is moving. It assists the driver in checking tire pressures, and provides warning messages on the instrument cluster and in a center instrument cluster display in case of loss of tire pressure.

If the tire pressure monitoring system is not available, a tire symbol with a slash through it appears in the center instrument cluster display. This could be caused by the following:

• If this symbol is displayed at the end of a learning phase, it means that the system cannot recognize which wheels are mounted on the vehicle. This may be because one or more wheels were mounted lacking a wheel sensor.
• A wheel sensor or other component may have failed.
• The system recognizes more than 5 wheels are present on the vehicle (i.e., when additional winter tires are being transported on the vehicle and are transmitting data).
• A wheel was changed, and the new tire was not initialized.
• If vehicle is being operated with snow chains, system function can be affected by the shielding effect of the chains.
• System is not available due to a malfunction.
• Other transmitting devices with the same frequency (i.e., headphones with integrated radio) are emitting an electro-magnetic field which can cause temporary interference in the system.

NOTE:

If system is malfunctioning due to interference, eliminate cause of interference and re-initialize system.

TIRE PRESSURE MONITOR WARNING DISPLAY

As soon as the tire pressure monitoring system senses a significant loss of air pressure in one or more tires, text messages and Yellow symbols appear in the instrument cluster display. The system continuously receives radio signals from sensors located inside each tire.

The low pressure warning light in the instrument cluster illuminates when:

• Tire pressure is 7 psi (48 kPa) lower than it should be.
• Tire pressure falls below 23 psi (159 kPa).
• Tire pressure is 25 percent lower than what is specified on tire pressure label.

The center instrument cluster display will also show a flat tire symbol, along with a text message which reads "PLEASE CHECK TYRE PRESSURE". After a few seconds, message is replaced by the regular display (press CHECK button to show message again).

Check and correct tire inflation pressures of wheels on vehicle (including spare tire). Tire pressure information is provided on the tire pressure label located on driver's side door pillar. After checking inflation pressures and properly inflating tires, current pressures have to be stored in monitoring system. System then implements automatic adaptation process.

RESET PROCEDURES

NOTE:

Whenever tire pressure is adjusted (i.e., when readjusting tire pressure for a load condition), the adjusted pressure has to be stored again. See STORING TIRE INFLATION PRESSURES. If tire or tire pressure sensor was changed, the TPMS must be initialized. See WHEEL CHANGE INITIALIZATION.

When the tire pressure warning light illuminates and warning message appears, immediately check air pressure of all tires and adjust to the specified pressure. Store new pressures. Ensure warning indicators go out.

STORING TIRE INFLATION PRESSURES

NOTE:

Whenever tire pressure is adjusted, the adjusted pressure has to be stored again.

1. Ensure air pressure in all tires (including spare tire) is properly adjusted to specification.
2. Push RESET button until "DISPLAY TYPE" menu is shown. See Fig. 1 and Fig. 2 .
3. Push in the upper (lower) protrusion on the function selector switch to select the "SET" option.
4. Push RESET button.
5. Push in the upper (lower) protrusion on the function selector switch to select "TYRE PRESSURE" option. See Fig. 3.
6. Push RESET button.
7. Push in the upper (lower) protrusion on the function selector switch to select "STORE PRESSURES" option. See Fig. 4.
8. After the tire pressures have been saved, the system will measure the actual pressures once again, and then save these as the new pressures.

Fig. 1: Identifying TPM System Function Controls
Courtesy of AUDI OF AMERICA, INC.

Fig. 2: Identifying Starting Menu
Courtesy of AUDI OF AMERICA, INC.

Fig. 3: Storing Tire Pressure (1 Of 2)
Courtesy of AUDI OF AMERICA, INC.

Fig. 4: Storing Tire Pressure (2 Of 2)
Courtesy of AUDI OF AMERICA, INC.

WHEEL CHANGE INITIALIZATION

NOTE:

If tire was changed, the new tire must be initialized. Tire change is incomplete if initialization process is not performed.

NOTE:

Initialization process can take up to 20 minutes. During this time, the sensors are readjusting to the new wheel/tire combination and the monitoring system is operating at reduced sensitivity. The system will only warn when tire pressure drops below the minimum permissible specified pressure (warning symbol and message will appear).

