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 to C2124 are stored. DTCs C2121 to C2124
can only be cleared by using the Techstream. DTCs C2181 to C2184 can be
cleared when the tire pressure warning valve and transmitter sends a
forced transmission signal or test mode ends. DTCs C2181 to C2184 are
output only in test mode. |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Note | | C2121 |
Transmitter ID 1 not Received (Main) |
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 | Transmitter ID 2 not Received (Main) |
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 | Transmitter ID 3 not Received (Main) |
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 | Transmitter ID 4 not Received (Main) |
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 | Transmitter ID 1 not Received (for Test Diagnosis) |
Test mode procedure is performed. |
- Tire pressure warning valve and transmitter
- Tire pressure warning ECU and receiver
| - | |
C2182 | Transmitter ID 2 not Received (for Test Diagnosis) |
Test mode procedure is performed. |
- Tire pressure warning valve and transmitter
- Tire pressure warning ECU and receiver
| - | |
C2183 | Transmitter ID 3 not Received (for Test Diagnosis) |
Test mode procedure is performed. |
- Tire pressure warning valve and transmitter
- Tire pressure warning ECU and receiver
| - | |
C2184 | Transmitter ID 4 not Received (for Test Diagnosis) |
Test mode procedure is performed. |
- Tire pressure warning valve and transmitter
- Tire pressure warning ECU and receiver
| - |
NOTICE:
- When DTCs C2121 to C2124 are stored, DTC C2179 may be stored
simultaneously. In such cases, troubleshoot DTCs C2121 to C2124 first,
then troubleshoot DTC C2179.
- If the Techstream is used to display the Data List for 10 minutes or
more, the tire pressure warning ECU stores DTCs C2121, C2122, C2123 and
C2124. If these DTCs are stored, clear the DTCs using the Techstream.
- If any DTC from C2121 to C2124 is output, clear the DTCs or drive the
vehicle at 40 km/h (25 mph) for 1 minute or more after repairing the
malfunctions.
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 or 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 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 for 1 minute
due to interfering radio frequencies. (2) Devices using similar radio frequencies are used in the vehicle.
HINT: Radio transmissions may be interrupted due to the surroundings or devices installed by the user.
|
Result | Proceed to | |
There
is no device or facility that uses electrical waves of approximately
the same frequency in the vicinity of the vehicle or inside the vehicle. |
A | | There
is a device or facility that uses electrical waves of approximately the
same frequency in the vicinity of the vehicle or inside the vehicle. |
B |
| B |
 | GO TO STEP 10 |
|
A |
 | |
(a) Check the stored DTC.
|
Result | Proceed to | |
Any DTCs from C2121 to C2124 are output (C2181 to C2184 when in Test Mode) |
A | | All DTCs from C2121 to C2124 are output (C2181 to C2184 when in Test Mode) |
B |
| B |
| GO TO STEP 5 |
|
A | |
| |
| 3. |
IDENTIFY TRANSMITTER CORRESPONDING TO DTC (TIRE POSITION) |
(a) Turn the power switch off. (b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG). (d) Turn the Techstream on. (e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
(f) Display the "ID Tire Position" value for each wheel using the Techstream.
(g) Refer to the following chart and check the wheel position of the DTC and transmitter match. 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. |
HINT: Refer to the following chart for the Data List items that correspond to the DTCs. |
DTC No. | Detection Item |
Data List | | C2121 |
Transmitter ID 1 not Received (Main) |
ID1 Tire Position | |
C2181 | Transmitter ID 1 not Received (for Test Diagnosis) | |
C2122 | Transmitter ID 2 not Received (Main) |
ID2 Tire Position | |
C2182 | Transmitter ID 2 not Received (for Test Diagnosis) | |
C2123 | Transmitter ID 3 not Received (Main) |
ID3 Tire Position | |
C2183 | Transmitter ID 3 not Received (for Test Diagnosis) | |
C2124 | Transmitter ID 4 not Received (Main) |
ID4 Tire Position | |
C2184 | Transmitter ID 4 not Received (for Test Diagnosis) | Chassis > Tire Pressure Monitor > Data List
|
Tester Display | | ID 1 Tire Position | |
ID 2 Tire Position | |
ID 3 Tire Position | |
ID 4 Tire Position |
|
NEXT | |
| |
(a) Turn the power switch off.
(b) Connect the Techstream to the DLC3. (c) Turn the power switch on (IG).
