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 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*1 (10 minutes*2) or more while the vehicle speed is more than 37 km/h (23 mph), or no transmitter ID is received from all of the tire pressure warning valve and transmitters for 20 minutes*1 (10 minutes*2) or more, these DTCs are set.

DTCs C2121/21 to C2124/24 (w/ Full Size Spare Tire: C2125/25) can only be cleared by using the Techstream. DTCs C2181/81 to C2184/84 (w/ Full Size Spare Tire: C2185/85) 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 (w/ Full Size Spare Tire: C2185/85) are output only in test mode.

• *1: for FMVSS138 Type
• *2: for ECE-R64 Type

• *1: for FMVSS138 Type
• *2: for ECE-R64 Type
• *3: w/ Full Size Spare Tire

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.