Register Mazda sensors when changing tires or wheels
SUBJECT VEHICLE: 2007-12 Mazda CX-7 and CX-9.
RELEARN PROCEDURE? Yes.
SPECIAL TOOLS NEEDED? No.
The tire pressure monitoring system (TPMS) on the 2007-12 Mazda CX-7 and CX-9 monitors the pressure for each tire. If tire pressure is too low or too high in one or more tires, the TPMS will turn on a warning light on the instrument panel and sound a warning beep for about three seconds.
If there is a system malfunction or a spare tire is in use, the warning light will flash. Tire pressure sensors installed on each wheel send tire pressure data by radio signal to the receiver unit in the vehicle.
NOTE: Whenever tires or wheels are changed (such as changing to and from winter tires) where a new sensor is installed, the tire pressure sensor’s unique ID signal code must be registered with the TPMS. See Reset procedures.
NOTE: The TPMS is not affected by wheel and tire rotation.
The TPMS may not function properly under the following conditions:
• When there is equipment or a device near the vehicle using the same radio frequency as that of the tire pressure sensors.
• When a large metallic object (i.e., a large electric household appliance or a desktop computer) is placed on the right side of the rear seat, it may block radio signals from the tire pressure sensor to the receiver unit.
• When using a digital device (such as a personal computer) or a current converter device that may cause radio interference with the receiver unit.
• When excess snow or ice adheres to the vehicle, especially around the wheels.
• When the tire pressure sensor batteries are exhausted.
• When using a wheel with no tire pressure sensor installed (i.e., spare tire).
• When using tires with steel wire reinforcement in the sidewalls.
• When using tire chains.
Tire pressure monitor warning indicators
CAUTION: Do not tilt or use excessive side force when checking air pressure or inflating a tire or the tire pressure sensor may be damaged. NOTE: Perform tire pressure adjustments when the tires are cold.
Tire pressure will vary according to the tire temperature (approximately 1.5 psi [10 kPa] change for every 10 degrees). Let the vehicle stand for one hour or only drive it 1.6 km (one mile) or less before adjusting the tire pressures.
When the tire pressure warning light illuminates and the warning beep sound is heard (about three seconds), check tire pressure and adjust as necessary. When pressure is adjusted on hot tires to the cold inflation pressure, the warning light/beep may turn on after the tires cool and pressure drops below specification.
Also, an illuminated warning light resulting from the tire air pressure dropping due to cold ambient temperature may go out if the ambient temperature rises. In this case, it will also be necessary to adjust the tire air pressure. If the warning light illuminates again even after the tire pressures are adjusted, the tire may be punctured.
NOTE: After adjusting the tire air pressures, it may require some time for the warning light to go out. If the warning light remains illuminated, drive the vehicle at a speed of at least 16 mph (25 km/h) for 10 minutes, and then verify that it goes out.
If the warning light is flashing and a spare tire is not in use, there is a malfunction in the TPMS. See appropriate manufacturer service information.
NOTE: Tire pressure sensor ID registration is achieved automatically once the vehicle has been stationary for 15 minutes or more, and then driving at a speed of at least 16 mph (25 km/h) for 10 minutes or more.
When the tire pressure warning light illuminates and the warning beep sound is heard, check tire pressure and adjust as necessary. After adjusting the tire air pressures, it may require some time for the warning light to go out.
If the warning light remains illuminated, drive the vehicle at a speed of at least 16 mph (25 km/h) for 10 minutes, and then verify that it goes out.
Tire pressure sensor registration
NOTE: There is no practical difference between the M-MDS scan tool method of registration and the non-scan tool method. The M-MDS scan tool method simply provides the ability to read the tire pressure sensor ID changes directly. With both methods, the vehicle must remain stationary for 15 minutes and then be driven for 10 minutes.
Without M-MDS scan tool
1. Turn the ignition switch to the ON position, then turn it back to the LOCK position.
2. Leave the vehicle with the engine off, and wait for 15 minutes or more. NOTE: If the vehicle is driven before 15 minutes of changing tires, the TPMS warning light will flash because the sensor ID signal code will not have been registered yet. If this happens, park the vehicle for 15 minutes or more, after which sensor ID signal code will register upon driving vehicle for 10 minutes or more.