1. Ensure air pressure in all tires (including spare tire) is properly adjusted to specification.
2. Push RESET button until "DISPLAY TYPE" menu is shown. See Fig. 1 and Fig. 2 .
3. Push in the upper (lower) protrusion on the function selector switch to select the "SET" option.
4. Push RESET button.
5. Push in the upper (lower) protrusion on the function selector switch to select "TYRE PRESSURE" option. See Fig. 3.
6. Push RESET button.
7. Push in the upper (lower) protrusion on the function selector switch to select "WHEEL CHANGE" option. See Fig. 5.

Fig. 5: Initializing New Wheels
Courtesy of AUDI OF AMERICA, INC.

DISMOUNTING/MOUNTING PROCEDURES

CAUTION:

The tire should be dismounted from the wheel using the tire changer manufacturer's instructions. Use the following information to avoid damage during the dismounting/mounting procedures.

CAUTION:

When tires are replaced, the sensors and valves must not be detached or exchanged. Only the valve core needs to be replaced. DO NOT replace the valve and wheel electronics unless necessary.

CAUTION:

Mixed installation of SST (PAX system)and standard tires is not permitted. A standard tire can only be installed in exceptional cases for a short time. The driver must be explicitly informed of the exceptional nature of this installation and that the run-flat characteristics no longer apply.

NOTE:

Tire pressure is also dependent on temperature of the tire. For every 18°F (10°C) increase in tire temperature, tire pressure increases about 1.5 psi (10 kPa). Tire pressure should only be adjusted when tires are cold (about the same as ambient air temperature).

NOTE:

Whenever tire pressure is adjusted, the adjusted pressure has to be stored again. If tire or tire pressure sensor was changed, the TPMS must be initialized. See RESET PROCEDURES.

TIRE PRESSURE SENSOR

Removal

CAUTION:

The tire pressure sensor must not come into contact with water or be blown with compressed air when cleaning the wheel or wheel rim.

NOTE:

The valve insert of the tire pressure sensor must be replaced each time tire is changed.

NOTE:

To perform this procedure, Torque Wrench (V.A.G. 1410) is required.

1. Remove tire and wheel assembly from vehicle.
2. Dismount tire from wheel following tire changer manufacturer's instructions while paying special attention to the following to avoid damaging the pressure sensor:
   • Remove valve insert to release air from tire before removing tire.
   • Press tire off both rim edges on opposite side to metal valve.
   • Turn wheel on tire mounting equipment so that the valve/tire pressure sensor is opposite the mounting head.
3. While counterholding sensor (for example, with a 2-mm twist drill), remove tire pressure sensor. See Fig. 6.
4. While counterholding sensor, remove nut and metal valve. See Fig. 7 and Fig. 8 .

Fig. 6: Removing & Installing Tire Pressure Sensor
Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig. 7: Removing & Installing Tire Pressure Sensor Nut
Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig. 8: Exploded View Of Tire Pressure Sensor
Courtesy of VOLKSWAGEN UNITED STATES, INC.

Installation

1. To identify replacement tire pressure sensors, see Tire Pressure Sensor Part Identification table.

   NOTE:

   The valve insert of the tire pressure sensor must be replaced each time tire is changed.

2. While counterholding sensor, install metal valve and tighten nut to 35 INCH lbs. (4 N.m). See Fig. 7.
3. While counterholding sensor, press tire pressure sensor against wheel rim and tighten nut to 35 INCH lbs. (4 N.m). See Fig. 6.
4. Mount tire on wheel following tire changer manufacturer's instructions, paying special attention to the following to avoid damaging tire pressure sensor:
   • Make sure that tire does not contact tire pressure sensor while mounting tire.
   • Turn the wheel on the tire mounting equipment so that valve/tire pressure sensor is opposite the mounting head.
5. Install tire and wheel assembly to vehicle.
6. Adjust inflation pressures of all tires (including spare tire), and balance tires. Store new tire pressures in system. See RESET PROCEDURES.

Tire Pressure Sensor Part Identification

Application	Part No.
Left Front	G222
Right Front	G223
Left Rear	G224
Right Rear	G225
Spare Tire	G226

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

Component		Ft. Lbs. (N.m)
Wheel Nut
Standard Tires		89 (120)
SST Tires (PAX System)		103 (140)
INCH Lbs. (N.m)
Tire Pressure Sensor Nut		35 (4)
Torx Fastener (T20)		35 (4)

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