Kia Rio: Brake System / ESC (Electronic Stability Control) System

Kia Rio 2017-2020 YB Service Manual / Brake System / ESC (Electronic Stability Control) System

Components and components location
Components

1. ESC control module
2. Front wheel speed sensor
3. Rear wheel speed sensor

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.

Solenoid valve
Continuity
Valve
Motor pump
TC Valve
IN (NO)
OFF
OPEN
OFF
OFF
OUT (NC)
OFF
CLOSE

2.

ESC operation

Solenoid valve
Continuity
Valve
Motor pump
TC Valve
Understeering
(Only inside of
rear wheel)
IN(NO)
OFF
OPEN
ON
ON
OUT(NC)
OFF
CLOSE
Oversteering
(Only outside
of front wheel)

IN(NO)
OFF
OPEN
OUT(NC)
OFF
CLOSE

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.

Schematic diagrams
Schemaitc Diagrams

Terminal Function

Pin No
Description
Current
Resistance
Remark
(AMPS)
(mΩ)
1
B+ PUMP MOTOR POWER
137(RUSH)
10

2
C-CAN Low
30 mA
250

5
ITPMS Reset Switch Inout
10mA
250

11
PARKING BRAKE SWITCH SIGNAL
10mA
250

13
GND_PUMP MOTOR GROUND
137(RUSH)
10

14
C-CAN High
30 mA
250

16
BRAKE LIGHT SWITCH SIGNAL
10 mA
250

17
WHEEL SPEED OUTPUT (FR)
16mA
250

18
WHEEL SPEED SENSOR POWER (FR)
30 mA
250

19
WHEEL SPEED SENSOR POWER (RR)
30 mA
250

20
WHEEL SPEED SENSOR SIGNAL GROUND (RL)
16.8 mA
250

21
WHEEL SPEED SENSOR SIGNAL GROUND (FL)
16.8 mA
250

22
L-CAN HIGH
30 mA
250

23
ESC ON/OFF SWITCH SIGNAL
10 mA
250

24
HAC DRIVE SIGNAL
200 mA
250

25
BATTERTY(+) SOLENOID
40
10

27
ESS DRIVE SIGNAL
200mA
250

29
IGNITION1
50mA
60

31
WHEEL SPEED SENSOR SIGNAL GROUND (FR)
16.8mA
250

32
WHEEL SPEED SENSOR SIGNAL GROUND (RR)
16.8mA
250

33
WHEEL SPEED SENSOR POWER (RL)
30mA
250

34
WHEEL SPEED SENSOR POWER (FL)
30 mA
250

35
L-CAN LOW
30 mA
250

36
REVERSE GEAR SWITCH SIGNAL
10mA
250

37
CLUTCH SWITCH SIGNAL
10 mA
250

38
GROUND
40
10


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