38 TIRE ND WHEEL TIRE PRESSURE WRNING SYSTEM 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 C2125/25 No Signal from Transmitter ID5 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) DTC C2185/85 Transmitter ID5 not Received (Test Mode DTC) DESCRIPTION The tire warning valve and transmitters that are installed in the tire and wheel assemblies measure the air of the tires. The measured values are transmitted to the tire warning antenna and receiver on the body as radio waves and then sent to the tire warning ECU. The ECU compares the measured air values with the air threshold. When the measured air value is less than this threshold, the warning light in the combination meter comes on. The tire warning valve and transmitters constantly send radio waves to the tire warning antenna and receiver. Under the conditions below, the tire warning antenna and receiver is unable to receive the signals from the tire 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. 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 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 rea C2121/21 C2122/22 C2123/23 C2124/24 C2125/25 C2181/81 C2182/82 C2183/83 C2184/84 C2185/85 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. Test mode procedure is performed. Tire warning valve and transmitter Tire warning antenna and receiver Wire harness or connector Tire warning ECU Tire warning valve and transmitter Tire warning antenna and receiver Wire harness or connector Tire warning ECU
TIRE ND WHEEL TIRE PRESSURE WRNING SYSTEM 39 It is necessary to perform the procedure to identify the tire warning valve and transmitter that is malfunctioning because it cannot be identified by the output DTC. WIRING DIGRM Receiver (for Front RH) Receiver (for Front LH) Receiver (for Rear RH) Receiver (for Rear LH) 11 GND Receiver (for Spare) +5V 5 8 RF5V RD 1 7 RD GND 4 16 GND2 T17 Tire Pressure Warning ntenna and Receiver T16 Tire Pressure Warning ECU C150483E01 INSPECTION PROCEDURE NOTICE: When replacing the tire warning ECU, read the IDs stored in the ECU using the intelligent tester and write them down before removal.
40 TIRE ND WHEEL TIRE PRESSURE WRNING SYSTEM It is necessary to perform registration (see page -13) of the transmitter IDs into the tire warning ECU after the ECU and/or valve and transmitter has been replaced. 1 CHECK FREQUENCY RECEIVING CONDITION NG Check if the vehicle is located in areas such as the ones described below: (1) Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle. If the vehicle is located in areas described above, the tire warning light may come on only in a particular area. (2) Devices using similar radio frequencies are used in the vehicle. OK: Facilities, or devices that use similar radio frequencies are not located in the vicinity of the vehicle. Radio frequency may be interrupted due to surroundings or devices installed by user. CHECK IF NY DEVICE IS INSTLLED Y USER OK 2 IDENTIFY TRNSMITTER CORRESPONDING TO DTC Tire warning ECU (b) (c) (d) (e) Set the tire to the appropriate specified values (see page -1). Turn the ignition switch OFF. Connect the intelligent tester to the DLC3. Turn the ignition switch ON and turn the tester ON. Select "TIREPRESS" by following the prompts displayed on the intelligent tester. TIREPRESS1 TIREPRESS2 ID1 tire inflation / max.: bsolute / 637.5 kpa (6.5 kgf/cm 2, 92.5 psi), Relative / 537.5 kpa (5.4 kgf/ ID2 tire inflation / max.: bsolute / 637.5 kpa (6.5 kgf/cm 2, 92.5 psi), Relative / 537.5 kpa (5.4 kgf/ displayed for absolute or displayed for relative, displayed for absolute or displayed for relative,
TIRE ND WHEEL TIRE PRESSURE WRNING SYSTEM 41 TIREPRESS3 TIREPRESS4 TIREPRESS5 ID3 tire inflation / max.: bsolute / 637.5 kpa (6.5 kgf/cm 2, 92.5 psi), Relative / 537.5 kpa (5.4 kgf/ ID4 tire inflation / max.: bsolute / 637.5 kpa (6.5 kgf/cm 2, 92.5 psi), Relative / 537.5 kpa (5.4 kgf/ ID5 tire inflation / max.: bsolute / 637.5 kpa (6.5 kgf/cm 2, 92.5 psi), Relative / 537.5 kpa (5.4 kgf/ displayed for absolute or displayed for relative, displayed for absolute or displayed for relative, displayed for absolute or displayed for relative, (f) (g) (h) *: It may take about 2 or 3 minutes until the values are displayed. Rapidly reduce the tire for each wheel at least 40 kpa (0.4 kgf/cm 2, 5.8 psi) within 30 seconds. Check the DT LIST. NOTICE: It may take about 2 or 3 minutes until the values are displayed. When no "TIREPRESS" data has changed, reset the tire to the appropriate specified value and rotate the tire 90 to 270 degrees. Then rapidly release the tire and recheck it. Record the "TIREPRESS" data transmitter ID that corresponds to each tire. fter confirming that "TIREPRESS" data for one tire (ID1 to ID5) has changed, repeat this procedure one by one. Identify the transmitter that corresponds to the DTC. Condition One or more of transmitters abnormal ll normal ll abnormal Proceed to C Go to step 4 END C
