- The tire pressure warning valve and transmitter is not in stop mode.
- Signals are continuously not received from the tire pressure warning valve and transmitters for 20 minutes or more while communication between the tire pressure warning ECU and ECUs of other systems is functioning normally and the vehicle is driven at speed of 8 km/h (5 mph) or more.
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Suspension | Section: Tire Pressure Monitoring | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000000ZUQ02YX |
| Title: TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
C2121/21 |
No Signal from Transmitter ID1 in Main Mode |
|
DTC |
C2122/22 |
No Signal from Transmitter ID2 in Main Mode |
|
DTC |
C2123/23 |
No Signal from Transmitter ID3 in Main Mode |
|
DTC |
C2124/24 |
No Signal from Transmitter ID4 in Main Mode |
|
DTC |
C2125/25 |
No Signal from Transmitter ID5 in Main Mode |
|
DTC |
C2181/81 |
Transmitter ID1 not Received (Test Mode DTC) |
|
DTC |
C2182/82 |
Transmitter ID2 not Received (Test Mode DTC) |
|
DTC |
C2183/83 |
Transmitter ID3 not Received (Test Mode DTC) |
|
DTC |
C2184/84 |
Transmitter ID4 not Received (Test Mode DTC) |
|
DTC |
C2185/85 |
Transmitter ID5 not Received (Test Mode DTC) |
DESCRIPTION
The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the tire pressure of the tires. The measured values are transmitted to the tire pressure warning antenna and receiver on the body as radio waves and then sent to the tire pressure warning ECU. The ECU compares the measured tire pressure values with the tire pressure threshold. When the measured tire pressure value is less than this threshold, the warning light in the combination meter turns on.
The tire pressure warning valve and transmitters constantly send radio waves to the tire pressure warning antenna and receiver.
Under the conditions below, the tire pressure warning antenna and receiver is unable to receive the signals from the tire pressure warning valve and transmitters, and a DTC is stored.
- Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.
- Devices using similar radio frequencies are used in the vehicle.
- The ID of the tire pressure warning valve and transmitter is mistyped during registration.
- A tire/wheel/transmitter from a different vehicle is installed.
HINT:
These DTCs are stored when no signals are received for 20 minutes or more, after a vehicle speed of 8 km/h (5 mph) or more is output and no signals are still received for 20 minutes or more.
DTCs from C2121/21 to C2125/25 can only be cleared by using the Techstream. DTCs from C2181/81 to C2185/85 can be cleared when the transmitter in the tire pressure warning valve and transmitter sends a forced transmission signal or test mode ends. DTCs from C2181/81 to C2185/85 are stored only in test mode.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C2121/21 C2122/22 C2123/23 C2124/24 C2125/25 |
Condition (a) or (b) is met: (a) When all conditions below are met: (b) When all conditions below are met:
|
|
|
C2181/81 C2182/82 C2183/83 C2184/84 C2185/85 |
The test mode procedure is performed. |
|
HINT:
It is necessary to perform the procedure to identify the tire pressure warning valve and transmitter that is malfunctioning because it cannot be identified by the output DTC.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
- When replacing the tire pressure warning ECU, read the IDs 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 after the ECU and/or the tire pressure warning valve and transmitter has been replaced.
PROCEDURE
|
1. |
CHECK DTC OUTPUT (C2179/79) |
(a) Turn the engine switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG) and turn the Techstream on.
(d) Enter the following menus: Chassis / Tire Pressure Monitor / Trouble Codes.
(e) Read DTCs.
Result
Result |
Proceed to |
|---|---|
|
DTC C2179/79 is not output |
A |
|
DTC C2179/79 is output |
B |
|
|
2. |
CHECK FREQUENCY RECEIVING CONDITION |
(a) Check for the following conditions described below:
(1) Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.
HINT:
If the vehicle is located in areas described above, the tire pressure warning light may turn on only in a particular area.
(2) Devices using similar radio frequencies are used in the vehicle.
OK:
Facilities or devices that use similar radio frequencies are not located in or around the vehicle.
HINT:
Radio frequencies may be interrupted due to the surroundings, or devices installed by the user.
|
|
3. |
IDENTIFY TRANSMITTER CORRESPONDING TO DTC |
(a) Set the tire pressure of all tires to the specified value(s)
.
(b) Turn the engine switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the engine switch on (IG) and turn the Techstream on.
(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
(f) Check the values by referring to the table below.
