Kia Optima Hybrid: Engine Electrical System / Troubleshooting

Trouble Shooting
Ignition System
Symptom
Suspect area
Remedy
Vehicle indicates Ready in dash, but engine will not run when requested by the HPCU (HEV module).
Ignition coil
Inspect ignition coil, or replace as required
Spark plugs
Inspect spark plugs, or replace as required
Ignition wiring disconnected or broken
Repair wiring, or replace as required
Rough idle
Ignition wiring
Repair wiring, or replace as required
Ignition coil
Inspect ignition coil, or replace as required
Engine hesitates/poor acceleration
Spark plugs and spark plug cables
Inspect spark plugs / cable, or replace as required
Ignition wiring
Repair wiring, or replace as required
Poor mileage
Spark plugs and spark plug cables
Inspect spark plugs / cable, or replace as required

Charging System
Symptom
Suspect area
Remedy
Charging warning indicator does not light with Start/Stop Button "ON" and Hybrid System off.
Fuse blown
Check fuses
Light burned out
Replace light
Wiring connection loose
Tighten loose connection
LDC problem
Check the LDC.
Refer to HC group
Charging warning indicator does not go out with Hybrid System on. (Battery requires frequent recharging)
Battery cable loose, corroded or worn
Inspect cable connection, repair or replace cable
LDC problem
Check the LDC.
Refer to HC group
Wiring
Repair or replace wiring
Overcharge
LDC problem
Check the LDC.
Refer to HC group
Voltage sensing wire
Repair or replace wiring
Discharge
Wiring connection loose or short circuit
Inspect wiring connection, repair or replace wiring
LDC problem
Check the LDC.
Refer to HC group
Poor grounding
Inspect ground or repair
Worn battery
Replace battery
Abnormal parasitic draw from the vehicle
Install a current probe to measure current. It should be less than 0.05A (50mA) after Hybrid System off and waiting 10 minutes. Make sure trunk light is removed for this test.

Starting System
Symptom
Suspect area
Remedy
Vehicle will not indicate Ready in dash at Hybrid System on.
Auxiliary 12V battery charge low
Charge or replace auxiliary 12V battery
Auxiliary 12V battery cables loose, corroded or worn out
Repair or replace cables
Transaxle range switch (Vehicle with automatic transaxle only)
Refer to AT group-automatic transaxle
Fuse blown
Replace fuse
Ignition switch faulty
Replace

Special Service Tools

Personal Protective Equipment NameIllustrationDescriptionInsulation gloveUsed when inspecting or working on the high voltage components[Insulation performance : 1000V / 300A or above]Insulation shoesUsed ...

Charging System

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Other information:

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Repair procedures


Inspection 1. After disconnecting the vapor hose from the PCV valve, remove the PCV valve. 2. Reconnect the PCV valve to the vapor hose. 3. Run the engine at idle, then put a finger over the open end of the PCV valve and make sure that intake manifold vacuum can be felt.     The plunger inside ...

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Cylinder Head Components and Components Location


Components 1. Camshaft bearing cap2. Camshaft front bearing cap3. Exhaust camshaft4. Intake camshaft5. Exhaust CVVT assembly6. Intake CVVT assembly7. Exhaust camshaft upper bearing8. Exhaust camshaft lower bearing9. MLA (Mechanical lash adjuster)10. Retainer lock11. Retainer 12. Valve spring13. Valve ...

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