Kia Optima: Removal - ESC Control Module. Repair procedures - ESC(Electronic Stability Control) System - Brake System - Kia Optima TF 2011-2021 Service ManualKia Optima: Removal

1. Turn the ignition switch OFF.
2. Remove the air duct (B) and air cleaner assembly (A).

3. Remove the ECM connector (B) and the arrange the wiring harness (A).

4. Pull up the lock of the HECU connector (A) , then disconnect the connector.

5. Remove the brake fluid from the master cylinder reservoir with a syringe.
Х Be sure to completely remove foreign substances from around brake fluid reservoir and cap before opening the reservoir cap. If not, it may cause contamination of brake fluid and deterioration in braking performance.
Х Do not spill brake fluid on the vehicle, it may damage the paint; if brake fluid does contact the paint, wash it off immediately with water.
6. Disconnect the brake tubes from the HECU by unlocking the nuts counterclockwise with a spanner.

Tightening torque:

M10: 11.7 ~ 15.7 N.m (1.2 ~ 1.6 kgf.m, 8.7 ~ 11.6 lb-ft)

M12: 18.6 ~ 22.6 N.m (1.9 ~ 2.3 kgf.m, 13.7 ~ 16.6 lb-ft)

7. Loosen the HECU bracket bolts (A), then remove HECU and bracket.

Tightening torque :

19.6 ~ 29.4 N.m(2.0 ~ 3.0 kgf.m, 14.5 ~ 21.7 lb-ft)


1. Never attempt to disassemble the HECU.
2. Never shock the HECU.
8. Remove the 2 nuts (B), then remove the bracket from HECU.

Tightening torque :

10.8 ~ 13.7 N.m (1.1 ~ 1.4 kgf.m, 8.0 ~ 10.1 lb-ft)



ESC Control Module. Repair procedures
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Installation
1. Installation is the reverse of removal. 2. Tighten the HECU mounting bolts and nuts to the specified torque. 3. After installation, bleed the b ...

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Disassembly
If the disassembly procedure is complex, requiring many parts to be disassembled, all parts should be disassembled in a way that will not affect their performance or external appearance. 1. ...

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