Kia Rio: Suspension System / Tire Pressure Monitoring System
Components and components location
1. HECU
2. Cluster
3. TPMS SET Switch
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4. Wheel speed sensor
5. Tone wheel
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Description and operation
Indirect Tire Pressure
Monitoring System (TPMS)
Using a wheel speed signal from the ESC, the system analyzes the turning radius
of the tire and change in tire stiffness to detect a pressure loss.
TPMS determines under-inflation by calculating pressure loss based on the specified
pressure. The recommened pressure must therefore be re-saved by operating the SET
button once tires are replaced or pressures are adjusted.
Differences between
direct and indirect TPMS
Indirect TPMS
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Direct TPMS
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| • |
The turning radius of the tire and change in tire stiffness are
calculated indirectly.
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| • |
No air pressure sensor needs to be installed in the unit.
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| • |
The recommended tire pressure has to be re-saved after replacing
a tire or adjusting air pressure (by pressing the "SET" button).
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| • |
The infaltion pressure inside the tire is measured using a sensor
and then wirelessly transmitted to the unit.
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| • |
A separate unit and four air pressure sensors are required to
be installed.
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| • |
Poor performance may occur due to frequency noises as the direct
TPMS adopts a wireless transmission method.
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Low tire pressure warning
lamp
| 1. |
Turn-on condition
| • |
• When tire pressure is below the allowed threshold
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| 2. |
Turn-off condition
| • |
When the low tire pressure warning light illuminates due to the
rapid leak, the warning light will extinguish if tire is inflated
above the warnning threshold.
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Interferences to normal
function of indirect TPMS
Type
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Conditions
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Symptoms
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Possible cause
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Driving conditions
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Low speed driving
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Driving continuously at less than 25kph
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No warning issued
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Lower reliability of the wheel speed sensor data
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High speed driving
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Driving continuously at more than 120kph
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Lower performance
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Tire characteristics
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Deceleration/Acceleration
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Rapid acceleration/ brake
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Delay of warning
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Lack of effective information
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Road condition
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Sharp curve or crooked road
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Delay of warning
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Lack of effective information
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Road surface condition
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Unpaved or slippery road surfaces
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Delay of warning
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Lack of effective information
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Snow chain
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Snow chains are mounted on the vehicle's tires
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No warning issued
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Lower reliability of the wheel speed sensor data
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Troubleshooting
Symptom
|
Possible cause
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Remedy
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Low tire pressure warning lamp turns on at the correct tire pressure/ Low
tire pressure warning lamp fails to turn on at the low pressure
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| • |
SET button has not been pressed after tire replacement or air
pressure adjustment.
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| 1. |
Check the air pressure.
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| 2. |
Check that the wheel inch variant coding procedure has been correctly
performed.
| –
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If the coding is inconsistent with vehicle's options
e.g.wheel size,etc. repeat the procedure.
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| 3. |
Check the recommended tire pressure level and then press the
SET button.
| –
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Do not press the SET button without verifying the air
pressure.
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| –
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Warning light may not be illuminated when driving with
snowchains installed, or driving on unpaved roads.
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| • |
SET button has been pressed at the incorrect pressure.
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| – |
SET button has been pressed at the low pressure without filling
the tire(s) to specified pressures (regardless of the warning light
illumination).
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| – |
SET button has been pressed with tires over or under inflated.
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| – |
SET button has been pressed with significant differences in pressure
between tires.
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| • |
When driving with snowchains installed
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| • |
When driving mainly on unpaved/ curved roads
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Repair procedures
| Indirect TPMS Reset Procedure |
| 1. |
Adjust pressure in all 4 tires to the recommended air pressure.
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| 2. |
Press the SET button for more than 3 seconds to store the pressure.
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| 3. |
Check if system warning light blinks for 4 seconds. (turn off after blinking)
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| 4. |
Perform the learning procedure through driving.
| •
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Perform the learning procedure on a level surface.
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| •
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At least 20 minutes of learning time is required.
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| Diagnosis procedure using a diagnostic
device |
Perform the indirect TPMS variant coding using a diagnostic device in case of
ESC module replacement.
Repair procedures
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