Malfunctioning Wheel Unit Identification

NOTE:

The tire pressure monitoring system (TPMS) does not identify the location of the malfunctioning wheel unit on the vehicle (LF, RF, LR, RR). The TPMS identifies each wheel unit as No.1, No.2, No.3 and No.4. In order to identify the location of the wheel unit, perform the following procedure.

Adjust the air pressure as follows:
- FR: 220 kPa {2.2 kgf/cm² , 32 psi}
- FL: 240 kPa {2.4 kgf/cm² , 35 psi}
- RL: 260 kPa {2.6 kgf/cm² 38 psi}
- RR: 280 kPa {2.8 kgf/cm² , 40 psi}
Turn the ignition switch off.
Connect the WDS or equivalent to the DLC-2.
Turn the ignition switch to the ON position.
Drive the vehicle at a speed of 25 km/h {15.5 mph} or more for 2 min or more.
Select the following PIDs using the WDS or equivalent, and monitor them.
- WU1_P
- WU2_P
- WU3_P
- WU4_P
Determine which wheel unit identification code matches which wheel and tire by comparing the PID monitor values with the air pressure values set in Step 1.

Fig 1: Comparing PID Monitor Values With Air Pressure Values
Courtesy of MAZDA MOTORS CORP.
Select the ID_LAST PID using the WDS or equivalent, and take a note of four displayed identification codes.
Inspect the DTCs using the WDS or equivalent.