TIRE PRESSURE WARNING SYSTEM Tire Position Not Identified

DESCRIPTION

The tire pressure warning ECU and receiver identifies the tire position for each tire pressure warning valve and transmitter according to the wheel speed signals from the skid control ECU and acceleration rate signal from each acceleration sensor built into each tire pressure warning valve and transmitter, and sends this information to be stored in the main body ECU.

INSPECTION PROCEDURE

Note

It is necessary to perform initialization Click here after registration Click here of the transmitter IDs into the tire pressure warning ECU and receiver if one of the valve and transmitters has been replaced.

Tech Tips

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. IDENTIFY TIRE POSITION FOR EACH TIRE PRESSURE WARNING VALVE AND TRANSMITTER


    1. Set the tire pressure to the specified value Click here.

    2. Turn the ignition switch off.

    3. Connect the Techstream to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the Techstream on.

    6. Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

    7. Display the "ID Tire Inflation Pressure" value for each wheel using the Techstream.

      Tire Pressure Monitor
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      ID 1 Tire Inflation Pressure

      ID1 tire inflation pressure/

      min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (Gauge) / 0 kPa (0 kgf/cm2, 0 psi)

      max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/cm2, 55 psi)

      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID 2 Tire Inflation Pressure

      ID2 tire inflation pressure/

      min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (Gauge) / 0 kPa (0 kgf/cm2, 0 psi)

      max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/cm2, 55 psi)

      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID 3 Tire Inflation Pressure

      ID3 tire inflation pressure/

      min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (Gauge) / 0 kPa (0 kgf/cm2, 0 psi)

      max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/cm2, 55 psi)

      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID 4 Tire Inflation Pressure

      ID4 tire inflation pressure/

      min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (Gauge) / 0 kPa (0 kgf/cm2, 0 psi)

      max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/cm2, 55 psi)

      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*

      Tech Tips

      *: It may take a few minutes until the values are displayed.

    8. Rapidly reduce the tire pressure for each wheel at least 40 kPa (0.4 kgf/cm2, 5.8 psi) within 30 seconds.

      Note


      • It may take a few minutes until the values are displayed.

      • When an "ID Tire Inflation Pressure" value has not changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270 degrees. Then rapidly release the tire pressure and recheck the value.

    9. Read the "ID Tire Inflation Pressure" value and identify the tire with reduced pressure, and record the corresponding tire pressure warning valve and transmitter (ID1 to ID4).

    10. Repeat for each tire.

    11. Set the tire pressure to the specified value Click here.


    NEXT

  2. PERFORM INITIALIZATION


    1. Leave the vehicle with the ignition switch turned off for 15 minutes or more.

    2. Perform initialization to clear the existing tire position information Click here.


    OK

  3. IDENTIFY TIRE POSITION DURING DRIVING


    1. Turn the ignition switch off.

    2. Connect the Techstream to the DLC3.

    3. Drive the vehicle at 37 km/h (23 mph) or more for 10 minutes or more in 1 trip.

    4. Turn left or right at least 3 times within the trip.

    5. Turn the Techstream on.

    6. Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

    7. Without turning off the ignition switch, check the tire position for each transmitter.

      Tire Pressure Monitor
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      ID1 Tire Position ID1 Tire Position/No Information or FL or FR or RL or RR or Spare or Judging ID1 tire position is displayed If no tire position information is stored, "No Information" will be displayed.
      ID2 Tire Position ID2 Tire Position/No Information or FL or FR or RL or RR or Spare or Judging ID2 tire position is displayed If no tire position information is stored, "No Information" will be displayed.
      ID3 Tire Position ID3 Tire Position/No Information or FL or FR or RL or RR or Spare or Judging ID3 tire position is displayed If no tire position information is stored, "No Information" will be displayed.
      ID4 Tire Position ID4 Tire Position/No Information or FL or FR or RL or RR or Spare or Judging ID4 tire position is displayed If no tire position information is stored, "No Information" will be displayed.
      Result
      Result Proceed to
      A transmitter with its tire position as "Judging" exists. A
      No transmitter with its tire position as "Judging" exists, and no tire pressures are displayed on the multi-information display. B
      No transmitter with its tire position as "Judging" exists, and tire pressures are displayed on the multi-information display. C

    B

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    C

    END

    A

  4. CHECK TIRE PRESSURE WARNING VALVE AND TRANSMITTER


    1. Without turning off the ignition switch, check each transmitter with its tire position displayed as "Judging".

    2. Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

    3. Without turning off the ignition switch, check the number of times the transmitter signal and speed sensor signal have synchronized.

      Tire Pressure Monitor (Example: Transmitter ID1 installed to front wheel LH)
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      ID1 - FL Wheel Speed Synchronization Count ID1 - FL Wheel Speed Synchronization Count/min.: 0, max.: 255 Actual Synchronization Count -
      OK
      The transmitter signal and speed sensor signal have synchronized one or more times.

    NG

    REPLACE CORRESPONDING TIRE PRESSURE WARNING VALVE AND TRANSMITTER

    OK

  5. CHECK FREQUENCY RECEIVING CONDITION


    1. Check that the following conditions are not met:


      1. Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.

      2. Devices using similar radio frequencies are used in the vehicle.

        OK
        Facilities or devices that use similar radio frequencies are not located in the vicinity of the vehicle.

        Tech Tips

        Radio wave transmissions may be interrupted due to the surroundings or devices installed by the user.


    NG

    CHECK IF ANY DEVICE IS INSTALLED BY USER

    OK

    IDENTIFY TIRE POSITION DURING DRIVING AGAIN