DESCRIPTION The tire
pressure warning valve and transmitters that are installed in the tire
and wheel assemblies measure the tire pressure of each wheel. The
measured values are transmitted to the tire pressure warning ECU and
receiver in the vehicle as radio waves. 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 assembly illuminates. The tire pressure warning valve and transmitters constantly send radio waves to the tire pressure warning ECU and receiver.
Under
the conditions below, the tire pressure warning ECU 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 a tire pressure warning valve and transmitter is mistyped during registration.
- A tire, wheel and/or transmitter from a different vehicle is installed.
HINT: When no
transmitter ID is received from a tire pressure warning valve and
transmitter for 20 minutes or more while the vehicle speed is more than
40 km/h (25 mph), or no transmitter ID is received from all of the tire
pressure warning valve and transmitters for 20 minutes or more, DTCs
from C2121/21 to C2124/24 are stored. DTCs C2121/21
to C2124/24 can only be cleared by using the Techstream. DTCs C2181/81
to C2184/84 can be cleared when the tire pressure warning valve and
transmitter sends a forced transmission signal or test mode ends. DTCs
C2181/81 to C2184/84 are output only in test mode. |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Note | | C2121/21 |
No Signal from Transmitter ID1 |
Either of the following conditions (a) or (b) is met: (a) When all conditions below are met:
- Tire pressure warning valve and transmitter is not in stop mode.
- Any transmitter ID is not received from tire pressure warning valve and transmitters.
- Vehicle speed is more than 40 km/h (25 mph) or no vehicle speed signal is received for 20 minutes or more.
(b) When both conditions below are met:
- Tire pressure warning valve and transmitter is not in stop mode.
- No transmitter ID is received from tire pressure warning valve and transmitters for 20 minutes or more.
|
- Tire pressure warning valve and transmitter
- Tire pressure warning ECU and receiver
| - | |
C2122/22 | No Signal from Transmitter ID2 |
Either of the following conditions (a) or (b) is met: (a) When all conditions below are met:
- Tire pressure warning valve and transmitter is not in stop mode.
- Any transmitter ID is not received from tire pressure warning valve and transmitters.
- Vehicle speed is more than 40 km/h (25 mph) or no vehicle speed signal is received for 20 minutes or more.
(b) When both conditions below are met:
- Tire pressure warning valve and transmitter is not in stop mode.
- No transmitter ID is received from tire pressure warning valve and transmitters for 20 minutes or more.
|
- Tire pressure warning valve and transmitter
- Tire pressure warning ECU and receiver
| - | |
C2123/23 | No Signal from Transmitter ID3 |
Either of the following conditions (a) or (b) is met: (a) When all conditions below are met:
- Tire pressure warning valve and transmitter is not in stop mode.
- Any transmitter ID is not received from tire pressure warning valve and transmitters.
- Vehicle speed is more than 40 km/h (25 mph) or no vehicle speed signal is received for 20 minutes or more.
(b) When both conditions below are met:
- Tire pressure warning valve and transmitter is not in stop mode.
- No transmitter ID is received from tire pressure warning valve and transmitters for 20 minutes or more.
|
- Tire pressure warning valve and transmitter
- Tire pressure warning ECU and receiver
| - | |
C2124/24 | No Signal from Transmitter ID4 |
Either of the following conditions (a) or (b) is met: (a) When all conditions below are met:
- Tire pressure warning valve and transmitter is not in stop mode.
- Any transmitter ID is not received from tire pressure warning valve and transmitters.
- Vehicle speed is more than 40 km/h (25 mph) or no vehicle speed signal is received for 20 minutes or more.
(b) When both conditions below are met:
- Tire pressure warning valve and transmitter is not in stop mode.
- No transmitter ID is received from tire pressure warning valve and transmitters for 20 minutes or more.
|
- Tire pressure warning valve and transmitter
- Tire pressure warning ECU and receiver
| - | |
C2181/81 | Transmitter ID1 not Received (Test Mode DTC) |
Test mode procedure is performed. |
- Tire pressure warning valve and transmitter
- Tire pressure warning ECU and receiver
| - | |
C2182/82 | Transmitter ID2 not Received (Test Mode DTC) |
Test mode procedure is performed. |
- Tire pressure warning valve and transmitter
- Tire pressure warning ECU and receiver
| - | |
C2183/83 | Transmitter ID3 not Received (Test Mode DTC) |
Test mode procedure is performed. |
- Tire pressure warning valve and transmitter
- Tire pressure warning ECU and receiver
| - | |
C2184/84 | Transmitter ID4 not Received (Test Mode DTC) |
Test mode procedure is performed. |
- Tire pressure warning valve and transmitter
- Tire pressure warning ECU and receiver
| - |
NOTICE:
- When DTCs C2121/21 to C2124/24 are set, DTC C2179/79 may be set
simultaneously. In such cases, troubleshoot DTCs C2121/21 to C2124/24
first, then troubleshoot DTC C2179/79.
- If the Techstream is used to display the ECU Data List for 10 minutes or
more, DTCs C2121/21, C2122/22, C2123/23 and C2124/24 are stored to the
tire pressure warning ECU. If these DTCs are stored, clear the DTCs
using the Techstream.
- If any of the DTCs from C2121/21 to C2124/24 is output, clear the DTCs or drive at 40 km/h (25 mph) for 1 minute or more.
