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Home >> Kia >> 2012 >> Optima Hybrid >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Electronic Stability Control (ESC) System - HEV >> ESC Control Module >> Repair procedures >> Removal

Repair procedures: Removal

  1. Turn the ignition switch OFF and disconnect negative (-) battery cable.
  2. Remove the air duct (B) and air cleaner assembly (A).
    Fig 1: Identifying Air Duct And Air Cleaner Assembly
    G08308636Courtesy of KIA MOTORS AMERICA, INC.
  3. Remove the brake fluid from the master cylinder reservoir with a syringe.
    CAUTION:
    • 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.
    • 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.
  4. Remove the brake tubes (A).

    Tightening torque: 

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

    Fig 2: Identifying Brake Tubes
    G08308637Courtesy of KIA MOTORS AMERICA, INC.
  5. Disconnect the brake tubes (B) from the HECU by unlocking the nuts counterclockwise with a spanner.

    Tightening torque: 

    13.7 ~ 16.7 N.m (1.4 ~ 1.7 kgf.m, 10.1 ~ 12.3 lb-ft)

    Fig 3: Identifying Brake Tubes And HECU Connector
    G08308638Courtesy of KIA MOTORS AMERICA, INC.
  6. Pull up the lock of the HECU connector (C), and then disconnect the connector.
  7. Loosen the HECU bracket bolts (A) and nut (B), then remove HECU and bracket.

    Tightening torque: 

    Bolts (A):

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

    Nuts (B):

    8.8 ~ 13.7 N.m (0.9 ~ 1.4 kgf.m, 6.5 ~ 10.1 lb-ft)

    Fig 4: Identifying HECU Bracket Bolts And Nut
    G08308639Courtesy of KIA MOTORS AMERICA, INC.
    CAUTION:
    • Never attempt to disassemble the HECU.
    • Never shock the HECU.
  8. Remove the bolts, and 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)