Hyundai Sonata LF: Cruise Control System / Troubleshooting
| Trouble Symptom Charts |
| Trouble Symptom 1 |
| 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 |
Schematic Diagrams
System Block Diagram Component Parts And Function Outline Component partFunctionVehicle-speed sensor, ESP/ABS Control ModuleConverts vehicle speed to pulse...
Other information:
Hyundai Sonata LF 2014-2019 Service Manual: Rear Door Trim Repair procedures
Replacement • Put on gloves to protect your hands. • When prying with a flat-tip screwdriver or use a prying trim tool, wrap it with protective tape, and apply protective tape around the related parts, to prevent damage...
Hyundai Sonata LF 2014-2019 Service Manual: Fuel Pump Control Module (FPCM) Description and Operation
Description The fuel pump control module (FPCM) is installed on the right side of the fuel tank on the fuel pump top plate and controls the DC motor mounted inside the low pressure fuel pump. The module compares instantaneous fuel pressure information measured by the fuel pressure sensor (FPS) with target fuel pressure information provided by the ECM and generates the desired target fuel pressure by controlling the fuel pump motor and regulating fuel flow rate in the low pressure fuel line between the low and high pressure fuel pumps...
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