Hyundai Accent (HC): Intelligent Variable Transmission (IVT) System (Continuously Variable Transmission) / Troubleshooting

- Troubleshooting

Limp Home Mode

Limp Home Mode features a fail-safe function that prevents dangerous situations in the event of a transmission failure. The vehicle will be driven in limp home mode if the transmission malfunctions. In this mode, the transmission operates at a minimal functionality level (fixed shifting, limited shifting, reverse, neutral), making it possible for the vehicle to reach a service center.

   

• Fail safe function : Prevents dangerous situations from developing in the event of a malfunction

• Limp home function : Maintains minimal functionality (Drive, Reverse, and Neutral) in the event of a malfunction, making it possible for the vehicle to reach a service center.

Troubleshooting
Trouble symptom Suspected areaRemedy
Poor shift qualityFaulty drive pulley speed sensorInspect the drive pulley speed sensor & connector
Faulty driven pulley speed sensorInspect the driven pulley speed sensor & connector
Faulty turbine speed sensorInspect the turbine speed sensor & connector
Faulty solenoid valveInspect the solenoid valve
Faulty CAN communicationInspect the CAN communication line & controller (TCM/ECM)
Faulty Transmission Control Module(TCM) software Inspect the TCM and replace it if necessary.
After replacement, input hydraulic characteristics and perform TCM adaptive value learning.
TCM learning not performedPerform the learning procedure again after deleting "IVT learning value"
Faulty E-module Inspect the E-module & connector
Poor hydraulic pressure controlInspect the transmission hydraulic pressure
Poor hydraulic pressure supplyCheck the fluid level
No oil characteristics input after replacement of TCM or Intelligent Variable Transmission (IVT)Input the hydraulic characteristics
Slipping in the IVT, Damaged clutch/brakeReplace the IVT
Faulty position switch Inspect the position switch & connector
Shifting shockTCM learning not performedPerform the learning procedure again after deleting "IVT learning value"
No hydraulic characteristics input after replacement of TCM or IVTPerform the TCM adaptive value learning after hydraulic characteristics input
Poor hydraulic pressure controlCheck the IVT hydraulic pressure
Poor hydraulic pressure supplyCheck the IVTF level
Improper installation of the IVTTighten the mounting bolt to the specified torque
Damaged driven/drive pulleys, clutch/brakeReplace the IVT
Abnormal noise from transmissionDamaged bearing/ parts stuck insideReplace the IVT
Low IVTF levelCheck the fluid level
IVT shifting disabledDamaged pulley chain beltReplace IVT
Damaged gear/clutch/brakeReplace IVT

Other information:

Hyundai Accent (HC) (2017 - 2022) Service Manual: Specifications

- Specification EngineTransaxleJoint type Max. permissible angle OuterInnerOuterInner GAMMA 1.6AT / MTBJ#22TJi#2246.5°23° - Tightening torque Item N.mkgf.mlb-ft FrontHub nuts107.9 - 127.511.0 - 13.079.6 - 94.0 Driveshaft caulking nut274.6 - 294.228.0 - 30.0202.5 - 217.0 Strut assembly to knuckle98.1 - 117.710.0 - 12.072.3 - 86.8 Front caliper to knuckle78.

Hyundai Accent (HC) (2017 - 2022) Service Manual: Repair procedures

- Removal     • Put on gloves to protect your hands.     • Use seat covers to avoid damaging any surfaces. 1.Remove the roof garnish.(Refer to Body Side Molding - "Roof Garnish") 2.Remove the rear pillar trim. (Refer to Interior Trim - "Rear Pillar Trim") 3.Spread the WD - 40 on the side of rear window glass.

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