Kia Sedona: Description and Operation
Third generation YP (2014-2024) / Kia Sedona YP Service Manual / Brake System / ESC(Electronic Stability Control) System / Description and Operation
| Description of ESC |
Electronic Stability Control (ESC) recognizes critical
driving conditions, such as panic reactions in dangerous situations, and
stabilizes the vehicle by wheel-individual braking and engine control
intervention.
ESC adds an additional function known as Active Yaw Control
(AYC) to the ABS, TCS, EBD and ESC functions. On contrary, the ABS/TCS
function controls wheel slip during braking and accelerating, and thus,
mainly intervenes in the longitudinal dynamics of the vehicle, and the
active yaw control stabilizes the vehicle on the vertical axis.
This is achieved by wheel individual brake intervention and
adaptation of the momentary engine torque with no need for any action to
be taken by the driver.
ESC essentially consists of three assemblies : the sensors, the electronic control unit and the actuators.
The stability control feature works under all driving and
operating conditions. Under certain driving conditions, the ABS/TCS
function can be activated simultaneously with the ESC function in
response to a command by the driver.
In the event of a failure of the stability control function, the basic safety function, ABS, is still maintained.
Description of ESC Control
ESC system consists of ABS/EBD, TCS and AYC functions.
ABS/EBD function : The ECU changes the active sensor signal
(current shift) coming from the four wheel sensors into square waves. By
using the input of above signals, the ECU calculates the vehicle speed
and the acceleration & deceleration of the four wheels. And, the ECU
judges whether the ABS/EBD should be actuated or not.
TCS function prevents the wheel slip of drive direction by
adding the brake pressure and engine torque reduction via CAN
communication. TCS function uses the wheel speed sensor signal to
determine the wheel slip as far as ABS function.
AYC function prevents unstable maneuver of the vehicle. To
determine the vehicle maneuver, AYC function uses the maneuver sensor
signals (Yaw Rate Sensor, Lateral Acceleration Sensor, and Steering
Wheel Angle Sensor).
If vehicle maneuver is unstable (Over Steer or Under Steer),
AYC function applies the brake pressure on certain wheel, and sends
engine torque reduction signal by CAN.
After the key-on, the ECU continuously diagnoses the system
failure (self-diagnosis). If the system failure is detected, the ECU
informs driver of the system failure through the BRAKE/ABS/ESC warning
lamp (fail-safe warning).
Input and Output Diagram
| ESC Operation Mode |
| ESC Hydraulic System Diagram |
| 1. |
ESC Non-operation : Normal braking.
|
| 2. |
ESC operation
| ||||||||||||||||||||||
ABS Warning Lamp module
The active ABS warning lamp module indicates the self-test
and failure status of the ABS. The ABS warning lamp is turned on under
the following conditions:
| – |
During the initialization phase after IGN ON. (continuously 3 seconds). |
| – |
In the event of inhibition of ABS functions by failure. |
| – |
During diagnostic mode. |
| – |
When the ECU Connector is seperated from ECU. |
| – |
Cluster lamp is ON when communication is impossible with CAN module.
|
EBD/Parking Brake Warning Lamp Module
The active EBD warning lamp module indicates the self-test
and failure status of the EBD. However, in case the Parking Brake Switch
is turned on, the EBD warning lamp is always turned on regardless of
EBD functions. The EBD warning lamp is turned on under the following
conditions:
| – |
During the initialization phase after IGN ON. (continuously 3 seconds). |
| – |
When the Parking Brake Switch is ON or brake fluid level is low. |
| – |
When the EBD function is out of order . |
| – |
During diagnostic mode. |
| – |
When the ECU Connector is seperated from ECU. |
| – |
Cluster lamp is ON when communication is impossible with CAN module. |
ESC Function/Warning Lamp
The ESC function/warning lamp indicates the self-test and failure status of the ESC.
The ESC function/warning lamp is turned on under the following conditions:
| – |
During the initialization phase after IGN ON. (continuously 3 seconds). |
| – |
When the ESC function is inhibited by system failure. |
| – |
When the ESC control is operating. (Blinking - 2Hz) |
| – |
During diagnostic mode.(Except standard mode) |
| – |
Cluster lamp is ON when communication is impossible with CAN module.
|
ESC Off Lamp
The ESC Off lamp indicates the self-test and operating status of the ESC.
The ESC Off lamp operates under the following conditions :
| – |
During the initialization mode after IGN ON. (continuously 3 seconds). |
| – |
ESC Off lamp is On when driver input the ESC Off switch.
|
ESC On/Off Switch
The ESC On/Off Switch is used to toggle the ESC function between On/Off states based upon driver input.
The On/Off switch is a normally open, momentary contact switch. Closed contacts switch the circuit to ignition.
Initial status of the ESC function is on and switch toggle state.
Components and Components Location
Components
1. HECU module2. Front wheel speed sensor3. Rear wheel speed sensor4. Yaw rate & Lateral G sensor5. Steering Angle Senser6. ABS Warning lamp7. Parking brake/EBD warning lamp8. ESC ...
Schematic Diagrams
Circuit Diagram - ESC (1)
Circuit Diagram - ESC (2)
Circuit Diagram - ESC (3)
Circuit Diagram - ESC (4)
ESC connector input/output
Pin NoConnector TerminalPin NoConnector Terminal1WE/R Junc ...
Other Information:
Resetting the sunroof
Whenever the vehicle battery is disconnected or discharged, you must reset your
sunroof system as follows:
1. Turn the ignition switch to the ON position.
2. Close the sunshade and sunroof complet ...
Rear Disc Brake Components and Components Location
Components
1. Guide rod bolt2. Bleed screw3. Caliper carrier4. Caliper body5. Inner pad shim6. Brake pad7. Pad retainer
...
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