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
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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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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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When using a commercially available computerized wheel alignment equipment
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Specifications
Specification
Item
Specification
Type
Motor Driven Power Steering
Steering gear
Type ...
Other information:
11. Immediately drive approximately 7~10 km or, about 10 min (4~6 miles) to evenly
distribute the sealant in the tire.
Do not exceed a speed of 80 km/h (50 mph). If possible, do not fall below a speed
of 20 km/h (12 mph).
While driving, if you experience any unusual vibration, ride disturban ...
Description and operation
Description
Continuous Variable Valve Timing (CVVT) system advances or retards the valve
timing of the intake and exhaust valve in accordance with the ECM control signal
which is calculated by the engine speed and load.
By controlling CVVT, the valve ove ...
Alignment
Steering System