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: Description and Operation
Operation Function Of Safety Power Window When all door (Front, Rear) power window auto-up switch is operated, safety function is activated. 1. Safety function condition When detect the force of 100N during the window rising, window is reversed. 2. Length of window reversing (except holding the auto-up ...
Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Description and Operation
Description Tread Lamp – Tire Under Inflation / Leak Warning. 1. Turn on condition • When tire pressure is below allowed threshold • When rapid leak is detected by the sensor. 2. Turn off condition • When tire pressure is above(warning threshold + hysteresis). • When tire pressure is above ...