Kia Optima: 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 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:
Antenna Coil. Repair procedures
Replacement
1.
Disconnect the negative (-) battery
terminal.
2.
Remove the steering column upper
and lower shrouds after loosening the screws (3EA).
...
Inspection
1.
Check the bushing for wear and
deterioration.
2.
Check the rear lower arm for
deformation.
3.
Check the coil spring and spring
pad for deterior ...
Changing the Manual Transaxle Oil
1. Raise and suitably support the vehicle.
2. Remove the drain plug on the bottom of the transaxle.
3. After the oil has drained completely, install a new washer on the plug, reinstall
the drain p ...