Kia Picanto: Suspension System / Tire Pressure Monitoring System
Components and components location
1. HECU
2. Cluster
3. TPMS SET Switch
| 4. Wheel speed sensor
5. Tone wheel
|
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
|
Direct TPMS
|
 |
 |
| •
| The turning radius of the tire and change in tire stiffness are calculated indirectly. |
| •
| No air pressure sensor needs to be installed in the unit. |
| •
| The
recommended tire pressure has to be re-saved after replacing a tire or
adjusting air pressure (by pressing the "SET" button). |
| | •
| The infaltion pressure inside the tire is measured using a sensor and then wirelessly transmitted to the unit. |
| •
| A separate unit and four air pressure sensors are required to be installed. |
| •
| Poor performance may occur due to frequency noises as the direct TPMS adopts a wireless transmission method. |
|
Low tire pressure warning lamp
| 1. | Turn-on condition | •
| • When tire pressure is below the allowed threshold |
|
| 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. |
|
Interferences to normal function of indirect TPMS
Type
|
Conditions
|
Symptoms
|
Possible cause
|
Driving conditions
| Low speed driving
| Driving continuously at less than 25kph
| No warning issued
| Lower reliability of the wheel speed sensor data
|
High speed driving
| Driving continuously at more than 120kph
| Lower performance
| Tire characteristics
|
Deceleration/Acceleration
| Rapid acceleration/ brake
| Delay of warning
| Lack of effective information
|
Road condition
| Sharp curve or crooked road
| Delay of warning
| Lack of effective information
|
Road surface condition
| Unpaved or slippery road surfaces
| Delay of warning
| Lack of effective information
|
Snow chain
| Snow chains are mounted on the vehicle's tires
| No warning issued
| Lower reliability of the wheel speed sensor data
|
Troubleshooting
Symptom
|
Possible cause
|
Remedy
|
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
| | •
| SET button has not been pressed after tire replacement or air pressure adjustment. |
| | 1. | Check the air pressure. |
| 2. | Check that the wheel inch variant coding procedure has been correctly performed. | –
| If the coding is inconsistent with vehicle's options e.g.wheel size,etc. repeat the procedure. |
|
| 3. | Check the recommended tire pressure level and then press the SET button. | –
| Do not press the SET button without verifying the air pressure. |
| –
| Warning light may not be illuminated when driving with snowchains installed, or driving on unpaved roads. |
|
|
| •
| SET button has been pressed at the incorrect pressure. |
| –
| SET
button has been pressed at the low pressure without filling the tire(s)
to specified pressures (regardless of the warning light illumination).
|
| –
| SET button has been pressed with tires over or under inflated. |
| –
| SET button has been pressed with significant differences in pressure between tires. |
|
| •
| When driving with snowchains installed |
|
| •
| When driving mainly on unpaved/ curved roads |
|
Repair procedures
| Indirect TPMS Reset Procedure |
| 1. | Adjust pressure in all 4 tires to the recommended air pressure. |
| 2. | Press the SET button for more than 3 seconds to store the pressure. |
| 3. | Check if system warning light blinks for 4 seconds. (turn off after blinking) |
| 4. | Perform the learning procedure through driving. | •
| Perform the learning procedure on a level surface. |
| •
| At least 20 minutes of learning time is required. |
|
|
| Diagnosis procedure using a diagnostic device |
Perform the indirect TPMS variant coding using a diagnostic device in case of ESC module replacement.
Repair procedures
Front wheel alignment
When
using a commercially available computerized wheel alignment equipment
to inspect the front wheel alignment, always positio ...
Specifications
Specification
Item
Specification
Type Motor Driven Power Steering Steering gear Type Rack & Pinion Rack ...
Other information:
Repair procedures
Inspection
1.Disconnect the negative (-) battery terminal.
2.Remove the roof trim assembly.
(Refer to Body - "Roof Trim Assembly")
3.Remove the glass motor (A) after loosening the mounting screws.
4.Ground the terminals as below table, and check t ...
Using the smart key
Park the vehicle and stop the engine.
Arm the system as described below.
1. Turn off the engine.
2. Make sure that all doors (and tailgate)
and the engine hood are
closed and latched.
3. • Lock the doors by pressing the
button of the front outside door
handle with ...
Alignment
Steering System