HINT: It is
necessary to perform the following procedure to identify the tire
pressure warning valve and transmitter that is malfunctioning because it
cannot be identified by the output DTC. WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
- When replacing the tire pressure warning ECU and receiver, read the
transmitter 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 and receiver
if the ECU and/or one of the valve and transmitters has been replaced.
PROCEDURE |
1. | 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.
HINT: If
the vehicle is located in an area such as the one described above, the
tire pressure warning light may illuminate after blinking 1 minute due
to interfering radio frequencies. (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 transmissions may be interrupted due to the surroundings or devices installed by the user.
| NG |
 | GO TO STEP 10 |
|
OK |
 | |
| 2. |
IDENTIFY TRANSMITTER CORRESPONDING TO DTC |
(a) Set the tire pressure to the specified value. Click here
(b) Turn the ignition switch to ON and let the vehicle idle for 2 to 3 minutes.
HINT: For
this vehicle, it may take longer than usual to receive data from the
tire pressure warning valve and transmitter while the Data List is
displayed. Therefore, before displaying the Data List, wait 2 to 3
minutes to receive data from the tire pressure warning valve and
transmitter. (c) Turn the ignition switch off. (d) Connect the Techstream to the DLC3.
(e) Turn the ignition switch to ON. (f) Turn the Techstream on.
(g) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
(h) Display the "ID Tire Inflation Pressure" value for each wheel using the Techstream.
(i)
Rapidly reduce the tire pressure for each wheel at least 40 kPa (0.4
kg/cm2, 5.8 psi) within 30 seconds. If the "ID Tire Inflation Pressure"
value displayed on the Techstream does not change, the tire pressure
warning valve and transmitter corresponding to the unchanged "ID Tire
Inflation Pressure" value was the cause of the output DTC.
HINT:
- Identify the malfunctioning tire pressure warning valve and transmitter
by repeatedly decreasing the tire pressure for each tire.
- Record which "ID Tire Inflation Pressure" value corresponds to each tire.
Chassis > Tire Pressure Monitor > Data List |
Tester Display | Measurement Item |
Measurement Item | 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.* |
HINT:
- *: It may take a few minutes until the values are displayed.
- The wheel position cannot be determined from ID1 through ID4 on the Data List.
(j) Check the Data List.
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.
(k) After confirming that the "ID
Tire Inflation Pressure" value for one tire has changed, repeat this
procedure for each tire. Identify the transmitter that corresponds to
the DTC. |
Result | Proceed to | |
One or more transmitter is abnormal |
A | | All transmitters are normal |
B |
| B |
| GO TO STEP 9 |
|
A | |
| |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3. (c) Turn the ignition switch to ON.
(d) 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. Chassis > Tire Pressure Monitor > Data List |
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note | |
Registered ID 1 Code | Registered ID1 code |
min.: 0 max.: FFFFFFF* |
ID No. registered for transmitter ID1 displayed |
- | | Registered ID 2 Code |
Registered ID2 code | min.: 0
max.: FFFFFFF* | ID No. registered for transmitter ID2 displayed |
- | | Registered ID 3 Code |
Registered ID3 code | min.: 0
max.: FFFFFFF* | ID No. registered for transmitter ID3 displayed |
- | | Registered ID 4 Code |
Registered ID4 code | min.: 0
max.: FFFFFFF* | ID No. registered for transmitter ID4 displayed |
- |
HINT:
- *: Displayed only when the ID No. is not registered.
- The wheel position cannot be determined from ID1 through ID4 on the Data List.
(g) Check the ID number on the identified transmitter by removing it from the tire and wheel.
|
*1 | Tire Pressure Warning Valve and Transmitter |
*a | Transmitter ID (7-digit Number) |
NOTICE: For
vehicles equipped with the wheel speed type tire inflation pressure
display function, be sure to use tire pressure warning valve and
transmitters with identification marks. (h) Confirm that the ID number on the transmitter and recorded transmitter ID match.
|
Result | Proceed to | |
Match | A | |
Do not match | B |
| B |
| GO TO STEP 5 |
|
A | |
| |
| 4. |
REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER |
(a) Replace the tire pressure warning valve and transmitter. Click here
|
NEXT | |
| |
| 5. |
REGISTRATION OF TRANSMITTER ID | (a) Perform registration.
Click here
|
NEXT | |
| |
| 6. |
PERFORM INITIALIZATION | (a) Perform initialization.
Click here
|
NEXT | |
| |
| 7. |
CONFIRM TIRE INFLATION PRESSURE (DATA LIST) |
(a) Turn the ignition switch off. (b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON. (d) 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. 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.* | |
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.* |
HINT:
- *: It may take a few minutes until the values are displayed.
For this vehicle, data reception from the tire pressure
warning valve and transmitter may worsen while displaying the Data List
and it may takes longer than usual to receive data.
If
data reception worsens while displaying the Data List, rapidly decrease
the tire pressure by 20 to 30 kPa (this increases the valve
transmission frequency).
- The wheel position cannot be determined from ID1 through ID4 on the Data List.
- 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.
|
Result | Proceed to | |
Tire pressure values are not displayed. |
A | | All tire pressure readings are equal to specified values. |
B |
| A |
| REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER |
|
B | |
| |
(a) Clear the DTCs. Click here
| NEXT | |
END | (a) Clear the DTCs.
Click here
| NEXT |
| END |
(a) Clear the DTCs. Click here
| NEXT | |
END | |