3. After 15 minutes, drive the vehicle at a speed of at least 16 mph (25 km/h) for 10 minutes or more. Tire pressure sensor ID registration is completed when the TPMS warning light turns OFF.
With M-MDS scan tool
NOTE: Use the LDS (laptop PC). The PDS (pocket PC) does not support wheel unit ID registration and monitoring wheel unit ID. NOTE: When using the M-MDS scan tool to perform the ID registration, record the initial ID data and verify the data has changed after driving for 10 minutes or more.
1. Turn the ignition switch to the ON position, then turn it back to the LOCK position.
2. Connect M-MDS scan tool and identify the vehicle.
3. After the vehicle is identified, select the following items from the initial screen of the M-MDS.
4. Select “BODY,” then “TPMS FUNCTION” then “WHEEL UNIT ID REGISTRATION.” NOTE: Before driving, record the initial ID data in the scan tool, to verify the data has changed.
5. Select “WU_ID REGISTRATION.”
6. Leave the vehicle with the engine off, and wait for 15 minutes or more.
7. Verify the TPMS warning light turns ON and OFF in one-half second repeat cycles.
8. After 15 minutes or more, drive the vehicle at a speed of at least 16 mph (25 km/h) for 10 minutes or more. Tire pressure sensor ID registration is complete when the TPMS warning light turns OFF.
CAUTION: The tire should be demounted from the wheel using the tire changer manufacturer’s instructions. Use the following information to avoid damage during the demounting/mounting procedures.
Tire pressure sensor
CAUTION: The use of non-genuine tire sealants is strictly prohibited for vehicles equipped with TPMS. Other tire sealants can clog the tire pressure sensors. CAUTION: When reinstalling a previously removed tire pressure sensor to a wheel, replace the grommet for the tire pressure sensor.
NOTE: Factory wheels are specially designed for installation of tire pressure sensors. DO NOT use non-genuine wheels, or it may not be possible to install tire pressure sensors.
1. When replacing a wheel or tire, the tire pressure sensors must be set up in one of the following ways:
• Remove the sensor from the old wheel and install it to the new wheel. Keep the same wheel with tire pressure sensor, and replace only the tire.
• Use a new wheel and sensor (the new sensor will need to be registered).
2. Remove the wheel. Remove the valve cap. See Figure 1. Remove the valve core, and bleed air from the tire. CAUTION: Breaking the tire bead with the tire pressure sensor installed normally could damage the sensor. Be sure to always push the sensor so that it is completely inside the tire to prevent any damage.
3. Remove the nut. Push the tire valve completely into the tire.
4. Position the shoe (bead breaker) of the tire changer 0.40-0.78 inch (10-20 mm) from the outer edge of the wheel, and break both tire beads.
5. Remove the bead from one side of the wheel.
6. Remove the tire pressure sensor.
7. Remove the seal washer and seal.
1. Install the seal washer and seal. NOTE: While maintaining steady contact between the sensor and the rim, manually start to screw the valve nut for several turns.
2. Insert the tire pressure sensor valve into the valve hole so that the polyurethane foam side faces the rim. See Figure 2.
CAUTION: Do not retighten the valve nut after the initial operation.
3. Install the nut from the outer side of the wheel.
4. Tighten the valve nut slowly (15 RPM max.) to 71 in.-lbs. (8 N.m) in one rotation. CAUTION: Do not position the tire changer near the tire valve, or the tire pressure sensor may be damaged.
5. Set the tire changer so that it is 45 degrees away (point “A”) from the valve hole. See Figure 3. CAUTION: Do not tilt or use excessive side force when checking air pressure or inflating the tire or the tire pressure sensor may be damaged.
6. Fill the tire with air. Verify the valve nut tightening torque.
7. Install the valve core and cap.
8. Install the tire and wheel assembly.
9. When a new sensor is installed, the ID code will need to be registered. See Reset procedures. ■
Information for this column comes from Mitchell 1’s “Tire Pressure Monitoring Systems Guide” for domestic and import vehicles through 2012. Headquartered in Poway, Calif., Mitchell 1 has provided quality repair information solutions to the automotive industry for more than 80 years. For more information, visit www.mitchell1.com.
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