May 13, 2010
Navigating the Matrix
TPMS re-set involves special Toyota tool
By: Information provided by Mitchell 1
Figure 1
SUBJECT VEHICLE: 2008-09 Toyota Matrix.
SENSOR IN TIRE? Yes.
RESET PROCEDURE? Yes (whenever a sensor or the tire pressure ECU has been replaced).
SPECIAL TOOLS NEEDED? Yes (Techstream tester).
The 2009 Toyota Matrix’s tire pressure monitoring system (TPMS) contains sensors that are installed in each tire and wheel assembly. The sensors send air pressure data to the tire pressure sensor antenna and receiver assembly. This data is then sent to the tire pressure monitor electronic control unit (ECU), which compares the measured air pressure with the specified pressure.
If the recorded value is less than the specified value, the tire pressure warning light on the instrument panel will turn on.
In with the new
Before you can replace an old sensor, you have to demount the tire and wheel assembly. Note that installed tires must be of the specified size in order for the TPMS to function properly. Follow these steps to remove the old sensor:
1. Remove the wheel. Then remove the valve core and cap and release the air from the tire. Keep the core and cap.
2. Remove the nut and washer that are used to hold the tire pressure monitor valve sub-assembly. Drop the sensor inside the tire.
3. Disengage and remove the bead on the upper side. Check that no cracks are visible on the grommet.
4. Take the sensor out of the tire.
5. Remove the bead on the lower side.
6. Dispose of the sensor by removing its back cover with a flathead screwdriver and cutting the two battery terminals.
Now you’re ready to install the new sensor. Here’s how:
1. Insert the tire pressure monitor valve into the valve installation hole. Insert from inside the rim so that the print surface can be seen.
2. Check that there is no visible deformation or damage on the transmitter.
3. Check that there is no foreign matter on the inner grommet and around the rim hole.
4. Write down the new sensor’s ID number. It is necessary to register the ID in the ECU after installation.
5. Install the washer on the monitor valve from the rim side. Tighten the nut to 35 in.-lbs. (see Figure 1).
6. Check to make sure there is no oil, water or lubricant around the rim hole, monitor valve, washer and nut. Failing to do so may result in improper installation.
7. Inflate the tire. If the valve nut loosens, retighten it to the specified torque. Check for air leaks.
8. Put the wheel on the mounting machine. Install the lower tire bead. Make sure the bead and tool do not interfere with the main body of the sensor and that the sensor is not clamped by the bead.
9. Install the upper bead.
10. Install the tire and wheel assembly.
At this point, you’re ready for the next step: sensor registration.
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