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
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Other information:
Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Wheel Repair procedures
Hub nut tightening sequence Tighten the hub nuts as follows. Tightening torque: 88.3 ~ 107.9N.m (9.0 ~ 11.0kgf.m, 65.1 ~ 79.6lb-ft) When using an impact gun, final tightening torque should be checked using a torque wrench. Run out inspection 1. Jack up the vehicle. 2. Measure the wheel ...
Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Blower Unit Repair procedures
Replacement 1. Disconnect the negative (-) battery terminal. 2. Remove the crash pad and heater blower unit. (Refer to HA group-heater unit) 3. Remove the heater blower unit from crash pad. (Refer to HA group - "Heater Unit") 4. Remove the blower unit (A) from the heater unit after loosening a mounting ...