Kia Optima Hybrid: Engine Electrical System / Troubleshooting
| Trouble Shooting |
| 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 |
| 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. |
| 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
...
Other information:
Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Components and Components Location
Components Location 1. Fuel Tank2. Fuel Pump3. Fuel Filter4. Fuel Pressure Regulator5. Canister6. Auxiliary Canister7. Fuel Tank Air Filter8. Fuel Tank Band9. Fuel Filler Hose10. Natural Vacuum Leakage Detection (NVLD)11. Fuel Level Sender (FLS)12. Ventilation Hose13. Vapor Tube14. Fuel Pump Plate Cover ...
Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: High Voltage Shut-off Procedures
High Voltage Shut-off Procedures Be sure to read and follow the “General Safety Information and Caution” before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries. • High voltage components: ...