Operation CHARM: Car repair manuals for everyone.

Receiver

RECEIVER




The receiver has a built-in antenna.

The receiver collects tire pressure data from the transmitters, and turns on the indicator to warn the driver when it concludes that the tire pressure has dropped below a certain value.

The receiver is provided with a system fault diagnosis function.

RECEIVER FUNCTIONS
- Receiving function: Receives data from the transmitters and decides whether the data is valid or not.
- Pressure judgment function: The indicator turns ON to warn the driver if the tire pressure drops below the preset value (180 kPa, 1.835 kgf/sq.cm, 26.11 psi). At the same time, a diagnostic trouble code is stored in the memory inside the receiver to identify which tire has low pressure. (low pressure detection turns ON at 180 kPa (1.835 kgf/sq.cm , 26.11 psi), turns OFF at 200 kPa (2.039 kgf/sq.cm , 29.01 psi))
- Diagnosis function: The indicator flashes and a diagnostic trouble code is stored in the memory inside the receiver if a system abnormality such as data reception failure, bad received data, or bad transmitter condition is detected.

CONDITIONS JUDGED AS A FAILURE
The receiver decides that the system has failed when any of the following conditions is met.
- EEPROM abnormal: The written data does not coincide with the loaded data when the ID is registered.
- Data reception failure: Transmitter data could not be received for 10 minutes or more while driving at a speed exceeding 40 km/h (24.9 MPH).
- Function code abnormal: 'He-measure" function code is received for 5 times in series, though the pressure change compared to the last data was within 7 kPa (0.071 kgf/sq.cm , 1.02 psi) while driving at a speed exceeding 40 km/h (24.9 MPH).
- Air pressure data abnormal: "FFH"* pressure data has been received for 5 times in series while driving at a speed exceeding 40 km/h (24.9 MPH).
- Low battery: Function code for the "low battery" mode has been received for 20 times or more in series.
- Vehicle speed sensor abnormal: Function code for the "wake" mode has been received while the vehicle speed signal is 6 km/h (3.7 MPH) or lower.

*FFH is transmitted when the pressure data exceeds the upper limit (352kPa, 3.59 kgf/sq.cm , 51.05 psi) of pressure detection.

If the indicator comes ON due to low tire pressure, the indicator will turn OFF when the under-inflated tire is inflated to normal pressure.