Kia Sedona (2008 year). Manual - part 381

Fig. 1: ESC Function Diagram 
Courtesy of KIA MOTORS AMERICA, INC. 

DESCRIPTION OF ESC CONTROL 

ESC system includes ABS/EBD, TCS and AYC (Active yaw control) function. 

ABS/EBD function The ECU changes the active sensor signal (current shift) coming from the four wheel 
sensors to the square waveform. 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, Steering Wheel Angle 
Sensor). If vehicle maneuver is unstable (Over Steer or Under Steer), AYC function applies the brake pressure 
on certain wheel, and send engine torque reduction signal by CAN. 

After the key-on, the ECU continually 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) 

 

2008 Kia Sedona 

2008 BRAKES ESP (Electronic Stability Program) - Sedona

  

Microsoft 

 

Saturday, May 22, 2010 6:53:50 PM

Page 2 

© 2006 Mitchell Repair Information Company, LLC. 

Fig. 2: ESC System Diagram
Courtesy of KIA MOTORS AMERICA, INC. 

VARIANT CODING 

The HECU is programmed with a variant code based on the vehicle powertrain configuration. This variant code 
is used to determine the appropriate ESC calculations. Variant code programming should be performed 
whenever an HECU is replaced. 

Fig. 3: Communication Diagram 
Courtesy of KIA MOTORS AMERICA, INC. 

PROCEDURE OF VARIANT CODING 

1. Install a PCM (ECM & TCM)/ESC normally.  

2. Connect the scan tool to the data link connector located underneath the dash panel.  

3. Select vehicle name.  

4. Select ANTI-LOCK BRAKE SYSTEM.  

5. Select the variant coding. 

 

2008 Kia Sedona 

2008 BRAKES ESP (Electronic Stability Program) - Sedona

  

Microsoft 

 

Saturday, May 22, 2010 6:53:50 PM

Page 3 

© 2006 Mitchell Repair Information Company, LLC. 

Fig. 4: Scan Tool Screen Display - 10 VARIANT CODING 
Courtesy of KIA MOTORS AMERICA, INC. 

6. Follow the next procedure according to the comment 

Fig. 5: Scan Tool Screen Display - 1.10 VARIANT CODING 
Courtesy of KIA MOTORS AMERICA, INC. 

7. Confirm the condition, and then push the "REST". 

 

2008 Kia Sedona 

2008 BRAKES ESP (Electronic Stability Program) - Sedona

  

Microsoft 

 

Saturday, May 22, 2010 6:53:50 PM

Page 4 

© 2006 Mitchell Repair Information Company, LLC. 

Fig. 6: Scan Tool Screen Display - VARIANT CODING CONDITION 
Courtesy of KIA MOTORS AMERICA, INC. 

8. If the procedure is finished, the screen is displayed as shown below. 

Fig. 7: Scan Tool Screen Display - CALIBRATION COMPLETION 
Courtesy of KIA MOTORS AMERICA, INC. 

9. IGN off.  

10. IGN on.  

11. The variant coding is completed. 

INPUT AND OUTPUT DIAGRAM 

CAUTION: If the warning lamp (ESC, EBD, ABS) is illuminated, follow the 

"Variant coding" again.

 

2008 Kia Sedona 

2008 BRAKES ESP (Electronic Stability Program) - Sedona

  

Microsoft 

 

Saturday, May 22, 2010 6:53:50 PM

Page 5 

© 2006 Mitchell Repair Information Company, LLC.