Lexus ES: 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.
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the tire pressure warning valve and transmitter, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
-
It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver if one of the valve and transmitters has been replaced.
for Registration:
Click here
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for Initialization
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PROCEDURE
| 1. | TIRE PRESSURE WARNING VALVE AND TRANSMITTER |
(a) Set the tire pressure to the specified value.
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(b) Turn the power switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the power switch on (IG).
(e) Turn the Techstream on.
(f) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
(g) Display the "ID Tire Inflation Pressure" value for each wheel using the Techstream.
Chassis > Tire Pressure Monitor > Data List| 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.*1 |
| 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.*1 |
| 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.*1 |
| 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.*1 |
HINT:
*1: It may take a few minutes until the values are displayed.
Chassis > Tire Pressure Monitor > Data List| Tester Display |
|---|
| ID 1 Tire Inflation Pressure |
| ID 2 Tire Inflation Pressure |
| ID 3 Tire Inflation Pressure |
| ID 4 Tire Inflation Pressure |
(h) Rapidly reduce the tire pressure for each wheel at least 40 kPa (0.4 kgf/cm2, 5.8 psi) within 30 seconds.
NOTICE:
- 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.
(i) 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).
(j) Repeat for each tire.
(k) Set the tire pressure to the specified value.
Click here
|
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| 2. | PERFORM INITIALIZATION |
(a) Leave the vehicle with the power switch turned off for 15 minutes or more.
HINT:
After the vehicle has been stopped for 15 minutes or more, the tire pressure warning valve and transmitter will transmit radio wave signals more frequently for the first several minutes of driving.
(b) Perform initialization to clear the existing tire position information.
Click here
|
| 3. | IDENTIFY TIRE POSITION DURING DRIVING |
(a) Turn the power switch off.
(b) Connect the Techstream to the DLC3.
(c) Drive the vehicle at 40 km/h (25 mph) or more for 10 to 30 minutes in 1 trip.
HINT:
Do not drive the vehicle in reverse gear while performing Tire Position Identification. If the vehicle is driven in reverse gear while performing Tire Position Identification, identification information will be discarded and Tire Position Identification may take longer than usual.
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
(f) Without turning off the power switch, check the tire position for each transmitter.
Chassis > Tire Pressure Monitor > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| ID 1 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. |
| ID 2 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. |
| ID 3 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. |
| ID 4 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. |
| Tester Display |
|---|
| ID 1 Tire Position |
| ID 2 Tire Position |
| ID 3 Tire Position |
| ID 4 Tire Position |
| 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 | .gif) | GO TO TIRE PRESSURE WARNING LIGHT CIRCUIT INSPECTION PROCEDURE |
| C | | END |
|
| 4. | CHECK TIRE PRESSURE WARNING VALVE AND TRANSMITTER |
(a) Without turning off the power switch, check each transmitter with its tire position displayed as "Judging".
(b) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
(c) Without turning off the power switch, check the number of times the transmitter signal and speed sensor signal have synchronized.
Example: Transmitter ID1 installed to front wheel LH
Chassis > Tire Pressure Monitor > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| ID 1 - FL Wheel Speed Synchronization Count | ID1 - FL Wheel Speed Synchronization Count | min.: 0, max.: 255 | Actual Synchronization Count | - |
| Tester Display |
|---|
| ID 1 - FL Wheel Speed Synchronization Count |
| ID 1 - FR Wheel Speed Synchronization Count |
| ID 1 - RL Wheel Speed Synchronization Count |
| ID 1 - RR Wheel Speed Synchronization Count |
| ID 2 - FL Wheel Speed Synchronization Count |
| ID 2 - FR Wheel Speed Synchronization Count |
| ID 2 - RL Wheel Speed Synchronization Count |
| ID 2 - RR Wheel Speed Synchronization Count |
| ID 3 - FL Wheel Speed Synchronization Count |
| ID 3 - FR Wheel Speed Synchronization Count |
| ID 3 - RL Wheel Speed Synchronization Count |
| ID 3 - RR Wheel Speed Synchronization Count |
| ID 4 - FL Wheel Speed Synchronization Count |
| ID 4 - FR Wheel Speed Synchronization Count |
| ID 4 - RL Wheel Speed Synchronization Count |
| ID 4 - RR Wheel Speed Synchronization Count |
OK:
The transmitter signal and speed sensor signal have synchronized one or more times.
| NG | | REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER |
|
| 5. | CHECK FREQUENCY RECEIVING CONDITION |
(a) 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.
HINT:
Radio wave transmissions may be interrupted due to the surroundings or devices installed by the user.
| OK | | IDENTIFY TIRE POSITION DURING DRIVING AGAIN |
| NG | | CHECK IF ANY DEVICE IS INSTALLED BY USER |
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