Tire Pressure Sensor: Service and Repair

TIRE PRESSURE SENSOR

REMOVAL
1) Remove tire and wheel assembly from vehicle.

CAUTION: The cap used on this valve stem contains an O-ring seal to prevent contamination and moisture from entering the valve stem. Retain this valve stem cap for reuse. Do not substitute a regular valve stem cap in its place.

CAUTION: The valve stem used on this vehicle is made of aluminum and the core is nickel plated brass. The original valve stem core must be reinstalled and not substituted with a valve stem core made of a different material. This is required to prevent corrosion in the valve stem caused by the different metals.

Fig. 19 Start Mount/Dismount Tool Within 10Degrees Of Valve Stem:

Fig. 20 Sensor Mounting To Wheel:

2) Dismount tire from wheel following tire changer manufacturers instructions while paying special attention to the following to avoid damaging the pressure sensor:
a) When breaking the tire bead loose from the wheel rim, avoid using the Bead Breaker in the area of the sensor. That includes both front and rear beads of the tire.
b) When preparing to dismount the tire from the wheel, carefully insert the mounting/dismounting tool at the valve stem ±10° (Fig. 19), then proceed to dismount the tire from the wheel. Use this process on both the upper and lower tire beads.
3) Remove sensor nut retaining sensor to wheel (Fig. 20). While removing nut, hold pressure against rear of metal valve stem to keep valve stem from pushing rearward, damaging antenna strap.
4) Remove sensor from wheel (Fig. 20).

INSTALLATION

Fig. 21 Sensor Mounting - Exploded View:

NOTE: Before reinstalling an existing tire pressure sensor, replace seal and metal washer at base of valve stem to ensure proper sealing (Fig. 21).

1) Wipe area clean around sensor/valve stem mounting hole in wheel. Make sure surface of wheel is not damaged.

Fig. 22 Tire Pressure Sensor:

Fig. 23 Sensor Installation To Wheel:

CAUTION: To avoid damaging sensor antenna strap (Fig. 22), hold pressure against rear of metal valve stem (Fig. 23) while sensor is inserted through wheel mounting hole and nut is installed.

2) Insert sensor through wheel as shown keeping pressure against rear of metal valve stem. (Fig. 23). Potted side of sensor is to be positioned toward wheel. Do not attempt to mount sensor otherwise, damage may occur.
3) Install sensor nut (with pressed-in washer) by hand (Fig. 23).

Fig. 24 Seat Sensor Against Wheel Interior:

NOTE: Before tightening sensor nut, push downward on sensor housing in an attempt to make it flush with interior contour of wheel (Fig. 24).

4) While holding sensor in position, tighten sensor nut to 6.5 Nm (58 inch lbs.) torque.

CAUTION: Over-torquing the sensor nut by as little as 12 Nm (0.06 inch lbs.) may result in sensor separation from the valve stem. Under this condition, the sensor may still function, however, the condition should be corrected immediately.

Fig. 25 Mounting Tire Using Rotating Wheel Machine:

Fig. 26 Mounting Tire Using Rotating Tool Machine:

5) Mount tire on wheel following tire changer manufacturers instructions, paying special attention to the following to avoid damaging tire pressure sensor:
a) Rotating Wheel Tire Changers - Once the wheel is mounted to the changer, position the sensor valve stem approximately 210° from the head of the changer in a clockwise direction before rotating the wheel (also in a clockwise direction) to mount the tire (Fig. 25). Use this procedure on both the upper and lower tire beads.
b) Rotating Tool Tire Changers - Position the wheel on the changer so that the sensor valve stem is approximately 210° from the head of the changer in a clockwise direction from the mounting end of the tool (Fig. 26) Make sure the sensor is clear of the lower bead breaker area to avoid damaging the sensor when the breaker rises (Fig. 26). Rotate the tool in a counterclockwise direction to mount the tire. Use this procedure on both the upper and lower tire beads.
6) Adjust air pressure to that listed on Tire Inflation Pressure Label (Placard) provided with vehicle (usually applied to driver's side B-pillar). Make sure original style valve stem cap is securely installed to keep moisture out of sensor.
7) Install wheel and tire assembly on vehicle.
8) Drive vehicle for a minimum of five minutes while maintaining a continuous speed above 15 mph (24 km/h). During this time the system will learn the new sensor ID code and will clear any DTC's automatically.

NOTE: If a sensor cannot be trained, refer to appropriate diagnostic information.