Hyundai Accent (HC): Intelligent Variable Transmission (IVT) System (Continuously Variable Transmission) / Troubleshooting
Hyundai Accent (HC) (2017 - 2022) Service Manual / Intelligent Variable Transmission (IVT) System (Continuously Variable Transmission) / 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.
| Trouble symptom | Suspected area | Remedy |
| Poor shift quality | Faulty drive pulley speed sensor | Inspect the drive pulley speed sensor & connector |
| Faulty driven pulley speed sensor | Inspect the driven pulley speed sensor & connector | |
| Faulty turbine speed sensor | Inspect the turbine speed sensor & connector | |
| Faulty solenoid valve | Inspect the solenoid valve | |
| Faulty CAN communication | Inspect 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 performed | Perform the learning procedure again after deleting "IVT learning value" | |
| Faulty E-module | Inspect the E-module & connector | |
| Poor hydraulic pressure control | Inspect the transmission hydraulic pressure | |
| Poor hydraulic pressure supply | Check 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/brake | Replace the IVT | |
| Faulty position switch | Inspect the position switch & connector | |
| Shifting shock | TCM learning not performed | Perform the learning procedure again after deleting "IVT learning value" |
| No hydraulic characteristics input after replacement of TCM or IVT | Perform the TCM adaptive value learning after hydraulic characteristics input | |
| Poor hydraulic pressure control | Check the IVT hydraulic pressure | |
| Poor hydraulic pressure supply | Check the IVTF level | |
| Improper installation of the IVT | Tighten the mounting bolt to the specified torque | |
| Damaged driven/drive pulleys, clutch/brake | Replace the IVT | |
| Abnormal noise from transmission | Damaged bearing/ parts stuck inside | Replace the IVT |
| Low IVTF level | Check the fluid level | |
| IVT shifting disabled | Damaged pulley chain belt | Replace IVT |
| Damaged gear/clutch/brake | Replace IVT |
Other information:
Hyundai Accent (HC) (2017 - 2022) Service Manual: E-Module
- Specifications Drive Pulley Speed Sensor ItemSpecification TypeHall sensor Output voltage (V)High : 1.18 - 1.68 (Nor : 1.4) Low : 0.59 - 0.84 (Nor : 0.7) Turbine Speed Sensor ItemSpecification TypeHall sensor Output voltage (V)High : 1.18 - 1.68 (Nor : 1.4) Low : 0.59 - 0.84 (Nor : 0.7) Oil Temperature Sensor ItemSpecification Type*NTC thermistor Temp.Hyundai Accent (HC) (2017 - 2022) Service Manual: Engine Oil
- Replacement • Prolonged and repeated contact with mineral oil will result in the removal of natural fats from the skin, leading to dryness, irritation and dermatitis. In addition, used engine oil contains potentially harmful contaminants which may cause skin cancer. • Exercise caution in order to minimize the length and frequency of contact of your skin to used oil.
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