Tire Pressure Sensor: Service and Repair

Removal

Tire Removal
1. Deflate tire & remove balance weights.

CAUTION:
- The tire bead should be broken approx. 90° from the valve side of the wheel. The bead breaker should not be set too deep.
- Avoid tire/tool contact with the valve on dismount.
- Dismount should end near the valve.









Sensor Removal

CAUTION:
Handle the sensor with care.

1. Remove the valve nut.





CAUTION:
The valve nut should not be re-used.

2. Discard the valve assembly.

Installation

Sensor Fit

CAUTION:
- Handle the sensor with care.
- Avoid lubricant contact if possible.

1. Assemble valve to sensor and turn valve 3 times with the square part of the screw in the slot.





CAUTION:
- The fit should not be tight i.e. it should still be possible to easily adjust valve angle.
- Ensure that the wheel to be fitted is designed for sensor mount. There should normally be a mark to indicate this.
- Ensure that the valve hole and mating face of the wheel are clean.

2. Mount assembly to wheel.

CAUTION:
Ensure sensor feet are against the wheel throughout the remainder of the assembly process.

3. Tighten washer and nut by hand until the valve thread meets the nut built-in calibrated stop.

CAUTION:
Ensure that the grommet remains in contact with the wheel.




4. Using a torque wrench, tighten the nut to 2.95±0.37 lb-ft (4.0±0.5 Nm) It is normal to feel a break as the 1.7 lb-ft (2.3Nm) calibrated stop in the nut snaps and the torque falls.





CAUTION:
- Increase torque smoothly in order to achieve a clean break of the stop.
- Do not exceed allowed torque.
- Do not use electric or pneumatic tools.

Tire Fit

CAUTION:
Only use wheels designed to accommodate the TPMS sensor.

1. Lubricate the tire bead not the rim. Excessive lubrication should not be applied.
2. Start tire mounting approx. 5.9 in(15 cm) from valve.
3. Move the mounting tool away from the valve.

CAUTION:
Avoid tire / tool contact with the valve.

4. Finish with mounting tool near to valve.
5. Carry out inflation / pressure correction and then fit valve cap.

Sensor ID Writing (Wireless)
















Sensor ID Writing














Replacement

1. Remove valve core and deflate the tire. Use tire changing machine and break both beads. Make sure TPMS sensor is away from bead buster. Break bead at 90°, 180° and 270° to the valve.




2. When removing the tire, keep the TPMS sensor at the 12 o'clock position relative to the head of the tire changing machine. Do not hit sensor with the iron when prying up the bead. Rim should travel in the clockwise direction.




3. When the top bead is off, place the sensor at the 12 o'clock position relative to the head of the tire changing machine. Do not hit sensor with iron or bottom bead when prying up the bottom bead. Rim should travel in the clockwise direction.




4. To remove sensor, remove the prevailing torque hex nut using a 7 mm nut driver.




5. Carefully and firmly pull the sensor body straight back off the valve.




6. Attach a standard valve stem puller tool the valve. Remove the valve from the rim by pulling the valve bulb through the valve hole.




7. Assemble a new snap-in valve to the sensor body. Make sure the flats on valve lines up with the flats on the sensor body. Push the valve all the way into the hole until it stops.




8. Attach a new Learn prevailing torque hex nut to the valve body and use a preset 7mm nut driver to tighten the nut at a torque of 1.2 Nm. DO NOT OVER TIGHTEN! Make sure the hex nut is in contact with the metal insert on the sensor body.




9. Lubricate and place the valve in the valve hole.




10. Using the standard valve stem puller tool, pull the valve stem straight through the valve hole, and NOT at an angle. Stop pulling when the indicator ring on the valve has passed completely through the valve hole.




11. This picture shows a TPMS sensor with a bad fit. Note that the valve bulb is not resting on the rim. This will not provide a good rim seal at the valve hole.




12. This picture shows a TPMS sensor with a correct fit. Note that the valve bulb is resting against the rim.




13. Apply tire soap or lubrication to the top and bottom tire beads.




14. To fit the bottom bead, position the sensor at the 5 o'clock position relative to the head on the tire changing machine.




15. Place the tire on the rim so the bottom bead touches the edge of the rim after the sensor (@6 o'clock). Rotate the rim clockwise, and push down on the tire at the 3 o'clock position to fit bottom bead




16. After bottom bead is on tire, rotate the rim until the sensor is at the 5 o'clock position relative to the head on the tire changing machine. Push down on the tire at the 3 o'clock position and rotate the rim clockwise to fit the top bead.




17. Inflate the tire until both beads seat.




18. Adjust the tire inflation pressure according to the vehicle recommendation.
19.