Kia Sedona (2008 year). Manual - part 1

2008 BRAKES

ABS (Anti-Lock Brake System) - Sedona 

COMPONENTS 

Fig. 1: Identifying ABS (Anti-Lock Brake System) Components 
Courtesy of KIA MOTORS AMERICA, INC. 

DESCRIPTION 

This specification applies to HCU (Hydraulic Control Unit) and ECU (Electronic Control Unit) of the HECU 
(Hydraulic and Electronic Control Unit). 

This specification is for the wiring design and installation of ABS/TCS/ESC ECU. 

 

2008 Kia Sedona 

2008 BRAKES ABS (Anti-Lock Brake System) - Sedona

  

 

2008 Kia Sedona 

2008 BRAKES ABS (Anti-Lock Brake System) - Sedona

  

Microsoft 

 

Saturday, May 22, 2010 6:52:41 PM

Page 1 

© 2006 Mitchell Repair Information Company, LLC. 

Microsoft 

 

Saturday, May 22, 2010 6:52:46 PM

Page 1 

© 2006 Mitchell Repair Information Company, LLC. 

This unit has the functions as follows. 



Input of signal from Pressure sensor, Steering angle sensor, Yaw & Lateral G sensor, the wheel speed 
sensors attached to each wheel.  



Control of braking force/traction force/yaw moment.  



Failsafe function.  



Self-diagnosis function.  



Interface with the external diagnosis tester.  

Installation position: engine compartment  



Brake tube length from master cylinder port to HECU inlet port should be max. 1 m  



The position should not be close to the engine block and not lower than the wheel.  

OPERATION 

The ECU shall be put into operation by switching on the operating voltage (IGN). 

On completion of the initialization phase, the ECU shall be ready for operation. 

In the operating condition, the ECU shall be ready, within the specified limits (voltage and temperature), to 
process the signals offered by the various sensors and switches in accordance with the control algorithm defined 
by the software and to control the hydraulic and electrical actuators. 

WHEEL SENSOR SIGNAL PROCESSING 

The ECU shall receive wheel speed signal from the four active wheel sensors. 

The wheel signals are converted to voltage signal by the signal conditioning circuit after receiving current signal 
from active wheel sensors and given as input to the MCU. 

SOLENOID VALVE CONTROL 

When one side of the valve coil is connected to the positive voltage that is provided through the valve relay and 
the other side is connected to the ground by the semiconductor circuit, the solenoid valve goes into operation. 

The electrical function of the coils are always monitored by the valve test pulse under normal operation 
conditions. 

VOLTAGE LIMITS 



Overvoltage 

When overvoltage is detected (above 16.8V), the ECU switches off the valve relay and shuts down the 
system. 

 

2008 Kia Sedona 

2008 BRAKES ABS (Anti-Lock Brake System) - Sedona

  

Microsoft 

 

Saturday, May 22, 2010 6:52:41 PM

Page 2 

© 2006 Mitchell Repair Information Company, LLC. 

When voltage is returned to operating range, the system goes back to the normal condition after the 
initialization phase. 



Undervoltage 

In the event of undervoltage (below 9.3V), ABS control shall be inhibited and the warning lamp shall be 
turned on. 

When voltage is returned to operating range, the warning lamp is switched off and ECU returns to normal 
operating mode. 

PUMP MOTOR CHECKING 

The ECU performs a pump motor test at a speed of 15km/h once after IGN is switched on. 

DIAGNOSTIC INTERFACE 

Failures detected by the ECU are encoded on the ECU, stored in a EEPROM and read out by diagnostic 
equipment when the ignition switch is turned on. 

The diagnosis interface can also be used for testing the ECU during production of the ECU and for actuating the 
HCU (Air-bleeding line or Roll and Brake Test line). 

WARNING LAMP MODULE 

Fig. 2: Identifying Warning Lamp Module 
Courtesy of KIA MOTORS AMERICA, INC. 

1. ABS WARNING LAMP MODULE 

The active ABS warning lamp module indicates the self-test and failure status of the ABS. The ABS 
warning lamp shall be on: 



During the initialization phase after IGN ON (continuously 3 seconds).  



In the event of inhibition of ABS functions by failure. 

 

2008 Kia Sedona 

2008 BRAKES ABS (Anti-Lock Brake System) - Sedona

  

Microsoft 

 

Saturday, May 22, 2010 6:52:41 PM

Page 3 

© 2006 Mitchell Repair Information Company, LLC. 



During diagnostic mode.  



When the ECU Connector is separated from ECU.  

2. PARKING/EBD 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 shall be on: 



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 separated from ECU.  

ABS CONTROL 

1. NORMAL BRAKING without ABS 

OPERATION CHART 

 

Inlet valve 
(EV)

Outlet valve 
(AV)

Pump motor

Operation

Open

Close

OFF

 

2008 Kia Sedona 

2008 BRAKES ABS (Anti-Lock Brake System) - Sedona

  

Microsoft 

 

Saturday, May 22, 2010 6:52:41 PM

Page 4 

© 2006 Mitchell Repair Information Company, LLC.