Kia Optima Hybrid: Cruise Control System / Troubleshooting
| Trouble Symptom Charts |
| Trouble Symptom 1 |
| Trouble symptom | Probable cause | Remedy |
| The set vehicle speed varies greatly upward or downward "Surging" (repeated alternating acceleration and deceleration) occurs after setting | Malfunction of the vehicle speed sensor circuit | Repair the vehicle speed sensor system, or replace the part |
| Malfunction of brake system | Check input and output signals at brake system |
| Trouble symptom | Probable cause | Remedy |
| The CC system is not canceled when the brake pedal is depressed | Damaged or disconnected wiring of the brake pedal switch or malfunction of the brake stroke sensor or circuit | Repair the harness or replace the brake pedal switch |
| Malfunction of the brake signals or brake system | Check input and output signals at HCU or brake system |
| Trouble symptom | Probable cause | Remedy |
| The
CC system is not canceled when the shift lever is moved to the "N"
position (It is canceled, however, when the brake pedal is depressed) | Damaged or disconnected wiring of inhibitor switch input circuit | Repair the harness or repair or replace the inhibitor switch |
| Improper adjustment of inhibitor switch | ||
| Malfunction of the TCU signals | Check input and output signals at TCU |
| Trouble symptom | Probable cause | Remedy |
| Cannot decelerate (coast) by using the "SET/–" switch | Temporary damaged or disconnected wiring of "SET/–" switch input circuit | Repair the harness or replace the "SET/–" switch |
| Malfunction of the cluster signals | Check input and output signals at cluster |
| Trouble symptom | Probable cause | Remedy |
| Cannot accelerate or resume speed by using the "RES/+" switch | Damaged or disconnected wiring, or short circuit, or "RES/+" switch input circuit | Repair the harness or replace the "RES/+" switch |
| Malfunction of the cluster signals | Check input and output signals at cluster |
| Trouble symptom | Probable cause | Remedy |
| CC
system can be set while driving at a vehicle speed of less than 40km/h
(25mph), or there is no automatic cancellation at that speed | Malfunction of the vehicle-speed sensor circuit | Repair the vehicle speed sensor system, or replace the part |
| Malfunction of the brake system | Check input and output signals at brake system |
| Trouble symptom | Probable cause | Remedy |
| The cruise main switch indicator lamp does not illuminate (But CC system is normal) | Damaged or disconnected bulb of cruise main switch indicator lamp | Repair the harness or replace the part. |
| Harness damaged or disconnected |
Schematic Diagrams
System Block Diagram Component Parts And Function Outline Component partFunctionECUControls engine.MCUControls drive motor.ABSSends vehicle speed to HCU.HCUReceives signals from sensor and control switches.Cluster ...
Cruise Control Switch Schematic Diagrams
Circuit Diagram ...
Other information:
Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Brake Line Repair procedures
Removal 1. Disconnect the brake fiuid level switch connector, and remove the reservoir cap. 2. Remove the brake fluid from the master cylinder reservior with a syringe. Do not spill brake fluid on the vehicle, it may damage the paint; if brake fluid does contact the paint, wash it off immediately ...
Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Accelerator Position Sensor (APS) Description and Operation
Description Accelerator Position Sensor (APS) is installed on the accelerator pedal module and detects the rotation angle of the accelerator pedal. The APS is one of the most important sensors in engine control system, so it consists of the two sensors which adapt individual sensor power and ground line. ...