C1124
DTC C1121 SENSOR 1 BATTERY LOWDTC C1122 SENSOR 2 BATTERY LOW
DTC C1123 SENSOR 3 BATTERY LOW
DTC C1124 SENSOR 4 BATTERY LOW
COMPONENT LOCATION
GENERAL DESCRIPTION
This transmitter is a transmitter device with tire valve, which is mounted in the valve hole of the wheel rim and transmits the pressure and temperature inside the tire, the battery voltage of the transmitter, and the tire identification code (ID) at normal and abnormal condition with the radio wave (RF) that conforms to the used area. Also this device has a countermeasure function such as the random delay of transmission time so that the RF signal from each tire will not interfere due to simultaneous transmission. Wheel sensors shall support usage on steel or aluminum rims.
Sensor transmissions continue when sensor status is 'Normal Fixed State'. Sensor transmissions stop when sensor status is 'Storage State' or the sensor battery runs out. The transmitter should transmit data at vehicle speeds between 0 mph (0 kph) and 186 mph (300 kph). Operating Temperature Range is -40 to 248 degrees F(-40 to 120 degrees C). Transmitter shall enter thermal shutdown once the measured temperature is greater than or equal to 257 degrees F (125 degrees C). The accuracy of the sensor is -9/12.6 degrees F (-5/7 degrees C) at this temperature, therefore the actual temperature may be 244.4 degrees F (118 degrees C). The sensor shall exit thermal shutdown once the temperature is less than or equal to 212 degrees F (100 degrees C). The transmitter shall have the capability to measure the internal battery voltage as an indicator of the end of life of the sensor. Since the unit is sealed, this parameter cannot be verified with a production unit.
[Tire Pressure Monitoring]
When 4 sensors have been learned as road wheels, it shall not be possible to learn new road wheel sensors on the same Ignition cycle. In normal mode low line, tire pressure and temperature shall be transmitted every 3 minutes 20 s nominally independent of vehicle operation. Monitoring shall be every 20 s. If sensor detects rapid deflation, then RF messages will be transmitted every 4 s for 1 minute duration. Communication from wheel sensors shall be via RF at a frequency of 315 MHz, 5 kBaud. Tire pressure measurement tolerance shall be ±7 kPa from 32 to 122 degrees F(0 to 50 degrees C) and ±17.5 kPa from -40 to 248 degrees F (-40 to 120 degrees C) with a range of 100 to 450 kPa. Tire temperature measurement tolerance shall be ±5.4 degrees F(±3 degrees C). from -4 to 158 degrees F(-20 to 70 degrees C) and ±9 degrees F(±5 degrees C) from -40 to 194 degrees F (40 to 90 degrees C) and -9/12.6 degree Fahrenheit (-5/7 degree Celsius) from -40 to 248 degree Fahrenheit (-40 to 120 degree Fahrenheit).
DTC DESCRIPTION
This DTC indicates that the sensor battery voltage level is Low. The most likely cause is battery passing it's expected life / excessively Low temperatures / sensor failure.
DTC DETECTING CONDITION
MONITOR SCANTOOL DATA
1. Park the vehicle on a level surface.
2. Connect 'TPMS exciter' or scan tool to Data Link Connector (DLC).
3. Select 'TPMS DIAGNOSIS" mode.
4. Select the "FULL" mode of 'CURRENT DATA" function.
5. Monitor the parameter of SENSOR 1 on the 'TPMS exciter' or scan tool after 13 minutes.
Specification: 'Sensor Temp.' is more than -4 degrees F(-20 degrees C) and 'Sensor battery value' is 'Normal'.
6. Is parameter within specifications?
YES
> Fault is intermittent. It might have been caused by low temperature.
> Go to "Verification of vehicle Repair" procedure.
NO
> Go to "Component Inspection" procedure.
COMPONENT INSPECTION
1. Turn ON 'TPMS exciter'.
2. Select "TIRE SNSR CON FIG (EXCITER)" mode.
3. Execute "SET SENSOR STATUS" of each wheel.
Specification: 'Sensor battery value' is 'Normal' and 'Sensor Temp.' is more than -4 degrees F(-20 degrees C).
4. Is any sensor data outside specification?
YES
> Check wheel / tire where abnormal sensor data was detected. Check for tire / wheel damage and overheated brake condition.
> Repair or replace if necessary and go to "Verification of Vehicle Repair" procedure.
> If it is OK, go to "Check wheel / tire" as follows.
No
> Check for sensor if unable to retrieve data with 'TPMS exciter'.
> Replace TPMS sensor if necessary and register sensor ID with 'TPMS exciter'.
> Go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect TPMS exciter or scan tool and select "Diagnostic Trouble Codes(DTCs)" mode
2. Using a TPMS exciter or scan tool, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present?
YES
> Go to the applicable troubleshooting procedure.
No
> System performing to specification at this time.