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Home >> Kia >> 2020 >> Optima Plug-In Hybrid EX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 56 (Hybrid Motor Control System (HEV)) >> Motor Control Unit (MCU) >> Repair Procedures >> Removal

Repair Procedures: Removal

WARNING: This page is about a different variant/trim than selected.
WARNING:
  • Be sure to read and follow the "GENERAL SAFETY INFORMATION & CAUTION " before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries.
  • Be sure to shut off the high voltage circuit according to the "HIGH VOLTAGE SHUT-OFF PROCEDURES " before doing any work related with the high voltage system to avoid serious electrical injuries.
NOTE: The MCU is integrated into the HPCU that can't be disassembled. So refer to "HPCU " for the removal or installation procedure of the MCU.
  1. Shut off the high voltage circuit.

    (Refer to Hybrid Motor System - "HIGH VOLTAGE SHUT-OFF PROCEDURE ")

  2. Drain the coolant of hybrid motor cooling system.

    (Refer to Hybrid Motor Cooling System - "COOLANT ")

  3. Remove the air duct and the air cleaner assembly.

    (Refer to Engine Mechanical System - "AIR CLEANER ")

  4. Remove the reservoir by loosening the bolts (B) after separating the hoses (A).

    Tightening torque: 

    3.9 - 5.9 N.m (0.4 - 0.6 kgf.m, 2.9 - 4.3 lb.ft)

    G13391604Courtesy of KIA MOTORS AMERICA, INC.
  5. Remove the HPCU cover (A).

    Tightening torque: 

    3.9 - 5.9 N.m (0.4 - 0.6 kgf.m, 2.9 - 4.3 lb.ft)

    G13391605Courtesy of KIA MOTORS AMERICA, INC.
  6. Disconnect the motor high voltage cable connector (A) and the HSG high voltage cable connector (B).
    G13391606Courtesy of KIA MOTORS AMERICA, INC.
  7. Disconnect the high voltage battery cable connector (A) and the inverter high voltage cable connector (B).
    G13391607Courtesy of KIA MOTORS AMERICA, INC.
  8. Disconnect the MCU connector (A).
    G13391608Courtesy of KIA MOTORS AMERICA, INC.
  9. Separate the coolant outlet hose (A).
  10. Disconnect the LDC power cable (B) and ground cable (C).

    Tightening torque 

    (B, C): 3.9 - 5.9 N.m (0.4 - 0.6 kgf.m, 2.9 - 4.3 lb.ft)

    G13391609Courtesy of KIA MOTORS AMERICA, INC.
  11. Remove the high voltage cable mounting bracket (A).

    Tightening torque: 

    3.9 - 5.9 N.m (0.4 - 0.6 kgf.m, 2.9 - 4.3 lb.ft)

    G13391610Courtesy of KIA MOTORS AMERICA, INC.
  12. Remove the HPCU assembly after loosening the bolts (A).

    Tightening torque: 

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

    G13391611Courtesy of KIA MOTORS AMERICA, INC.