Tire Pressure Monitor
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
ID1 Tire Inflation Pressure |
ID1 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (gauge) / -100 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2, 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2, 78 psi) |
Actual tire inflation pressure |
If 0 kPa (0 kgf/cm2, 0 psi) is displayed for the absolute pressure (abs) or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for the relative pressure (gauge), the data has not been received.* |
|
ID2 Tire Inflation Pressure |
ID2 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (gauge) / -100 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2, 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2, 78 psi) |
Actual tire inflation pressure |
If 0 kPa (0 kgf/cm2, 0 psi) is displayed for the absolute pressure (abs) or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for the relative pressure (gauge), the data has not been received.* |
|
ID3 Tire Inflation Pressure |
ID3 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (gauge) / -100 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2, 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2, 78 psi) |
Actual tire inflation pressure |
If 0 kPa (0 kgf/cm2, 0 psi) is displayed for the absolute pressure (abs) or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for the relative pressure (gauge), the data has not been received.* |
|
ID4 Tire Inflation Pressure |
ID4 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (gauge) / -100 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2, 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2, 78 psi) |
Actual tire inflation pressure |
If 0 kPa (0 kgf/cm2, 0 psi) is displayed for the absolute pressure (abs) or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for the relative pressure (gauge), the data has not been received.* |
|
ID5 Tire Inflation Pressure |
ID5 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (gauge) / -100 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2, 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2, 78 psi) |
Actual tire inflation pressure |
If 0 kPa (0 kgf/cm2, 0 psi) is displayed for the absolute pressure (abs) or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for the relative pressure (gauge), the data has not been received.* |
HINT:
- *: It may take about 2 or 3 minutes until the values are displayed.
- The tire pressure information reception condition can also be confirmed through the multi-information display tire pressure display screen.
(g) Rapidly reduce the tire pressure for each tire at least 40 kPa (0.4 kgf/cm2, 5.8 psi) within 30 seconds.
(h) Check the Data List.
NOTICE:
- It takes about 2 or 3 minutes to display the updated tire pressure data.
- When no "ID Tire Inflation Pressure" data has changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270°. Then rapidly release the tire pressure and recheck it.
- Record the "ID Tire Inflation Pressure" data transmitter ID that corresponds to each tire.
(i) After confirming that the "ID Tire Inflation Pressure" data for one tire (ID1 to ID5) has changed, repeat this procedure for each tire. Identify the transmitter that corresponds to the DTC.
Result
|
Condition |
Proceed to |
|---|---|
|
All abnormal |
A |
|
One or more transmitters abnormal |
B |
|
All normal |
C |
|
|
4. |
CHECK HARNESS AND CONNECTOR (ECU - RECEIVER) |
|
(a) Disconnect the L10 ECU connector. |
(b) Disconnect the K8 receiver connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
L10-9 (RDA) - K8-1 (RDA) |
Always |
Below 1 Ω |
|
L10-4 (GND2) - K8-4 (GND) |
Always |
Below 1 Ω |
|
L10-10 (RF5V) - K8-5 (+5V) |
Always |
Below 1 Ω |
|
L10-9 (RDA) or K8-1 (RDA) - Body ground |
Always |
10 kΩ or higher |
|
L10-4 (GND2) or K8-4 (GND) - Body ground |
Always |
10 kΩ or higher |
|
L10-10 (RF5V) or K8-5 (+5V) - Body ground |
Always |
10 kΩ or higher |
|
|
5. |
INSPECT TIRE PRESSURE WARNING ECU |
(a) Turn the engine switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG) and turn the Techstream on.
(d) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
(e) Check the values by referring to the table below.
Tire Pressure Monitor
|
Tester Display |
Measurement Item/Display |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Registered ID1 Code |
Registered ID1 code/ min.: 0 max.: FFFFFFF* |
ID No. registered in transmitter ID1 displayed |
*: Displayed only when the ID No. is not registered. |
|
Registered ID2 Code |
Registered ID2 code/ min.: 0 max.: FFFFFFF* |
ID No. registered in transmitter ID2 displayed |
*: Displayed only when the ID No. is not registered. |
|
Registered ID3 Code |
Registered ID3 code/ min.: 0 max.: FFFFFFF* |
ID No. registered in transmitter ID3 displayed |
*: Displayed only when the ID No. is not registered. |
|
Registered ID4 Code |
Registered ID4 code/ min.: 0 max.: FFFFFFF* |
ID No. registered in transmitter ID4 displayed |
*: Displayed only when the ID No. is not registered. |
|
Registered ID5 Code |
Registered ID5 code/ min.: 0 max.: FFFFFFF* |
ID No. registered in transmitter ID5 displayed |
*: Displayed only when the ID No. is not registered. |
(f) Check the ID number on the identified transmitter by removing it from the tire and wheel.
(g) Confirm that the ID number on the transmitter and recorded transmitter ID match.
Result
|
Result |
Proceed to |
|---|---|
|
Match |
A |
|
Do not match |
B |
|
|
6. |
REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER |
(a) Replace the tire pressure warning valve and transmitter
.
|
|
7. |
PERFORM REGISTRATION OF TRANSMITTER ID |
(a) Perform registration
.
|
|
8. |
PERFORM INITIALIZATION |
(a) Perform initialization
.
|
|
9. |
CONFIRM TIRE INFLATION PRESSURE (DATA LIST) |
(a) Turn the engine switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG) and turn the Techstream on.
