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Home >> Kia >> 2012 >> Optima Hybrid >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - HEV >> Engine Control Module (ECM) >> Repair procedures >> Removal
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Repair procedures: Removal

NOTE: When replacing the ECM, the vehicle equipped with immobilizer must be performed the procedure as below.
[In the case of installing used ECM]
  1. Perform "Neutral mode" procedure with GDS. (Refer to "IMMOBILIZER LAMP " in BE group)
  2. Insert the key and turn it to the IGN ON and OFF position.

Then the ECM key register process is completed automatically.
[In the case of installing new ECM]
  • Insert the key and turn it to the IGN ON and OFF position.

Then the ECM key register process is completed automatically.
  1. Shut off the High Voltage circuit. (Refer to HIGH VOLTAGE SHUTOFF PROCEDURE .
  2. Turn ignition switch OFF and disconnect the negative (-) battery cable.
  3. Disconnect the ECM Connector (A).
    Fig 1: Identifying ECM Connector
    G08312829Courtesy of KIA MOTORS AMERICA, INC.
  4. Remove the air cleaner assembly (Refer to REMOVAL AND INSTALLATION "Intake And Exhaust System" in EM group).
  5. Release the reservoir (A) after removing the bolts (B).
    6. Fig 2: Identifying Coolant Reservoir (A) And Mounting Bolts (B)
    G00529389Courtesy of KIA MOTORS AMERICA, INC.
  6. Disconnect the power cable (A) from the HPCU.
    1. Pull the lever (B) in the direction of the arrow with the hook (C) pressed.
    2. Press the lever (D), and then pull the power cable connector.
      3. Fig 3: Identifying Power Cable From The HPCU
      G00529390Courtesy of KIA MOTORS AMERICA, INC.
      Fig 4: Releasing Power Cable Connector
      G00529391Courtesy of KIA MOTORS AMERICA, INC.
  7. Remove the nut of the battery plus cable (A) in the engine room relay box.
  8. Disconnect the fixing clips (B) of the battery plus cable protector from the bracket.
    9. Fig 5: Identifying Battery Cable Plus Terminal Nut (A) and Fixing Clips On Protector
    G00529392Courtesy of KIA MOTORS AMERICA, INC.
  9. Pull the battery plus cable (A) toward the engine room to make space for the bracket bolt removal.
    10. Fig 6: Removing Battery Plus Cable Mounting Bolt
    G00529393Courtesy of KIA MOTORS AMERICA, INC.
  10. Remove the ECM bracket assembly (A) after removing the installation bolt (B) and nut (C).
Fig 7: Identifying ECM, Wiring And Mounting Bolts And Nut
G08312830Courtesy of KIA MOTORS AMERICA, INC.
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