Kia Sorento: ESC Control Unit Repair procedures

Kia Sorento (MQ4, 2021-2026) Service Manual / Brake System / Electronic Stability Control (ESC) / ESC Control Unit Repair procedures

Removal

1.	Disconnect the (-) battery terminal.

2.	Pull up the lock of the ESC control unit (HECU) connector and then disconnect the connector (A).

Separate the brake tube by removing the flare nuts connected to the ESC control unit (HECU).

Tightening torque

Nuts (A) : 13.7 - 16.7 N·m (1.4 - 1.7 kgf·m, 10.1 - 12.3 lb·ft)

Nuts (B) : 18.6 - 22.6 N·m (1.9 - 2.3 kgf·m, 13.7 - 16.6 lb·ft)

Brake System — Electronic Stability Control (ESC) / ESC Control Unit / Repair procedures / Removal illustration

Remove the bracket mounting nuts and remove the ESC control unit (HECU) (A) from the vehicle.

Tightening torque :

16.7 - 25.5 N·m (1.7 - 2.6 kgf·m, 12.3 - 18.8 lb·ft)

Brake System — Electronic Stability Control (ESC) / ESC Control Unit / Repair procedures / Removal illustration

Do not drop to impact the ESC control unit (HECU).

5.	Remove the bolts to remove the bracket (B) from the ESC control unit (HECU) (A).

Installation

1.	Install in the reverse order of removal.

2.	After installation, bleed the brake system. (Refer to Brake system - "Brake Bleeding Procedures")

3.	Conduct the Variant Coding.

4.	Conduct the Auto Detected Sensor Calibration.

5.	Conduct the Longitudinal G Sensor Calibration.

6.	After replacing the ESC control unit execute the "Assembly Check (ECU replacement)" of the additional function to check that the mounting is successful.

Diagnostic procedure by using diagnostic scan tool

Perform diagnostic procedure by using diagnostic device as shown below:

Connect self-diagnosis connector (16pins) located under the driver side crash pad to self-diagnosis device, and then turn the self-diagnosis device after key is ON.

Select the "vehicle model" and "Brake" on KDS vehicle selection screen, then select OK.

[Variant Coding]

Brake System — Electronic Stability Control (ESC) / ESC Control Unit / Repair procedures / Diagnostic procedure by using diagnostic scan tool illustration

[Auto Detected Configuration]

Brake System — Electronic Stability Control (ESC) / ESC Control Unit / Repair procedures / Diagnostic procedure by using diagnostic scan tool illustration

[Longitudinal G Sensor Calibration]

Brake System — Electronic Stability Control (ESC) / ESC Control Unit / Repair procedures / Diagnostic procedure by using diagnostic scan tool illustration

[Assembly Check]

Brake System — Electronic Stability Control (ESC) / ESC Control Unit / Repair procedures / Diagnostic procedure by using diagnostic scan tool illustration

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Kia Sorento: ESC Control Unit Repair procedures

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