C1318

Component Location





General Description





[TPMS SENSOR : Wheel Electronic (WE) sensor unit]
Each vehicle wheel is fitted with a Wheel Electronic (WE) sensor unit attached to the valve on the inside of the wheel. The WE unit is powered with a self-contained battery utilizing a high temperature rated CR (Manganese Dioxide Lithium) chemistry. The operating voltage range for the WE module is 2.2 Vdc to 3.6 Vdc, and the operating temperature range is -40 °F to 257 °F(-40 °C ~125 °C). The WE measures tire pressure, temperature, and acceleration periodically. The pressure, temperature, and acceleration information is converted to digital form within the MCU inside the WE sensor.
The WE sensor is equipped with a Radio Frequency (RF) transmitter circuit which is used to periodically broadcast information from inside the tire. All WE sensor units operate on the same RF channel frequency, and each broadcast message includes pressure and temperature data, a unique ID code, operating state data, status information, and digital error-detection data.
The pressure measured by the WE sensor is an absolute pressure value. The pressure measurement range is 100 kPa to 450 kPa. The acceleration data is used within the WE sensor to determine whether the vehicle is moving or stationary. The acceleration status is the decision maker within the WE module that determines if the tire is moving or stationary. This measurement is used within the WE module to enable different operating modes depending on the status of the acceleration value. Over the fully specified operating temperature range, if the acceleration measurement is greater than or equal to 20G, the WE module assumes the tire is moving.
The basic function of the High Line(H/L) WE Sensor is to transmit 4 frames every minute when awake. The H/L WE sensor enters a low power sleep state where it does not transmit RF messages if it does not receive an LF Code 3 or is not rolling for more than 10 minutes.

DTC Description

This DTC indicates that "H/Line WE sensor" was installed to a L/Line system incorrectly.

DTC Detecting Condition





Component Inspection

1. Turn ON 'TPMS exciter'.
2. Select "TIRE SNSR CONFIG (EXCITER)" mode.
3. Execute "SET SENSOR STATUS" of Sensor1/Sensor2/Sensor3/Sensor4.
4. Monitor the parameter of Sensor1/Sensor2/Sensor3/Sensor4 on the 'TPMS exciter'.

Specification : 'SENSOR OPTION' is 'Low'.





5. Is parameter within specifications?
YES
> Substitute with a known-good TPMS receiver module and check for proper operation.
> If the problem is corrected, replace TPMS receiver module and then go to "Verification of Vehicle Repair" procedure.
NO
> Replace Sensor1/Sensor2/Sensor3/Sensor4 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 scantool and select "Diagnostic Trouble Codes(DTCs)" mode
2. Using a TPMS exciter or scantool, 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.