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When the vehicle is driven on a road surface covered with water at high speed, tires do not contact with
the road surface but rotate floating on a thin film of water.
It causes brake failure, lower traction force and losing the steering performance.
To prevent this, increase the tire inflation pressure, use tires with leaf shape tread which is not worn.
However, it is a best measure to drive slowly.
2) Hydro Planing
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1. SPECIFICATIONS
Unit Item Specification Remarks
TPMS ECUVoltage range 9 ~ 16 V -
Active mode 50 mA -
Coast mode 30 mA -
Sleep mode 100 uA -
Bit rate 500 Kbps -
Modulation type Amplitude modulation (AM) -
Frequency 433.92 Mhz -
Wheel modulePressure measuring
range0 ~ 6.375 bar
(0~92.43 psi)1 bar = about 14.5 psi
Tolerance range of
measured pressure
-
Tolerance range of
measured temperature
-
Temperature
measuring range
-
Battery lifeLithium battery
(about 3.0~3.2 V),
160,000 km or 10 yearsIt can be shortened
depending on use
condition.
Tire Inflation pressure 32 psi -
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Display on cluster
TPMS warning lamp
Global warning lamp
DOT LCD display
6. DISPLAY AND WARNING LAMPS RELATED TO TPMS
This lamp comes on when the engine is initially started or the ignition
switch is pressed ON (for about 4.0 seconds). Then, it goes off if the
system is normal.
It comes on if an error occurs in any component related to the TPMS
regardless of tire inflation pressure. -
-
This lamp comes on when the engine is initially started or the ignition
switch is pressed ON (for about 4.0 seconds). Then, it goes off if the
system is normal.
In the event of TPMS system (including sensor) failure, it flashes for 70
seconds at interval of 0.4 seconds and comes on.
Comes on when the tire pressure is low. -
-
-
It informs the driver of current tire pressure and abnormalities such as
loss or over inflation by displaying them on the display.
The driver can see the current tire pressure by pressing the TRIP
switch (press for 80 ms~1 sec.). -
-
DOT LCD display presentation sequence
Supervision type
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Display on cluster
TPMS warning lamp
Global warning lamp
DOT display
This lamp comes on when the engine is initially started or the ignition
switch is pressed ON (for about 4.0 seconds). Then, it goes off if the
system is normal.
It comes on if an error occurs in any component related to the TPMS
regardless of tire inflation pressure. -
-
This lamp comes on when the engine is initially started or the ignition
switch is pressed ON (for about 4.0 seconds). Then, it goes off if the
system is normal.
In the event of TPMS system (including sensor) failure, it flashes for 70
seconds at interval of 0.4 seconds and comes on.
Comes on when the tire pressure is low. -
-
-
The tire pressure for front wheels is displayed on the LCD display. The
tire pressure for rear wheels is displayed when pressing the Trip switch. -
Standard type
DOT display presentation sequence
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7. TIRE INFLATION PROCEDURE FOR VEHICLE WITH TPMS
1) Overview
For the vehicle with TPMS, the tire should be inflated in a method different from the conventional method
since the tire pressure values displayed on the tire pressure gauge and instrument cluster are different
after inflation.
The tire pressure displayed on the instrument cluster should be checked after a certain time delay
(wireless transmission time for wheel module).
The displayed value can be changed after driving even if it was set to the specified value.
2) Tire Inflation Procedure
Park the vehicle on a flat ground and let everyone get off the vehicle. A.
This symptom is occurred as the inflation pressure displayed on the instrument cluster becomes
different by tires as different load is applied to each tire due to driving condition, number of
occupants, irregular temperature change in tire and load condition.
If there is another vehicle equipped with the TPMS, keep the distance from this vehicle for at
least 5 mm to prevent interference of wheel module transmission.
Unload cargoes if they are usually not loaded during driving.
The instrument cluster does not display every pressure change while the air is injected or
discharged to/from the tire. This is because the wheel module sends the pressure value to the
TPMS ECU every minute.
In addition, if there are other vehicles with the TPMS nearby, it might take several minutes to
display the pressure values due to radio jamming and weather condition. -
-
-
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Tire inflation procedure
Check tire pressure on instrument cluster
DOT LCD display
Normal tire pressure Improper tire pressure
Tire inflation & judgment B.
Fill the tire pressure (air) according to the tire inflation procedure. -
Fill specified tire pressure
(32 psi)
Drive vehicle at 20 km/h or higher
for less than 10 min.
If checking for the tire
shows it is normal, carry
out the work again
according to the tire
inflation procedure.
Finish
Not OK
OK
Supervision type
Standard type
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Cautions for TPMS tire inflation
If the tire pressure is 10 psi lower than
the specification (32 psi), replace the
valve insert on the wheel module valve
body with a new one and inject air into
the tire. -