DTC C2121-21-C2125-25, C2181-81-C2185-85; No Signal from Transmitter ID1 [12/2012 - ]: Description
The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the tire pressures. The measured values are transmitted to the tire pressure warning ECU and receiver in the vehicle as radio waves. The ECU compares the measured air pressure values with the air pressure threshold. When the measured air 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 a total of 20 minutes while the vehicle speed is more than 37 km/h (23 mph), or no transmitter ID is received from all the tire pressure warning valve and transmitters for a total of 20 minutes, these DTCs are stored.
DTCs from C2121/21 to C2124/24 (C2125/25: w/ Full Size Spare Tire) can only be cleared by using the Techstream. DTCs from C2181/81 to C2184/84 (C2185/85: w/ Full Size Spare Tire) can be cleared when the tire pressure warning valve and transmitter sends a forced transmission signal or test mode ends. DTCs from C2181/81 to C2184/84 (C2185/85: w/ Full Size Spare Tire) are output only in test mode.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C2121/21 | No Signal from Transmitter ID1 | Following condition (a) or (b) is met: (a) When all conditions below are met:
(b) When both conditions below are met:
|
|
| C2122/22 | No Signal from Transmitter ID2 | Following condition (a) or (b) is met: (a) When all conditions below are met:
(b) When both conditions below are met:
|
|
| C2123/23 | No Signal from Transmitter ID3 | Following condition (a) or (b) is met: (a) When all conditions below are met:
(b) When both conditions below are met:
|
|
| C2124/24 | No Signal from Transmitter ID4 | Following condition (a) or (b) is met: (a) When all conditions below are met:
(b) When both conditions below are met:
|
|
| C2125/25 | No Signal from Transmitter ID5 | Following condition (a) or (b) is met: (a) When all conditions below are met:
(b) When both conditions below are met:
|
|
| C2181/81 | Transmitter ID1 not Received (Test Mode DTC) | Test mode procedure is performed. |
|
| C2182/82 | Transmitter ID2 not Received (Test Mode DTC) | Test mode procedure is performed. |
|
| C2183/83 | Transmitter ID3 not Received (Test Mode DTC) | Test mode procedure is performed. |
|
| C2184/84 | Transmitter ID4 not Received (Test Mode DTC) | Test mode procedure is performed. |
|
| C2185/85 | Transmitter ID5 not Received (Test Mode DTC) | Test mode procedure is performed. |
|
- C2125/25: w/ Full Size Spare Tire
- C2185/85: w/ Full Size Spare Tire
When DTCs C2121/21 to C2124/24 (C2125/25: w/ Full Size Spare Tire) are stored, DTC C2179/79 may be stored simultaneously. In such cases, troubleshoot DTCs C2121/21 to C2124/24 (C2125/25: w/ Full Size Spare Tire) first, then troubleshoot DTC C2179/79.
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.