(d) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
(e) Check the values by referring to the table below.
Tire Pressure Monitor
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
ID1 Tire Inflation Pressure |
ID1 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (gauge) / -100 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2, 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2, 78 psi) |
Actual tire inflation pressure |
If 0 kPa (0 kgf/cm2, 0 psi) is displayed for the absolute pressure (abs) or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for the relative pressure (gauge), the data has not been received.* |
|
ID2 Tire Inflation Pressure |
ID2 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (gauge) / -100 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2, 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2, 78 psi) |
Actual tire inflation pressure |
If 0 kPa (0 kgf/cm2, 0 psi) is displayed for the absolute pressure (abs) or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for the relative pressure (gauge), the data has not been received.* |
|
ID3 Tire Inflation Pressure |
ID3 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (gauge) / -100 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2, 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2, 78 psi) |
Actual tire inflation pressure |
If 0 kPa (0 kgf/cm2, 0 psi) is displayed for the absolute pressure (abs) or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for the relative pressure (gauge), the data has not been received.* |
|
ID4 Tire Inflation Pressure |
ID4 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (gauge) / -100 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2, 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2, 78 psi) |
Actual tire inflation pressure |
If 0 kPa (0 kgf/cm2, 0 psi) is displayed for the absolute pressure (abs) or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for the relative pressure (gauge), the data has not been received.* |
|
ID5 Tire Inflation Pressure |
ID5 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (gauge) / -100 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2, 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2, 78 psi) |
Actual tire inflation pressure |
If 0 kPa (0 kgf/cm2, 0 psi) is displayed for the absolute pressure (abs) or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for the relative pressure (gauge), the data has not been received.* |
HINT:
- *: It may take about 2 or 3 minutes until the values are displayed.
- The tire pressure information reception condition can also be confirmed through the multi-information display tire pressure display screen.
- When no "ID Tire Inflation Pressure" data has changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270°. Then rapidly release the tire pressure and recheck it.
Result
|
Result |
Proceed to |
|---|---|
|
Tire pressure values are not displayed. |
A |
|
All tire pressure readings are equal to specified values. |
B |
|
|
10. |
REPLACE TIRE PRESSURE WARNING ANTENNA AND RECEIVER |
(a) Replace the tire pressure warning antenna and receiver
.
|
|
11. |
CONFIRM TIRE INFLATION PRESSURE (DATA LIST) |
(a) Turn the engine switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG) and turn the Techstream on.
(d) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
(e) Check the values by referring to the table below.
Tire Pressure Monitor
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
ID1 Tire Inflation Pressure |
ID1 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (gauge) / -100 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2, 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2, 78 psi) |
Actual tire inflation pressure |
If 0 kPa (0 kgf/cm2, 0 psi) is displayed for the absolute pressure (abs) or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for the relative pressure (gauge), the data has not been received.* |
|
ID2 Tire Inflation Pressure |
ID2 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (gauge) / -100 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2, 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2, 78 psi) |
Actual tire inflation pressure |
If 0 kPa (0 kgf/cm2, 0 psi) is displayed for the absolute pressure (abs) or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for the relative pressure (gauge), the data has not been received.* |
|
ID3 Tire Inflation Pressure |
ID3 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (gauge) / -100 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2, 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2, 78 psi) |
Actual tire inflation pressure |
If 0 kPa (0 kgf/cm2, 0 psi) is displayed for the absolute pressure (abs) or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for the relative pressure (gauge), the data has not been received.* |
|
ID4 Tire Inflation Pressure |
ID4 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (gauge) / -100 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2, 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2, 78 psi) |
Actual tire inflation pressure |
If 0 kPa (0 kgf/cm2, 0 psi) is displayed for the absolute pressure (abs) or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for the relative pressure (gauge), the data has not been received.* |
|
ID5 Tire Inflation Pressure |
ID5 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (gauge) / -100 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure (abs) / 637.5 kPa (6.5 kgf/cm2, 92.5 psi), Relative pressure (gauge) / 537.5 kPa (5.4 kgf/cm2, 78 psi) |
Actual tire inflation pressure |
If 0 kPa (0 kgf/cm2, 0 psi) is displayed for the absolute pressure (abs) or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for the relative pressure (gauge), the data has not been received.* |
HINT:
- *: It may take about 2 or 3 minutes until the values are displayed.
- The tire pressure information reception condition can also be confirmed through the multi-information display tire pressure display screen.
- When no "ID Tire Inflation Pressure" data has changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270°. Then rapidly release the tire pressure and recheck it.
Result
|
Result |
Proceed to |
|---|---|
|
Tire pressure values are not displayed. |
A |
|
All tire pressure readings are equal to specified values. |
B |
|
|
|