Hyundai Sonata: General Information / Troubleshooting

Hyundai Sonata LF 2014-2019 Service Manual / Suspension System / General Information / Troubleshooting

Troubleshooting

Symptom	Possible cause	Remedy
Hard steering	Improper front wheel alignment Excessive turning resistance of lower arm ball joint Low tire pressure No power assist	Correct Replace Adjust Repair or replace
Poor return of steering wheel to center	Improper front wheel alignment	Correct
Poor or rough ride	Improper front wheel alignment Malfunctioning shock absorber Broken or worn stabilizer Broken or worn coil spring Worn lower arm bushing	Correct Repair or replace Replace Replace Replace the lower arm assembly
Abnormal tire wear	Improper front wheel alignment Improper tire pressure Malfunctioning shock absorber	Correct Adjust Repair or replace
Wandering	Improper front wheel alignment Poor turning resistance of lower arm ball joint Loose or worn lower arm bushing	Correct Replace Retighten or replace
Vehicle pulls to one side	Improper front wheel alignment Excessive turning resistance of lower arm ball joint Broken or worn coil spring Bent lower arm	Correct Replace Replace Repair or replace
Steering wheel shimmy	Improper front wheel alignment Poor turning resistance of lower arm ball joint Broken or worn stabilizer Worn lower arm bushing Malfunctioning shock absorber Broken or worn coil spring	Correct Replace Replace Replace Repair or replace Replace
Bottoming	Broken or worn coil spring Malfunctioning shock absorber	Replace Repair or replace

Wheel /tire noise, vibration and harshness concerns are directly related to vehicle speed and are not generally affected by acceleration, coasting or decelerating. Also, out-of-balance wheel and tires can vibrate at more than one speed. A vibration that is affected by the engine rpm, or is eliminated by placing the transmission in Neutral is not related to the tire and wheel. As a general rule, tire and wheel vibrations felt in the steering wheel are related to the front tire and wheel assemblies. Vibrations felt in the seat or floor are related to the rear tire and wheel assemblies. This can initially isolate a concern to the front or rear.

Careful attention must be paid to the tire and wheels. There are several symptoms that can be caused by damaged or worn tire and wheels. Perform a careful visual inspection of the tires and wheel assemblies. Spin the tires slowly and watch for signs of lateral or radial runout. Refer to the tire wear chart to determine the tire wear conditions and actions

Wheel and tire diagnosis

Rapid wear at the center

Rapid wear at both shoulders

Wear at one shoulder

•	Center-tread down to fabric due to excessive over inflated tires

•	Lack of rotation

•	Excessive toe on drive wheels

•	Heavy acceleration on drive

•	Under-inflated tires

•	Worn suspension components

•	Excessive cornering speeds

•	Lack of rotation

•	Toe adjustment out of specification

•	Camber out of specification

•	Damaged strut

•	Damaged lower arm

Partial wear

Feathered edge

Wear pattern

•	Caused by irregular burrs on brake drums

•	Toe adjustment out of specification

•	Damaged or worn tie rods

•	Damaged knuckle

•	Excessive toe on non-drive wheels

•	Lack of rotation

Special Service Tools

Special Service Tools Tool (Number and Name)IllustrationUse09546-26000Strut spring compressorCompression of coil spring ...

Front Suspension System

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Other information:

Hyundai Sonata LF 2014-2019 Service Manual: Transmission Gear Oil Repair procedures
Inspection • In principle, the transmission oil is maintenance-free, and no exchange is required. But it must be inspected and replenished every 4 years or 40,000 miles. 1. Park the vehicle on flat ground and turn off the engine. 2. Remove the under cover. ...

Hyundai Sonata LF 2014-2019 Service Manual: Fuel Pump Control Module (FPCM) Schematic Diagrams
Circuit Diagram Fuel Pressure Control Module (FPCM) Terminal And Input/Output signal FPCM Terminal Function Pin No.DescriptionConnected to1Fuel sender ground Fuel Pump 2Fuel pressure sensor (FPS) signal input Fuel Pressure Sensor (FPS) 3CAN [High] ?ECM 4Fuel pressure sensor (FPS) power supply ( ...