Hyundai Sonata LF: Cruise Control System / Troubleshooting
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
| 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
| 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
| 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
| 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
| 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
| 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
|
System Block Diagram
Component Parts And Function Outline
Component partFunctionVehicle-speed sensor, ESP/ABS Control ModuleConverts vehicle speed to pulse...
Other information:
Removal
1.
Remove the air cleaner assembly and air duct.
(Refer to Engine Mechnical System - "Air cleaner")
2.
Remove the TCM.
(Refer to Dual Clutch Transmission Control System - "TCM")
3.
Remove the battery and tray.
(Refer to Engine Electrical System - "Battery")
4...
Inspection
Throttle Position Sensor (TPS)
1.
Connect the GDS on the Data Link Connector (DLC).
2.
Start the engine and measure the output voltage of TPS 1 and 2 at C.T. and W.O.T.
Specification: Refer to “Specification”
ETC Motor
1...
Schematic Diagrams
