Hyundai i-30: Suspension System (NON-ECS) / Troubleshooting

Hyundai i30 (PD) 2018-2025 Service Manual / Suspension System (NON-ECS) / 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 and 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 or replace Replace
Wandering	Improper front wheel alignment Poor turning resistance of lower arm ball joint Loose or worn lower arm bushing	Correct Repair 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
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 Replace Replace
Bottoming	Broken or worn coil spring Malfunctioning shock absorber	Replace 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) Illustration Use 09568-1S100 Saperate the ball joint from the front alxe 09546-3X100 Shock absorber lock nut removal tool Used for remove the shock absorber lock nut...

Front Suspension System

Other information:

Hyundai i30 (PD) 2018-2025 Service Manual: Start/Stop Button

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Hyundai i30 (PD) 2018-2025 Service Manual: Smart Key Unit

Components and components location Components No Connector A Connector B Connector C 1 - IGN 2 Relay output Battery signal 2 SSB Switch 1 input C CAN (Low) - 3 Driver door antenna switch input C CAN (High) Immoblizer antenna power 4 - B CAN (High) Driver out side handle antenna power 5 - B CAN (Low) Assist out side handle antenna power 6 - SSB Illumination (orange) Bumper antenna power 7 RPM Input - Interior antenna 1 power 8 Start signal feedback input SSB Illumination (+) output Interior antenna 2 power 9 clutch switch input ESCL enable output Interior antenna 3 power 10 - Battery power - 11 Starter relay output IGN 1 Relay output - 12 Power 1 ESCL COM - 13 SSB Switch 2 input EMS COM ESCL (-) output 14 Assist door antenna switch input - Immoblizer antenna ground 15 - SSB Illumination (-) output Driver out side handle antenna ground 16 Clutch switch input SSB LED Output Assist out side handle antenna ground 17 ESCL unlock swtich input SSB LED IGN Output Bumper antenna ground 18 Wheel speed sensor input External buzzer Interior antenna 1 ground 19 ACC Input - Interior antenna 2 ground 20 IGN 1 ESCL (+) output Interior antenna 3 ground 21 Brake switch input - 22 ACC Relay input GND Power 2 Schematic diagrams Circuit Diagram Repair procedures Removal Smart Key Unit 1...