42 TIRE ND WHEEL TIRE PRESSURE WRNING SYSTEM 3 CHECK HRNESS ND CONNECTOR (ECU - RECEIVER) Rear view of wire harness connector: (to Tire Pressure Warning ECU) Rear view of wire harness connector: (to Tire Pressure Warning ntenna and Receiver) 7 (RD) 8 (RF5V) 16 (GND2) T16 5 (+5V) 4 (GND) T17 1 (RD) C150484E01 Disconnect the T16 ECU connector. (b) Disconnect the T17 receiver connector. (c) Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition T16-7 (RD) - T17-1 (RD) lways T16-8 (RF5V) - T17-5 (+5V) lways elow 1 Ω T16-16 (GND2) - T17-4 (GND) lways T16-7 (RD) or T17-1 (RD) - ody ground lways T16-8 (RF5V) or T17-5 (+5V) - ody ground T16-16 (GND2) or T17-4 (GND) - ody ground lways lways 10 kω or higher NG REPIR OR REPLCE HRNESS OR CONNECTOR OK 4 INSPECT TIRE PRESSURE WRNING ECU Tire warning ECU (b) (c) (d) Turn the ignition switch OFF. Connect the intelligent tester to the DLC3. Turn the ignition switch ON and turn the tester ON. Select REGIT ID CODE by following the prompts displayed on the intelligent tester. REGIT ID1 CODE REGIT ID2 CODE Registered ID1 code/ Registered ID2 code/ transmitter ID1 is displayed transmitter ID2 is displayed
TIRE ND WHEEL TIRE PRESSURE WRNING SYSTEM 43 REGIT ID3 CODE REGIT ID4 CODE REGIT ID5 CODE Registered ID3 code/ Registered ID4 code/ Registered ID5 code/ transmitter ID3 is displayed transmitter ID4 is displayed transmitter ID5 is displayed (e) Check the ID number on the identified transmitter by removing it from the tire and wheel. Transmitter: Transmitter ID (7 Digit Number) E128762E10 (f) Confirm that the ID number on the transmitter and recorded transmitter ID match. Match Do not match Proceed to Go to step 6 5 REPLCE TIRE PRESSURE WRNING VLVE ND TRNSMITTER Replace the warning valve and transmitter (see page -73). NEXT 6 REGISTRTION OF TRNSMITTER ID Perform registration (see page -13). NEXT 7 RED VLUE OF DT LIST Turn the ignition switch OFF.
44 TIRE ND WHEEL TIRE PRESSURE WRNING SYSTEM Tire warning ECU (b) (c) (d) Connect the intelligent tester to the DLC3. Turn the ignition switch ON and turn the tester ON. Select "TIREPRESS" by following the prompts displayed on the intelligent tester. TIREPRESS1 TIREPRESS2 TIREPRESS3 TIREPRESS4 TIREPRESS5 ID1 tire inflation / max.: bsolute / 637.5 kpa (6.5 kgf/cm 2, 92.5 psi), Relative / 537.5 kpa (5.4 kgf/ ID2 tire inflation / max.: bsolute / 637.5 kpa (6.5 kgf/cm 2, 92.5 psi), Relative / 537.5 kpa (5.4 kgf/ ID3 tire inflation / max.: bsolute / 637.5 kpa (6.5 kgf/cm 2, 92.5 psi), Relative / 537.5 kpa (5.4 kgf/ ID4 tire inflation / max.: bsolute / 637.5 kpa (6.5 kgf/cm 2, 92.5 psi), Relative / 537.5 kpa (5.4 kgf/ ID5 tire inflation / max.: bsolute / 637.5 kpa (6.5 kgf/cm 2, 92.5 psi), Relative / 537.5 kpa (5.4 kgf/ displayed for absolute or displayed for relative, displayed for absolute or displayed for relative, displayed for absolute or displayed for relative, displayed for absolute or displayed for relative, displayed for absolute or displayed for relative, Condition ll tire readings are equal to specified values. Tire values are not displayed. *: It may take about 2 or 3 minutes until the values are displayed. Proceed to END 8 REPLCE TIRE PRESSURE WRNING NTENN ND RECEIVER Replace the tire warning antenna and receiver (see page -70). NEXT
TIRE ND WHEEL TIRE PRESSURE WRNING SYSTEM 45 9 RED VLUE OF DT LIST Tire warning ECU (b) (c) (d) Turn the ignition switch OFF. Connect the intelligent tester to the DLC3. Turn the ignition switch ON and turn the tester ON. Select "TIREPRESS" by following the prompts displayed on the intelligent tester. TIREPRESS1 TIREPRESS2 TIREPRESS3 TIREPRESS4 TIREPRESS5 ID1 tire inflation / max.: bsolute / 637.5 kpa (6.5 kgf/ cm 2, 92.5 psi), Relative / 537.5 kpa (5.4 kgf/ ID2 tire inflation / max.: bsolute / 637.5 kpa (6.5 kgf/ cm 2, 92.5 psi), Relative / 537.5 kpa (5.4 kgf/ ID3 tire inflation / max.: bsolute / 637.5 kpa (6.5 kgf/ cm 2, 92.5 psi), Relative / 537.5 kpa (5.4 kgf/ ID4 tire inflation / max.: bsolute / 637.5 kpa (6.5 kgf/ cm 2, 92.5 psi), Relative / 537.5 kpa (5.4 kgf/ ID5 tire inflation / max.: bsolute / 637.5 kpa (6.5 kgf/ cm 2, 92.5 psi), Relative / 537.5 kpa (5.4 kgf/ displayed for absolute or -100 kpa (-1 relative, data has not been displayed for absolute or -100 kpa (-1 relative, data has not been displayed for absolute or -100 kpa (-1 relative, data has not been displayed for absolute or -100 kpa (-1 relative, data has not been displayed for absolute or -100 kpa (-1 relative, data has not been Condition ll tire readings are equal to specified values. Tire values are not displayed. *: It may take about 2 or 3 minutes until the values are displayed. Proceed to REPLCE TIRE PRESSURE WRNING ECU (See page -78) END