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 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): Description
The tire pressure warning valve and transmitter constantly sends radio waves to the tire pressure warning ECU.
Under the following conditions, the tire pressure warning antenna and receiver is unable to receive the signals from the tire pressure warning valve and transmitter, and a DTC is output.
- Areas, 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.
DTCs C2121/21 to C2124/24 can only be deleted by the tester. DTCs C2181/81 to C2184/84 can be deleted when the transmitter sends a forced transmission signal or the test mode ends. DTCs C2181/81 to C2184/84 are output only in the test mode.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C2121/21 C2122/22 C2123/23 C2124/24 |
These DTCs are detected when no signals are received for 51 minutes or more, after a vehicle speed of 5 mph (8 km/h) or more is detected and no signals are received for 12 minutes or more |
|
| C2181/81 C2182/82 C2183/83 C2184/84 |
Malfunction in transmission / reception circuit |
|
HINT:
When no signals are received for 60 minutes or more, a DTC is output.
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.