DTC C2121/21, C2122/22, C2123/23, C2124/24, C2125/25, C2181/81, C2182/82, C2183/83, C2184/84, C2185/85: No Signal From Transmitter ID1; No Signal From Transmitter ID2; No Signal From Transmitter ID3; No Signal From Transmitter ID4; No Signal From Transmitter ID5; Transmitter ID1 Not Received (Test Mode DTC); Transmitter ID2 Not Received (Test Mode DTC); Transmitter ID3 Not Received (Test Mode DTC); Transmitter ID4 Not Received (Test Mode DTC); 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 pressures. 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 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 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 may be unable to receive the signals from the tire pressure warning valve and transmitters, causing a DTC to be 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:

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 8 km/h (5 mph) or no transmitter ID is received from all the tire pressure warning valve and transmitters for a total of 20 minutes, DTCs will be set.

DTCs from C2121/21  to C2125/25  can be cleared by using the tester or when the tire pressure warning valve and transmitter sends a normal signal. 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 output only in test mode.

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.