Kia Optima Manuals

Kia Optima: Troubleshooting - Cruise Control System - Engine Electrical System - Kia Optima TF 2011-2026 Service ManualKia Optima: Troubleshooting

Trouble Symptom Charts

Trouble Symptom 1

Trouble Symptom 2

Trouble Symptom 2
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 ECM
 Check input and output signals at ECM

Trouble Symptom 3

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
 Repair the harness or replace the brake pedal switch
Malfunction of the ECM signals
 Check input and output signals at ECM

Trouble Symptom 4

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 ECM signals
 Check input and output signals at ECM

Trouble Symptom 5

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 ECM signals
 Check input and output signals at ECM

Trouble Symptom 6

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 ECM signals
 Check input and output signals at ECM

Trouble Symptom 7

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 ECM signals
 Check input and output signals at ECM

Trouble Symptom 8

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


Description and Operation
Cruise Control The cruise control system is engaged by the cruise "ON/OFF" main switch located on right of steering wheel column. The system has the capability to cruise, coast, accel ...

Cruise Control Switch. Schematic Diagrams
Circuit Diagram ...

See also:

Tire Size Designation
A tire’s sidewall is marked with a tire size designation. You will need this information when selecting replacement tires for your car. The following explains what the letters and numbers in the ...

System operation
Ventilation 1. Set the mode to the position. 2. Set the air intake control to the outside (fresh) air position. 3. Set the temperature control to the desired position. 4. Set the fan speed contr ...

Repair procedures
General Inspection After or before servicing the EPS system, perform the troubleshooting and test procedure as follows. Compare the system condition with normal condition in the table below and i ...

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