(d) Turn the Techstream on. (e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
(f) Refer to the following chart and record the tire pressure warning valve and transmitter ID of the output DTC. 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*1 |
ID No. registered for transmitter ID1 displayed |
- | | Registered ID 2 Code |
Registered ID2 code | min.: 0
max.: FFFFFFF*1 | ID No. registered for transmitter ID2 displayed |
- | | Registered ID 3 Code |
Registered ID3 code | min.: 0
max.: FFFFFFF*1 | ID No. registered for transmitter ID3 displayed |
- | | Registered ID 4 Code |
Registered ID4 code | min.: 0
max.: FFFFFFF*1 | ID No. registered for transmitter ID4 displayed |
- |
HINT:
- *1: Displayed only when the ID No. is not registered.
- Refer to the following chart for the Data List items that correspond to the DTCs.
|
DTC No. |
Detection Item |
Data List |
|
C2121 |
Transmitter ID 1 not Received (Main) |
Registered ID 1 code |
|
C2181 |
Transmitter ID 1 not Received (for Test Diagnosis) |
|
C2122 |
Transmitter ID 2 not Received (Main) |
Registered ID 2 code |
|
C2182 |
Transmitter ID 2 not Received (for Test Diagnosis) |
|
C2123 |
Transmitter ID 3 not Received (Main) |
Registered ID 3 code |
|
C2183 |
Transmitter ID 3 not Received (for Test Diagnosis) |
|
C2124 |
Transmitter ID 4 not Received (Main) |
Registered ID 4 code |
|
C2184 |
Transmitter ID 4 not Received (for Test Diagnosis) |
Chassis > Tire Pressure Monitor > Data List
|
Tester Display | | Registered ID 1 Code | |
Registered ID 2 Code | |
Registered ID 3 Code | |
Registered ID 4 Code | (g) Disassemble the tire indicated in the output DTC and check the tire pressure warning valve and transmitter ID.
|
*1 | Tire Pressure Warning Valve and Transmitter |
- | - | |
*a | Transmitter ID (7-digit Number) |
*b | Wheel Speed Type Tire Inflation Pressure Display Function Identification Mark |
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 |
| A |
| REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER |
| B |
| GO TO STEP 7 |
| 5. |
TEST MODE INSPECTION (C2181 to C2184) |
(a) Perform a test mode inspection and perform Transmitter Data Reception Check (C2181 to C2184).
Click here
| OK |
| END |
|
NG | |
| |
| 6. |
CHECK TIRE PRESSURE WARNING VALVE AND TRANSMITTER |
(a) Turn the power switch off. (b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG). (d) Turn the Techstream on. (e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
(f) Refer to the following chart and record all of the tire pressure warning valve and transmitter IDs. 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*1 |
ID No. registered for transmitter ID1 displayed |
- | | Registered ID 2 Code |
Registered ID2 code | min.: 0
max.: FFFFFFF*1 | ID No. registered for transmitter ID2 displayed |
- | | Registered ID 3 Code |
Registered ID3 code | min.: 0
max.: FFFFFFF*1 | ID No. registered for transmitter ID3 displayed |
- | | Registered ID 4 Code |
Registered ID4 code | min.: 0
max.: FFFFFFF*1 | ID No. registered for transmitter ID4 displayed |
- |
HINT:
- *1: Displayed only when the ID No. is not registered.
- The wheel position cannot be determined from ID1 through ID4 on the Data List.
Chassis > Tire Pressure Monitor > Data List
|
Tester Display | | Registered ID 1 Code | |
Registered ID 2 Code | |
Registered ID 3 Code | |
Registered ID 4 Code | (g) Disassemble all of the tires and check the tire pressure warning valve and transmitter IDs.
|
*1 | Tire Pressure Warning Valve and Transmitter |
- | - | |
*a | Transmitter ID (7-digit Number) |
*b | Wheel Speed Type Tire Inflation Pressure Display Function Identification Mark |
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 |
| A |
| REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER |
|
B | |
| |
| 7. |
REGISTRATION OF TRANSMITTER ID | (a) Perform registration.
Click here
|
NEXT | |
| |
| 8. |
PERFORM INITIALIZATION | (a) Perform initialization.
Click here
|
NEXT | |
| |
(a) Clear the DTCs. Chassis > Tire Pressure Monitor > Clear DTCs
| NEXT |
| END |
(a) Clear the DTCs. Chassis > Tire Pressure Monitor > Clear DTCs
| NEXT |
| END | | 
