Repair Procedures: Removal

Shut off the High Voltage circuit.
(Refer to High Voltage Shut-Off Procedures . )
Turn the ignition switch OFF and disconnect the auxiliary 12V negative (-) battery terminal.
Remove the air cleaner assembly.
(Refer to Engine & Transaxle Assembly (R & I) - Optima HEV )
Disconnect the ECM connector (A) and remove the engine room relay box (B).

Fig 1: Locating Engine Room Relay Box And ECM Connector
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Disconnect the battery positive (+) terminal (A).

Fig 2: Disconnecting Battery Positive (+) Terminal
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Remove the reservoir mounting bolt (A) and coolant outlet pipe mounting bolt (B).

Fig 3: Locating Reservoir Mounting Bolt And Coolant Outlet Pipe Mounting Bolt
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Make a gap for removing the ECM bracket mounting bolt (C) by moving the battery cable (A) and the reservoir (B) as shown in the illustration below and then remove the bolt (C).

Fig 4: Locating ECM Bracket Mounting Bolt, Battery Cable And Reservoir
Courtesy of KIA MOTORS AMERICA, INC.
Remove the ECM (C) by loosening the nut (A) and the bolt (B).

Fig 5: Locating ECM Bolt And Nut

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