DESCRIPTION
The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the air pressures of the tires. 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 comes on. The tire pressure warning ECU stores a DTC when the tire pressure warning valve and transmitter stops transmitting signals. At this time, forcibly transmit the signals by releasing the tire pressure rapidly. The stored DTC is cleared when the signal transmission is resumed.
| DTC Code | Detection Condition | Trouble Area |
|---|---|---|
| C2111/11 C2112/12 C2113/13 C2114/14 C2115/15 | Tire pressure warning valve and transmitters stop transmitting signals | Tire pressure warning valve and transmitter Tire pressure warning ECU |
DTC DETECTION CONDITION TABLE
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.
Scheme 1
The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the air pressure of the tires. 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 comes 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 is unable to receive the signals from the tire pressure warning valves 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.
HINT
When no signals are received for 51 minutes or more, a DTC is output.
DTCs from C2121/21 to C2125/25 can only be cleared by using the tester. 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.
| DTC Code | Detection Condition | Trouble Area |
|---|---|---|
| C2121/21 C2122/22 C2123/23 C2124/24 C2125/25 | These DTCs are detected when no signals are received for 51 minutes or more, and then vehicle is driven at 8 km/h (5 mph) or higher and the ECU receives no signals for 12 minutes or more. | Tire pressure warning valve and transmitter Tire pressure warning antenna and receiver Wire harness or connector Tire pressure warning ECU |
| C2181/81 C2182/82 C2183/83 C2184/84 C2185/85 | Test mode procedure is performed. | Tire pressure warning valve and transmitter Tire pressure warning antenna and receiver Wire harness or connector Tire pressure warning ECU |
DTC DETECTION CONDITION TABLE
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.
The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the air pressure of the tires. 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 comes on.
When the internal circuit of a tire pressure warning valve and transmitter is malfunctioning, one of these DTCs are output.
| DTC Code | Detection Condition | Trouble Area |
|---|---|---|
| C2141/41 C2142/42 C2143/43 C2144/44 C2145/45 | If an "ERROR" signal is received 3 times consecutively, the tire pressure warning valve and transmitter will be judged as defective and a DTC will be output. This will happen in situations where the inflation pressure is outside the absolute pressure range 0 to 637.5 kPa (0 to 6.5 kgf/cm 2 , 0 to 92.5 psi), outside the relative pressure range -100 to 537.5 kPa (-1 to 5.4 kgf/cm 2 , -14 to 78 psi), the temperature inside the tire is outside the specified range -40 to 120°C (-40 to 253°F), or an error occurs in the tire pressure warning valve and transmitter or the surrounding area. | Tire pressure warning valve and transmitter Tire pressure warning ECU |
DTC DETECTION CONDITION CHART
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.
Each tire pressure warning valve and transmitter measures the internal temperature of its tire as well as tire pressure, and transmits the information to the tire pressure warning ECU along with the transmitter ID. If the measured temperature is out of the specified range, the tire pressure warning ECU recognizes it as a malfunction, outputs DTCs, and blinks the tire pressure warning light.
| DTC Code | Detection Condition | Trouble Area |
|---|---|---|
| C2165/65 C2166/66 C2167/67 C2168/68 C2169/69 | Temperature inside the tire exceeds 119°C (246.2°F) more than once. | Tires Tire pressure warning valve and transmitter Tire pressure warning ECU |
DTC DETECTION CONDITION TABLE
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.
The IDs of each tire pressure warning valve and transmitter are registered to the tire pressure warning ECU.
When the ECU detects that an ID is not one of the registered IDs, or cannot receive an ID signal, a DTC is output.
| DTC Code | Detection Condition | Trouble Area |
|---|---|---|
| C2171/71 | Transmitter ID code is not registered. (When an ID code is unregistered for 51 minutes or more) | Tire pressure warning ECU |
DTC DETECTION CONDITION TABLE
The signals 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.
| DTC Code | Detection Condition | Trouble Area |
|---|---|---|
| C2176/76 | DTC is stored when any of the following is detected: Malfunction in the tire pressure warning ECU internal circuit. Terminal RF5V is shorted to ground. Malfunction in the tire pressure warning antenna and receiver internal circuit. | Tire pressure warning antenna and receiver Wire harness or connector Tire pressure warning ECU |
DTC DETECTION CONDITION TABLE
Scheme 2
The tire pressure warning ECU receives a speed signal from the combination meter. This DTC is stored upon entering test mode, and cleared when a vehicle speed signal of 20 km/h (12 mph) is detected for 3 seconds or more. This DTC is output only in test mode.
| DTC Code | Detection Condition | Trouble Area |
|---|---|---|
| C2191/91 | Speed sensor circuit malfunction | Vehicle speed sensor Combination meter Wire harness or connector Tire pressure warning ECU |
DTC DETECTION CONDITION TABLE
Scheme 3
If the ECU detects trouble, the tire pressure warning light blinks and the tire pressure monitor is canceled at the same time. At this time, the ECU records a DTC in the memory.
Connecting terminals TC and CG of the DLC3 makes the tire pressure warning light blink and output the DTC.
Scheme 4
This is the power source for the tire pressure warning ECU.
Scheme 5
DTC output mode is set by connecting terminals 13 (TC) and 4 (CG) of the DLC3. The DTCs are indicated by the blinking of the tire pressure warning light.
Scheme 6
HINT
When each warning light blinks continuously, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in an ECU connected to this circuit may have occurred.
See also:
• REMOVAL